0001564590-19-041296 | 10-Q | XBRL Viewer

Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2019	Oct. 31, 2019
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Trading Symbol	BL
Entity Registrant Name	BLACKLINE, INC.
Entity Central Index Key	0001666134
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		55,639,281
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
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 Quarterly Report	true
Document Transition Report	false
Title of 12(b) Security	Common stock, par value $0.01 per share
Security Exchange Name	NASDAQ

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 528,197	$ 46,181
Marketable securities	68,324	86,396
Accounts receivable, net	81,865	74,902
Prepaid expenses and other current assets	10,874	14,042
Total current assets	689,260	221,521
Capitalized software development costs, net	9,424	9,023
Property and equipment, net	12,891	13,536
Intangible assets, net	19,063	27,785
Goodwill	185,138	185,138
Other assets	46,482	36,865
Total assets	975,639	493,868
Operating lease right-of-use assets	13,381
Current liabilities:
Accounts payable	1,614	3,442
Accrued expenses and other current liabilities	25,704	24,705
Deferred revenue	144,100	129,074
Short-term portion of operating lease liabilities	4,779
Short-term portion of contingent consideration	2,008	2,008
Total current liabilities	178,205	159,229
Operating lease liabilities, noncurrent	11,710
Convertible senior notes, net	378,856
Contingent consideration	4,621	4,308
Deferred tax liabilities, net	1,151	1,116
Deferred revenue, noncurrent	222	277
Other long-term liabilities		2,982
Total liabilities	574,765	167,912
Commitments and contingencies (Note 8)
Redeemable non-controlling interest (Note 4)	4,453	4,387
Stockholders' equity:
Common stock	556	547
Additional paid-in capital	548,201	451,571
Accumulated other comprehensive income	415	45
Accumulated deficit	(152,751)	(130,594)
Total stockholders' equity	396,421	321,569
Total liabilities, redeemable non-controlling interest, and stockholders' equity	$ 975,639	$ 493,868

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues
Total revenues	$ 74,925,000	$ 58,734,000	$ 208,718,000	$ 165,472,000
Cost of revenues
Total cost of revenues	15,292,000	13,517,000	43,854,000	36,989,000
Gross profit	59,633,000	45,217,000	164,864,000	128,483,000
Operating expenses
Sales and marketing	41,848,000	31,709,000	114,888,000	93,086,000
Research and development	11,558,000	7,261,000	32,694,000	22,001,000
General and administrative	14,088,000	11,268,000	40,444,000	34,808,000
Total operating expenses	67,494,000	50,238,000	188,026,000	149,895,000
Loss from operations	(7,861,000)	(5,021,000)	(23,162,000)	(21,412,000)
Other income (expense)
Interest income	2,161,000	578,000	3,590,000	1,474,000
Interest expense	(3,006,000)		(3,006,000)	(4,000)
Other income (expense), net	(845,000)	578,000	584,000	1,470,000
Loss before income taxes	(8,706,000)	(4,443,000)	(22,578,000)	(19,942,000)
Provision for income taxes	206,000	17,000	557,000	130,000
Net loss	(8,912,000)	(4,460,000)	(23,135,000)	(20,072,000)
Net loss and adjustment attributable to non-controlling interest (Note 4)	330,000		(85,000)
Net loss attributable to BlackLine, Inc.	$ (9,242,000)	$ (4,460,000)	$ (23,050,000)	$ (20,072,000)
Basic net loss per share attributable to BlackLine, Inc.	$ (0.17)	$ (0.08)	$ (0.42)	$ (0.37)
Shares used to calculate basic net loss per share	55,480	54,263	55,164	53,660
Diluted net loss per share attributable to BlackLine, Inc.	$ (0.17)	$ (0.08)	$ (0.42)	$ (0.37)
Shares used to calculate diluted net loss per share	55,480	54,263	55,164	53,660
Subscription and Support
Revenues
Total revenues	$ 70,311,000	$ 56,170,000	$ 197,651,000	$ 157,842,000
Cost of revenues
Total cost of revenues	11,689,000	11,174,000	34,109,000	30,048,000
Professional Services
Revenues
Total revenues	4,614,000	2,564,000	11,067,000	7,630,000
Cost of revenues
Total cost of revenues	$ 3,603,000	$ 2,343,000	$ 9,745,000	$ 6,941,000

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (8,912)	$ (4,460)	$ (23,135)	$ (20,072)
Other comprehensive income (loss):
Net change in unrealized gains (losses) on marketable securities, net of tax of $0 for the quarters and nine months ended September 30, 2019 and 2018	(23)	25	213	(29)
Foreign currency translation	10		308
Other comprehensive income (loss)	(13)	25	521	(29)
Comprehensive loss	(8,925)	(4,435)	(22,614)	(20,101)
Less: Other comprehensive loss attributable to redeemable non-controlling interest (excluding adjustment to redeemable non-controlling interest)	(504)		(827)
Comprehensive loss attributable to BlackLine, Inc.	$ (8,421)	$ (4,435)	$ (21,787)	$ (20,101)

