0001564590-20-007371 | 10-K | XBRL Viewer

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Document and Entity Information - USD ($) $ in Millions	12 Months Ended
Document and Entity Information - USD ($) $ in Millions	Dec. 31, 2019	Feb. 21, 2020	Jun. 30, 2019
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Entity Registrant Name	BlackLine, Inc.
Entity Central Index Key	0001666134
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Interactive Data Current	Yes
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Well-known Seasoned Issuer	Yes
Entity Public Float			$ 2,408
Entity Common Stock, Shares Outstanding		56,300,027
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	BL
Security Exchange Name	NASDAQ
Entity File Number	001-37924
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	46-3354276
Entity Address, Address Line One	21300 Victory Boulevard
Entity Address, Address Line Two	12th Floor
Entity Address, City or Town	Woodland Hills
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	91367
City Area Code	818
Local Phone Number	223-9008
Document Annual Report	true
Document Transition Report	false
Documents Incorporated by Reference	DOCUMENTS INCORPORATED BY REFERENCE Portions of the information called for by Part III of this Annual Report on Form 10-K where indicated are hereby incorporated by reference from the Definitive Proxy Statement for the registrant’s Annual Meeting of Stockholders to be held in 2020, which will be filed with the Securities and Exchange Commission not later than 120 days after the end of the registrant’s fiscal year ended December 31, 2019.

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 120,232	$ 46,181
Marketable securities	487,515	86,396
Accounts receivable, net of allowances for doubtful accounts of $237 and $46 at December 31, 2019 and 2018, respectively	102,829	74,902
Prepaid expenses and other current assets	12,830	14,042
Total current assets	723,406	221,521
Capitalized software development costs, net	10,032	9,023
Property and equipment, net	13,024	13,536
Intangible assets, net	17,520	27,785
Goodwill	185,138	185,138
Operating lease right-of-use assets	12,549
Other assets	52,883	36,478
Total assets	1,014,552	493,481
Current liabilities:
Accounts payable	7,401	3,442
Accrued expenses and other current liabilities	30,098	24,479
Deferred revenue	162,552	129,074
Short-term portion of operating lease liabilities	4,938
Short-term portion of contingent consideration	2,008	2,008
Total current liabilities	206,997	159,003
Operating lease liabilities, noncurrent	10,606
Convertible senior notes, net	384,343
Contingent consideration	4,354	4,308
Deferred tax liabilities, net	4,571	3,257
Deferred revenue, noncurrent	163	277
Other long-term liabilities		2,982
Total liabilities	611,034	169,827
Commitments and contingencies (Note 14)
Redeemable non-controlling interest (Note 4)	4,905	4,387
Stockholders' equity:
Preferred stock, $0.01 par value, 50,000,000 shares authorized, no shares issued and outstanding at December 31, 2019 and 2018
Common stock, $0.01 par value, 500,000,000 shares authorized, 55,930,994 issued and outstanding at December 31, 2019 and 54,682,647 issued and outstanding at December 31, 2018	559	547
Additional paid-in capital	561,275	451,571
Accumulated other comprehensive income	377	45
Accumulated deficit	(163,598)	(132,896)
Total stockholders' equity	398,613	319,267
Total liabilities, redeemable non-controlling interest, and stockholders' equity	$ 1,014,552	$ 493,481

CONSOLIDATED BALANCE SHEETS (PARENTHETICAL) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Statement Of Financial Position [Abstract]
Allowances for doubtful accounts	$ 237	$ 46
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	50,000,000	50,000,000
Preferred stock, shares Issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	55,930,994	54,682,647
Common stock, shares outstanding	55,930,994	54,682,647

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues
Total revenues	$ 288,976	$ 227,788	$ 175,603
Cost of revenues
Total cost of revenues	58,975	50,874	41,385
Gross profit	230,001	176,914	134,218
Operating expenses
Sales and marketing	158,837	128,808	103,967
Research and development	43,006	30,754	23,874
General and administrative	56,057	47,188	36,786
Total operating expenses	257,900	206,750	164,627
Loss from operations	(27,899)	(29,836)	(30,409)
Other income (expense)
Interest income	6,128	2,136	1,069
Interest expense	(8,650)	(4)	(13)
Change in fair value of the common stock warrant liability			(3,490)
Other income (expense), net	(2,522)	2,132	(2,434)
Loss before income taxes	(30,421)	(27,704)	(32,843)
Provision for income taxes	1,725	1,072	565
Net loss	(32,146)	(28,776)	(33,408)
Net loss attributable to non-controlling interest (note 4)	(1,444)	(62)
Adjustment attributable to non-controlling interest (note 4)	1,833
Net loss attributable to BlackLine, Inc.	$ (32,535)	$ (28,714)	$ (33,408)
Basic net loss per share attributable to BlackLine, Inc.	$ (0.59)	$ (0.53)	$ (0.64)
Shares used to calculate basic net loss per share	55,320	53,912	52,161
Diluted net loss per share attributable to BlackLine, Inc.	$ (0.59)	$ (0.53)	$ (0.64)
Shares used to calculate diluted net loss per share	55,320	53,912	52,161
Subscription and Support
Revenues
Total revenues	$ 272,447	$ 217,406	$ 167,081
Cost of revenues
Total cost of revenues	44,968	41,428	33,530
Professional Services
Revenues
Total revenues	16,529	10,382	8,522
Cost of revenues
Total cost of revenues	$ 14,007	$ 9,446	$ 7,855

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (32,146)	$ (28,776)	$ (33,408)
Other comprehensive income (loss):
Net change in unrealized gains (losses) on marketable securities, net of tax of $0 for the years ended December 31, 2019, 2018 and 2017	200	(26)	(22)
Foreign currency translation	261	266
Other comprehensive income (loss)	461	240	(22)
Comprehensive loss	(31,685)	(28,536)	(33,430)
Less comprehensive income (loss) attributable to redeemable non-controlling interest:
Net loss attributable to redeemable non-controlling interest	(1,444)	(62)
Foreign currency translation attributable to redeemable non-controlling interest	129	132
Comprehensive loss attributable to redeemable non-controlling interest	(1,315)	70
Comprehensive loss attributable to BlackLine, Inc.	$ (30,370)	$ (28,606)	$ (33,430)

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (PARENTHETICAL) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net change in unrealized gain on marketable securities, tax	$ 0	$ 0	$ 0

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Adjustment for change in accounting policy for stock option forfeitures			$ 72		$ (72)
Adjusted Balance	$ 308,042	$ 513	378,344	$ (41)	(70,774)
Beginning Balance at Dec. 31, 2016	308,042	$ 513	378,272	(41)	(70,702)
Beginning Balance, shares at Dec. 31, 2016		51,278
Net exercise of stock warrants	14,870	$ 4	14,866
Net exercise of stock warrants, shares		428
Stock option exercises	10,252	$ 13	10,239
Stock option exercises, shares		1,277
Stock-based compensation	16,179		16,179
Other comprehensive income (loss)	(22)			(22)
Net loss attributable to BlackLine, Inc.	(33,408)				(33,408)
Ending Balance at Dec. 31, 2017	315,913	$ 530	419,628	(63)	(104,182)
Ending Balance, shares at Dec. 31, 2017		52,983
Stock option exercises	14,004	$ 17	13,987
Stock option exercises, shares		1,698
Vesting of restricted stock units, shares		2
Acquisition of common stock for tax withholding obligations	(3,356)		(3,356)
Stock-based compensation	21,312		21,312
Other comprehensive income (loss)	108			108
Net loss attributable to BlackLine, Inc.	(28,714)				(28,714)
Ending Balance at Dec. 31, 2018	319,267	$ 547	451,571	45	(132,896)
Ending Balance, shares at Dec. 31, 2018		54,683
Stock option exercises	10,566	$ 5	10,561
Stock option exercises, shares		691
Vesting of restricted stock units	5	$ 5
Vesting of restricted stock units, shares		406
Issuance of common stock through employee stock purchase plan	5,295	$ 2	5,293
Issuance of common stock through employee stock purchase plan, shares		151
Acquisition of common stock for tax withholding obligations	(3,940)		(3,940)
Stock-based compensation	34,543		34,543
Other comprehensive income (loss)	332			332
Equity component of convertible senior notes, net of issuance costs	111,230		111,230
Purchase of capped calls	(46,150)		(46,150)
Net loss attributable to BlackLine, Inc.	(32,535)		(1,833)		(30,702)
Ending Balance at Dec. 31, 2019	$ 398,613	$ 559	$ 561,275	$ 377	$ (163,598)
Ending Balance, shares at Dec. 31, 2019		55,931

CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Thousands	12 Months Ended
CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Thousands	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Cash flows from operating activities
Net loss attributable to BlackLine, Inc.	$ (32,535)	$ (28,714)	$ (33,408)
Net loss and adjustment attributable to redeemable non-controlling interest (Note 4)	389	(62)
Net loss	(32,146)	(28,776)	(33,408)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	21,274	22,336	19,971
Change in fair value of common stock warrant liability			3,490
Change in fair value of contingent consideration	46	450	628
Amortization of debt discount and issuance costs	8,410
Stock-based compensation	34,052	20,895	16,044
Noncash lease expense	5,013
(Accretion) amortization of purchase discounts/premiums on marketable securities, net	(2,161)	(928)	37
Net foreign currency losses	65	420
Deferred income taxes	1,314	213	85
Provision for (benefit from) doubtful accounts receivable	157	(84)	565
Changes in operating assets and liabilities:
Accounts receivable	(27,962)	(13,207)	(20,189)
Prepaid expenses and other current assets	1,224	(449)	(2,035)
Other assets	(16,429)	(9,475)	(7,176)
Accounts payable	3,244	(4,008)	(25)
Accrued expenses and other current liabilities	5,789	4,191	2,120
Deferred revenue	33,364	24,699	26,504
Operating lease liabilities	(5,530)
Other long-term liabilities		(137)	(187)
Net cash provided by operating activities	29,724	16,140	6,424
Cash flows from investing activities
Purchases of marketable securities	(565,675)	(122,530)	(76,610)
Proceeds from maturities of marketable securities	149,638	111,394	78,205
Proceeds from sales of marketable securities	17,279	7,118
Capitalized software development costs	(5,060)	(5,675)	(4,624)
Purchases of property and equipment	(4,632)	(6,284)	(4,002)
Net cash used in investing activities	(408,450)	(15,977)	(7,031)
Cash flows from financing activities
Investment from redeemable non-controlling interest		4,317
Proceeds from issuance of convertible senior notes, net of issuance costs	487,163
Purchase of capped calls related to convertible senior notes	(46,150)
Proceeds from exercises of stock options	10,571	14,004	10,252
Proceeds from employee stock purchase plan	5,295
Acquisition of common stock for tax withholding obligations	(3,940)	(3,356)
Payments of initial public offering costs			(110)
Principal payments on capital lease obligations		(443)	(549)
Financed purchases of property and equipment	(427)
Net cash provided by financing activities	452,512	14,522	9,593
Effect of foreign currency exchange rate changes on cash, cash equivalents, and restricted cash	261	266
Net increase in cash, cash equivalents, and restricted cash	74,047	14,951	8,986
Cash, cash equivalents, and restricted cash, beginning of period	46,455	31,504	22,518
Cash, cash equivalents, and restricted cash, end of period	120,502	46,455	31,504
Reconciliation of cash, cash equivalents, and restricted cash to the consolidated balance sheets
Cash and cash equivalents at end of period	120,232	46,181	31,104
Restricted cash included within prepaid expenses and other current assets at end of period	20		400
Restricted cash included within other assets at end of period	250	274
Total cash, cash equivalents, and restricted cash at end of period shown in the consolidated statements of cash flows	120,502	46,455	31,504
Supplemental disclosures of cash flow information
Cash paid for interest			8
Cash paid for income taxes	1,007	591	868
Non-cash financing and investing activities
Stock-based compensation capitalized for software development	491	417	135
Net exercise of stock warrants			14,870
Capitalized software development costs included in accounts payable and accrued expenses and other current liabilities at end of period	560	359	331
Purchases of property and equipment included in accounts payable and accrued expenses and other current liabilities at end of period	863	$ 168	293
Leasehold improvements paid directly by landlord			$ 1,176
Leased assets obtained in exchange for new operating lease liabilities	$ 2,699

The Company

12 Months Ended

Dec. 31, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

The Company

Note 1—The Company

BlackLine, Inc. and its subsidiaries (the “Company” or “BlackLine”) provide financial accounting close solutions delivered primarily as Software as a Service (“SaaS”). The Company’s solutions enable its customers to address various aspects of their financial close process including account reconciliations, variance analysis of account balances, journal entry capabilities, and certain types of data matching capabilities.

The Company is a holding company and conducts its operations through its wholly-owned subsidiary, BlackLine Systems, Inc. (“BlackLine Systems”). BlackLine Systems funded its business with investments from its founder and cash flows from operations until September 3, 2013, when the Company acquired BlackLine Systems, and Silver Lake Sumeru and Iconiq acquired a controlling interest in the Company, which is referred to as the “2013 Acquisition.”

On August 31, 2016 the Company acquired Runbook Company B.V. (“Runbook”), which is referred to as the “Runbook Acquisition.”

The Company is headquartered in Woodland Hills, California and has offices in the Netherlands, Canada, France, Singapore, the United Kingdom, Germany, Australia, Hong Kong, Romania, and Poland.

Significant Accounting Policies

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Significant Accounting Policies

Note 2—Significant Accounting Policies

Principles of consolidation and basis of presentation

The Company’s consolidated financial statements are presented in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and include the operating results of its wholly-owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation.

Revision of Previously-Issued Financial Statements

In connection with the preparation of its 2019 annual financial statements, the Company identified an error in its historical provision for income taxes, which resulted in an understatement of its tax provision and deferred tax liabilities in its previously-issued financial statements. The error resulted from the recognition of a foreign deferred tax asset that should not have been recognized for the difference in international entity income for statutory purposes and international entity income included on the consolidated income tax provision. There was no corresponding domestic benefit of this incremental foreign tax expense due to the U.S. entity being subject to a full valuation allowance.

The Company evaluated the effect of these errors on prior periods under the guidance of SEC Staff Accounting Bulletin (“SAB”) No. 99, Materiality, and determined the amounts were not material to previously-issued financial statements. The Company also evaluated the effect of correcting these errors through a cumulative adjustment to the financial statements and concluded, based on the guidance within SAB No. 108, Considering the Effects of Prior Year Misstatements when Quantifying Misstatements in Current Year Financial Statements, it was appropriate to revise the previously-issued financial statements to correct these errors. As a result, the Company has revised the accompanying 2018 and 2017 consolidated financial statements. All relevant footnotes have also been adjusted to reflect the impact of the revision for this tax error, as well as certain prior period immaterial disclosure errors. See also Note 19, “Unaudited Quarterly Data”, for the impact of such errors on the unaudited quarterly financial data.

The following tables present the effect of the revision for the financial statement line items adjusted in the affected periods, including the $1.0 million adjustment to accumulated deficit at January 1, 2017 to correct for those tax errors that originated prior to 2017.

Consolidated Balance Sheet
	December 31, 2018
	As Previously Reported			Adjustments			As Revised
	(in thousands)
Other assets	$	36,865		$	(387	)	$	36,478
Total assets	$	493,868		$	(387	)	$	493,481
Accrued expenses and other current liabilities	$	24,705		$	(226	)	$	24,479
Total current liabilities	$	159,229		$	(226	)	$	159,003
Deferred tax liabilities, net	$	1,116		$	2,141		$	3,257
Total liabilities	$	167,912		$	1,915		$	169,827
Accumulated deficit	$	(130,594	)	$	(2,302	)	$	(132,896	)
Total stockholders' equity	$	321,569		$	(2,302	)	$	319,267
Total liabilities and stockholders' equity	$	493,868		$	(387	)	$	493,481

Consolidated Statements of Operations
	Year Ended December 31, 2018
	As Previously Reported			Adjustments			As Revised
	(in thousands, except per share data)
Provision for income taxes	$	162		$	910		$	1,072
Net loss	$	(27,866	)	$	(910	)	$	(28,776	)
Net loss attributable to BlackLine, Inc.	$	(27,804	)	$	(910	)	$	(28,714	)
Basic net loss per share attributable to BlackLine, Inc.	$	(0.52	)	$	(0.01	)	$	(0.53	)
Diluted net loss per share attributable to BlackLine, Inc.	$	(0.52	)	$	(0.01	)	$	(0.53	)

	Year Ended December 31, 2017
	As Previously Reported			Adjustments			As Revised
	(in thousands, except per share data)
Provision for income taxes	$	208		$	357		$	565
Net loss	$	(33,051	)	$	(357	)	$	(33,408	)
Net loss attributable to BlackLine, Inc.	$	(33,051	)	$	(357	)	$	(33,408	)
Basic net loss per share attributable to BlackLine, Inc.	$	(0.63	)	$	(0.01	)	$	(0.64	)
Diluted net loss per share attributable to BlackLine, Inc.	$	(0.63	)	$	(0.01	)	$	(0.64	)

Consolidated Statements of Comprehensive Loss
	Year Ended December 31, 2018
	As Previously Reported			Adjustments			As Revised
	(in thousands)
Net loss	$	(27,866	)	$	(910	)	$	(28,776	)
Comprehensive loss	$	(27,626	)	$	(910	)	$	(28,536	)
Comprehensive loss attributable to BlackLine, Inc.	$	(27,696	)	$	(910	)	$	(28,606	)

	Year Ended December 31, 2017
	As Previously Reported			Adjustments			As Revised
	(in thousands)
Net loss	$	(33,051	)	$	(357	)	$	(33,408	)
Comprehensive loss	$	(33,073	)	$	(357	)	$	(33,430	)
Comprehensive loss attributable to BlackLine, Inc.	$	(33,073	)	$	(357	)	$	(33,430	)

Consolidated Statements of Stockholders' Equity
	Year Ended December 31, 2018
	As Previously Reported			Adjustments			As Revised
Accumulated Deficit	(in thousands)
Balance at December 31, 2017	$	(102,790	)	$	(1,392	)	$	(104,182	)
Net loss attributable to BlackLine, Inc.	$	(27,804	)	$	(910	)	$	(28,714	)
Balance at December 31, 2018	$	(130,594	)	$	(2,302	)	$	(132,896	)
Total Equity
Balance at December 31, 2017	$	317,305		$	(1,392	)	$	315,913
Net loss attributable to BlackLine, Inc.	$	(27,804	)	$	(910	)	$	(28,714	)
Balance at December 31, 2018	$	321,569		$	(2,302	)	$	319,267

	Year Ended December 31, 2017
	As Previously Reported			Adjustments			As Revised
Accumulated Deficit	(in thousands)
Balance at December 31, 2016	$	(69,667	)	$	(1,035	)	$	(70,702	)
Balance at January 1, 2017	$	(69,739	)	$	(1,035	)	$	(70,774	)
Net loss attributable to BlackLine, Inc.	$	(33,051	)	$	(357	)	$	(33,408	)
Balance at December 31, 2017	$	(102,790	)	$	(1,392	)	$	(104,182	)
Total Equity
Balance at December 31, 2016	$	309,077		$	(1,035	)	$	308,042
Balance at January 1, 2017	$	309,077		$	(1,035	)	$	308,042
Net loss attributable to BlackLine, Inc.	$	(33,051	)	$	(357	)	$	(33,408	)
Balance at December 31, 2017	$	317,305		$	(1,392	)	$	315,913

Consolidated Statements of Cash Flows
	Year Ended December 31, 2018
	As Previously Reported			Adjustments			As Revised
	(in thousands)
Net loss attributable to BlackLine, Inc.	$	(27,804	)	$	(910	)	$	(28,714	)
Net loss	$	(27,866	)	$	(910	)	$	(28,776	)
Deferred income taxes	$	(923	)	$	1,136		$	213
Accrued expenses and other current liabilities	$	4,417		$	(226	)	$	4,191

	Year Ended December 31, 2017
	As Previously Reported			Adjustments			As Revised
	(in thousands)
Net loss attributable to BlackLine, Inc.	$	(33,051	)	$	(357	)	$	(33,408	)
Net loss	$	(33,051	)	$	(357	)	$	(33,408	)
Deferred income taxes	$	(272	)	$	357		$	85

Leases

On January 1, 2019, the Company adopted Accounting Standards Codification No. 842, Leases, on a modified retrospective basis.

Financial information related to periods prior to adoption are as originally reported under ASC 840, Leases. At January 1, 2019, the Company recorded operating lease right-of-use (“ROU”) assets of $14.9 million and operating lease liabilities of $18.3 million. The difference between the leased assets and lease liabilities represents the existing deferred rent liabilities balance at adoption, resulting from historical straight-line recognition of operating leases, which was reclassified upon adoption to reduce the measurement of the leased assets. The adoption of the standard did not have an impact on the Company’s stockholders’ equity, results of operations, or cash flows.

The new standard provides several optional practical expedients in transition. The Company elected the package of three practical expedients permitted under the transition guidance, which eliminates the requirement to reassess whether a contract contains a lease and lease classification.

The Company has also made accounting policy elections, including a short-term lease exception policy, permitting the Company to not apply the recognition requirements of this standard to short-term leases (i.e. leases with expected terms of 12 months or less), and an accounting policy to account for lease and certain non-lease components as a single component for certain classes of assets. The portfolio approach, which allows a lessee to account for its leases at a portfolio level, was elected for certain equipment leases in which the difference in accounting for each asset separately would not have been materially different from accounting for the assets as a combined unit.

The Company has leases for office space, equipment, and data centers. The Company’s leases have remaining initial lease terms of less than one year to approximately six years, some of which include options to extend the leases for up to ten years, and some of which include options to terminate the leases within one year.

The Company determines whether an arrangement is a lease, or contains a lease, at inception if the Company is both able to identify an asset and can conclude it has the right to control the identified asset for a period of time. Leases are included in operating lease ROU assets and operating lease liabilities on the Company’s consolidated balance sheets. Leases with an initial term of 12 months or less are not recorded on the consolidated balance sheet.

ROU assets represent the Company’s right to control an underlying asset for the lease term, and lease liabilities represent the Company’s obligation to make lease payments arising from the lease. ROU assets and operating lease liabilities are recognized at commencement date based on the present value of lease payments over the lease term. As the Company’s leases do not provide an implicit rate, the Company used its incremental borrowing rate based on the information available at commencement date in determining the discount rate used to present value lease payments. The Company used the incremental borrowing rate on January 1, 2019 for operating leases that commenced on or prior to that date. The Company uses the incremental borrowing rate at the commencement date, or remeasurement date, for operating leases. The incremental borrowing rate used is estimated based on what the Company would be required to pay for a collateralized loan over a similar term. Additionally, the Company used the portfolio approach when applying the discount rate selected based on the dollar amount and term of the obligation. The Company’s leases typically do not include any residual value guarantees, bargain purchase options, or asset retirement obligations.

The Company’s lease terms are only for periods in which it has enforceable rights. A lease is no longer enforceable when both the lessee and the lessor each have the right to terminate the lease without permission from the other party with no more than an insignificant penalty. The Company’s lease terms are impacted by options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. The Company generally uses the base, non-cancelable lease term when determining the lease assets and liabilities.

The Company’s agreements may contain variable lease payments. The Company includes variable lease payments that depend on an index or a rate and excludes those which depend on facts or circumstances occurring after the commencement date, other than the passage of time. Additionally, for certain equipment leases, the Company applies a portfolio approach to effectively account for the operating lease ROU assets and operating lease liabilities.

Judgment is required when determining whether any of the Company’s data center contracts contain a lease. The Company concluded a lease exists when the asset is specifically identifiable, substantially all the economic benefit of the asset is obtained, and the right to direct the use of the asset exists during the term of the lease.

Redeemable non-controlling interest

The Company's Japanese subsidiary (“BlackLine K.K.”) is not wholly owned. The agreements with the minority investors of BlackLine K.K. contain redemption features whereby the interest held by the minority investors are redeemable either (i) at the option of the minority investors or (ii) at the option of the Company, both beginning on the seventh anniversary of the initial capital contribution. If the interest of the minority investors were to be redeemed under these agreements, the Company would be required to redeem the interest based on a prescribed formula derived from the relative revenue of BlackLine K.K. and the Company. The balance of the redeemable non-controlling interest is reported at the greater of the initial carrying amount adjusted for the redeemable non-controlling interest's share of earnings or losses and other comprehensive income or loss, or its estimated redemption value. The resulting changes in the estimated redemption amount (increases or decreases) are recorded with corresponding adjustments against retained

earnings or, in the absence of retained earnings, additional paid-in-capital. These interests are presented on the consolidated balance sheets outside of equity under the caption "Redeemable non-controlling interest."

Convertible Senior Notes

The Company accounts for the issued Convertible Senior Notes (the “Notes”) as separate liability and equity components. The carrying amount of the liability component was calculated by measuring the fair value of a similar liability that does not have an associated convertible feature. The carrying amount of the equity component representing the difference between the proceeds and the fair value of a similar liability that does not have an associated convertible feature. This difference represents a debt discount that is amortized to interest expense over the term of the Notes using the effective interest rate method. The equity component is not remeasured as long as it continues to meet the conditions for equity classification. The Company has allocated issuance costs incurred to the liability and equity components. Issuance costs attributable to the liability component are being amortized to expense over the respective term of the Notes, and issuance costs attributable to the equity components were netted with the respective equity component in additional paid-in capital.

Use of estimates

The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the dates of the consolidated financial statements, and the reported amounts of revenues and expenses during the reporting period.

On an ongoing basis, management evaluates its estimates, primarily those related to determining the stand alone selling price (“SSP”) for separate deliverables in the Company’s subscription revenue arrangements, allowance for doubtful accounts, fair value of assets and liabilities assumed in a business combination, recoverability of goodwill and long-lived assets, useful lives associated with long-lived assets, income taxes, contingencies, fair value of contingent consideration, fair value of convertible senior notes, redemption value of redeemable non-controlling interest, and the valuation and assumptions underlying stock-based compensation and common stock warrants. These estimates are based on historical data and experience, as well as various other factors that management believes to be reasonable under the circumstances. Actual results could differ from those estimates.

Segments

Management has determined that the Company has one operating segment. The Company’s chief executive officer, who is the Company’s chief operating decision maker, reviews financial information on a consolidated and aggregate basis, together with certain operating metrics principally to make decisions about how to allocate resources and to measure the Company’s performance.

Cash and cash equivalents

The Company considers all highly liquid investments with an original or remaining maturity of three months or less at the date of purchase to be cash equivalents. Cash includes cash held in checking and savings accounts. Cash equivalents are comprised of investments in money market mutual funds. The carrying value of cash and cash equivalents approximates fair value.

Restricted cash

Included in prepaid expenses and other current assets and other assets at December 31, 2019 and in other assets at December 31, 2018 was cash totaling $0.3 million, the vast majority of which was required to be restricted as to use by the Company’s office leaseholder to collateralize a standby letter of credit, the remainder was required to be restricted under the terms of the Company’s corporate credit card program.

Investments in Marketable Securities

The Company’s marketable securities consist of commercial paper, corporate bonds, and U.S. treasury securities. The Company classifies its marketable securities as available-for-sale at the time of purchase, and the Company reevaluates such classification at each balance sheet date. All marketable securities are recorded at their estimated fair value, with any unrealized gains and losses reported as a component of stockholders’ equity until realized or until a determination is made that an other-than-temporary decline in market value has occurred. Impairments are considered to be other than temporary if they are related to deterioration in credit risk or if it is likely the Company will sell the securities before the recovery of their cost basis. Realized gains and losses and declines in value deemed to be other than temporary are determined based on the specific identification method and are reported in other income (expense), net in the consolidated statements of operations.

The Company classifies its investments in marketable securities in current assets as the investments are available for use, if needed, in current operations.

Accounts receivable and allowance for doubtful accounts

Accounts receivable are recorded at the invoiced amount, do not require collateral and do not bear interest. The Company estimates its allowance for doubtful accounts by evaluating specific accounts where information indicates the Company’s customers may have an inability to meet financial obligations, such as bankruptcy and significantly aged receivables outstanding.

Concentration of credit risk and significant customers

Financial instruments that potentially subject the Company to a significant concentration of credit risk consist of cash and cash equivalents, investments in marketable securities and accounts receivable.

The Company maintains the majority of its cash balances with one major commercial bank in interest bearing accounts, which exceeds the Federal Deposit Insurance Corporation, or FDIC, federally insured limits.

The Company invests its excess cash in money market mutual funds, commercial paper, corporate bonds, and U.S. treasury securities. To date, the Company has not experienced any impairment losses on its investments.

For the years ended December 31, 2019, 2018, and 2017, no single customer comprised 10% or more of the Company’s total revenues. No single customer had an accounts receivable balance of 10% or greater of total accounts receivable at December 31, 2019 or 2018.

Property and equipment

Property and equipment is stated at cost less accumulated depreciation. Depreciation is computed using the straight-line method over the estimated useful lives of the assets, which is generally three to five years for machinery and equipment and purchased software and five years for furniture and fixtures. Leasehold improvements are amortized using the straight-line method over the shorter of the lease term or seven years. Expenditures for repairs and maintenance are expensed as incurred, while renewals and betterments are capitalized. Depreciation expense is charged to operations on a straight-line basis over the estimated useful lives of the assets.

Capitalized internal-use software costs

The Company accounts for the costs of computer software obtained or developed for internal use in accordance with ASC 350, Intangibles—Goodwill and Other (“ASC 350”). The Company capitalizes certain costs in the development of its Software as a Service (“SaaS”) subscription solution when (i) the preliminary project stage is completed, (ii) management has authorized further funding for the completion of the project and (iii) it is probable that the project will be completed and performed as intended. These capitalized costs include personnel and related expenses for employees and costs of third-party contractors who are directly associated with and who devote time to internal-use software projects. Capitalization of these costs ceases once the project is substantially complete and the software is ready for its intended purpose. Costs incurred for significant upgrades and enhancements to the Company’s SaaS software solutions are also capitalized. Costs incurred for training, maintenance and minor modifications or enhancements are expensed as incurred. Capitalized software development costs are amortized using the straight-line method over an estimated useful life of three years.

During the years ended December 31, 2019, 2018, and 2017, the Company amortized $4.7 million, $3.9 million, and $2.7 million, respectively, of internal-use software development costs to subscription and support cost of revenues. At December 31, 2019 and 2018, the accumulated amortization of capitalized internal-use software development costs was $14.3 million and $9.5 million, respectively.

The Company capitalizes certain implementation costs incurred in a hosting arrangement that is a service contract. These capitalized costs exclude training costs, project management costs, and data migration costs. Capitalized software implementation costs are amortized using the straight-line method over the terms of the associated hosting arrangements.

Amortization of internal-use software implementation costs to subscription and support costs of revenues was not material for the year ended December 31, 2019. During the years ended December 31, 2018 and 2017, the Company had no amortization of internal-use software implementation costs.

Intangible assets

Intangible assets primarily consist of acquired developed technology, customer relationships, and trade names, which were acquired as part of the 2013 Acquisition and the Runbook Acquisition. The Company determines the appropriate useful life of its intangible assets by performing an analysis of expected cash flows of the acquired assets. Intangible assets are amortized on a straight-line basis over their estimated useful lives, ranging from one to ten years.

Impairment of long-lived assets

Management evaluates the recoverability of the Company’s property and equipment, finite-lived intangible assets and capitalized internal-software costs when events or changes in circumstances indicate a potential impairment exists. Events and changes in circumstances considered by the Company in determining whether the carrying value of long-lived assets may not be recoverable include, but are not limited to, significant changes in performance relative to expected operating results, significant changes in the use of the assets, significant negative industry or economic trends, and changes in the Company’s business strategy. Impairment testing is performed at an asset level that represents the lowest level for which identifiable cash flows are largely independent of the cash flows of other assets and liabilities (an “asset group”). In determining if impairment exists, the Company estimates the undiscounted cash flows to be generated from the use and ultimate disposition of the asset group. If impairment is indicated based on a comparison of the assets’ carrying values and the undiscounted cash flows, the impairment loss is measured as the amount by which the carrying amount of the assets exceeds the fair value of the assets. The Company determined that there were no events or changes in circumstances that potentially indicated that the Company’s long-lived assets were impaired during the years ended December 31, 2019, 2018, and 2017.

Goodwill

Goodwill represents the excess of the purchase price over the fair value of net assets acquired in a business combination. The Company tests goodwill for impairment in accordance with the provisions of Accounting Standards Codification (“ASC”) 350, Intangibles—Goodwill and Other. Goodwill is tested for impairment at least annually at the reporting unit level or whenever events or changes in circumstances indicate that goodwill might be impaired. Events or changes in circumstances which could trigger an impairment review include a significant adverse change in legal factors or in the business climate, unanticipated competition, loss of key personnel, significant changes in the use of the acquired assets or the Company’s strategy, significant negative industry or economic trends, or significant underperformance relative to expected historical or projected future results of operations.

ASC 350 provides that an entity has the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If, after assessing the totality of events or circumstances, an entity determines it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, then additional impairment testing is not required. However, if an entity concludes otherwise, then it is required to perform the first of a two-step impairment test.

The first step involves comparing the estimated fair value of a reporting unit with its book value, including goodwill. If the estimated fair value exceeds book value, goodwill is considered not to be impaired and no additional steps are necessary. If, however, the fair value of the reporting unit is less than book value, then, under the second step, the carrying amount of the goodwill is compared with its implied fair value. The estimate of implied fair value of goodwill may

require valuations of certain internally-generated and unrecognized intangible assets. If the carrying amount of goodwill exceeds the implied fair value of that goodwill, an impairment loss is recognized in an amount equal to the excess.

The Company has one reporting unit and it tests its goodwill for impairment annually, during the fourth quarter of the calendar year. At December 31, 2019 and 2018, the Company used the quantitative approach to perform its annual goodwill impairment test. The Company’s fair value significantly exceeded the carrying value of its net assets and, accordingly, goodwill was not impaired.

Fair value of financial instruments

ASC 820, Fair Value Measurement, requires entities to disclose the fair value of financial instruments, both assets and liabilities recognized and not recognized on the balance sheet, for which it is practicable to estimate fair value. Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date.

Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. ASC 820 describes a fair value hierarchy based on three levels of inputs, of which the first two are considered observable and the last unobservable, that may be used to measure fair value, which are the following:

Level 1:

Quoted prices in active markets for identical or similar assets and liabilities.

Level 2:

Quoted prices for identical or similar assets and liabilities in markets that are not active or observable inputs other than quoted prices in active markets for identical or similar assets or liabilities.

Level 3:

Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

At December 31, 2019 and 2018, the carrying values of cash equivalents, accounts receivable, accounts payable, and accrued expenses, approximate fair values due to the short-term nature of such instruments.

Contingent consideration relating to the 2013 Acquisition (see Note 13) is recorded as a liability and is measured at fair value each period, based on significant inputs not observable in the market, which represents a Level 3 measurement within the fair value hierarchy. The valuation of contingent consideration uses assumptions management believes would be made by a market participant. Management assesses these estimates on an ongoing basis as additional data impacting the assumptions becomes available. Changes in the fair value of contingent consideration related to updated assumptions and estimates are recognized within general and administrative expenses in the consolidated statements of operations. The Company determined the fair value of the contingent consideration by discounting estimated future taxable income. The significant inputs used in the fair value measurement of contingent consideration are the timing and amount of taxable income in any given period and determining an appropriate discount rate, which considers the risk associated with the forecasted taxable income. Significant changes in the estimated future taxable income and the periods in which they are generated would significantly impact the fair value of the contingent consideration liability.

Certain assets, including goodwill and long-lived assets, are also subject to measurement at fair value on a non-recurring basis if they are deemed to be impaired as a result of an impairment review. For the years ended December 31, 2019, 2018, and 2017, no impairments were identified on those assets required to be measured at fair value on a non-recurring basis.

Revenue recognition

Revenue is recognized upon transfer of control of promised products or services to customers in an amount that reflects the consideration the Company expects to receive in exchange for those products or services. The Company enters into contracts that can include various combinations of subscription and support services and professional services, which are generally capable of being distinct and accounted for as separate performance obligations. The Company’s agreements do not contain any refund provisions other than in the event of the Company’s non-performance or breach.

The Company determines revenue recognition through the following steps:

•

Identification of the contract, or contracts, with a customer

•

Identification of the performance obligations in the contract

•

Determination of the transaction price

•

Allocation of the transaction price to the performance obligations in the contract

•

Recognition of revenue when, or as, the Company satisfies a performance obligation

Subscription and support revenue – Customers pay subscription and support fees for access to the Company’s SaaS platform generally for a one-year period. In more limited cases, customers may pay for up to three years in advance. Fees are based on a number of factors, including the solutions subscribed for by the customer and the number of users having access to the solutions. Subscription services, which allow customers to use hosted software over the contract period without taking possession of the software, are considered distinct performance obligations and are recognized ratably as the Company transfers control evenly over the contract period.

Subscription and support revenue also includes software and related maintenance and support fees on legacy BlackLine solutions and Runbook Company B.V. (“Runbook”) software. Software licenses for legacy BlackLine solutions and Runbook software provide the customer with a right to use the software as it exists when made available to the customer. Customers may have purchased perpetual licenses or term based licenses, which provide customers with the same functionality and differ mainly in the duration over which the customer benefits from the software.

Software licenses are bundled with software maintenance and support, and the transaction price of the contract is allocated between the software licenses and the software maintenance and support. Maintenance and support convey rights to new software and upgrades released over the contract period and provide support, tools, and training to help customers deploy and use products more efficiently. Software licenses are considered distinct performance obligations and revenue is recognized at a point in time when control of the license has transferred and the license period commences. Maintenance and support are distinct performance obligations that are satisfied over time, and revenue is recognized ratably over the contract period as customers simultaneously consume and receive benefits.

Professional services revenue – Professional services consist of implementation and consulting services to assist the Company’s customers as they deploy its solutions. These services are considered distinct performance obligations. Professional services do not result in significant customization of the subscription service. The Company applies the practical expedient to recognize professional services revenue when it has the right to invoice based on time and materials incurred.

Significant judgments – The Company’s contracts with customers often include promises to transfer multiple products and services. Determining whether products and services are considered distinct performance obligations that should be accounted for separately versus together may require significant judgment. Judgment is also required to determine the SSP for each distinct performance obligation. The Company typically has more than one SSP for its SaaS solutions and professional services. Additionally, management has determined that there are no third-party offerings reasonably comparable to the Company’s solutions. Therefore, the Company determines the SSPs of subscriptions to the SaaS solutions and professional services based on numerous factors including the Company’s overall pricing objectives, geography, customer size and number of users, and discounting practices. The Company uses historical maintenance renewal fees to estimate SSP for maintenance and support fees bundled with software licenses. The Company uses the residual method to estimate SSP of software licenses, because license pricing is highly variable and not sold separately from maintenance and support.

Contract balances – Timing of revenue recognition may differ from the timing of invoicing to customers. The Company records an unbilled receivable when revenue is recognized prior to invoicing, and deferred revenue when revenue is recognized subsequent to invoicing. The Company generally invoices customers annually at the beginning of each annual contract period. The Company records a receivable related to revenue recognized for multi-year agreements as it has an unconditional right to invoice and receive payment in the future related to those services.

Deferred revenue is comprised mainly of billings related to the Company’s SaaS solutions in advance of revenue being recognized. Deferred revenue also includes payments for: professional services to be performed in the future; legacy BlackLine maintenance and support; Runbook maintenance, support, license, and implementation; and other

offerings for which the Company has been paid in advance and earns the revenue when the Company transfers control of the product or service.

Changes in deferred revenue for the years ended December 31, 2019, 2018, and 2017 were primarily due to additional billings in the periods, partially offset by revenue recognized of $129.3 million, $104.2 million, and $78.2 million, respectively, that was previously included in the deferred revenue balance at December 31, 2018, 2017, and 2016, respectively.

The transaction price is generally determined by the stated fixed fees in the contract, excluding any related sales taxes. Transaction price allocated to remaining performance obligations represents contracted revenue that has not yet been recognized (“contracted not recognized”), which includes deferred revenue and amounts that will be invoiced and recognized as revenue in future periods. Contracted not recognized revenue was $366.9 million at December 31, 2019, of which the Company expects to recognize approximately 60% over the next 12 months and the remainder thereafter.

Fees are generally due and payable upon receipt of invoice or within 30 days. None of the Company’s contracts include a significant financing component.

Assets recognized from the costs to obtain a contract with a customer – The Company recognizes an asset for the incremental and recoverable costs of obtaining a contract with a customer if the Company expects the benefit of those costs to be one year or longer. The Company has determined that certain sales incentive programs to the Company’s employees ("deferred customer contract acquisition costs") and its partners ("partner referral fees") meet the requirements to be capitalized. Deferred customer acquisition costs related to new revenue contracts and upsells are deferred and then amortized on a straight-line basis over the expected period of benefit, which the Company has determined to be five years, based upon both the product turnover rate and estimated customer life. Partner referral fees are deferred and then amortized on a straight-line basis over the related contractual period, as the fees for renewals are commensurate with fees incurred for the initial contract. Deferred customer acquisition costs and partner referral fees are included within other assets and prepaid expenses and other current assets, respectively, on the consolidated balance sheets. There were no impairment losses in relation to the costs capitalized for the periods presented.

Amortization expense related to the asset recognized from the costs to obtain a contract with a customer is included in sales and marketing expenses in the consolidated statements of operations and was $18.1 million, $23.6 million, and $15.6 million for the years ended December 31, 2019, 2018, and 2017, respectively.

Cost of revenues

Cost of revenues primarily consists of costs related to hosting the Company’s cloud-based application suite, salaries and benefits of operations and support personnel, including stock-based compensation, and amortization of capitalized internal-use software costs. The Company allocates a portion of overhead, such as rent, information technology costs and depreciation and amortization to cost of revenues. Costs associated with providing professional services are expensed as incurred when the services are performed. In addition, subscription and support cost of revenues includes amortization of acquired developed technology.

Sales and marketing

Sales and marketing expenses consist primarily of compensation and employee benefits, including stock-based compensation, of sales and marketing personnel and related sales support teams, sales and partner commissions, marketing events, advertising costs, travel, trade shows, other marketing materials, and allocated overhead. Sales and marketing expenses also include amortization of customer relationship intangible assets. Advertising costs are expensed as incurred and totaled $10.9 million, $8.0 million, and $7.7 million for the years ended December 31, 2019, 2018, and 2017, respectively.