- Definition

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

+ References

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+ Details

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (UNAUDITED) (PARENTHETICAL) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net change in unrealized gain on marketable securities, tax	$ 0	$ 0	$ 0	$ 0

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning Balance at Dec. 31, 2017	$ 317,305	$ 530	$ 419,628	$ (63)	$ (102,790)
Beginning Balance, shares at Dec. 31, 2017		52,983
Stock option exercises	13,520	$ 17	13,503
Stock option exercises, shares		1,658
Vesting of restricted stock units, shares		2
Acquisition of common stock for tax withholding obligations	(3,325)		(3,325)
Stock-based compensation	15,034		15,034
Other comprehensive income (loss)	(29)			(29)
Net loss attributable to BlackLine, Inc., including adjustment to redeemable non-controlling interest	(20,072)				(20,072)
Ending Balance at Sep. 30, 2018	322,433	$ 547	444,840	(92)	(122,862)
Ending Balance, shares at Sep. 30, 2018		54,643
Beginning Balance at Jun. 30, 2018	314,088	$ 539	432,068	(117)	(118,402)
Beginning Balance, shares at Jun. 30, 2018		53,837
Stock option exercises	7,416	$ 8	7,408
Stock option exercises, shares		806
Acquisition of common stock for tax withholding obligations	(112)		(112)
Stock-based compensation	5,476		5,476
Other comprehensive income (loss)	25			25
Net loss attributable to BlackLine, Inc., including adjustment to redeemable non-controlling interest	(4,460)				(4,460)
Ending Balance at Sep. 30, 2018	322,433	$ 547	444,840	(92)	(122,862)
Ending Balance, shares at Sep. 30, 2018		54,643
Beginning Balance at Dec. 31, 2018	321,569	$ 547	451,571	45	(130,594)
Beginning Balance, shares at Dec. 31, 2018		54,683
Stock option exercises	8,367	$ 4	8,363
Stock option exercises, shares		535
Vesting of restricted stock units	4	$ 4
Vesting of restricted stock units, shares		339
Issuance of common stock through employee stock purchase plan	2,552	$ 1	2,551
Issuance of common stock through employee stock purchase plan, shares		74
Acquisition of common stock for tax withholding obligations	(3,372)		(3,372)
Stock-based compensation	24,901		24,901
Other comprehensive income (loss)	370			370
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., including adjustment to redeemable non-controlling interest	(23,050)		(893)		(22,157)
Ending Balance at Sep. 30, 2019	396,421	$ 556	548,201	415	(152,751)
Ending Balance, shares at Sep. 30, 2019		55,631
Beginning Balance at Jun. 30, 2019	327,185	$ 553	470,681	299	(144,348)
Beginning Balance, shares at Jun. 30, 2019		55,307
Stock option exercises	3,805	$ 2	3,803
Stock option exercises, shares		247
Vesting of restricted stock units	1	$ 1
Vesting of restricted stock units, shares		77
Acquisition of common stock for tax withholding obligations	(784)		(784)
Stock-based compensation	10,260		10,260
Other comprehensive income (loss)	116			116
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., including adjustment to redeemable non-controlling interest	(9,242)		(839)		(8,403)
Ending Balance at Sep. 30, 2019	$ 396,421	$ 556	$ 548,201	$ 415	$ (152,751)
Ending Balance, shares at Sep. 30, 2019		55,631