Research and development

Research and development expenses are comprised primarily of salaries, benefits and stock-based compensation associated with the Company’s engineering, product and quality assurance personnel. Research and development expenses also include third-party contractors and supplies and allocated overhead. Other than software development costs that qualify for capitalization, as discussed above, research and development costs are expensed as incurred.

General and administrative

General and administrative expenses consist primarily of personnel costs associated with the Company’s executive, finance, legal, human resources, compliance, and other administrative personnel, as well as accounting and legal professional services fees, other corporate-related expenses and allocated overhead. General and administrative expenses also include amortization of covenant not to compete and tradename intangible assets, the change in value of the contingent consideration, legal settlement gains, costs associated with the secondary offering, and costs associated with the shelf offerings.

Stock-based compensation

The Company accounts for stock-based compensation awards granted to employees and directors based on the awards’ estimated grant date fair value. The Company estimates the fair value of its stock options using the Black-Scholes option-pricing model. For awards that vest solely based on continued service (“service-only vesting conditions”), the resulting fair value is recognized on a straight-line basis over the period during which an employee is required to provide service in exchange for the award, usually the vesting period, which is generally four years. The Company recognizes the fair value of stock options which contain performance conditions based upon the probability of the performance conditions being met, using the graded vesting method. On January 1, 2017, the Company changed its accounting policy to account for forfeitures when they occur rather than estimate a forfeiture rate.

Determining the grant date fair value of options using the Black-Scholes option-pricing model requires management to make assumptions and judgments. These estimates involve inherent uncertainties and, if different assumptions had been used, stock-based compensation expense could have been materially different from the amounts recorded.

The assumptions and estimates are as follows:

Value per share of the Company’s common stock. The fair value of the underlying common stock was determined by the Company’s board of directors through the date of the initial public offering. For awards granted subsequent to the Company’s initial public offering, the fair value of common stock is based on the closing price of the Company’s common stock, as reported on the NASDAQ, on the date of grant.

Expected volatility. The Company determines the expected volatility based on historical average volatilities of similar publicly-traded companies corresponding to the expected term of the awards. The Company determines expected volatility for the Employee Stock Purchase Plan (“ESPP”) based on the historical volatility of its common stock.

Expected term. The Company determines the expected term of awards which contain service-only vesting conditions using the simplified approach, in which the expected term of an award is presumed to be the mid-point between the vesting date and the expiration date of the award, as the Company does not have sufficient historical data relating to stock option exercises. The expected term for the Company’s ESPP represents the amount of time remaining in the 12-month offering period.

Risk-free interest rate. The risk-free interest rate is based on the United States Treasury yield curve in effect during the period the options were granted corresponding to the expected term of the awards.

Estimated dividend yield. The estimated dividend yield is zero, as the Company does not currently intend to declare dividends in the foreseeable future.

The following information represents the weighted average of the assumptions used in the Black-Scholes option-pricing model for stock options granted:

	Year Ended December 31,
	2019		2018		2017
Expected term (years)		6.1		6.1		6.2
Expected volatility	46.7%		46.0%		47.0%
Risk free interest rate	2.2%		2.8%		2.1%
Expected dividend yield		—		—		—

Income taxes

The Company accounts for income taxes in accordance with ASC 740, Income Taxes. ASC 740 requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of temporary differences between the carrying amounts and the tax bases of assets and liabilities. Deferred income tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in the consolidated statements of operations in the period that includes the enactment date. A valuation allowance is recorded when it is more likely than not that some of the deferred tax assets will not be realized.

The Company recognizes the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained on examination by the taxing authorities, based on the technical merits of the position. The tax benefits recognized in the consolidated financial statements from such positions are then measured based on the largest benefit that has a greater than 50% likelihood of being realized. The Company recognizes interest and penalties accrued with respect to uncertain tax positions, if any, in the provision for income taxes in the consolidated statements of operations.

Net loss per share

Basic and diluted loss per share is calculated by dividing net loss attributable to BlackLine, Inc. by the weighted average number of shares of common stock outstanding. As the Company has net losses for the periods presented, all potentially dilutive common stock, which are comprised of stock options and restricted stock units, are antidilutive.

Foreign currency

The Company’s functional currency for its foreign subsidiaries is the U.S. Dollar (“USD”), with the exception of its BlackLine K.K. subsidiary, for which the Japanese Yen is the functional currency. The foreign exchange impacts of remeasuring the local currency of the foreign subsidiaries to the functional currency is recorded in general and administrative expenses in the Company’s consolidated statements of operations. Monetary assets and liabilities of foreign operations are remeasured at balance sheet date exchange rates, non-monetary assets and liabilities and equity are remeasured at the historical exchange rates, while results of operations are remeasured at average exchange rates in effect for the period. Foreign currency transaction gains (losses) totaled $(0.5) million, $(0.1) million, and $0.6 million for the years ended December 31, 2019, 2018, and 2017, respectively. The financial statements of BlackLine K.K. are translated to USD using balance sheet date exchange rates for monetary assets and liabilities, historical rates of exchange for non-monetary assets and liabilities and equity, and average exchange rates in the period for revenues and expenses. Translation gains and losses are recorded in accumulated other comprehensive income (loss) as a component of stockholders’ equity in the consolidated balance sheets.

Recent accounting pronouncements

Recently issued accounting pronouncements not yet adopted

In June 2016, the Financial Accounting Standards Board (“FASB”) issued guidance which requires that financial assets measured at amortized cost be presented at the net amount expected to be collected. This guidance amends the accounting for credit losses for available-for-sale securities and purchased financial assets with credit deterioration. This guidance is effective for annual periods beginning after December 15, 2019, and interim periods within those annual periods. Early adoption is permitted for any interim or annual period after December 15, 2018. The Company does not expect the adoption of this Accounting Standard Update (“ASU”) to have a material impact on its consolidated financial statements.

In August 2018, the FASB issued guidance which modifies the disclosure requirements on fair value measurements in Topic 820, Fair Value Measurement, based on the concepts in FASB Concepts Statement, Conceptual Framework for Financial Reporting—Chapter 8: Notes to Financial Statements, including the consideration of costs and benefits. The guidance will be effective for the Company for annual reporting periods, and interim periods within those years, beginning after December 15, 2019. The amendments on changes in unrealized gains and losses, the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements, and the narrative description of measurement uncertainty should be applied prospectively for only the most recent interim or annual period presented in the initial fiscal year of adoption. All other amendments should be applied retrospectively to all periods presented upon their effective date. The Company does not expect the adoption of this ASU to have a material impact on its consolidated financial statements.

Recently adopted accounting pronouncements

In August 2018, the FASB issued guidance which aligns the accounting for implementation costs incurred in a hosting arrangement that is a service contract with the accounting for implementation costs incurred to develop or obtain internal-use software under ASC 350-40, in order to determine which costs to capitalize and recognize as an asset. The guidance will be effective for the Company for annual reporting periods, and interim periods within those years, beginning after December 15, 2019, and can be applied either prospectively to implementation costs incurred after the date of adoption or retrospectively to all arrangements. The Company adopted this guidance on a prospective basis effective April 1, 2019.

In February 2016, the FASB issued a new standard related to leases to increase transparency and comparability among organizations by requiring the recognition of ROU assets and lease liabilities on the balance sheet. Most prominent among the changes in the standard is the recognition of ROU assets and lease liabilities by lessees for those leases classified as operating leases. Under the standard, disclosures are required to meet the objective of enabling users of financial statements to assess the amount, timing, and uncertainty of cash flows arising from leases. The Company adopted this guidance effective January 1, 2019.

In February 2018, the FASB issued an ASU that provides companies with an option to reclassify stranded tax effects resulting from enactment of the Tax Cuts and Jobs Act (the “Tax Act”) from accumulated other comprehensive income to retained earnings. The Company adopted this guidance effective January 1, 2019, and the adoption of this standard did not have a material impact on the Company’s consolidated financial statements.

In June 2018, the FASB issued guidance which expands the scope of Accounting Standards Codification Topic 718, Compensation—Stock Compensation, to include share-based payments granted to non-employees in exchange for goods or services. The fair value of awards granted to non-employees will be determined as of the grant date, which will be recognized over the service period. Previous guidance required the awards to be remeasured at fair value periodically when determining the related expense. The Company adopted this guidance effective January 1, 2019, and the adoption of this standard did not have a material impact on the Company’s consolidated financial statements.

In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740), Simplifying the Accounting for Income Taxes, which is intended to simplify various aspects related to accounting for income taxes. ASU 2019-12 removes certain exceptions to the general principles in Topic 740 and clarifies and amends existing guidance to improve consistent application. ASU 2019-12 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. Early adoption is permitted, including adoption in an interim period. ASU 2019-12 is effective for us in the first quarter of fiscal 2022. The Company early adopted this guidance effective January 1, 2019, and the adoption of this standard did not have a material impact on the Company’s consolidated financial statements.

Revenues

12 Months Ended

Dec. 31, 2019

Revenue From Contract With Customer [Abstract]

Revenues

Note 3—Revenues

The Company disaggregates its revenue from contracts with customers by geographic location, as it believes it best depicts how the nature, amount, timing, and uncertainty of its revenues and cash flows are affected by economic factors.

The following table sets forth the Company’s revenues by geographic region (in thousands):

	Year Ended December 31,
	2019		2018		2017
United States	$	223,375	$	180,152	$	141,499
International		65,601		47,636		34,104
	$	288,976	$	227,788	$	175,603

No countries outside the United States represented 10% or more of total revenues.

Redeemable Non-Controlling Interest

12 Months Ended

Dec. 31, 2019

Equity Method Investments And Joint Ventures [Abstract]

Redeemable Non-Controlling Interest

Note 4—Redeemable Non-Controlling Interest

In September 2018, the Company entered into an agreement with Japanese Cloud Computing and M30 LLC (the “Investors”) to engage in the investment, organization, management, and operation of a Japanese subsidiary (“BlackLine K.K.”) of the Company that is focused on the sale of the Company's products in Japan. In October 2018, the Company

initially contributed approximately $4.5 million in cash in exchange for 51% of the outstanding common stock of BlackLine K.K. As the Company controls a majority stake in BlackLine K.K., the entity has been consolidated.

All of the common stock held by the Investors is callable by the Company or puttable by the Investors upon certain contingent events. Should the call or put option be exercised, the redemption value will be determined based upon a prescribed formula derived from the discrete revenues of BlackLine K.K. and the Company and may be settled, at the Company’s discretion, with Company stock or cash. As a result of the put right available to the Investors in the future, the redeemable non-controlling interest in BlackLine K.K. are classified outside of permanent equity in the Company’s consolidated balance sheet, and the balance is reported at the greater of the initial carrying amount adjusted for the redeemable non-controlling interest’s share of earnings, or its estimated redemption value. The resulting changes in the estimated redemption amount are recorded within retained earnings or, in the absence of retained earnings, additional paid-in-capital. The estimated redemption value of the call/put option embedded in the redeemable non-controlling interest was $1.8 million at December 31, 2019.

The following table summarizes the activity in the redeemable non-controlling interest for the periods indicated below:

	December 31,
	2019			2018
Balance at beginning of period	$	4,387		$	—
Investment by redeemable non-controlling interest		—			4,317
Net loss attributable to redeemable non-controlling interest (excluding adjustment to non-controlling interest)		(1,444	)		(62	)
Foreign currency translation		129			132
Adjustment to redeemable non-controlling interest		1,833			—
Balance at end of period	$	4,905		$	4,387

Balance Sheet Components

12 Months Ended

Dec. 31, 2019

Balance Sheet Related Disclosures [Abstract]

Balance Sheet Components

Note 5—Balance Sheet Components

Investments in Marketable Securities

Investments in marketable securities presented within current assets on the consolidated balance sheet consisted of the following:

	December 31, 2019
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in thousands)
Marketable securities
U.S. treasury securities	$	382,269	$	67	$	(1	)	$	382,335
Corporate bonds		77,009		63		(18	)		77,054
Commercial paper		28,126		—		—			28,126
	$	487,404	$	130	$	(19	)	$	487,515

	December 31, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in thousands)
Marketable securities
U.S. treasury securities	$	25,856	$	—	$	(29	)	$	25,827
Corporate bonds		32,030		—		(60	)		31,970
Commercial paper		28,599		—		—			28,599
	$	86,485	$	—	$	(89	)	$	86,396

During the years ended December 31, 2019, 2018, and 2017 there were no material realized gains or losses related to sales of marketable securities recognized in the Company’s consolidated statements of operations. Net gains and

losses related to maturities of marketable securities that were reclassified from accumulated other comprehensive loss to earnings, and included in general and administrative expenses, in the consolidated statements of operations were $2.0 million and $1.0 million for the years ended December 31, 2019 and 2018, respectively. Net gains and losses related to maturities of marketable securities that were reclassified from accumulated other comprehensive loss to earnings, and included in general and administrative expenses, in the consolidated statements of operations were not material for the year ended December 31, 2017.

The Company’s marketable securities have a contractual maturity of less than two years. The amortized cost and fair values of marketable securities, by remaining contractual maturity, were as follows:

	December 31, 2019
	Amortized Cost		Fair Value
	(in thousands)
Maturing within 1 year	$	473,221	$	473,321
Maturing between 1 and 2 years		14,183		14,194
	$	487,404	$	487,515

Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consisted of the following (in thousands):

	December 31,
	2019		2018
Partner referral fees	$	833	$	5,219
Other prepaid expenses and other current assets		11,997		8,823
	$	12,830	$	14,042

Other Assets

Other assets consisted of the following (in thousands):

	December 31,
	2019		2018
Deferred customer contract acquisition costs	$	49,709	$	34,172
Restricted cash		250		274
Capitalized software implementation costs		1,237		—
Other assets		1,687		2,032
	$	52,883	$	36,478

Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consisted of the following (in thousands):

	December 31,
	2019		2018
Accrued salaries and employee benefits	$	20,775	$	17,054
Accrued income and other taxes payable		4,198		4,321
Short-term tenant improvement allowance		—		475
Other accrued expenses and current liabilities		5,125		2,629
	$	30,098	$	24,479

Leases

12 Months Ended

Dec. 31, 2019

Lessee Disclosure [Abstract]

Leases

Note 6—Leases

The following table sets forth the Company’s lease expense (in thousands):

	Year Ended December 31, 2019
Operating lease cost	$	5,957
Short-term lease cost		875
Variable cost		630
Total lease cost	$	7,462

Supplemental information related to the Company’s leases was as follows (in thousands, except percentages):

Year Ended

December 31, 2019

Cash paid for amounts included in the measurement of lease liabilities - operating leases

6,613

	At December 31, 2019
Weighted-average remaining lease term - operating leases (in years)		4.2
Weighted-average discount rate - outstanding operating leases		6	%

Maturities of lease liabilities at December 31, 2019 was (in thousands):

2020	$	5,674
2021		4,131
2022		3,067
2023		2,906
2024		473
Thereafter		1,191
Total lease payments		17,442
Less imputed interest		(1,898	)
Total	$	15,544

At December 31, 2019, there were no leases entered into that had not yet commenced.

Future minimum lease payments under non-cancelable operating leases at December 31, 2018 was (in thousands):

2019	$	7,059
2020		5,307
2021		3,786
2022		2,586
2023		2,638
Thereafter		237
Total	$	21,613

Fair Value Measurements

12 Months Ended

Dec. 31, 2019

Fair Value Disclosures [Abstract]

Fair Value Measurements

Note 7—Fair Value Measurements

The following table summarizes the Company’s financial assets and liabilities measured at fair value on a recurring basis by level, within the fair value hierarchy. Financial assets and financial liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement (in thousands):

	December 31, 2019
	Level 1		Level 2		Level 3		Total
Cash equivalents
Money market funds	$	39,767	$	—	$	—	$	39,767
Marketable securities
U.S. treasury securities		382,335		—		—		382,335
Corporate bonds		—		77,054		—		77,054
Commercial paper		—		28,126		—		28,126
Total assets	$	422,102	$	105,180	$	—	$	527,282
Liabilities
Contingent consideration	$	—	$	—	$	6,362	$	6,362
Total liabilities	$	—	$	—	$	6,362	$	6,362

	December 31, 2018
	Level 1		Level 2		Level 3		Total
Cash equivalents
Money market funds	$	32,021	$	—	$	—	$	32,021
Marketable securities
U.S. treasury securities		25,827		—		—		25,827
Corporate bonds		—		31,970		—		31,970
Commercial paper		—		28,599		—		28,599
Total assets	$	57,848	$	60,569	$	—	$	118,417
Liabilities
Contingent consideration	$	—	$	—	$	6,316	$	6,316
Total liabilities	$	—	$	—	$	6,316	$	6,316

The following table summarizes the changes in the contingent consideration liability (in thousands):

	Year Ended December 31,
	2019		2018		2017
Beginning fair value	$	6,316	$	5,866	$	5,238
Change in fair value		46		450		628
Ending fair value	$	6,362	$	6,316	$	5,866

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Property and Equipment

12 Months Ended

Dec. 31, 2019

Property Plant And Equipment [Abstract]

Property and Equipment

Note 8—Property and Equipment

Property and equipment consisted of the following (in thousands):

	December 31,
	2019			2018
Computers and equipment	$	10,547		$	6,598
Purchased software		7,745			7,356
Furniture and fixtures		2,606			2,571
Leasehold improvements		10,134			10,077
Construction in progress		528			—
		31,560			26,602
Less: accumulated depreciation and amortization		(18,536	)		(13,066	)
	$	13,024		$	13,536

Depreciation and amortization expense related to property and equipment was $6.3 million, $5.4 million, and $4.0 million for the years ended December 31, 2019, 2018, and 2017, respectively.

Convertible Senior Notes

12 Months Ended

Dec. 31, 2019

Debt Disclosure [Abstract]

Convertible Senior Notes

Note 9—Convertible Senior Notes

On August 13, 2019, the Company issued 0.125% Convertible Senior Notes due in 2024 for aggregate gross proceeds of $500.0 million, which includes the initial purchasers’ option of $65.0 million, in a private placement in reliance on Section 4(a)(2) of the Securities Act of 1933, as amended (the “Securities Act”). The initial resale of the Notes by the initial purchasers to qualified institutional buyers was exempt from registration pursuant to Rule 144A under the Securities Act. The Notes were issued pursuant to an Indenture (the “Indenture”) between the Company and U.S. Bank National Association, as trustee (the “Trustee”).

Interest on the Notes is payable semi-annually in cash at a rate of 0.125% per annum on February 1 and August 1 of each year, beginning on February 1, 2020. The Notes mature on August 1, 2024 unless redeemed, repurchased or converted prior to such date in accordance with their terms.

Prior to the close of business on the business day immediately preceding May 1, 2024, the Notes will be convertible only under the following circumstances:

(1) during any calendar quarter commencing after the calendar quarter ending on December 31, 2019, and only during such calendar quarter, if the last reported sale price of the common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price for the Notes on each applicable trading day;

(2) during the five business-day period after any five consecutive trading-day period in which the trading price per $1,000 principal amount of Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of the common stock and the conversion rate on each such trading day;

(3) if the Company calls any or all of the Notes for redemption, at any time prior to the close of business on the second scheduled trading day immediately preceding the redemption date; or

(4) upon the occurrence of specified corporate events set forth in the Indenture.

On or after May 1, 2024, until the close of business on the second scheduled trading day immediately preceding the maturity date of the Notes, holders of the Notes, at their option, may convert all or any portion of their Notes regardless of the foregoing conditions.

The Notes have an initial conversion rate of 13.6244 shares of common stock per $1,000 principal amount of Notes, equivalent to an initial conversion price of approximately $73.40 per share of common stock. The conversion rate is subject to adjustment for certain events. Upon conversion, the Company will pay or deliver, as the case may be, cash, shares of its common stock or a combination of cash and shares of its common stock, at its election. It is the Company’s current intent to settle conversions of the Notes through “combination settlement”, which involves repayment of the principal portion in cash and any excess of the conversion value over the principal amount in shares of its common stock.

If the Company undergoes a fundamental change, as described in the Indenture, prior to the maturity date of the Notes, holders of the Notes may require the Company to repurchase all or a portion of the Notes for cash at a price equal to 100% of the principal amount of the Notes to be repurchased, plus any accrued and unpaid interest to, but excluding, the fundamental change repurchase date.

The Notes are the Company’s senior unsecured obligations and will rank senior in right of payment to any of the Company’s indebtedness that is expressly subordinated in right of payment to the Notes; equal in right of payment to any of the Company’s unsecured indebtedness that is not so subordinated; effectively junior in right of payment to any of the Company’s secured indebtedness to the extent of the value of the assets securing such indebtedness; and structurally junior to all indebtedness and other liabilities (including trade payables) of current or future subsidiaries of the Company.

The Indenture contains customary events of default with respect to the Notes and provides that upon certain events of default occurring and continuing, the Trustee may, and the Trustee at the request of holders of at least 25% in principal amount of the Notes shall, declare all principal and accrued and unpaid interest, if any, of the Notes to be due and payable. In case of certain events of bankruptcy, insolvency or reorganization, involving the Company, all of the principal of, and accrued and unpaid interest on the Notes will automatically become due and payable.