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities
Net loss attributable to BlackLine, Inc.	$ (23,050)	$ (20,072)
Net loss and adjustment attributable to redeemable non-controlling interest (Note 4)	(85)
Net loss	(23,135)	(20,072)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	16,803	16,767
Change in fair value of contingent consideration	313	287
Amortization of debt discount and issuance costs	2,923
Stock-based compensation	24,605	14,707
Noncash lease expense	3,677
Accretion of purchase discounts on marketable securities, net	(873)	(602)
Net foreign currency losses	138	334
Deferred income taxes	35	(443)
Provision for (benefit from) doubtful accounts receivable	157	(19)
Changes in operating assets and liabilities:
Accounts receivable	(7,455)	(1,735)
Prepaid expenses and other current assets	3,129	(2,392)
Other assets	(9,647)	(5,017)
Accounts payable	(1,591)	(4,401)
Accrued expenses and other current liabilities	1,447	(58)
Deferred revenue	14,971	13,925
Operating lease liabilities	(3,997)
Other long-term liabilities		36
Net cash provided by operating activities	21,500	11,317
Cash flows from investing activities
Purchases of marketable securities	(93,259)	(103,624)
Proceeds from maturities of marketable securities	95,138	91,840
Proceeds from sales of marketable securities	17,279	7,118
Capitalized software development costs	(3,751)	(4,640)
Purchases of property and equipment	(3,461)	(4,588)
Net cash provided by (used in) investing activities	11,946	(13,894)
Cash flows from financing activities
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	8,371	13,520
Proceeds from employee stock purchase plan	2,552
Acquisition of common stock for tax withholding obligations	(3,372)	(3,325)
Principal payments on capital lease obligations		(443)
Financed purchases of property and equipment	(314)
Net cash provided by financing activities	448,250	9,752
Effect of foreign currency exchange rate changes on cash, cash equivalents, and restricted cash	308
Net increase in cash, cash equivalents, and restricted cash	482,004	7,175
Cash, cash equivalents, and restricted cash, beginning of period	46,455	31,504
Cash, cash equivalents, and restricted cash, end of period	528,459	38,679
Reconciliation of cash, cash equivalents, and restricted cash to the consolidated balance sheets
Cash and cash equivalents at end of period	528,197	38,401
Restricted cash included within prepaid expenses and other current assets at end of period	19
Restricted cash included within other assets at end of period	243	278
Total cash, cash equivalents, and restricted cash at end of period shown in the consolidated statements of cash flows	528,459	38,679
Non-cash financing and investing activities
Stock-based compensation capitalized for software development	296	327
Capitalized software development costs included in accounts payable and accrued expenses and other current liabilities at end of period	182	328
Purchases of property and equipment included in accounts payable and accrued expenses and other current liabilities at end of period	360	$ 55
Leased assets obtained in exchange for new operating lease liabilities	$ 2,195

Company Overview

9 Months Ended

Sep. 30, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Company Overview

Note 1 – Company Overview

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

Basis of Presentation, Significant Accounting Policies and Recently-Issued Accounting Pronouncements

9 Months Ended

Sep. 30, 2019

Accounting Policies [Abstract]

Basis of Presentation, Significant Accounting Policies and Recently-Issued Accounting Pronouncements

Note 2 – Basis of Presentation, Significant Accounting Policies and Recently-Issued Accounting Pronouncements

The accompanying condensed consolidated financial statements were prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information. Certain information and disclosures normally included in consolidated financial statements prepared in accordance with GAAP have been condensed or omitted. Accordingly, these condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the related notes included in the Annual Report on Form 10-K for the fiscal year ended December 31, 2018 filed with the Securities and Exchange Commission (“SEC”) on February 28, 2019. The condensed consolidated financial statements are unaudited and have been prepared on a basis consistent with that used to prepare the audited annual consolidated financial statements and include, in the opinion of management, all adjustments, consisting of normal and recurring items, necessary for the fair statement of the condensed consolidated financial statements. The condensed consolidated balance sheet at December 31, 2018 was derived from audited financial statements, but does not include all disclosures required by GAAP. The operating results for the quarter and nine months ended September 30, 2019 are not necessarily indicative of the results expected for the full year ending December 31, 2019.

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.

Significant accounting policies

The Company’s significant accounting policies are detailed in “Note 2: Summary of Significant Accounting Policies" of the Company’s Annual Report on Form 10-K for the year ended December 31, 2018. Except as noted below, there have been no material changes to the Company’s significant accounting policies.

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 condensed consolidated balance sheets. Leases with an initial term of 12 months or less are not recorded on the condensed 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.

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 has not determined the impact of this guidance 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, and the adoption of this standard resulted in the Company capitalizing $0.3 million and $0.7 million, respectively, of implementation and consulting costs relating to its various hosting arrangements in the quarter and nine months ended September 30, 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 Accounting Standard Update (“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.

Leases

9 Months Ended

Sep. 30, 2019

Lessee Disclosure [Abstract]

Leases

Note 3 – Leases

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

	Quarter Ended September 30, 2019		Nine Months Ended September 30, 2019
Operating lease cost	$	1,402	$	4,390
Short-term lease cost		239		660
Variable cost		216		454
Total lease cost	$	1,857	$	5,504

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

Quarter Ended

September 30, 2019

Nine Months Ended

September 30, 2019

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

1,655

4,785

	September 30, 2019
Weighted-average remaining lease term - operating leases (in years)		4.3
Weighted-average discount rate - operating leases		6	%

Maturities of lease liabilities at September 30, 2019 was (in thousands):

2019 (remaining 3 months)	$	1,545
2020		5,352
2021		4,112
2022		3,062
2023		2,901
Thereafter		1,632
Total lease payments		18,604
Less imputed interest		(2,115	)
Total	$	16,489

At September 30, 2019, leases entered into that have not yet commenced were $0.2 million and are not reflected in the table above.

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

Redeemable Non-Controlling Interest

9 Months Ended

Sep. 30, 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 interests in BlackLine K.K. are classified outside of permanent equity in the Company’s condensed consolidated balance sheet, and the balance is reported at the greater of the initial carrying amount adjusted for the redeemable non-controlling interests’ 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 interests was $0.9 million at September 30, 2019.

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

	Quarter Ended September 30, 2019			Nine Months Ended September 30, 2019
Balance at beginning of period	$	4,118		$	4,387
Net loss attributable to redeemable non-controlling interest (excluding adjustment to non-controlling interest)		(509	)		(978	)
Foreign currency translation		5			151
Adjustment to redeemable non-controlling interest		839			893
Balance at end of period	$	4,453		$	4,453

Balance Sheet Components

9 Months Ended

Sep. 30, 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 condensed consolidated balance sheet consisted of the following:

	September 30, 2019
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(in thousands)
Marketable securities
U.S. treasury securities	$	33,202	$	52	$	—	$	33,254
Corporate bonds		20,276		72		—		20,348
Commercial paper		14,722		—		—		14,722
	$	68,200	$	124	$	—	$	68,324

	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 quarters and nine months ended September 30, 2019 and 2018 there were no material realized gains or losses related to sales of marketable securities recognized in the Company’s unaudited condensed consolidated statements of operations. Net gains and losses related to maturities of marketable securities that were reclassified from accumulated other comprehensive loss to earnings in the unaudited condensed consolidated statements of operations were $0.1 million and $0.7 million for the quarter and nine months ended September 30, 2019, respectively. Net gains and losses related to maturities of marketable securities that were reclassified from accumulated other comprehensive loss to earnings in the unaudited condensed consolidated statements of operations were $0.3 million and $0.6 million for the quarter and nine months ended September 30, 2018. Net gains and losses are determined using the specific identification method.

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:

	September 30, 2019
	Amortized Cost		Fair Value
	(in thousands)
Maturing within 1 year	$	62,648	$	62,772
Maturing between 1 and 2 years		5,552		5,552
	$	68,200	$	68,324

Prepaid Expenses and Other Current Assets

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

	September 30,		December 31,
	2019		2018
Partner referral fees	$	61	$	5,219
Other prepaid expenses and other current assets		10,813		8,823
	$	10,874	$	14,042

Other Assets

Other assets consisted of the following (in thousands):

	September 30,		December 31,
	2019		2018
Deferred customer contract acquisition costs	$	43,549	$	34,172
Restricted cash		243		274
Other assets		2,690		2,419
	$	46,482	$	36,865

Accrued Expenses and Other Current Liabilities

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

	September 30,		December 31,
	2019		2018
Accrued salaries and employee benefits	$	17,812	$	17,054
Accrued income and other taxes payable		4,084		4,547
Short-term tenant improvement allowance		—		475
Other accrued expenses and current liabilities		3,808		2,629
	$	25,704	$	24,705

Fair Value Measurements

9 Months Ended

Sep. 30, 2019

Fair Value Disclosures [Abstract]

Fair Value Measurements

Note 6 – 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):

	September 30, 2019
	Level 1		Level 2		Level 3		Total
Cash equivalents
Money market funds	$	25,104	$	—	$	—	$	25,104
Marketable securities
U.S. treasury securities		33,254		—		—		33,254
Corporate bonds		—		20,348		—		20,348
Commercial paper		—		14,722		—		14,722
Total assets	$	58,358	$	35,070	$	—	$	93,428
Liabilities
Contingent consideration	$	—	$	—	$	6,629	$	6,629
Total liabilities	$	—	$	—	$	6,629	$	6,629

	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):

	Quarter Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Beginning fair value	$	6,500	$	6,056	$	6,316	$	5,866
Change in fair value		129		97		313		287
Ending fair value	$	6,629	$	6,153	$	6,629	$	6,153

The fair value of contingent consideration is determined 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 the 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.

- 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

Convertible Senior Notes

9 Months Ended

Sep. 30, 2019

Debt Disclosure [Abstract]

Convertible Senior Notes

Note 7 – Convertible Senior Notes

On August 13, 2019, the Company sold $500.0 million, which includes the initial purchasers option of $65.0 million, aggregate principal amount of 0.125% Convertible Senior Notes due 2024 (the “Notes”) to the initial purchasers 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 separated the Notes into liability and equity components. The liability component was calculated by measuring the fair value of a similar liability that does not have an associated convertible feature. The equity component representing the conversion option was determined by deducting the fair value of the liability component from the principal amount of the Notes. 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.

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. Significant inputs used in the model to determine the applicable interest rate include expected volatility over the term of the Notes and selection of comparable companies.