In accounting for the issuance of the Notes, the Company allocated the proceeds of the Notes between liability and equity components, with the equity component representing the difference between the proceeds and the fair value of a similar liability that does not have an associated convertible feature. To estimate the fair value of a similar liability that does not have an associated conversion feature, the Company discounted the contractual cash flows of the Notes at an estimated interest rate for a comparable nonconvertible note. The Company applied judgment to determine the interest rate, which was estimated based on the credit spread implied by the Notes issuance and based on the credit spread implied by the J.P. Morgan Yield Index based on estimates of its credit rating. The significant assumptions used in these models were the expected volatility over the term of the Notes and an estimate of the Company’s credit rating. The difference between the principal amount of the Notes and the liability component of $114.2 million was recorded as a debt discount. In addition, the Company incurred $12.8 million of transaction costs related to the Notes of which $9.9 million and $2.9 million, respectively, was allocated to the liability and equity components of the Notes. Transaction costs allocated to the liability component was recorded as additional debt discount. The equity component of the Notes will not be remeasured as long as it continues to meet the conditions for equity classification. The debt discount is amortized to interest expense over the term of the Notes using the effective interest method.

The Notes consisted of the following (in thousands):

	December 31, 2019
Liability:
Principal	$	500,000
Unamortized debt discount and issuance costs		(115,657	)
Net carrying amount	$	384,343
Carrying amount of the equity component	$	111,230

The effective interest rate of the liability component of the Notes, excluding the conversion option, is 6.06%.

The Company carries the Notes at face value less unamortized discount and issuance costs on its consolidated balance sheet and presents the fair value for disclosure purposes only. The estimated fair value of the Notes, based on a market approach at December 31, 2019 was approximately $505.0 million, which represents a Level 2 valuation. The estimated fair value was determined based on the actual bids and offers of the Notes in an over-the-counter market on the last trading day of the period.

During the year ended December 31, 2019, the Company recognized $8.4 million of interest expense related to the amortization of debt discount and issuance costs and $0.2 million of coupon interest expense.

At December 31, 2019, the remaining life of the Notes is approximately 55 months.

The Notes were not convertible at December 31, 2019.

Capped Calls

In conjunction with the issuance of the Notes, the Company entered into capped call transactions (the “Capped Calls”) with a certain counterparty affiliated with the Initial Purchasers and others at a cost of approximately $46.2 million, which was recorded as a reduction of the Company’s additional paid-in capital in the accompanying consolidated financial statements.

Under the Capped Calls, the Company purchased capped call options that in the aggregate relate to the total number of shares of the Company’s common stock, with an exercise price equal to the initial conversion price of each of the Notes, and a cap price of $106.76 per share of common stock, subject to certain adjustments under the terms of the Capped Calls.

By entering into the Capped Calls, the Company expects to reduce the potential dilution to its common stock (or, in the event a conversion of the Notes is settled in cash, to reduce its cash payment obligation) in the event that at the time of conversion of the Notes its common stock price exceeds the conversion price of the Notes.

The cost of the Capped Calls is not expected to be tax deductible as the Company did not elect to integrate the Capped Calls into the Notes for tax purposes.

Intangible Assets and Goodwill

12 Months Ended

Dec. 31, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

Intangible Assets and Goodwill

Note 10—Intangible Assets and Goodwill

The carrying value of intangible assets was as follows (in thousands):

	December 31, 2019
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Trade name	$	15,977	$	(10,124	)	$	5,853
Developed technology		42,558		(39,270	)		3,288
Customer relationships		31,783		(23,404	)		8,379
	$	90,318	$	(72,798	)	$	17,520

	December 31, 2018
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Trade name	$	15,977	$	(8,528	)	$	7,449
Developed technology		42,558		(34,472	)		8,086
Customer relationships		31,783		(19,533	)		12,250
	$	90,318	$	(62,533	)	$	27,785

Amortization expense is included in the following functional statements of operations expense categories. Amortization expense was as follows (in thousands):

	Year Ended December 31,
	2019		2018		2017
Cost of revenues	$	4,797	$	6,863	$	6,847
Sales and marketing		3,872		3,887		3,872
General and administrative		1,596		2,273		2,591
	$	10,265	$	13,023	$	13,310

The following table presents the Company’s estimate of remaining amortization expense for each of the five succeeding fiscal years and thereafter for finite-lived intangible assets at December 31, 2019 (in thousands):

2020	$	6,172
2021		5,011
2022		2,686
2023		2,154
2024		855
Thereafter		642
	$	17,520

There were no changes in the carrying amount of goodwill for the years ended December 31, 2019, 2018, and 2017.

Income Taxes

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

Income Taxes

Note 11—Income Taxes

The amounts in the tables below reflect the revisions as discussed in Note 2, “Significant Accounting Policies”.

The components of income (loss) before income taxes were as follows (in thousands):

	Year Ended December 31,
	2019			2018			2017
United States	$	(33,940	)	$	(30,967	)	$	(31,794	)
International		3,519			3,263			(1,049	)
	$	(30,421	)	$	(27,704	)	$	(32,843	)

The components of the total provision for income taxes were as follows (in thousands):

	Year Ended December 31,
	2019		2018		2017
Current
Federal	$	—	$	—	$	—
State		59		24		51
Foreign		352		835		429
Total current tax expense		411		859		480
Deferred
Federal		—		—		—
State		—		—		—
Foreign		1,314		213		85
Total deferred tax provision		1,314		213		85
Total provision for income taxes	$	1,725	$	1,072	$	565

A reconciliation of the statutory U.S. federal income tax rate to the Company’s effective tax rate for the years ended December 31, 2019, 2018, and 2017 was as follows:

	Year Ended December 31,
	2019			2018			2017
Federal statutory income tax rate		21.0	%		21.0	%		34.0	%
State tax, net of federal benefit		(0.2	%)		(0.1	%)		(0.1	%)
Federal tax credits		5.8	%		6.4	%		3.3	%
Change in valuation allowance		(34.1	%)		(61.2	%)		(13.6	%)
Common stock warrants		—			—			(3.7	%)
Foreign tax differential		(4.8	%)		(5.1	%)		(3.5	%)
Windfall tax benefits, net related to stock-based compensation		11.2	%		40.2	%		15.3	%
Effect of rate and other changes on federal deferred taxes, net due to enactment of Tax Cuts and Jobs Act		—			—			(30.0	%)
Nondeductible officer compensation		(2.8	%)		(1.8	%)		—
Nondeductible meals and entertainment		(1.9	%)		(1.7	%)		—
Other		0.1	%		(1.6	%)		(3.4	%)
		(5.7	%)		(3.9	%)		(1.7	%)

Significant components of the Company’s deferred tax assets and liabilities were as follows (in thousands):

	December 31,
	2019			2018
Deferred tax assets
Net operating loss carryforwards	$	49,310		$	44,422
Business credits		12,479			8,279
Stock-based compensation		7,155			5,839
Operating leases		3,263			—
Accrued expenses and other current liabilities		2,974			2,394
Other		358			1,192
Total deferred tax assets		75,539			62,126
Less: valuation allowance		(30,598	)		(45,173	)
Deferred tax assets, net of valuation allowance		44,941			16,953
Deferred tax liabilities
Convertible notes		(25,510	)		—
Intangible assets		(6,040	)		(8,735	)
Prepaid expenses		(15,163	)		(10,676	)
Property and equipment		(186	)		(801	)
Right-of-Use asset		(2,559	)		—
Other		(54	)		2
Total deferred tax liabilities		(49,512	)		(20,210	)
Net deferred taxes	$	(4,571	)	$	(3,257	)

ASC 740 requires that the tax benefit of net operating losses, temporary differences, and credit carryforwards be recorded as an asset to the extent that management assesses that realization is "more likely than not." A valuation allowance is recorded when it is more likely than not that some of the deferred tax assets will not be realized. Realization of future tax benefits is dependent on the Company’s ability to generate sufficient taxable income within the carryforward period. For financial reporting purposes, the Company has incurred losses for each of the past three years. Based on available objective evidence, including the Company’s history of losses, management believes it is more likely than not that the net deferred tax assets will not be fully realizable. Accordingly, the Company provided a valuation allowance against certain deferred tax assets. The net deferred tax liability position at December 31, 2019 was related to the Company’s foreign tax jurisdictions.

The changes in the valuation allowance were as follows (in thousands).

	Year Ended December 31,
	2019			2018		2017
Valuation allowance, at beginning of year	$	45,173		$	23,904	$	2,674
Increase in valuation allowance recorded through earnings		12,808			21,269		7,332
Decrease in valuation allowance recorded through equity		(27,383	)		—		—
Increase in valuation allowance as result of adoption of ASU 2016-09		—			—		13,898
Valuation allowance, at end of year	$	30,598		$	45,173	$	23,904

The Company did not provide for U.S. income taxes on the undistributed earnings and other outside temporary differences of foreign subsidiaries as they are considered indefinitely reinvested outside the United States. At December 31, 2019 and 2018, the amount of temporary differences related to undistributed earnings and other outside temporary differences upon which U.S. income taxes have not been provided is immaterial to these consolidated financial statements.

At December 31, 2019, the Company had consolidated federal and state net operating loss carryforwards available to offset future taxable income of approximately $199.0 million and $99.9 million, respectively. The federal losses will begin to expire in 2033, and the state losses will begin to expire between 2023 and 2033, depending on the jurisdiction. The Company has federal research and development credits and foreign tax credits of $4.8 million and $2.2 million,

respectively, which begin to expire in 2033 and 2023, respectively. The Company has state research and development credits and enterprise zone credits of $5.0 million and $0.6 million, respectively, which are indefinite in expiration and begin to expire in 2023, respectively. Pursuant to Internal Revenue Code Section 382, use of the Company’s net operating loss carryforwards may be limited if the Company experiences a cumulative change in ownership of more than 50% over a three-year period.

The following is a rollforward of the Company’s total gross unrecognized tax benefits (in thousands):

	Year Ended December 31,
	2019		2018		2017
Beginning gross unrecognized tax benefits	$	1,223	$	672	$	382
Increases related to prior year tax positions		134		130		38
Increases related to current year tax positions		380		421		252
Ending gross unrecognized tax benefits	$	1,737	$	1,223	$	672

At December 31, 2019, the realization of unrecognized tax benefits were not expected to impact the effective rate due to a full valuation allowance on federal and state deferred taxes. The Company has not recorded any interest or penalties in its provision for income taxes for the years ended December 31, 2019, 2018, and 2017 and no such amounts have been accrued at December 31, 2019 and 2018.

The Company files U.S. federal, various state, and foreign income tax returns. In the normal course of business, the Company is subject to examination by taxing authorities. The tax years from 2013 forward remain subject to examination for federal purposes. Generally, state and foreign tax authorities may examine the Company’s tax returns for four years and five years, respectively, from the date an income tax return is filed. However, the taxing authorities may continue to examine the Company’s federal and state net operating loss carryforwards until the statute of limitations closes on the tax years in which the federal and state net operating losses are utilized.

The Company does not anticipate material changes in the total amount or composition of its unrecognized tax benefits within 12 months of the reporting date.

Net Loss per Share

12 Months Ended

Dec. 31, 2019

Earnings Per Share [Abstract]

Net Loss per Share

Note 12—Net Loss per Share

The following table sets forth the computation of basic and diluted net loss per share (in thousands, except per share amounts):

	Year Ended December 31,
	2019			2018			2017
Numerator:
Net loss attributable to BlackLine, Inc.	$	(32,535	)	$	(28,714	)	$	(33,408	)
Denominator:
Weighted average shares		55,320			53,912			52,161
Add: Dilutive effect of securities		—			—			—
Shares used to calculate diluted net loss per share		55,320			53,912			52,161
Basic net loss per share attributable to BlackLine, Inc.	$	(0.59	)	$	(0.53	)	$	(0.64	)
Diluted net loss per share attributable to BlackLine, Inc.	$	(0.59	)	$	(0.53	)	$	(0.64	)

The following potentially dilutive shares were excluded from the calculation of diluted net loss per share attributable to common stockholders because they were anti-dilutive:

	Year Ended December 31,
	2019		2018		2017
Stock options with service-only vesting conditions		3,486		3,820		5,019
Stock options with performance conditions		683		683		683
Restricted stock units		1,654		1,300		2
Total shares excluded from net loss per share		5,823		5,803		5,704

Additionally, approximately 6.8 million shares underlying the conversion option in the Notes are not considered in the calculation of diluted net loss per share as the effect would be anti-dilutive. The shares are subject to adjustment, up to approximately 9.4 million shares for the Notes, if certain corporate events occur prior to the maturity date or if the Company issues a notice of redemption. The Company uses the treasury stock method for calculating any potential dilutive effect of the conversion option on diluted net income per share, if applicable. During the year ended December 31, 2019, the average market price of the Company’s common stock did not exceed the conversion price of the Notes of $73.40 per share.

Contingent Consideration

12 Months Ended

Dec. 31, 2019

Business Combination Contingent Consideration Arrangements [Abstract]

Contingent Consideration

Note 13—Contingent Consideration

In conjunction with the 2013 Acquisition, option holders of BlackLine Systems, Inc. were allowed to cancel their stock option rights and receive a cash payment equal to the amount of calculated gain (less applicable expense and other items) had they exercised their stock options and then sold their common shares as part of the 2013 Acquisition. As a condition of the 2013 Acquisition, the Company is required to pay additional cash consideration to certain equity holders if the Company realizes a tax benefit from the use of net operating losses generated from the stock option exercises concurrent with the 2013 Acquisition. The maximum contingent cash consideration to be distributed is $8.0 million. The fair value of the contingent consideration was $6.4 million and $6.3 million at December 31, 2019 and 2018, respectively. See Note 2 for additional information regarding the valuation of the contingent consideration.

Commitments and Contingencies

12 Months Ended

Dec. 31, 2019

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

Note 14—Commitments and Contingencies

Purchase obligations— At December 31, 2019, the Company had $16.8 million of non-cancelable purchase obligations primarily related to future sales and user conferences and software agreements.

Litigation—From time to time, the Company may become subject to legal proceedings, claims and litigation arising in the ordinary course of business. The Company is not currently a party to any legal proceedings, nor is it aware of any pending or threatened litigation, that would have a material adverse effect on the Company’s business, operating results, cash flows, or financial condition should such litigation be resolved unfavorably.

Indemnification—In the ordinary course of business, the Company may provide indemnification of varying scope and terms to customers, vendors, investors, directors, and officers with respect to certain matters, including, but not limited to, losses arising out of its breach of such agreements, services to be provided by the Company, or from intellectual property infringement claims made by third parties. These indemnification provisions may survive termination of the underlying agreement and the maximum potential amount of future payments the Company could be required to make under these indemnification provisions may not be subject to maximum loss clauses. The maximum potential amount of future payments the Company could be required to make under these indemnification provisions is indeterminable. The Company has never paid a material claim, nor has it been sued in connection with these indemnification arrangements. At December 31, 2019 and 2018, the Company has not accrued a liability for these indemnification arrangements because the likelihood of incurring a payment obligation, if any, in connection with these indemnification arrangements was not probable or reasonably estimable.

Equity Awards

12 Months Ended

Dec. 31, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Equity Awards

Note 15—Equity Awards

2014 and 2016 Plans

On March 3, 2014, the Company adopted the 2014 Stock Incentive Plan (the “2014 Plan”). In November 2016, upon the completion of the Company’s initial public offering, the Company adopted the 2016 Equity Incentive Plan (the “2016 Plan”) and determined that it will no longer grant any additional awards under the 2014 Plan. However, the 2014 Plan continues to govern the terms and conditions of the outstanding awards previously granted under the 2014 plan. Upon the adoption of the 2016 Plan, the maximum number of shares issuable was 6.2 million, plus a number of shares equal to the number of shares subject to outstanding awards granted under the 2014 Plan after the date the 2014 Plan is terminated without having been exercised in full. The Company’s board of directors may grant stock options and restricted stock units to employees, directors and consultants under the 2016 Plan. The aggregate number of shares available under the 2016 Plan and the number of shares subject to outstanding options automatically adjusts for any changes in the Company’s outstanding common stock by reason of any recapitalization, spin-off, reorganization, reclassification, stock dividend, stock split, reverse stock split, or similar transaction. Stock options and restricted stock units generally vest over four years and have contractual terms of ten years.

In May 2017, warrants to purchase 499,999 shares of common stock were net exercised resulting in the issuance of 428,033 shares of common stock and, accordingly, there will be no further changes in the fair value.

At December 31, 2019, 10.8 million shares were available for issuance under the 2016 Plan.

Stock options with service-only vesting conditions

A summary of the Company’s stock option activity and related information for awards that contain service-only vesting conditions was as follows:

	Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term		Aggregate Intrinsic Value
	(in thousands)					(in years)		(in thousands)
Outstanding at December 31, 2018		3,820		$	21.85		7.5	$	75,287
Granted		480		$	49.24
Exercised		(710	)	$	15.44
Forfeited/canceled		(104	)	$	22.09
Outstanding at December 31, 2019		3,486		$	26.92		7.0	$	85,983
Exercisable at December 31, 2019		2,019		$	18.43

The weighted average grant date fair value per share of options granted during the years ended December 31, 2019, 2018, and 2017 that contain service only vesting conditions were $23.40, $20.15, and $15.20, respectively. The aggregate intrinsic value of options exercised that contain service only vesting conditions during the years ended December 31, 2019, 2018, and 2017 were $25.6 million, $66.7 million, and $31.4 million, respectively. Cash received from the exercise of stock options for the years ended December 31, 2019, 2018, and 2017 was $10.6 million, $14.0 million, and $10.4 million, respectively.

Unrecognized compensation expense relating to stock options that contain service only vesting conditions was $22.2 million at December 31, 2019, which is expected to be recognized over a weighted-average period of 2.5 years.

Stock options with performance conditions

In October 2016, the Company granted options to purchase 682,800 shares of common stock at an exercise price of $14.00 per share to two executive officers that vest upon meeting certain performance conditions and continued service. The performance conditions include meeting yearly cash flow targets and cumulative annual recurring revenue targets through 2019. If each yearly cash flow target is met through 2019, but the full cumulative annual recurring target through 2019 is not met, the executive officers are still able to vest in the award if an additional cash flow target for 2020 and a cumulative annual recurring revenue target through 2020 are achieved. The cash flow performance targets for the final year were set during the quarter ended March 31, 2019, resulting in a grant date being established. The total fair value of the awards at grant date was approximately $24.0 million. At December 31, 2019, the Company has determined that the

achievement of the performance targets is not probable and, accordingly, no stock-based compensation expense has been recorded for these awards. To the extent that the awards become probable of vesting prior to the grant date, the amount of compensation cost to be recognized will be based on the then fair value of the options. The fair value of the options will be remeasured each period until a grant date has been established. Accordingly, stock-based compensation cost, if any, to be recognized will depend on the value of the stock options when all performance conditions have been set and whether the performance conditions are probable of being achieved.

Restricted stock units

The following table summarizes activity for restricted stock units:

				Weighted-Average
	Restricted			Grant Date
	Stock Units			Fair Value
	(in thousands)
Nonvested at December 31, 2018		1,300		$	42.29
Granted		961		$	49.55
Vested		(474	)	$	42.80
Forfeited/canceled		(133	)	$	46.08
Nonvested at December 31, 2019		1,654		$	46.05

At December 31, 2019, the intrinsic value of nonvested restricted stock units was $85.3 million. At December 31, 2019, total unrecognized compensation cost related to nonvested restricted stock units was $65.0 million and was expected to be recognized over a weighted-average period of 2.9 years.

Employee Stock Purchase Plan

Under the Company’s 2018 Employee Stock Purchase Plan (“ESPP”) eligible employees are granted the right to purchase shares at the lower of 85% of the fair value of the stock at the time of grant or 85% of the fair value at the time of exercise. The right to purchase shares is granted twice yearly for six month offering periods in May and November and exercisable on or about the succeeding November and May, respectively, of each year. Under the ESPP, 1.3 million shares remained available for issuance, at December 31, 2019. The Company recognized stock-based compensation expense related to the ESPP of $2.1 million and $0.2 million for the years ended December 31, 2019 and 2018, respectively.

The fair value of ESPP shares granted was estimated using the Black-Scholes option pricing model with the following weighted-average assumptions:

	Year Ended December 31,
	2019	2018
Risk-free interest rate	1.6 - 2.4 %	2.6%
Expected term (in years)	0.5 - 1		0.7
Volatility	39.3 - 54.3 %	42.9%

At December 31, 2019, total unrecognized compensation cost related to the 2018 ESPP was $2.3 million and was expected to be recognized over a weighted-average period of approximately one year.

Stock-based compensation expense

Stock-based compensation expense recorded in the Company’s consolidated statements of operations was as follows (in thousands):

	Year Ended December 31,
	2019		2018		2017
Cost of revenues	$	4,814	$	3,265	$	1,149
Sales and marketing		15,389		8,674		10,811
Research and development		4,729		2,570		767
General and administrative		9,120		6,386		3,317
	$	34,052	$	20,895	$	16,044

Stock-based compensation capitalized as an asset was $0.5 million, $0.4 million, and $0.1 million in the years ended December 31, 2019, 2018, and 2017, respectively.