The Notes consisted of the following (in thousands):

	September 30, 2019
Liability:
Principal	$	500,000
Unamortized debt discount and issuance costs		(121,144	)
Net carrying amount	$	378,856
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 condensed consolidated balance sheet and presents the fair value for disclosure purposes only. The estimated fair value of the Notes, based on a market approach as of September 30, 2019 was approximately $479.6 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 quarter and nine months ended September 30, 2019, the Company recognized $2.9 million of interest expense related to the amortization of debt discount and issuance costs and $0.1 million of coupon interest expense.

As of September 30, 2019, the remaining life of the Notes is approximately 58 months.

The Notes were not convertible as of September 30, 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 condensed 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.

Commitments and Contingencies

9 Months Ended

Sep. 30, 2019

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

Note 8 – Commitments and Contingencies

Contingent consideration—On September 3, 2013, BlackLine Systems, Inc. was acquired by BlackLine, Inc. (the “2013 Acquisition”). 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 $6.6 million and $6.3 million at September 30, 2019 and December 31, 2018, respectively.

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 September 30, 2019 and December 31, 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 is not probable or reasonably estimable.

Equity Awards

9 Months Ended

Sep. 30, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Equity Awards

Note 9 – Equity Awards

Stock-based compensation expense

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

	Quarter Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Cost of revenues	$	1,431	$	869	$	3,478	$	2,389
Sales and marketing		4,522		2,182		11,074		5,927
Research and development		1,452		651		3,631		1,755
General and administrative		2,736		1,638		6,422		4,636
	$	10,141	$	5,340	$	24,605	$	14,707

For each of the quarters ended September 30, 2019 and 2018, stock-based compensation capitalized as an asset was $0.1 million. For each of the nine months ended September 30, 2019 and 2018, stock-based compensation capitalized as an asset was $0.3 million.

Stock options

The following table summarizes activity for awards that contain service-only vesting conditions (in thousands):

Outstanding at December 31, 2018	3,820
Granted	480
Exercised	(552	)
Forfeited/canceled	(52	)
Outstanding at September 30, 2019	3,696

Restricted stock units

The following table summarizes activity for restricted stock units (in thousands):

Nonvested at December 31, 2018	1,300
Granted	875
Vested	(397	)
Forfeited/canceled	(86	)
Nonvested at September 30, 2019	1,692

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 each year are determined concurrently with the annual budget process and, at December 31, 2018, because each yearly target had not yet been set, no grant date for the options was established. 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 September 30, 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.

Unearned Revenue and Performance Obligations

9 Months Ended

Sep. 30, 2019

Unearned Revenue And Performance Obligations [Abstract]

Unearned Revenue and Performance Obligations

Note 10 – Unearned Revenue and Performance Obligations

Revenue totaling $117.8 million and $96.6 million was recognized during the nine months ended September 30, 2019 and 2018, respectively, that was previously included in the deferred revenue balance at December 31, 2018 and 2017, respectively.

Contracted not recognized revenue was $312.0 million at September 30, 2019, of which the Company expects to recognize approximately 64% over the next 12 months and the remainder thereafter.

Income Taxes

9 Months Ended

Sep. 30, 2019

Income Tax Disclosure [Abstract]

Income Taxes

Note 11 – Income Taxes

In determining quarterly provisions for income taxes, the Company uses the annual estimated effective tax rate applied to the actual year-to-date loss, adjusted for discrete items arising in that quarter. The Company’s annual estimated effective tax rate differs from the U.S. federal statutory rate of 21% primarily as a result of state taxes, foreign taxes, and changes in the Company’s valuation allowance for domestic income taxes. For the quarters ended September 30, 2019 and 2018, the Company recorded $0.2 million and $17,000, respectively, in income tax expense. For the quarters ended September 30, 2019 and 2018, the Company maintained a full valuation allowance on its U.S. federal and state net deferred tax assets as it was more likely than not that those deferred tax assets will not be realized.

For the nine months ended September 30, 2019 and 2018, the Company recorded $0.6 million and $0.1 million, respectively, in income tax expense. The increase in the income tax expense for the nine months ended September 30, 2019, compared to the nine months ended September 30, 2018, was related to a reduction in net operating losses in the Company’s foreign jurisdictions for the current period. For the nine months ended September 30, 2019 and 2018, the Company maintained a full valuation allowance on its U.S. federal and state net deferred tax assets as it was more likely than not that those deferred tax assets will not be realized.