The Company recorded $0.1 million and $0.2 million of foreign tax benefits attributable to equity awards for the years ended December 31, 2019 and 2018, respectively. For the year ended December 31, 2017, no additional tax benefit attributable to equity awards was recorded due to the full valuation allowance provided on the Company’s U.S. net deferred tax assets.

On July 21, 2017, the Company modified the vesting terms of options to purchase 219,000 shares of common stock to a time-based vesting schedule, for eight employees. Prior to the modification, the options vested solely upon a change in control of the Company. The Company recorded $6.6 million of stock-based compensation in the year ended December 31, 2017 related to the modification.

Defined Contribution Plan

12 Months Ended

Dec. 31, 2019

Compensation And Retirement Disclosure [Abstract]

Defined Contribution Plan

Note 16—Defined Contribution Plan

The Company sponsors a defined contribution retirement plan (the “Plan”) that covers substantially all domestic employees. The Company makes matching contributions of 100% of each $1 of the employee’s contribution up to the first 3% of the employee’s bi-weekly compensation and 50% of each $1 of the employee’s contribution up to the next 2% of the employee’s bi-weekly compensation. Matching contributions to the Plan recorded in the Company’s consolidated statements of operations totaled $3.6 million, $2.9 million, and $2.2 million for the years ended December 31, 2019, 2018, and 2017, respectively.

Geographic Information

12 Months Ended

Dec. 31, 2019

Segment Reporting [Abstract]

Geographic Information

Note 17—Geographic Information

The following table sets forth the Company’s long-lived assets, which consist of property and equipment, net, and operating lease right-of-use assets by geographic region (in thousands):

	Year Ended December 31,
	2019		2018
United States	$	20,848	$	12,407
International		4,725		1,129
	$	25,573	$	13,536

Subsequent Events

12 Months Ended

Dec. 31, 2019

Subsequent Events [Abstract]

Subsequent Events

Note 18—Subsequent Events

On February 19, 2020, the Compensation Committee of the Board of Directors of BlackLine, Inc. approved restricted stock unit grants to employees totaling 0.1 million shares. Each restricted stock unit entitles the recipient to receive one share of common stock upon vesting of the award. The vast majority of the restricted stock units will vest as to one-fourth of the total number of units awarded on the first anniversary of February 20, 2020 and quarterly thereafter for 12 consecutive quarters.

Unaudited Quarterly Data

12 Months Ended

Dec. 31, 2019

Quarterly Financial Information Disclosure [Abstract]

Unaudited Quarterly Data

Note 19—Unaudited Quarterly Data

The following table sets forth unaudited quarterly consolidated statements of operations data for each of the quarters in the years ended December 31, 2019 and 2018. The Company has prepared the unaudited quarterly consolidated statements of operations data on a basis consistent with the audited annual consolidated financial statements. In the opinion of management, the financial information in this table reflects all adjustments, consisting of normal and recurring adjustments, necessary for the fair statement of this data. The amounts below reflect the revisions as discussed in Note 2, “Significant Accounting Policies”, and the 2019 amounts will be revised for interim periods in future filings and were not material to the previously-issued financial statements.

	Quarter Ended
	2019												2018
	December 31,			September 30,			June 30,			March 31,			December 31,			September 30,			June 30,			March 31,
Revenues	$	80,258		$	74,925		$	69,664		$	64,129		$	62,316		$	58,734		$	55,454		$	51,284
Gross profit	$	65,137		$	59,633		$	54,720		$	50,511		$	48,431		$	45,217		$	43,588		$	39,678
Net loss	$	(8,712	)	$	(8,876	)	$	(5,527	)	$	(9,031	)	$	(8,205	)	$	(4,766	)	$	(8,553	)	$	(7,252	)
Net loss attributable to non-controlling interest	$	(466	)	$	(509	)	$	(219	)	$	(250	)	$	(62	)	$	—		$	—		$	—
Adjustment attributable to non-controlling interest	$	940		$	839		$	54		$	—		$	—		$	—		$	—		$	—
Net loss attributable to BlackLine, Inc.	$	(9,186	)	$	(9,206	)	$	(5,362	)	$	(8,781	)	$	(8,143	)	$	(4,766	)	$	(8,553	)	$	(7,252	)
Basic net loss per share attributable to BlackLine, Inc.	$	(0.16	)	$	(0.17	)	$	(0.10	)	$	(0.16	)	$	(0.15	)	$	(0.09	)	$	(0.16	)	$	(0.14	)
Diluted net loss per share attributable to BlackLine, Inc.	$	(0.16	)	$	(0.17	)	$	(0.10	)	$	(0.16	)	$	(0.15	)	$	(0.09	)	$	(0.16	)	$	(0.14	)

The tables below reflect the impact of the revisions on the unaudited quarterly data as discussed in Note 2, “Significant Accounting Policies.” The revision of the unaudited quarterly financial statements for the quarter ended March 31, 2019, the quarter and six months ended June 30, 2019, and the quarter and nine months ended September 30, 2019 will be effected in connection with the Company’s 2020 Form 10-Q filings.

	Quarter Ended March 31, 2018
	As Previously Reported			Adjustments			As Revised
	(in thousands, except per share data)
Net loss	$	(7,155	)	$	(97	)	$	(7,252	)
Net loss attributable to BlackLine, Inc.	$	(7,155	)	$	(97	)	$	(7,252	)
Basic net loss per share attributable to BlackLine, Inc.	$	(0.13	)	$	(0.01	)	$	(0.14	)
Diluted net loss per share attributable to BlackLine, Inc.	$	(0.13	)	$	(0.01	)	$	(0.14	)

	Quarter Ended June 30, 2018
	As Previously Reported			Adjustments			As Revised
	(in thousands, except per share data)
Net loss	$	(8,457	)	$	(96	)	$	(8,553	)
Net loss attributable to BlackLine, Inc.	$	(8,457	)	$	(96	)	$	(8,553	)

	Quarter Ended September 30, 2018
	As Previously Reported			Adjustments			As Revised
	(in thousands, except per share data)
Net loss	$	(4,460	)	$	(306	)	$	(4,766	)
Net loss attributable to BlackLine, Inc.	$	(4,460	)	$	(306	)	$	(4,766	)
Basic net loss per share attributable to BlackLine, Inc.	$	(0.08	)	$	(0.01	)	$	(0.09	)
Diluted net loss per share attributable to BlackLine, Inc.	$	(0.08	)	$	(0.01	)	$	(0.09	)

	Quarter Ended December 31, 2018
	As Previously Reported			Adjustments			As Revised
	(in thousands, except per share data)
Net loss	$	(7,794	)	$	(411	)	$	(8,205	)
Net loss attributable to BlackLine, Inc.	$	(7,732	)	$	(411	)	$	(8,143	)
Basic net loss per share attributable to BlackLine, Inc.	$	(0.14	)	$	(0.01	)	$	(0.15	)
Diluted net loss per share attributable to BlackLine, Inc.	$	(0.14	)	$	(0.01	)	$	(0.15	)

	Quarter Ended March 31, 2019
	As Previously Reported			Adjustments			As Revised
	(in thousands, except per share data)
Net loss	$	(8,833	)	$	(198	)	$	(9,031	)
Net loss attributable to BlackLine, Inc.	$	(8,583	)	$	(198	)	$	(8,781	)

	Quarter Ended June 30, 2019
	As Previously Reported			Adjustments			As Revised
	(in thousands, except per share data)
Net loss	$	(5,390	)	$	(137	)	$	(5,527	)
Net loss attributable to BlackLine, Inc.	$	(5,225	)	$	(137	)	$	(5,362	)
Basic net loss per share attributable to BlackLine, Inc.	$	(0.09	)	$	(0.01	)	$	(0.10	)
Diluted net loss per share attributable to BlackLine, Inc.	$	(0.09	)	$	(0.01	)	$	(0.10	)

	Quarter Ended September 30, 2019
	As Previously Reported			Adjustments		As Revised
	(in thousands, except per share data)
Net loss	$	(8,912	)	$	36	$	(8,876	)
Net loss attributable to BlackLine, Inc.	$	(9,242	)	$	36	$	(9,206	)

Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Principles of Consolidation and Basis of Presentation

Principles of consolidation and basis of presentation

Revision of Previously Issued Financial Statements

Revision of Previously-Issued Financial Statements

Consolidated Balance Sheet
	December 31, 2018
	As Previously Reported			Adjustments			As Revised
	(in thousands)
Other assets	$	36,865		$	(387	)	$	36,478
Total assets	$	493,868		$	(387	)	$	493,481
Accrued expenses and other current liabilities	$	24,705		$	(226	)	$	24,479
Total current liabilities	$	159,229		$	(226	)	$	159,003
Deferred tax liabilities, net	$	1,116		$	2,141		$	3,257
Total liabilities	$	167,912		$	1,915		$	169,827
Accumulated deficit	$	(130,594	)	$	(2,302	)	$	(132,896	)
Total stockholders' equity	$	321,569		$	(2,302	)	$	319,267
Total liabilities and stockholders' equity	$	493,868		$	(387	)	$	493,481

Consolidated Statements of Operations
	Year Ended December 31, 2018
	As Previously Reported			Adjustments			As Revised
	(in thousands, except per share data)
Provision for income taxes	$	162		$	910		$	1,072
Net loss	$	(27,866	)	$	(910	)	$	(28,776	)
Net loss attributable to BlackLine, Inc.	$	(27,804	)	$	(910	)	$	(28,714	)
Basic net loss per share attributable to BlackLine, Inc.	$	(0.52	)	$	(0.01	)	$	(0.53	)
Diluted net loss per share attributable to BlackLine, Inc.	$	(0.52	)	$	(0.01	)	$	(0.53	)

	Year Ended December 31, 2017
	As Previously Reported			Adjustments			As Revised
	(in thousands, except per share data)
Provision for income taxes	$	208		$	357		$	565
Net loss	$	(33,051	)	$	(357	)	$	(33,408	)
Net loss attributable to BlackLine, Inc.	$	(33,051	)	$	(357	)	$	(33,408	)
Basic net loss per share attributable to BlackLine, Inc.	$	(0.63	)	$	(0.01	)	$	(0.64	)
Diluted net loss per share attributable to BlackLine, Inc.	$	(0.63	)	$	(0.01	)	$	(0.64	)

Consolidated Statements of Comprehensive Loss
	Year Ended December 31, 2018
	As Previously Reported			Adjustments			As Revised
	(in thousands)
Net loss	$	(27,866	)	$	(910	)	$	(28,776	)
Comprehensive loss	$	(27,626	)	$	(910	)	$	(28,536	)
Comprehensive loss attributable to BlackLine, Inc.	$	(27,696	)	$	(910	)	$	(28,606	)

	Year Ended December 31, 2017
	As Previously Reported			Adjustments			As Revised
	(in thousands)
Net loss	$	(33,051	)	$	(357	)	$	(33,408	)
Comprehensive loss	$	(33,073	)	$	(357	)	$	(33,430	)
Comprehensive loss attributable to BlackLine, Inc.	$	(33,073	)	$	(357	)	$	(33,430	)

Consolidated Statements of Stockholders' Equity
	Year Ended December 31, 2018
	As Previously Reported			Adjustments			As Revised
Accumulated Deficit	(in thousands)
Balance at December 31, 2017	$	(102,790	)	$	(1,392	)	$	(104,182	)
Net loss attributable to BlackLine, Inc.	$	(27,804	)	$	(910	)	$	(28,714	)
Balance at December 31, 2018	$	(130,594	)	$	(2,302	)	$	(132,896	)
Total Equity
Balance at December 31, 2017	$	317,305		$	(1,392	)	$	315,913
Net loss attributable to BlackLine, Inc.	$	(27,804	)	$	(910	)	$	(28,714	)
Balance at December 31, 2018	$	321,569		$	(2,302	)	$	319,267

	Year Ended December 31, 2017
	As Previously Reported			Adjustments			As Revised
Accumulated Deficit	(in thousands)
Balance at December 31, 2016	$	(69,667	)	$	(1,035	)	$	(70,702	)
Balance at January 1, 2017	$	(69,739	)	$	(1,035	)	$	(70,774	)
Net loss attributable to BlackLine, Inc.	$	(33,051	)	$	(357	)	$	(33,408	)
Balance at December 31, 2017	$	(102,790	)	$	(1,392	)	$	(104,182	)
Total Equity
Balance at December 31, 2016	$	309,077		$	(1,035	)	$	308,042
Balance at January 1, 2017	$	309,077		$	(1,035	)	$	308,042
Net loss attributable to BlackLine, Inc.	$	(33,051	)	$	(357	)	$	(33,408	)
Balance at December 31, 2017	$	317,305		$	(1,392	)	$	315,913

Consolidated Statements of Cash Flows
	Year Ended December 31, 2018
	As Previously Reported			Adjustments			As Revised
	(in thousands)
Net loss attributable to BlackLine, Inc.	$	(27,804	)	$	(910	)	$	(28,714	)
Net loss	$	(27,866	)	$	(910	)	$	(28,776	)
Deferred income taxes	$	(923	)	$	1,136		$	213
Accrued expenses and other current liabilities	$	4,417		$	(226	)	$	4,191

	Year Ended December 31, 2017
	As Previously Reported			Adjustments			As Revised
	(in thousands)
Net loss attributable to BlackLine, Inc.	$	(33,051	)	$	(357	)	$	(33,408	)
Net loss	$	(33,051	)	$	(357	)	$	(33,408	)
Deferred income taxes	$	(272	)	$	357		$	85

Leases

On January 1, 2019, the Company adopted Accounting Standards Codification No. 842, Leases, on a modified retrospective basis.

Redeemable Non-controlling Interest

Redeemable non-controlling interest

Convertible Senior Notes

Use of Estimates

Use of estimates

Segments

Cash and Cash Equivalents

Cash and cash equivalents

Restricted Cash

Restricted cash

Investments in Marketable Securities

The Company classifies its investments in marketable securities in current assets as the investments are available for use, if needed, in current operations.

Accounts Receivable and Allowance for Doubtful Accounts

Accounts receivable and allowance for doubtful accounts

Concentration of Credit Risk and Significant Customers

Concentration of credit risk and significant customers

Property and Equipment

Property and equipment

Capitalized Internal-Use Software Costs

Capitalized internal-use software costs

Intangible Assets

Intangible assets

Impairment of Long-Lived Assets

Impairment of long-lived assets

Goodwill

Fair Value of Financial Instruments

Fair value of financial instruments

Level 1:

Quoted prices in active markets for identical or similar assets and liabilities.

Level 2:

Level 3:

Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

Revenue Recognition

Revenue recognition

The Company determines revenue recognition through the following steps:

•

Identification of the contract, or contracts, with a customer

•

Identification of the performance obligations in the contract

•

Determination of the transaction price

•

Allocation of the transaction price to the performance obligations in the contract

•

Recognition of revenue when, or as, the Company satisfies a performance obligation

offerings for which the Company has been paid in advance and earns the revenue when the Company transfers control of the product or service.

Fees are generally due and payable upon receipt of invoice or within 30 days. None of the Company’s contracts include a significant financing component.

Cost of Revenues

Cost of revenues

Sales and Marketing

Sales and marketing

Research and Development

Research and development

General and Administrative

General and administrative

Stock-Based Compensation

Stock-based compensation

The assumptions and estimates are as follows:

Estimated dividend yield. The estimated dividend yield is zero, as the Company does not currently intend to declare dividends in the foreseeable future.

The following information represents the weighted average of the assumptions used in the Black-Scholes option-pricing model for stock options granted:

	Year Ended December 31,
	2019		2018		2017
Expected term (years)		6.1		6.1		6.2
Expected volatility	46.7%		46.0%		47.0%
Risk free interest rate	2.2%		2.8%		2.1%
Expected dividend yield		—		—		—

Income Taxes

Income taxes

Net Loss Per Share

Net loss per share

Foreign Currency

Foreign currency

Recent- Accounting Pronouncements

Recent accounting pronouncements

Recently issued accounting pronouncements not yet adopted

Recently adopted accounting pronouncements

Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Summary of Reclassifications and Revisions for Financial Statement Line Items Adjusted in Affected Periods

Consolidated Balance Sheet
	December 31, 2018
	As Previously Reported			Adjustments			As Revised
	(in thousands)
Other assets	$	36,865		$	(387	)	$	36,478
Total assets	$	493,868		$	(387	)	$	493,481
Accrued expenses and other current liabilities	$	24,705		$	(226	)	$	24,479
Total current liabilities	$	159,229		$	(226	)	$	159,003
Deferred tax liabilities, net	$	1,116		$	2,141		$	3,257
Total liabilities	$	167,912		$	1,915		$	169,827
Accumulated deficit	$	(130,594	)	$	(2,302	)	$	(132,896	)
Total stockholders' equity	$	321,569		$	(2,302	)	$	319,267
Total liabilities and stockholders' equity	$	493,868		$	(387	)	$	493,481

Consolidated Statements of Operations
	Year Ended December 31, 2018
	As Previously Reported			Adjustments			As Revised
	(in thousands, except per share data)
Provision for income taxes	$	162		$	910		$	1,072
Net loss	$	(27,866	)	$	(910	)	$	(28,776	)
Net loss attributable to BlackLine, Inc.	$	(27,804	)	$	(910	)	$	(28,714	)
Basic net loss per share attributable to BlackLine, Inc.	$	(0.52	)	$	(0.01	)	$	(0.53	)
Diluted net loss per share attributable to BlackLine, Inc.	$	(0.52	)	$	(0.01	)	$	(0.53	)

	Year Ended December 31, 2017
	As Previously Reported			Adjustments			As Revised
	(in thousands, except per share data)
Provision for income taxes	$	208		$	357		$	565
Net loss	$	(33,051	)	$	(357	)	$	(33,408	)
Net loss attributable to BlackLine, Inc.	$	(33,051	)	$	(357	)	$	(33,408	)
Basic net loss per share attributable to BlackLine, Inc.	$	(0.63	)	$	(0.01	)	$	(0.64	)
Diluted net loss per share attributable to BlackLine, Inc.	$	(0.63	)	$	(0.01	)	$	(0.64	)

Consolidated Statements of Comprehensive Loss
	Year Ended December 31, 2018
	As Previously Reported			Adjustments			As Revised
	(in thousands)
Net loss	$	(27,866	)	$	(910	)	$	(28,776	)
Comprehensive loss	$	(27,626	)	$	(910	)	$	(28,536	)
Comprehensive loss attributable to BlackLine, Inc.	$	(27,696	)	$	(910	)	$	(28,606	)

	Year Ended December 31, 2017
	As Previously Reported			Adjustments			As Revised
	(in thousands)
Net loss	$	(33,051	)	$	(357	)	$	(33,408	)
Comprehensive loss	$	(33,073	)	$	(357	)	$	(33,430	)
Comprehensive loss attributable to BlackLine, Inc.	$	(33,073	)	$	(357	)	$	(33,430	)

Consolidated Statements of Stockholders' Equity
	Year Ended December 31, 2018
	As Previously Reported			Adjustments			As Revised
Accumulated Deficit	(in thousands)
Balance at December 31, 2017	$	(102,790	)	$	(1,392	)	$	(104,182	)
Net loss attributable to BlackLine, Inc.	$	(27,804	)	$	(910	)	$	(28,714	)
Balance at December 31, 2018	$	(130,594	)	$	(2,302	)	$	(132,896	)
Total Equity
Balance at December 31, 2017	$	317,305		$	(1,392	)	$	315,913
Net loss attributable to BlackLine, Inc.	$	(27,804	)	$	(910	)	$	(28,714	)
Balance at December 31, 2018	$	321,569		$	(2,302	)	$	319,267

	Year Ended December 31, 2017
	As Previously Reported			Adjustments			As Revised
Accumulated Deficit	(in thousands)
Balance at December 31, 2016	$	(69,667	)	$	(1,035	)	$	(70,702	)
Balance at January 1, 2017	$	(69,739	)	$	(1,035	)	$	(70,774	)
Net loss attributable to BlackLine, Inc.	$	(33,051	)	$	(357	)	$	(33,408	)
Balance at December 31, 2017	$	(102,790	)	$	(1,392	)	$	(104,182	)
Total Equity
Balance at December 31, 2016	$	309,077		$	(1,035	)	$	308,042
Balance at January 1, 2017	$	309,077		$	(1,035	)	$	308,042
Net loss attributable to BlackLine, Inc.	$	(33,051	)	$	(357	)	$	(33,408	)
Balance at December 31, 2017	$	317,305		$	(1,392	)	$	315,913

Consolidated Statements of Cash Flows
	Year Ended December 31, 2018
	As Previously Reported			Adjustments			As Revised
	(in thousands)
Net loss attributable to BlackLine, Inc.	$	(27,804	)	$	(910	)	$	(28,714	)
Net loss	$	(27,866	)	$	(910	)	$	(28,776	)
Deferred income taxes	$	(923	)	$	1,136		$	213
Accrued expenses and other current liabilities	$	4,417		$	(226	)	$	4,191

	Year Ended December 31, 2017
	As Previously Reported			Adjustments			As Revised
	(in thousands)
Net loss attributable to BlackLine, Inc.	$	(33,051	)	$	(357	)	$	(33,408	)
Net loss	$	(33,051	)	$	(357	)	$	(33,408	)
Deferred income taxes	$	(272	)	$	357		$	85