Net Loss per Share

9 Months Ended

Sep. 30, 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):

	Quarter Ended September 30,						Nine Months Ended September 30,
	2019			2018			2019			2018
Numerator:
Net loss attributable to BlackLine, Inc.	$	(9,242	)	$	(4,460	)	$	(23,050	)	$	(20,072	)
Denominator:
Weighted average shares		55,480			54,263			55,164			53,660
Add: Dilutive effect of securities		—			—			—			—
Shares used to calculate diluted net loss per share		55,480			54,263			55,164			53,660
Basic net loss per share attributable to BlackLine, Inc.	$	(0.17	)	$	(0.08	)	$	(0.42	)	$	(0.37	)
Diluted net loss per share attributable to BlackLine, Inc.	$	(0.17	)	$	(0.08	)	$	(0.42	)	$	(0.37	)

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 (in thousands):

	September 30,
	2019		2018
Stock options with service-only vesting conditions		3,696		3,772
Stock options with performance conditions		683		683
Restricted stock units		1,692		1,202
Total shares excluded from net loss per share		6,071		5,657

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 quarter ended September 30, 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.

Geographic Information

9 Months Ended

Sep. 30, 2019

Segment Reporting [Abstract]

Geographic Information

Note 13 – Geographic Information

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):

	Quarter Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
United States	$	58,588	$	46,782	$	162,487	$	131,456
International		16,337		11,952		46,231		34,016
	$	74,925	$	58,734	$	208,718	$	165,472

Subsequent Events

9 Months Ended

Sep. 30, 2019

Subsequent Events [Abstract]

Subsequent Events

Note 14 – Subsequent Events

On November 5, 2019, the Company’s Compensation Committee approved restricted stock unit grants to employees totaling approximately 67,000 shares. Each restricted stock unit entitles the recipient to receive one share of

common stock upon vesting of the award. The restricted stock units will vest as to one-fourth of the total number of units awarded on the first anniversary of November 20, 2019 and quarterly thereafter for 12 consecutive quarters.

On November 5, 2019, the Company’s Stock Award Committee approved restricted stock unit grants to employees totaling 18,000 shares. Each restricted stock unit entitles the recipient to receive one share of common stock upon vesting of the award. The restricted stock units will vest as to one-fourth of the total number of units awarded on each of the first four anniversaries of November 20, 2019.

Basis of Presentation, Significant Accounting Policies and Recently-Issued Accounting Pronouncements (Policies)	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Use of Estimates	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.
Leases	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 condensed consolidated balance sheets. Leases with an initial term of 12 months or less are not recorded on the condensed 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.
Recently Issued Accounting Pronouncements Not Yet Adopted	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 has not determined the impact of this guidance 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	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, and the adoption of this standard resulted in the Company capitalizing $0.3 million and $0.7 million, respectively, of implementation and consulting costs relating to its various hosting arrangements in the quarter and nine months ended September 30, 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 Accounting Standard Update (“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.

Leases (Tables)

9 Months Ended

Sep. 30, 2019

Lessee Disclosure [Abstract]

Summary of Lease Expense

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

	Quarter Ended September 30, 2019		Nine Months Ended September 30, 2019
Operating lease cost	$	1,402	$	4,390
Short-term lease cost		239		660
Variable cost		216		454
Total lease cost	$	1,857	$	5,504

Summary of Supplemental Information Related to Leases

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

Quarter Ended

September 30, 2019

Nine Months Ended

September 30, 2019

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

1,655

4,785

	September 30, 2019
Weighted-average remaining lease term - operating leases (in years)		4.3
Weighted-average discount rate - operating leases		6	%

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

Maturities of lease liabilities at September 30, 2019 was (in thousands):

2019 (remaining 3 months)	$	1,545
2020		5,352
2021		4,112
2022		3,062
2023		2,901
Thereafter		1,632
Total lease payments		18,604
Less imputed interest		(2,115	)
Total	$	16,489

At September 30, 2019, leases entered into that have not yet commenced were $0.2 million and are not reflected in the table above.

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

Redeemable Non-Controlling Interest (Tables)

9 Months Ended

Sep. 30, 2019

Equity Method Investments And Joint Ventures [Abstract]

Summary of Redeemable Non-Controlling Interests

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

	Quarter Ended September 30, 2019			Nine Months Ended September 30, 2019
Balance at beginning of period	$	4,118		$	4,387
Net loss attributable to redeemable non-controlling interest (excluding adjustment to non-controlling interest)		(509	)		(978	)
Foreign currency translation		5			151
Adjustment to redeemable non-controlling interest		839			893
Balance at end of period	$	4,453		$	4,453

Balance Sheet Components (Tables)

9 Months Ended

Sep. 30, 2019

Balance Sheet Related Disclosures [Abstract]

Schedule of Investments in Marketable Securities

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

	September 30, 2019
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
	(in thousands)
Marketable securities
U.S. treasury securities	$	33,202	$	52	$	—	$	33,254
Corporate bonds		20,276		72		—		20,348
Commercial paper		14,722		—		—		14,722
	$	68,200	$	124	$	—	$	68,324

	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:

	September 30, 2019
	Amortized Cost		Fair Value
	(in thousands)
Maturing within 1 year	$	62,648	$	62,772
Maturing between 1 and 2 years		5,552		5,552
	$	68,200	$	68,324