Schedule of Weighted Average Assumptions

The following information represents the weighted average of the assumptions used in the Black-Scholes option-pricing model for stock options granted:

	Year Ended December 31,
	2019		2018		2017
Expected term (years)		6.1		6.1		6.2
Expected volatility	46.7%		46.0%		47.0%
Risk free interest rate	2.2%		2.8%		2.1%
Expected dividend yield		—		—		—

The fair value of ESPP shares granted was estimated using the Black-Scholes option pricing model with the following weighted-average assumptions:

	Year Ended December 31,
	2019	2018
Risk-free interest rate	1.6 - 2.4 %	2.6%
Expected term (in years)	0.5 - 1		0.7
Volatility	39.3 - 54.3 %	42.9%

Revenues (Tables)

12 Months Ended

Dec. 31, 2019

Revenue From Contract With Customer [Abstract]

Schedule of Disaggregation of Revenues by Geographic Region

The following table sets forth the Company’s revenues by geographic region (in thousands):

	Year Ended December 31,
	2019		2018		2017
United States	$	223,375	$	180,152	$	141,499
International		65,601		47,636		34,104
	$	288,976	$	227,788	$	175,603

Redeemable Non-Controlling Interest (Tables)

12 Months Ended

Dec. 31, 2019

Equity Method Investments And Joint Ventures [Abstract]

Summary of Redeemable Non-Controlling Interest

The following table summarizes the activity in the redeemable non-controlling interest for the periods indicated below:

	December 31,
	2019			2018
Balance at beginning of period	$	4,387		$	—
Investment by redeemable non-controlling interest		—			4,317
Net loss attributable to redeemable non-controlling interest (excluding adjustment to non-controlling interest)		(1,444	)		(62	)
Foreign currency translation		129			132
Adjustment to redeemable non-controlling interest		1,833			—
Balance at end of period	$	4,905		$	4,387

Balance Sheet Components (Tables)

12 Months Ended

Dec. 31, 2019

Balance Sheet Related Disclosures [Abstract]

Schedule of Investments in Marketable Securities

Investments in marketable securities presented within current assets on the consolidated balance sheet consisted of the following:

	December 31, 2019
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in thousands)
Marketable securities
U.S. treasury securities	$	382,269	$	67	$	(1	)	$	382,335
Corporate bonds		77,009		63		(18	)		77,054
Commercial paper		28,126		—		—			28,126
	$	487,404	$	130	$	(19	)	$	487,515

	December 31, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in thousands)
Marketable securities
U.S. treasury securities	$	25,856	$	—	$	(29	)	$	25,827
Corporate bonds		32,030		—		(60	)		31,970
Commercial paper		28,599		—		—			28,599
	$	86,485	$	—	$	(89	)	$	86,396

Summary of Amortized Cost and Fair Values of Marketable Securities, by Remaining Contractual Maturity

The amortized cost and fair values of marketable securities, by remaining contractual maturity, were as follows:

	December 31, 2019
	Amortized Cost		Fair Value
	(in thousands)
Maturing within 1 year	$	473,221	$	473,321
Maturing between 1 and 2 years		14,183		14,194
	$	487,404	$	487,515

Summary of Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consisted of the following (in thousands):

	December 31,
	2019		2018
Partner referral fees	$	833	$	5,219
Other prepaid expenses and other current assets		11,997		8,823
	$	12,830	$	14,042

Schedule of Other Assets

Other assets consisted of the following (in thousands):

	December 31,
	2019		2018
Deferred customer contract acquisition costs	$	49,709	$	34,172
Restricted cash		250		274
Capitalized software implementation costs		1,237		—
Other assets		1,687		2,032
	$	52,883	$	36,478

Schedule of Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consisted of the following (in thousands):

	December 31,
	2019		2018
Accrued salaries and employee benefits	$	20,775	$	17,054
Accrued income and other taxes payable		4,198		4,321
Short-term tenant improvement allowance		—		475
Other accrued expenses and current liabilities		5,125		2,629
	$	30,098	$	24,479

Leases (Tables)

12 Months Ended

Dec. 31, 2019

Lessee Disclosure [Abstract]

Summary of Lease Expense

The following table sets forth the Company’s lease expense (in thousands):

	Year Ended December 31, 2019
Operating lease cost	$	5,957
Short-term lease cost		875
Variable cost		630
Total lease cost	$	7,462

Summary of Supplemental Information Related to Leases

Supplemental information related to the Company’s leases was as follows (in thousands, except percentages):

Year Ended

December 31, 2019

Cash paid for amounts included in the measurement of lease liabilities - operating leases

6,613

	At December 31, 2019
Weighted-average remaining lease term - operating leases (in years)		4.2
Weighted-average discount rate - outstanding operating leases		6	%

Schedule of Maturities of Lease Liabilities and Future Minimum Lease Payments Under Non-cancelable Operating Leases

Maturities of lease liabilities at December 31, 2019 was (in thousands):

2020	$	5,674
2021		4,131
2022		3,067
2023		2,906
2024		473
Thereafter		1,191
Total lease payments		17,442
Less imputed interest		(1,898	)
Total	$	15,544

Future minimum lease payments under non-cancelable operating leases at December 31, 2018 was (in thousands):

2019	$	7,059
2020		5,307
2021		3,786
2022		2,586
2023		2,638
Thereafter		237
Total	$	21,613

Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2019

Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis

	December 31, 2019
	Level 1		Level 2		Level 3		Total
Cash equivalents
Money market funds	$	39,767	$	—	$	—	$	39,767
Marketable securities
U.S. treasury securities		382,335		—		—		382,335
Corporate bonds		—		77,054		—		77,054
Commercial paper		—		28,126		—		28,126
Total assets	$	422,102	$	105,180	$	—	$	527,282
Liabilities
Contingent consideration	$	—	$	—	$	6,362	$	6,362
Total liabilities	$	—	$	—	$	6,362	$	6,362

	December 31, 2018
	Level 1		Level 2		Level 3		Total
Cash equivalents
Money market funds	$	32,021	$	—	$	—	$	32,021
Marketable securities
U.S. treasury securities		25,827		—		—		25,827
Corporate bonds		—		31,970		—		31,970
Commercial paper		—		28,599		—		28,599
Total assets	$	57,848	$	60,569	$	—	$	118,417
Liabilities
Contingent consideration	$	—	$	—	$	6,316	$	6,316
Total liabilities	$	—	$	—	$	6,316	$	6,316

Contingent Consideration

Summary of Changes in Common Stock Warrant Liability and Contingent Consideration Liability

The following table summarizes the changes in the contingent consideration liability (in thousands):

	Year Ended December 31,
	2019		2018		2017
Beginning fair value	$	6,316	$	5,866	$	5,238
Change in fair value		46		450		628
Ending fair value	$	6,362	$	6,316	$	5,866

Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2019

Property Plant And Equipment [Abstract]

Schedule of Property and Equipment

Property and equipment consisted of the following (in thousands):

	December 31,
	2019			2018
Computers and equipment	$	10,547		$	6,598
Purchased software		7,745			7,356
Furniture and fixtures		2,606			2,571
Leasehold improvements		10,134			10,077
Construction in progress		528			—
		31,560			26,602
Less: accumulated depreciation and amortization		(18,536	)		(13,066	)
	$	13,024		$	13,536

Convertible Senior Notes (Tables)

12 Months Ended

Dec. 31, 2019

Debt Disclosure [Abstract]

Summary of Notes

The Notes consisted of the following (in thousands):

	December 31, 2019
Liability:
Principal	$	500,000
Unamortized debt discount and issuance costs		(115,657	)
Net carrying amount	$	384,343
Carrying amount of the equity component	$	111,230

Intangible Assets and Goodwill (Tables)

12 Months Ended

Dec. 31, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

Summary of Carrying Value of Intangible Assets

The carrying value of intangible assets was as follows (in thousands):

	December 31, 2019
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Trade name	$	15,977	$	(10,124	)	$	5,853
Developed technology		42,558		(39,270	)		3,288
Customer relationships		31,783		(23,404	)		8,379
	$	90,318	$	(72,798	)	$	17,520

	December 31, 2018
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Trade name	$	15,977	$	(8,528	)	$	7,449
Developed technology		42,558		(34,472	)		8,086
Customer relationships		31,783		(19,533	)		12,250
	$	90,318	$	(62,533	)	$	27,785

Amortization Expense by Operation Expense Categories

Amortization expense is included in the following functional statements of operations expense categories. Amortization expense was as follows (in thousands):

	Year Ended December 31,
	2019		2018		2017
Cost of revenues	$	4,797	$	6,863	$	6,847
Sales and marketing		3,872		3,887		3,872
General and administrative		1,596		2,273		2,591
	$	10,265	$	13,023	$	13,310

Summary of Estimated Amortization Expense

2020	$	6,172
2021		5,011
2022		2,686
2023		2,154
2024		855
Thereafter		642
	$	17,520

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

Components of Income (Loss) Before Income Taxes

The components of income (loss) before income taxes were as follows (in thousands):

	Year Ended December 31,
	2019			2018			2017
United States	$	(33,940	)	$	(30,967	)	$	(31,794	)
International		3,519			3,263			(1,049	)
	$	(30,421	)	$	(27,704	)	$	(32,843	)

Components of Total Provision for Income Taxes

The components of the total provision for income taxes were as follows (in thousands):

	Year Ended December 31,
	2019		2018		2017
Current
Federal	$	—	$	—	$	—
State		59		24		51
Foreign		352		835		429
Total current tax expense		411		859		480
Deferred
Federal		—		—		—
State		—		—		—
Foreign		1,314		213		85
Total deferred tax provision		1,314		213		85
Total provision for income taxes	$	1,725	$	1,072	$	565

Reconciliation of Statutory U.S. Federal Tax Rate to Effective Tax Rate

A reconciliation of the statutory U.S. federal income tax rate to the Company’s effective tax rate for the years ended December 31, 2019, 2018, and 2017 was as follows:

	Year Ended December 31,
	2019			2018			2017
Federal statutory income tax rate		21.0	%		21.0	%		34.0	%
State tax, net of federal benefit		(0.2	%)		(0.1	%)		(0.1	%)
Federal tax credits		5.8	%		6.4	%		3.3	%
Change in valuation allowance		(34.1	%)		(61.2	%)		(13.6	%)
Common stock warrants		—			—			(3.7	%)
Foreign tax differential		(4.8	%)		(5.1	%)		(3.5	%)
Windfall tax benefits, net related to stock-based compensation		11.2	%		40.2	%		15.3	%
Effect of rate and other changes on federal deferred taxes, net due to enactment of Tax Cuts and Jobs Act		—			—			(30.0	%)
Nondeductible officer compensation		(2.8	%)		(1.8	%)		—
Nondeductible meals and entertainment		(1.9	%)		(1.7	%)		—
Other		0.1	%		(1.6	%)		(3.4	%)
		(5.7	%)		(3.9	%)		(1.7	%)

Significant Components of Deferred Tax Assets and Liabilities

Significant components of the Company’s deferred tax assets and liabilities were as follows (in thousands):

	December 31,
	2019			2018
Deferred tax assets
Net operating loss carryforwards	$	49,310		$	44,422
Business credits		12,479			8,279
Stock-based compensation		7,155			5,839
Operating leases		3,263			—
Accrued expenses and other current liabilities		2,974			2,394
Other		358			1,192
Total deferred tax assets		75,539			62,126
Less: valuation allowance		(30,598	)		(45,173	)
Deferred tax assets, net of valuation allowance		44,941			16,953
Deferred tax liabilities
Convertible notes		(25,510	)		—
Intangible assets		(6,040	)		(8,735	)
Prepaid expenses		(15,163	)		(10,676	)
Property and equipment		(186	)		(801	)
Right-of-Use asset		(2,559	)		—
Other		(54	)		2
Total deferred tax liabilities		(49,512	)		(20,210	)
Net deferred taxes	$	(4,571	)	$	(3,257	)

Summary of Changes in Valuation Allowance

The changes in the valuation allowance were as follows (in thousands).

	Year Ended December 31,
	2019			2018		2017
Valuation allowance, at beginning of year	$	45,173		$	23,904	$	2,674
Increase in valuation allowance recorded through earnings		12,808			21,269		7,332
Decrease in valuation allowance recorded through equity		(27,383	)		—		—
Increase in valuation allowance as result of adoption of ASU 2016-09		—			—		13,898
Valuation allowance, at end of year	$	30,598		$	45,173	$	23,904

Rollforward of Total Gross Unrecognized Tax Benefits

The following is a rollforward of the Company’s total gross unrecognized tax benefits (in thousands):

	Year Ended December 31,
	2019		2018		2017
Beginning gross unrecognized tax benefits	$	1,223	$	672	$	382
Increases related to prior year tax positions		134		130		38
Increases related to current year tax positions		380		421		252
Ending gross unrecognized tax benefits	$	1,737	$	1,223	$	672

Net Loss per Share (Tables)

12 Months Ended

Dec. 31, 2019

Earnings Per Share [Abstract]

Schedule of Basic and Diluted Loss per Share

The following table sets forth the computation of basic and diluted net loss per share (in thousands, except per share amounts):

	Year Ended December 31,
	2019			2018			2017
Numerator:
Net loss attributable to BlackLine, Inc.	$	(32,535	)	$	(28,714	)	$	(33,408	)
Denominator:
Weighted average shares		55,320			53,912			52,161
Add: Dilutive effect of securities		—			—			—
Shares used to calculate diluted net loss per share		55,320			53,912			52,161
Basic net loss per share attributable to BlackLine, Inc.	$	(0.59	)	$	(0.53	)	$	(0.64	)
Diluted net loss per share attributable to BlackLine, Inc.	$	(0.59	)	$	(0.53	)	$	(0.64	)

Schedule of Potentially Dilutive Shares Excluded From Calculation of Diluted Net Loss Per Share Attributable to Common Stockholders

The following potentially dilutive shares were excluded from the calculation of diluted net loss per share attributable to common stockholders because they were anti-dilutive:

	Year Ended December 31,
	2019		2018		2017
Stock options with service-only vesting conditions		3,486		3,820		5,019
Stock options with performance conditions		683		683		683
Restricted stock units		1,654		1,300		2
Total shares excluded from net loss per share		5,823		5,803		5,704

Equity Awards (Tables)

12 Months Ended

Dec. 31, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Stock Option Activity

A summary of the Company’s stock option activity and related information for awards that contain service-only vesting conditions was as follows:

	Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term		Aggregate Intrinsic Value
	(in thousands)					(in years)		(in thousands)
Outstanding at December 31, 2018		3,820		$	21.85		7.5	$	75,287
Granted		480		$	49.24
Exercised		(710	)	$	15.44
Forfeited/canceled		(104	)	$	22.09
Outstanding at December 31, 2019		3,486		$	26.92		7.0	$	85,983
Exercisable at December 31, 2019		2,019		$	18.43

Summary of Restricted Stock Units Activity

The following table summarizes activity for restricted stock units:

				Weighted-Average
	Restricted			Grant Date
	Stock Units			Fair Value
	(in thousands)
Nonvested at December 31, 2018		1,300		$	42.29
Granted		961		$	49.55
Vested		(474	)	$	42.80
Forfeited/canceled		(133	)	$	46.08
Nonvested at December 31, 2019		1,654		$	46.05

Schedule of Weighted Average Assumptions

The following information represents the weighted average of the assumptions used in the Black-Scholes option-pricing model for stock options granted:

	Year Ended December 31,
	2019		2018		2017
Expected term (years)		6.1		6.1		6.2
Expected volatility	46.7%		46.0%		47.0%
Risk free interest rate	2.2%		2.8%		2.1%
Expected dividend yield		—		—		—

The fair value of ESPP shares granted was estimated using the Black-Scholes option pricing model with the following weighted-average assumptions:

	Year Ended December 31,
	2019	2018
Risk-free interest rate	1.6 - 2.4 %	2.6%
Expected term (in years)	0.5 - 1		0.7
Volatility	39.3 - 54.3 %	42.9%

Summary of Stock-Based Compensation Expense

Stock-based compensation expense recorded in the Company’s consolidated statements of operations was as follows (in thousands):

	Year Ended December 31,
	2019		2018		2017
Cost of revenues	$	4,814	$	3,265	$	1,149
Sales and marketing		15,389		8,674		10,811
Research and development		4,729		2,570		767
General and administrative		9,120		6,386		3,317
	$	34,052	$	20,895	$	16,044

Geographic Information (Tables)

12 Months Ended

Dec. 31, 2019

Segment Reporting [Abstract]

Schedule of Long-lived Assets Consist of Property and Equipment, Net and Operating Lease Right-of-use Assets by Geographic Region

The following table sets forth the Company’s long-lived assets, which consist of property and equipment, net, and operating lease right-of-use assets by geographic region (in thousands):

	Year Ended December 31,
	2019		2018
United States	$	20,848	$	12,407
International		4,725		1,129
	$	25,573	$	13,536

Unaudited Quarterly Data (Tables)

12 Months Ended

Dec. 31, 2019

Quarterly Financial Information Disclosure [Abstract]

Summary of Unaudited Quarterly Consolidated Statements of Operations

	Quarter Ended
	2019												2018
	December 31,			September 30,			June 30,			March 31,			December 31,			September 30,			June 30,			March 31,
Revenues	$	80,258		$	74,925		$	69,664		$	64,129		$	62,316		$	58,734		$	55,454		$	51,284
Gross profit	$	65,137		$	59,633		$	54,720		$	50,511		$	48,431		$	45,217		$	43,588		$	39,678
Net loss	$	(8,712	)	$	(8,876	)	$	(5,527	)	$	(9,031	)	$	(8,205	)	$	(4,766	)	$	(8,553	)	$	(7,252	)
Net loss attributable to non-controlling interest	$	(466	)	$	(509	)	$	(219	)	$	(250	)	$	(62	)	$	—		$	—		$	—
Adjustment attributable to non-controlling interest	$	940		$	839		$	54		$	—		$	—		$	—		$	—		$	—
Net loss attributable to BlackLine, Inc.	$	(9,186	)	$	(9,206	)	$	(5,362	)	$	(8,781	)	$	(8,143	)	$	(4,766	)	$	(8,553	)	$	(7,252	)
Basic net loss per share attributable to BlackLine, Inc.	$	(0.16	)	$	(0.17	)	$	(0.10	)	$	(0.16	)	$	(0.15	)	$	(0.09	)	$	(0.16	)	$	(0.14	)
Diluted net loss per share attributable to BlackLine, Inc.	$	(0.16	)	$	(0.17	)	$	(0.10	)	$	(0.16	)	$	(0.15	)	$	(0.09	)	$	(0.16	)	$	(0.14	)

	Quarter Ended March 31, 2018
	As Previously Reported			Adjustments			As Revised
	(in thousands, except per share data)
Net loss	$	(7,155	)	$	(97	)	$	(7,252	)
Net loss attributable to BlackLine, Inc.	$	(7,155	)	$	(97	)	$	(7,252	)
Basic net loss per share attributable to BlackLine, Inc.	$	(0.13	)	$	(0.01	)	$	(0.14	)
Diluted net loss per share attributable to BlackLine, Inc.	$	(0.13	)	$	(0.01	)	$	(0.14	)

	Quarter Ended June 30, 2018
	As Previously Reported			Adjustments			As Revised
	(in thousands, except per share data)
Net loss	$	(8,457	)	$	(96	)	$	(8,553	)
Net loss attributable to BlackLine, Inc.	$	(8,457	)	$	(96	)	$	(8,553	)

	Quarter Ended September 30, 2018
	As Previously Reported			Adjustments			As Revised
	(in thousands, except per share data)
Net loss	$	(4,460	)	$	(306	)	$	(4,766	)
Net loss attributable to BlackLine, Inc.	$	(4,460	)	$	(306	)	$	(4,766	)
Basic net loss per share attributable to BlackLine, Inc.	$	(0.08	)	$	(0.01	)	$	(0.09	)
Diluted net loss per share attributable to BlackLine, Inc.	$	(0.08	)	$	(0.01	)	$	(0.09	)

	Quarter Ended December 31, 2018
	As Previously Reported			Adjustments			As Revised
	(in thousands, except per share data)
Net loss	$	(7,794	)	$	(411	)	$	(8,205	)
Net loss attributable to BlackLine, Inc.	$	(7,732	)	$	(411	)	$	(8,143	)
Basic net loss per share attributable to BlackLine, Inc.	$	(0.14	)	$	(0.01	)	$	(0.15	)
Diluted net loss per share attributable to BlackLine, Inc.	$	(0.14	)	$	(0.01	)	$	(0.15	)

	Quarter Ended March 31, 2019
	As Previously Reported			Adjustments			As Revised
	(in thousands, except per share data)
Net loss	$	(8,833	)	$	(198	)	$	(9,031	)
Net loss attributable to BlackLine, Inc.	$	(8,583	)	$	(198	)	$	(8,781	)

	Quarter Ended June 30, 2019
	As Previously Reported			Adjustments			As Revised
	(in thousands, except per share data)
Net loss	$	(5,390	)	$	(137	)	$	(5,527	)
Net loss attributable to BlackLine, Inc.	$	(5,225	)	$	(137	)	$	(5,362	)
Basic net loss per share attributable to BlackLine, Inc.	$	(0.09	)	$	(0.01	)	$	(0.10	)
Diluted net loss per share attributable to BlackLine, Inc.	$	(0.09	)	$	(0.01	)	$	(0.10	)