Summary of Prepaid Expenses and Other Current Assets

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

	September 30,		December 31,
	2019		2018
Partner referral fees	$	61	$	5,219
Other prepaid expenses and other current assets		10,813		8,823
	$	10,874	$	14,042

Schedule of Other Assets

Other assets consisted of the following (in thousands):

	September 30,		December 31,
	2019		2018
Deferred customer contract acquisition costs	$	43,549	$	34,172
Restricted cash		243		274
Other assets		2,690		2,419
	$	46,482	$	36,865

Schedule of Accrued Expenses and Other Current Liabilities

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

	September 30,		December 31,
	2019		2018
Accrued salaries and employee benefits	$	17,812	$	17,054
Accrued income and other taxes payable		4,084		4,547
Short-term tenant improvement allowance		—		475
Other accrued expenses and current liabilities		3,808		2,629
	$	25,704	$	24,705

Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2019

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

	September 30, 2019
	Level 1		Level 2		Level 3		Total
Cash equivalents
Money market funds	$	25,104	$	—	$	—	$	25,104
Marketable securities
U.S. treasury securities		33,254		—		—		33,254
Corporate bonds		—		20,348		—		20,348
Commercial paper		—		14,722		—		14,722
Total assets	$	58,358	$	35,070	$	—	$	93,428
Liabilities
Contingent consideration	$	—	$	—	$	6,629	$	6,629
Total liabilities	$	—	$	—	$	6,629	$	6,629

	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):

	Quarter Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Beginning fair value	$	6,500	$	6,056	$	6,316	$	5,866
Change in fair value		129		97		313		287
Ending fair value	$	6,629	$	6,153	$	6,629	$	6,153

Convertible Senior Notes (Tables)

9 Months Ended

Sep. 30, 2019

Debt Disclosure [Abstract]

Summary of Notes

The Notes consisted of the following (in thousands):

	September 30, 2019
Liability:
Principal	$	500,000
Unamortized debt discount and issuance costs		(121,144	)
Net carrying amount	$	378,856
Carrying amount of the equity component	$	111,230

Equity Awards (Tables)

9 Months Ended

Sep. 30, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Stock-Based Compensation Expense

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

	Quarter Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Cost of revenues	$	1,431	$	869	$	3,478	$	2,389
Sales and marketing		4,522		2,182		11,074		5,927
Research and development		1,452		651		3,631		1,755
General and administrative		2,736		1,638		6,422		4,636
	$	10,141	$	5,340	$	24,605	$	14,707

Summary of Stock Options Activity

The following table summarizes activity for awards that contain service-only vesting conditions (in thousands):

Outstanding at December 31, 2018	3,820
Granted	480
Exercised	(552	)
Forfeited/canceled	(52	)
Outstanding at September 30, 2019	3,696

Summary of Restricted Stock Units Activity

The following table summarizes activity for restricted stock units (in thousands):

Nonvested at December 31, 2018	1,300
Granted	875
Vested	(397	)
Forfeited/canceled	(86	)
Nonvested at September 30, 2019	1,692

Net Loss per Share (Tables)

9 Months Ended

Sep. 30, 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):

	Quarter Ended September 30,						Nine Months Ended September 30,
	2019			2018			2019			2018
Numerator:
Net loss attributable to BlackLine, Inc.	$	(9,242	)	$	(4,460	)	$	(23,050	)	$	(20,072	)
Denominator:
Weighted average shares		55,480			54,263			55,164			53,660
Add: Dilutive effect of securities		—			—			—			—
Shares used to calculate diluted net loss per share		55,480			54,263			55,164			53,660
Basic net loss per share attributable to BlackLine, Inc.	$	(0.17	)	$	(0.08	)	$	(0.42	)	$	(0.37	)
Diluted net loss per share attributable to BlackLine, Inc.	$	(0.17	)	$	(0.08	)	$	(0.42	)	$	(0.37	)

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 (in thousands):

	September 30,
	2019		2018
Stock options with service-only vesting conditions		3,696		3,772
Stock options with performance conditions		683		683
Restricted stock units		1,692		1,202
Total shares excluded from net loss per share		6,071		5,657

Geographic Information (Tables)

9 Months Ended

Sep. 30, 2019

Segment Reporting [Abstract]

Schedule of Disaggregation of Revenues by Geographic Region

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

	Quarter Ended September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
United States	$	58,588	$	46,782	$	162,487	$	131,456
International		16,337		11,952		46,231		34,016
	$	74,925	$	58,734	$	208,718	$	165,472