	Quarter Ended September 30, 2019
	As Previously Reported			Adjustments		As Revised
	(in thousands, except per share data)
Net loss	$	(8,912	)	$	36	$	(8,876	)
Net loss attributable to BlackLine, Inc.	$	(9,242	)	$	36	$	(9,206	)

Significant Accounting Policies - Additional Information (Details)		12 Months Ended
	Jan. 01, 2017 USD ($)	Dec. 31, 2019 USD ($) Segment Customer Repoting_unit	Dec. 31, 2018 USD ($) Customer Repoting_unit	Dec. 31, 2017 USD ($) Customer	Jan. 01, 2019 USD ($)
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Adjustment to accumulated deficit	$ 1,000,000.0
Operating lease right-of-use (“ROU”) assets		$ 12,549,000			$ 14,900,000
Operating lease liabilities		$ 15,544,000			$ 18,300,000
Description of operating lease, option to extend		some of which include options to extend the leases for up to ten years
Description of operating lease, option to terminate		some of which include options to terminate the leases within one year
Number of operating segments \| Segment		1
Restricted cash included in other assets		$ 250,000	$ 274,000
Restricted Cash and Cash Equivalents, Noncurrent, Asset, Statement of Financial Position [Extensible List]			us-gaap:OtherAssetsNoncurrent
Capitalized computer software, amortization		4,700,000	$ 3,900,000	$ 2,700,000
Capitalized computer software, accumulated amortization		$ 14,300,000	9,500,000
Amortization of Internal-use software implementation costs to subscription and support costs			$ 0	0
Number of Reporting Units \| Repoting_unit		1	1
Asset impairment charges		$ 0	$ 0	0
Subscription fees payable, description		Customers pay subscription and support fees for access to the Company’s SaaS platform generally for a one-year period. In more limited cases, customers may pay for up to three years in advance. Fees are based on a number of factors, including the solutions subscribed for by the customer and the number of users having access to the solutions.
SaaS platform subscription fee, period		1 year
SaaS platform subscription fee, maximum advance period		3 years
Deferred revenue recognized		$ 129,300,000	104,200,000	78,200,000
Contracted not recognized revenue		$ 366,900,000
Contracted not recognized revenue, expects to recognize revenue over next 12 months		60.00%
Contract capitalized cost, amortized method		straight-line basis
Impairment losses in relation to costs capitalized		$ 0
Advertising cost expense		$ 10,900,000	8,000,000.0	7,700,000
Stock-based compensation award vesting period		4 years
Estimated dividend yield		0.00%
Foreign currency transaction gains (losses)		$ (500,000)	(100,000)	0.6
Sales and Marketing Expenses
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Amortization expense		$ 18,100,000	$ 23,600,000	$ 15,600,000
Computer Software Development Costs
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Estimated useful life		3 years
Furniture and Fixtures
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Property and equipment, useful life		5 years
Leasehold Improvements
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives		lease term or seven years
Revenues
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Number of single customers comprising 10% or more \| Customer		0	0	0
Accounts Receivable
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Number of single customers comprising 10% or more \| Customer		0	0
Minimum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Operating lease, remaining lease term		1 year
Estimated useful life		1 year
Minimum \| Machinery and Equipment
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Property and equipment, useful life		3 years
Minimum \| Purchased Software
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Property and equipment, useful life		3 years
Maximum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Operating lease, remaining lease term		6 years
Operating lease, extended lease term		10 years
Operating lease, termination period		1 year
Estimated useful life		10 years
Maximum \| Machinery and Equipment
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Property and equipment, useful life		5 years
Maximum \| Purchased Software
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Property and equipment, useful life		5 years

Significant Accounting Policies - Schedule of Reclassifications and Revisions for the Financial Statement - Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other assets	$ 52,883	$ 36,478
Total assets	1,014,552	493,481
Accrued expenses and other current liabilities	30,098	24,479
Total current liabilities	206,997	159,003
Deferred tax liabilities, net	4,571	3,257
Total liabilities	611,034	169,827
Accumulated deficit	(163,598)	(132,896)
Total stockholders' equity	398,613	319,267	$ 315,913	$ 308,042
Total liabilities and stockholders' equity	$ 1,014,552	493,481
As Previously Reported
Other assets		36,865
Total assets		493,868
Accrued expenses and other current liabilities		24,705
Total current liabilities		159,229
Deferred tax liabilities, net		1,116
Total liabilities		167,912
Accumulated deficit		(130,594)
Total stockholders' equity		321,569	317,305	309,077
Total liabilities and stockholders' equity		493,868
Adjustments
Other assets		(387)
Total assets		(387)
Accrued expenses and other current liabilities		(226)
Total current liabilities		(226)
Deferred tax liabilities, net		2,141
Total liabilities		1,915
Accumulated deficit		(2,302)
Total stockholders' equity		(2,302)	$ (1,392)	$ (1,035)
Total liabilities and stockholders' equity		$ (387)

Significant Accounting Policies - Schedule of Reclassifications and Revisions for the Financial Statement - Consolidated Statement of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Provision for (Benefit) from income taxes									$ 1,725	$ 1,072	$ 565
Net loss	$ (8,712)	$ (8,876)	$ (5,527)	$ (9,031)	$ (8,205)	$ (4,766)	$ (8,553)	$ (7,252)	(32,146)	(28,776)	(33,408)
Net loss attributable to BlackLine, Inc.	$ (9,186)	$ (9,206)	$ (5,362)	$ (8,781)	$ (8,143)	$ (4,766)	$ (8,553)	$ (7,252)	$ (32,535)	$ (28,714)	$ (33,408)
Basic net loss per share attributable to BlackLine, Inc.	$ (0.16)	$ (0.17)	$ (0.10)	$ (0.16)	$ (0.15)	$ (0.09)	$ (0.16)	$ (0.14)	$ (0.59)	$ (0.53)	$ (0.64)
Diluted net loss per share attributable to BlackLine, Inc.	$ (0.16)	$ (0.17)	$ (0.10)	$ (0.16)	$ (0.15)	$ (0.09)	$ (0.16)	$ (0.14)	$ (0.59)	$ (0.53)	$ (0.64)
As Previously Reported
Provision for (Benefit) from income taxes										$ 162	$ 208
Net loss		$ (8,912)	$ (5,390)	$ (8,833)	$ (7,794)	$ (4,460)	$ (8,457)	$ (7,155)		(27,866)	(33,051)
Net loss attributable to BlackLine, Inc.		(9,242)	$ (5,225)	(8,583)	$ (7,732)	$ (4,460)	(8,457)	$ (7,155)		$ (27,804)	$ (33,051)
Basic net loss per share attributable to BlackLine, Inc.			$ (0.09)		$ (0.14)	$ (0.08)		$ (0.13)		$ (0.52)	$ (0.63)
Diluted net loss per share attributable to BlackLine, Inc.			$ (0.09)		$ (0.14)	$ (0.08)		$ (0.13)		$ (0.52)	$ (0.63)
Adjustments
Provision for (Benefit) from income taxes										$ 910	$ 357
Net loss		36	$ (137)	(198)	$ (411)	$ (306)	(96)	$ (97)		(910)	(357)
Net loss attributable to BlackLine, Inc.		$ 36	$ (137)	$ (198)	$ (411)	$ (306)	$ (96)	$ (97)		$ (910)	$ (357)
Basic net loss per share attributable to BlackLine, Inc.			$ (0.01)		$ (0.01)	$ (0.01)		$ (0.01)		$ (0.01)	$ (0.01)
Diluted net loss per share attributable to BlackLine, Inc.			$ (0.01)		$ (0.01)	$ (0.01)		$ (0.01)		$ (0.01)	$ (0.01)

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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+ Details

Significant Accounting Policies - Schedule of Reclassifications and Revisions for the Financial Statement - Consolidated Statement of Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net loss	$ (8,712)	$ (8,876)	$ (5,527)	$ (9,031)	$ (8,205)	$ (4,766)	$ (8,553)	$ (7,252)	$ (32,146)	$ (28,776)	$ (33,408)
Comprehensive loss									(31,685)	(28,536)	(33,430)
Comprehensive loss attributable to BlackLine, Inc.									$ (30,370)	(28,606)	(33,430)
As Previously Reported
Net loss		(8,912)	(5,390)	(8,833)	(7,794)	(4,460)	(8,457)	(7,155)		(27,866)	(33,051)
Comprehensive loss										(27,626)	(33,073)
Comprehensive loss attributable to BlackLine, Inc.										(27,696)	(33,073)
Adjustments
Net loss		$ 36	$ (137)	$ (198)	$ (411)	$ (306)	$ (96)	$ (97)		(910)	(357)
Comprehensive loss										(910)	(357)
Comprehensive loss attributable to BlackLine, Inc.										$ (910)	$ (357)

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

+ Details

Significant Accounting Policies - Schedule of Reclassifications and Revisions for the Financial Statement - Consolidated Statements of Stockholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Beginning Balance				$ 319,267				$ 315,913	$ 319,267	$ 315,913	$ 308,042
Adjusted Balance											308,042
Net loss attributable to BlackLine, Inc.	$ (9,186)	$ (9,206)	$ (5,362)	(8,781)	$ (8,143)	$ (4,766)	$ (8,553)	(7,252)	(32,535)	(28,714)	(33,408)
Ending Balance	398,613				319,267				398,613	319,267	315,913
Accumulated Deficit
Beginning Balance				(132,896)				(104,182)	(132,896)	(104,182)	(70,702)
Adjusted Balance											(70,774)
Net loss attributable to BlackLine, Inc.									(30,702)	(28,714)	(33,408)
Ending Balance	$ (163,598)				(132,896)				(163,598)	(132,896)	(104,182)
As Previously Reported
Beginning Balance				321,569				317,305	321,569	317,305	309,077
Adjusted Balance											309,077
Net loss attributable to BlackLine, Inc.		(9,242)	(5,225)	(8,583)	(7,732)	(4,460)	(8,457)	(7,155)		(27,804)	(33,051)
Ending Balance					321,569					321,569	317,305
As Previously Reported \| Accumulated Deficit
Beginning Balance				(130,594)				(102,790)	(130,594)	(102,790)	(69,667)
Adjusted Balance											(69,739)
Net loss attributable to BlackLine, Inc.										(27,804)	(33,051)
Ending Balance					(130,594)					(130,594)	(102,790)
Adjustments
Beginning Balance				(2,302)				(1,392)	(2,302)	(1,392)	(1,035)
Adjusted Balance											(1,035)
Net loss attributable to BlackLine, Inc.		$ 36	$ (137)	(198)	(411)	$ (306)	$ (96)	(97)		(910)	(357)
Ending Balance					(2,302)					(2,302)	(1,392)
Adjustments \| Accumulated Deficit
Beginning Balance				$ (2,302)				$ (1,392)	$ (2,302)	(1,392)	(1,035)
Adjusted Balance											(1,035)
Net loss attributable to BlackLine, Inc.										(910)	(357)
Ending Balance					$ (2,302)					$ (2,302)	$ (1,392)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Significant Accounting Policies - Schedule of Reclassifications and Revisions for the Financial Statement - Consolidated Statement of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net loss attributable to BlackLine, Inc.	$ (9,186)	$ (9,206)	$ (5,362)	$ (8,781)	$ (8,143)	$ (4,766)	$ (8,553)	$ (7,252)	$ (32,535)	$ (28,714)	$ (33,408)
Net loss	$ (8,712)	(8,876)	(5,527)	(9,031)	(8,205)	(4,766)	(8,553)	(7,252)	(32,146)	(28,776)	(33,408)
Deferred income taxes									1,314	213	85
Accrued expenses and other current liabilities									$ 5,789	4,191	2,120
As Previously Reported
Net loss attributable to BlackLine, Inc.		(9,242)	(5,225)	(8,583)	(7,732)	(4,460)	(8,457)	(7,155)		(27,804)	(33,051)
Net loss		(8,912)	(5,390)	(8,833)	(7,794)	(4,460)	(8,457)	(7,155)		(27,866)	(33,051)
Deferred income taxes										(923)	(272)
Accrued expenses and other current liabilities										4,417
Adjustments
Net loss attributable to BlackLine, Inc.		36	(137)	(198)	(411)	(306)	(96)	(97)		(910)	(357)
Net loss		$ 36	$ (137)	$ (198)	$ (411)	$ (306)	$ (96)	$ (97)		(910)	(357)
Deferred income taxes										1,136	$ 357
Accrued expenses and other current liabilities										$ (226)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

+ Details

Significant Accounting Policies - Schedule of Weighted Average Assumptions (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Expected term (years)	6 years 1 month 6 days	6 years 1 month 6 days	6 years 2 months 12 days
Expected volatility	46.70%	46.00%	47.00%
Risk free interest rate	2.20%	2.80%	2.10%
Expected dividend yield	0.00%

Revenues - Schedule of Disaggregation of Revenues by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation Of Revenue [Line Items]
Total revenues	$ 80,258	$ 74,925	$ 69,664	$ 64,129	$ 62,316	$ 58,734	$ 55,454	$ 51,284	$ 288,976	$ 227,788	$ 175,603
United States
Disaggregation Of Revenue [Line Items]
Total revenues									223,375	180,152	141,499
International
Disaggregation Of Revenue [Line Items]
Total revenues									$ 65,601	$ 47,636	$ 34,104

Redeemable Non-Controlling Interest - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Oct. 31, 2018	Dec. 31, 2019
Redeemable Noncontrolling Interest [Line Items]
Redeemable non-controlling interests		$ 1.8
BlackLine K.K.
Redeemable Noncontrolling Interest [Line Items]
Business combination, agreement date	Sep. 30, 2018
Business combination, contribution	$ 4.5
Business combination, outstanding common stock percentage	51.00%

Redeemable Non-Controlling Interest - Summary of Redeemable Non-Controlling Interest (Details) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Equity Method Investments And Joint Ventures [Abstract]
Balance at beginning of period				$ 4,387
Investment by redeemable non-controlling interest					$ 4,317
Net loss attributable to redeemable non-controlling interest (excluding adjustment to non-controlling interest)				(1,444)	(62)
Foreign currency translation				129	132
Adjustment to redeemable non-controlling interest	$ 940	$ 839	$ 54	1,833
Balance at end of period	$ 4,905			$ 4,905	$ 4,387

Balance Sheet Components - Schedule of Investments in Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 487,404	$ 86,485
Gross Unrealized Gains	130
Gross Unrealized Losses	(19)	(89)
Fair Value	487,515	86,396
U.S. treasury securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	382,269	25,856
Gross Unrealized Gains	67
Gross Unrealized Losses	(1)	(29)
Fair Value	382,335	25,827
Corporate bonds
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	77,009	32,030
Gross Unrealized Gains	63
Gross Unrealized Losses	(18)	(60)
Fair Value	77,054	31,970
Commercial paper
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	28,126	28,599
Fair Value	$ 28,126	$ 28,599

Balance Sheet Components - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule Of Available For Sale Securities [Line Items]
Realized gain and losses recognized	$ 0	$ 0	$ 0
Maximum
Schedule Of Available For Sale Securities [Line Items]
Marketable securities contractual maturity period	2 years
General and Administrative Expenses
Schedule Of Available For Sale Securities [Line Items]
Net gains and losses on maturities of marketable securities reclassified from accumulated other comprehensive loss to earnings	$ 2,000,000.0	$ 1,000,000.0	$ 0

Balance Sheet Components - Summary of Amortized Cost and Fair Values of Marketable Securities, by Remaining Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract]
Maturing within 1 year	$ 473,221
Maturing between 1 and 2 years	14,183
Amortized Cost	487,404	$ 86,485
Maturing within 1 year	473,321
Maturing between 1 and 2 years	14,194
Total, Fair Value	$ 487,515

Balance Sheet Components - Summary of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract]
Partner referral fees	$ 833	$ 5,219
Other prepaid expenses and other current assets	11,997	8,823
Prepaid expenses and other current assets, Total	$ 12,830	$ 14,042

Balance Sheet Components - Summary of Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract]
Deferred customer contract acquisition costs	$ 49,709	$ 34,172
Restricted cash	250	274
Capitalized software implementation costs	1,237
Other assets	1,687	2,032
Other Assets Noncurrent	$ 52,883	$ 36,478

Balance Sheet Components - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Payables And Accruals [Abstract]
Accrued salaries and employee benefits	$ 20,775	$ 17,054
Accrued income and other taxes payable	4,198	4,321
Short-term tenant improvement allowance		475
Other accrued expenses and current liabilities	5,125	2,629
Accrued expenses and other current liabilities	$ 30,098	$ 24,479

Leases - Summary of Lease Expense (Details) $ in Thousands	12 Months Ended
Leases - Summary of Lease Expense (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Lease Cost [Abstract]
Operating lease cost	$ 5,957
Short-term lease cost	875
Variable cost	630
Total lease cost	$ 7,462

Leases - Summary of Supplemental Information Related to Leases (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Leases [Abstract]
Cash paid for amounts included in the measurement of lease liabilities - operating leases	$ 6,613
Weighted-average remaining lease term - operating leases (in years)	4 years 2 months 12 days
Weighted-average discount rate - outstanding operating leases	6.00%

Leases - Schedule of Maturities of Lease Liabilities and Future Minimum Lease Payments Under Non-cancelable Operating Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating Lease Liabilities Payments Due [Abstract]
2019	$ 5,674		$ 7,059
2020	4,131		5,307
2021	3,067		3,786
2022	2,906		2,586
2023	473		2,638
Thereafter	1,191		237
Total lease payments	17,442		$ 21,613
Less imputed interest	(1,898)
Total	$ 15,544	$ 18,300

Leases - Additional Information (Details)	Dec. 31, 2019 USD ($)
Leases [Abstract]
Lessee, operating leases, not yet commenced	$ 0

Fair Value Measurements - Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total assets	$ 527,282	$ 118,417
Liabilities
Contingent consideration	6,362	6,316
Total liabilities	6,362	6,316
Money market funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	39,767	32,021
U.S. treasury securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities	382,335	25,827
Corporate bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities	77,054	31,970
Commercial paper
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities	28,126	28,599
Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total assets	422,102	57,848
Level 1 \| Money market funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	39,767	32,021
Level 1 \| U.S. treasury securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities	382,335	25,827
Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total assets	105,180	60,569
Level 2 \| Corporate bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities	77,054	31,970
Level 2 \| Commercial paper
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities	28,126	28,599
Level 3
Liabilities
Contingent consideration	6,362	6,316
Total liabilities	$ 6,362	$ 6,316

Fair Value Measurements - Summary of Changes in Contingent Consideration Liability (Details) - Contingent Consideration - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Beginning fair value	$ 6,316	$ 5,866	$ 5,238
Change in fair value	46	450	628
Ending fair value	$ 6,362	$ 6,316	$ 5,866

Property and Equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 31,560	$ 26,602
Less: accumulated depreciation and amortization	(18,536)	(13,066)
Property and equipment, net	13,024	13,536
Computers and equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	10,547	6,598
Purchased software
Property Plant And Equipment [Line Items]
Property and equipment, gross	7,745	7,356
Furniture and fixtures
Property Plant And Equipment [Line Items]
Property and equipment, gross	2,606	2,571
Leasehold improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	10,134	$ 10,077
Construction in progress
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 528

Property and Equipment - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property Plant And Equipment [Line Items]
Depreciation and amortization expense related to property and equipment	$ 21,274	$ 22,336	$ 19,971
Property and Equipment
Property Plant And Equipment [Line Items]
Depreciation and amortization expense related to property and equipment	$ 6,300	$ 5,400	$ 4,000

Convertible Senior Notes - Additional Information (Details) $ / shares in Units, $ in Thousands		12 Months Ended
	Aug. 13, 2019 USD ($) d $ / shares $ / Note shares	Dec. 31, 2019 USD ($) $ / shares
Debt Instrument [Line Items]
Proceeds form issuance of convertible note		$ 487,163
Initial conversion price \| $ / shares		$ 73.40
Interest expense related to amortization of debt discount and issuance costs		$ 8,410
Capped calls cost		$ 46,200
Cap price per share \| $ / shares		$ 106.76
0.125% Convertible Senior Notes Due 2024
Debt Instrument [Line Items]
Proceeds form issuance of convertible note	$ 500,000
Convertible senior notes interest rate	0.125%
Option to purchase principal amount	$ 65,000
Convertible senior notes maturity date		Aug. 01, 2024
Principal amount per convertible notes \| $ / Note	1,000
Number of common stock share used for conversion \| shares	13.6244
Initial conversion price \| $ / shares	$ 73.40
Debt repurchase amount percentage prior to maturity	100.00%
Debt discount	$ 114,200
Transaction costs related to issuance of notes	12,800
Transaction costs allocated to liability component of notes	9,900
Transaction costs allocated to equity component of notes	$ 2,900
Effective interest rate of liability component of notes, excluding conversion option		6.06%
Interest expense related to amortization of debt discount and issuance costs		$ 8,400
Coupon interest expense		$ 200
Remaining life of notes		55 months
0.125% Convertible Senior Notes Due 2024 \| Level 2
Debt Instrument [Line Items]
Estimated fair value of convertible senior notes		$ 505,000
0.125% Convertible Senior Notes Due 2024 \| Minimum
Debt Instrument [Line Items]
Percentage of principal amount of notes declared as accrued based on certain customary events of default	25.00%
0.125% Convertible Senior Notes Due 2024 \| Condition One
Debt Instrument [Line Items]
Convertible senior notes, trading days \| d	20
Convertible senior notes, consecutive trading days \| d	30
0.125% Convertible Senior Notes Due 2024 \| Condition One \| Minimum
Debt Instrument [Line Items]
Percentage of conversion price for notes on each applicable trading day	130.00%
0.125% Convertible Senior Notes Due 2024 \| Condition Two
Debt Instrument [Line Items]
Convertible senior notes, trading days \| d	5
Convertible senior notes, consecutive trading days \| d	5
Principal amount per convertible notes \| $ / Note	1,000
0.125% Convertible Senior Notes Due 2024 \| Condition Two \| Maximum
Debt Instrument [Line Items]
Percentage of conversion price for notes on each applicable trading day	98.00%

Convertible Senior Notes - Summary of Notes (Details) - 0.125% Convertible Senior Notes Due 2024 $ in Thousands	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Principal	$ 500,000
Unamortized debt discount and issuance costs	(115,657)
Net carrying amount	384,343
Carrying amount of the equity component	$ 111,230

Intangible Assets and Goodwill - Summary of Carrying Value of Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 90,318	$ 90,318
Accumulated Amortization	(72,798)	(62,533)
Net Carrying Amount	17,520	27,785
Trade name
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	15,977	15,977
Accumulated Amortization	(10,124)	(8,528)
Net Carrying Amount	5,853	7,449
Developed technology
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	42,558	42,558
Accumulated Amortization	(39,270)	(34,472)
Net Carrying Amount	3,288	8,086
Customer relationships
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	31,783	31,783
Accumulated Amortization	(23,404)	(19,533)
Net Carrying Amount	$ 8,379	$ 12,250

Intangible Assets and Goodwill - Amortization Expense by Operation Expense Categories (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite Lived Intangible Assets [Line Items]
Amortization expenses	$ 10,265	$ 13,023	$ 13,310
Cost of Revenue
Finite Lived Intangible Assets [Line Items]
Amortization expenses	4,797	6,863	6,847
Sales and Marketing
Finite Lived Intangible Assets [Line Items]
Amortization expenses	3,872	3,887	3,872
General and Administrative
Finite Lived Intangible Assets [Line Items]
Amortization expenses	$ 1,596	$ 2,273	$ 2,591

Intangible Assets and Goodwill - Summary of Estimated Amortization Expense (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
2020	$ 6,172
2021	5,011
2022	2,686
2023	2,154
2024	855
Thereafter	642
Net Carrying Amount	$ 17,520	$ 27,785

Intangible Assets and Goodwill - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Non-compete Agreements
Finite Lived Intangible Assets [Line Items]
Changes in carrying amount of goodwill	$ 0	$ 0	$ 0

Income Taxes - Components of Income (Loss) Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
United States	$ (33,940)	$ (30,967)	$ (31,794)
International	3,519	3,263	(1,049)
Loss before income taxes	$ (30,421)	$ (27,704)	$ (32,843)

Income Taxes - Components of Total Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current
State	$ 59	$ 24	$ 51
Foreign	352	835	429
Total current tax expense	411	859	480
Deferred
Foreign	1,314	213	85
Total deferred tax provision	1,314	213	85
Total provision for income taxes	$ 1,725	$ 1,072	$ 565

Income Taxes - Reconciliation of Statutory U.S. Federal Tax Rate to Effective Tax Rate (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Effective Income Tax Rate Continuing Operations Tax Rate Reconciliation [Abstract]
Federal statutory income tax rate	21.00%	21.00%	34.00%
State tax, net of federal benefit	(0.20%)	(0.10%)	(0.10%)
Federal tax credits	5.80%	6.40%	3.30%
Change in valuation allowance	(34.10%)	(61.20%)	(13.60%)
Common stock warrants			(3.70%)
Foreign tax differential	(4.80%)	(5.10%)	(3.50%)
Windfall tax benefits, net related to stock-based compensation	11.20%	40.20%	15.30%
Effect of rate and other changes on federal deferred taxes, net due to enactment of Tax Cuts and Jobs Act			(30.00%)
Nondeductible officer compensation	(2.80%)	(1.80%)
Nondeductible meals and entertainment	(1.90%)	(1.70%)
Other	0.10%	(1.60%)	(3.40%)
Effective tax rate	(5.70%)	(3.90%)	(1.70%)

Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets
Net operating loss carryforwards	$ 49,310	$ 44,422
Business credits	12,479	8,279
Stock-based compensation	7,155	5,839
Operating leases	3,263
Accrued expenses and other current liabilities	2,974	2,394
Other	358	1,192
Total deferred tax assets	75,539	62,126
Less: valuation allowance	(30,598)	(45,173)	$ (23,904)	$ (2,674)
Deferred tax assets, net of valuation allowance	44,941	16,953
Deferred tax liabilities
Convertible notes	(25,510)
Intangible assets	(6,040)	(8,735)
Prepaid expenses	(15,163)	(10,676)
Property and equipment	(186)	(801)
Right-of-Use asset	(2,559)
Other	(54)	2
Total deferred tax liabilities	(49,512)	(20,210)
Net deferred taxes	$ (4,571)	$ (3,257)

Income taxes - Summary of Changes in Valuation Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Valuation Allowance [Line Items]
Valuation allowance, at beginning of year	$ 45,173	$ 23,904	$ 2,674
Increase in valuation allowance recorded through earnings	12,808	21,269	7,332
Decrease in valuation allowance recorded through equity	(27,383)
Valuation allowance, at end of year	$ 30,598	$ 45,173	23,904
ASU 2016-09
Valuation Allowance [Line Items]
Increase in valuation allowance recorded through earnings			$ 13,898

Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Examination [Line Items]
Operating loss carryforwards, limitations on use	Pursuant to Internal Revenue Code Section 382, use of the Company’s net operating loss carryforwards may be limited if the Company experiences a cumulative change in ownership of more than 50% over a three-year period.
Unrecognized tax provision, interest or penalties expense	$ 0	$ 0	$ 0
Unrecognized tax benefits, income tax penalties and interest accrued	0	$ 0
Enterprise Zone
Income Tax Examination [Line Items]
Tax credits	$ 600,000
Tax credits begin to expiration year	2023
Federal
Income Tax Examination [Line Items]
Net operating loss carryforwards	$ 199,000,000.0
Operating loss carryforwards begin to expiration year	2033
Federal \| Research and Development
Income Tax Examination [Line Items]
Tax credits	$ 4,800,000
Tax credits begin to expiration year	2033
State
Income Tax Examination [Line Items]
Net operating loss carryforwards	$ 99,900,000
Tax return period	4 years
State \| Minimum
Income Tax Examination [Line Items]
Operating loss carryforwards begin to expiration year	2023
State \| Maximum
Income Tax Examination [Line Items]
Operating loss carryforwards begin to expiration year	2033
State \| Research and Development
Income Tax Examination [Line Items]
Tax credits	$ 5,000,000.0
Tax credits begin to expiration year	2023
Foreign
Income Tax Examination [Line Items]
Tax credits	$ 2,200,000
Tax credits begin to expiration year	2023
Tax return period	5 years

Income Taxes - Rollforward of Total Gross Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation Of Unrecognized Tax Benefits Excluding Amounts Pertaining To Examined Tax Returns Roll Forward
Beginning gross unrecognized tax benefits	$ 1,223	$ 672	$ 382
Increases related to prior year tax positions	134	130	38
Increases related to current year tax positions	380	421	252
Ending gross unrecognized tax benefits	$ 1,737	$ 1,223	$ 672

Net Loss per Share - Schedule of Basic and Diluted Loss per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Numerator:
Net loss attributable to BlackLine, Inc.	$ (9,186)	$ (9,206)	$ (5,362)	$ (8,781)	$ (8,143)	$ (4,766)	$ (8,553)	$ (7,252)	$ (32,535)	$ (28,714)	$ (33,408)
Denominator:
Weighted average shares									55,320	53,912	52,161
Shares used to calculate diluted net loss per share									55,320	53,912	52,161
Basic net loss per share attributable to BlackLine, Inc.	$ (0.16)	$ (0.17)	$ (0.10)	$ (0.16)	$ (0.15)	$ (0.09)	$ (0.16)	$ (0.14)	$ (0.59)	$ (0.53)	$ (0.64)
Diluted net loss per share attributable to BlackLine, Inc.	$ (0.16)	$ (0.17)	$ (0.10)	$ (0.16)	$ (0.15)	$ (0.09)	$ (0.16)	$ (0.14)	$ (0.59)	$ (0.53)	$ (0.64)

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Net Loss per Share - Schedule of Potentially Dilutive Shares Excluded From Calculation of Diluted Net Loss Per Share Attributable to Common Stockholders (Details) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from net loss per share	5,823	5,803	5,704
Stock options with service-only vesting conditions
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from net loss per share	3,486	3,820	5,019
Stock options with performance conditions
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from net loss per share	683	683	683
Restricted stock units
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from net loss per share	1,654	1,300	2

Net Loss per Share - Additional Information (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share Basic [Line Items]
Conversion option in notes not considered in calculation of diluted net loss per share	5,823	5,803	5,704
Conversion price	$ 73.40
Convertible Notes
Earnings Per Share Basic [Line Items]
Conversion option in notes not considered in calculation of diluted net loss per share	6,800,000
Convertible Notes \| Certain Corporate Events Occur Prior to Maturity Date Or Company Issues Notice of Redemption
Earnings Per Share Basic [Line Items]
Conversion option in notes not considered in calculation of diluted net loss per share	9,400,000

Contingent Consideration - Additional Information (Details) - BlackLine Systems, Inc. - USD ($) $ in Millions	Sep. 03, 2013	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition Contingent Consideration [Line Items]
Maximum contingent cash consideration to be distributed	$ 8.0
Contingent Consideration
Business Acquisition Contingent Consideration [Line Items]
Fair value of contingent consideration		$ 6.4	$ 6.3

Commitments and Contingencies - Additional Information (Details) $ in Millions	Dec. 31, 2019 USD ($)
Commitments And Contingencies Disclosure [Abstract]
Non-cancelable purchase obligations	$ 16.8

Equity Awards - Additional Information (Details)		1 Months Ended			12 Months Ended
Equity Awards - Additional Information (Details)	Jul. 21, 2017 Employee shares	May 31, 2017 shares	Nov. 30, 2016 shares	Oct. 31, 2016 USD ($) ExecutiveOfficer $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares	Dec. 31, 2017 USD ($) $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation award vesting period					4 years
Cash received from exercise of stock options					$ 10,571,000	$ 14,004,000	$ 10,252,000
Stock options granted to purchase shares of common stock for employee \| shares	219,000				480,000
Exercise price of options, granted \| $ / shares					$ 49.55
Stock-based compensation, cost					$ 34,052,000	20,895,000	16,044,000
Stock-based compensation capitalized as an asset					500,000	400,000	100,000
Net operating losses related to foreign tax benefits for equity awards					$ 100,000	200,000	0
Stock-based compensation							$ 6,600,000
Employee Stock Purchase Plan ("ESPP")
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common shares reserved for future issuance \| shares					1,300,000
Weighted-average period to recognize unrecognized compensation expense					1 year
Stock-based compensation, cost					$ 2,100,000	$ 200,000
Total unrecognized compensation cost					$ 2,300,000
Employee stock purchase plan, description					Under the Company’s 2018 Employee Stock Purchase Plan (“ESPP”) eligible employees are granted the right to purchase shares at the lower of 85% of the fair value of the stock at the time of grant or 85% of the fair value at the time of exercise. The right to purchase shares is granted twice yearly for six month offering periods in May and November and exercisable on or about the succeeding November and May, respectively, of each year.
Right to purchase shares at fair value of stock at the time of grant, percentage					85.00%
Right to purchase shares at fair value at the time of exercise, percentage					85.00%
Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Warrants to purchase of common stock \| shares		499,999
Issuance of common stock \| shares		428,033					428,000
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant date fair value per share, granted \| $ / shares					$ 23.40	$ 20.15	$ 15.20
Aggregate intrinsic value, exercised					$ 25,600,000	$ 66,700,000	$ 31,400,000
Cash received from exercise of stock options					10,600,000	$ 14,000,000.0	$ 10,400,000
Unrecognized compensation expense					$ 22,200,000
Weighted-average period to recognize unrecognized compensation expense					2 years 6 months
Number of executive officers, options granted \| ExecutiveOfficer				2
Number of employees impacted by modification \| Employee	8
Stock Options \| Executive Officer
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted to purchase shares of common stock for employee \| shares				682,800
Exercise price of options, granted \| $ / shares				$ 14.00
Options vesting terms					The performance conditions include meeting yearly cash flow targets and cumulative annual recurring revenue targets through 2019.
Stock-based compensation, cost					$ 0
Total fair value of awards grant				$ 24,000,000.0
Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average period to recognize unrecognized compensation expense					2 years 10 months 24 days
Intrinsic value					$ 85,300,000
Total unrecognized compensation cost					$ 65,000,000.0
2016 Equity Incentive Plan \| Stock Options and Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Maximum number of shares Issuable \| shares			6,200,000
Stock-based compensation award vesting period			4 years
Stock option, contractual terms			10 years
Common shares reserved for future issuance \| shares					10,800,000

Equity Awards - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Jul. 21, 2017	Dec. 31, 2019	Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Shares, Outstanding at Beginning balance		3,820,000
Shares, Granted	219,000	480,000
Shares, Exercised		(710,000)
Shares, Forfeited/canceled		(104,000)
Shares, Outstanding at Ending balance		3,486,000	3,820,000
Shares, Exercisable at December 31, 2019		2,019,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted Average Exercise Price, Outstanding at Beginning balance		$ 21.85
Weighted Average Exercise Price, Granted		49.24
Weighted Average Exercise Price, Exercised		15.44
Weighted Average Exercise Price, Forfeited/canceled		22.09
Weighted Average Exercise Price, Outstanding at Ending balance		26.92	$ 21.85
Weighted Average Exercise Price, Exercisable at December 31, 2019		$ 18.43
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]
Weighted Average Remaining Contractual Term (Years)		7 years	7 years 6 months
Weighted Average Remaining Contractual Term, Exercisable at December 31, 2019		0 years
Aggregate Intrinsic Value, Outstanding at Beginning balance		$ 75,287
Aggregate Intrinsic Value, Outstanding at Ending balance		$ 85,983	$ 75,287

Equity Awards - Summary of Restricted Stock Units Activity (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Restricted stock units, Nonvested, Beginning balance \| shares	1,300
Restricted stock units, Granted \| shares	961
Restricted stock units, Vested \| shares	(474)
Restricted stock units, Forfeited/canceled \| shares	(133)
Restricted stock units, Nonvested, Ending balance \| shares	1,654
Weighted Average Grant Date Fair Value, Nonvested at Beginning balance \| $ / shares	$ 42.29
Exercise price of options, granted \| $ / shares	49.55
Weighted Average Grant Date Fair Value, Vested \| $ / shares	42.80
Weighted Average Grant Date Fair Value, Forfeited/canceled \| $ / shares	46.08
Weighted Average Grant Date Fair Value, Nonvested at Ending balance \| $ / shares	$ 46.05

Equity Awards - Schedule of Weighted Average Assumptions (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk-free interest rate	2.20%	2.80%	2.10%
Expected term (in years)	6 years 1 month 6 days	6 years 1 month 6 days	6 years 2 months 12 days
Volatility	46.70%	46.00%	47.00%
Employee Stock Purchase Plan ("ESPP")
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk-free interest rate		2.60%
Expected term (in years)		8 months 12 days
Volatility		42.90%
Employee Stock Purchase Plan ("ESPP") \| Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk-free interest rate	1.60%
Expected term (in years)	6 months
Volatility	39.30%
Employee Stock Purchase Plan ("ESPP") \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk-free interest rate	2.40%
Expected term (in years)	1 year
Volatility	54.30%

Equity Awards - Summary of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 34,052	$ 20,895	$ 16,044
Cost of Revenues
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	4,814	3,265	1,149
Sales and Marketing
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	15,389	8,674	10,811
Research and Development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	4,729	2,570	767
General and Administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 9,120	$ 6,386	$ 3,317

Defined Contribution Plan - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Compensation And Retirement Disclosure [Abstract]
Defined contribution plan, description	The Company makes matching contributions of 100% of each $1 of the employee’s contribution up to the first 3% of the employee’s bi-weekly compensation and 50% of each $1 of the employee’s contribution up to the next 2% of the employee’s bi-weekly compensation.
Percentage of employer matching contribution	100.00%
Employer matching contribution, percent of employees' gross pay	3.00%
Percentage of employer matching contribution, second tier	50.00%
Employer matching contribution, percent of employees' gross pay, second tier	2.00%
Matching contributions to plan	$ 3.6	$ 2.9	$ 2.2

Geographic Information - Schedule of Long-lived Assets Consist of Property and Equipment, Net and Operating Lease Right-of-use Assets by Geographic Region (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Revenues From External Customers And Long Lived Assets [Line Items]
Property and equipment, net and operating lease right-of-use assets	$ 25,573	$ 13,536
United States
Revenues From External Customers And Long Lived Assets [Line Items]
Property and equipment, net and operating lease right-of-use assets	20,848	12,407
International
Revenues From External Customers And Long Lived Assets [Line Items]
Property and equipment, net and operating lease right-of-use assets	$ 4,725	$ 1,129

Subsequent Events - Additional Information (Details) - Restricted stock units - Compensation Committee - shares		12 Months Ended
	Feb. 19, 2020	Dec. 31, 2019
Subsequent Event [Line Items]
Approved award grants to employees	100,000
Number of common stock entitled to receive upon vesting of award	1
Vesting percentage	25.00%
Vesting term		The vast majority of the restricted stock units will vest as to one-fourth of the total number of units awarded on the first anniversary of February 20, 2020 and quarterly thereafter for 12 consecutive quarters.

Unaudited Quarterly Data - Summary of Unaudited Quarterly Consolidated Statements of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Line Items]
Revenues	$ 80,258	$ 74,925	$ 69,664	$ 64,129	$ 62,316	$ 58,734	$ 55,454	$ 51,284	$ 288,976	$ 227,788	$ 175,603
Gross profit	65,137	59,633	54,720	50,511	48,431	45,217	43,588	39,678	230,001	176,914	134,218
Net loss	(8,712)	(8,876)	(5,527)	(9,031)	(8,205)	(4,766)	(8,553)	(7,252)	(32,146)	(28,776)	(33,408)
Net loss attributable to non-controlling interest	(466)	(509)	(219)	(250)	(62)				(1,444)	(62)
Adjustment attributable to non-controlling interest (note 4)	940	839	54						1,833
Net loss attributable to BlackLine, Inc.	$ (9,186)	$ (9,206)	$ (5,362)	$ (8,781)	$ (8,143)	$ (4,766)	$ (8,553)	$ (7,252)	$ (32,535)	$ (28,714)	$ (33,408)
Basic net loss per share attributable to BlackLine, Inc.	$ (0.16)	$ (0.17)	$ (0.10)	$ (0.16)	$ (0.15)	$ (0.09)	$ (0.16)	$ (0.14)	$ (0.59)	$ (0.53)	$ (0.64)
Diluted net loss per share attributable to BlackLine, Inc.	$ (0.16)	$ (0.17)	$ (0.10)	$ (0.16)	$ (0.15)	$ (0.09)	$ (0.16)	$ (0.14)	$ (0.59)	$ (0.53)	$ (0.64)
As Previously Reported
Quarterly Financial Information Disclosure [Line Items]
Net loss		$ (8,912)	$ (5,390)	$ (8,833)	$ (7,794)	$ (4,460)	$ (8,457)	$ (7,155)		$ (27,866)	$ (33,051)
Net loss attributable to BlackLine, Inc.		(9,242)	$ (5,225)	(8,583)	$ (7,732)	$ (4,460)	(8,457)	$ (7,155)		$ (27,804)	$ (33,051)
Basic net loss per share attributable to BlackLine, Inc.			$ (0.09)		$ (0.14)	$ (0.08)		$ (0.13)		$ (0.52)	$ (0.63)
Diluted net loss per share attributable to BlackLine, Inc.			$ (0.09)		$ (0.14)	$ (0.08)		$ (0.13)		$ (0.52)	$ (0.63)
Adjustments
Quarterly Financial Information Disclosure [Line Items]
Net loss		36	$ (137)	(198)	$ (411)	$ (306)	(96)	$ (97)		$ (910)	$ (357)
Net loss attributable to BlackLine, Inc.		$ 36	$ (137)	$ (198)	$ (411)	$ (306)	$ (96)	$ (97)		$ (910)	$ (357)
Basic net loss per share attributable to BlackLine, Inc.			$ (0.01)		$ (0.01)	$ (0.01)		$ (0.01)		$ (0.01)	$ (0.01)
Diluted net loss per share attributable to BlackLine, Inc.			$ (0.01)		$ (0.01)	$ (0.01)		$ (0.01)		$ (0.01)	$ (0.01)