Basis of Presentation, Significant Accounting Policies and Recently-Issued Accounting Pronouncements - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Jan. 01, 2019
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Operating lease right-of-use (“ROU”) assets	$ 13,381	$ 13,381	$ 14,900
Operating lease liabilities	16,489	$ 16,489	$ 18,300
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
Implementation and consulting costs	$ 300	$ 700
Minimum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Operating lease, remaining lease term	1 year	1 year
Maximum
Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items]
Operating lease, remaining lease term	6 years	6 years
Operating lease, extended lease term	10 years	10 years
Operating lease, termination period		1 year

Leases - Summary of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Lease Cost [Abstract]
Operating lease cost	$ 1,402	$ 4,390
Short-term lease cost	239	660
Variable cost	216	454
Total lease cost	$ 1,857	$ 5,504

Leases - Summary of Supplemental Information Related to Leases (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Leases [Abstract]
Cash paid for amounts included in the measurement of lease liabilities - operating leases	$ 1,655	$ 4,785
Weighted-average remaining lease term - operating leases (in years)	4 years 3 months 18 days	4 years 3 months 18 days
Weighted-average discount rate - operating leases	6.00%	6.00%

Leases - Schedule of Maturities of Lease Liabilities and Future Minimum Lease Payments Under Non-cancelable Operating Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating Lease Liabilities Payments Due [Abstract]
2019 (remaining 3 months)	$ 1,545
2019			$ 7,059
2020	5,352		5,307
2021	4,112		3,786
2022	3,062		2,586
2023	2,901		2,638
Thereafter	1,632		237
Total lease payments	18,604		$ 21,613
Less imputed interest	(2,115)
Total	$ 16,489	$ 18,300

Leases - Additional Information (Details) $ in Millions	Sep. 30, 2019 USD ($)
Leases [Abstract]
Lessee, operating leases, not yet commenced	$ 0.2

Redeemable Non-Controlling Interest - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
	Oct. 31, 2018	Sep. 30, 2019
Redeemable Noncontrolling Interest [Line Items]
Redeemable non-controlling interests		$ 0.9
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 Interests (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Equity Method Investments And Joint Ventures [Abstract]
Balance at beginning of period	$ 4,118	$ 4,387
Net loss attributable to redeemable non-controlling interest (excluding adjustment to non-controlling interest)	(509)	(978)
Foreign currency translation	5	151
Adjustment to redeemable non-controlling interest	839	893
Balance at end of period	$ 4,453	$ 4,453

Balance Sheet Components - Schedule of Investments in Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 68,200	$ 86,485
Gross Unrealized Gains	124
Gross Unrealized Losses		(89)
Fair Value	68,324	86,396
U.S. treasury securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	33,202	25,856
Gross Unrealized Gains	52
Gross Unrealized Losses		(29)
Fair Value	33,254	25,827
Corporate bonds
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	20,276	32,030
Gross Unrealized Gains	72
Gross Unrealized Losses		(60)
Fair Value	20,348	31,970
Commercial paper
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	14,722	28,599
Fair Value	$ 14,722	$ 28,599

Balance Sheet Components - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Schedule Of Available For Sale Securities [Line Items]
Realized gain and losses recognized	$ 0	$ 0	$ 0	$ 0
Net gains and losses on maturities of marketable securities reclassified from accumulated other comprehensive loss to earnings	$ 100,000	$ 300,000	$ 700,000	$ 600,000
Maximum
Schedule Of Available For Sale Securities [Line Items]
Marketable securities contractual maturity period			2 years

Balance Sheet Components - Summary of Amortized Cost and Fair Values of Marketable Securities, by Remaining Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract]
Maturing within 1 year	$ 62,648
Maturing between 1 and 2 years	5,552
Amortized Cost	68,200	$ 86,485
Maturing within 1 year	62,772
Maturing between 1 and 2 years	5,552
Total, Fair Value	$ 68,324

Balance Sheet Components - Summary of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract]
Partner referral fees	$ 61	$ 5,219
Other prepaid expenses and other current assets	10,813	8,823
Prepaid expenses and other current assets, Total	$ 10,874	$ 14,042

Balance Sheet Components - Summary of Other Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Balance Sheet Related Disclosures [Abstract]
Deferred customer contract acquisition costs	$ 43,549	$ 34,172
Restricted cash	243	274	$ 278
Other assets	2,690	2,419
Other Assets Noncurrent	$ 46,482	$ 36,865

Balance Sheet Components - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Payables And Accruals [Abstract]
Accrued salaries and employee benefits	$ 17,812	$ 17,054
Accrued income and other taxes payable	4,084	4,547
Short-term tenant improvement allowance		475
Other accrued expenses and current liabilities	3,808	2,629
Accrued expenses and other current liabilities	$ 25,704	$ 24,705

Fair Value Measurements - Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total assets	$ 93,428	$ 118,417
Liabilities
Contingent consideration	6,629	6,316
Total liabilities	6,629	6,316
Money market funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	25,104	32,021
U.S. treasury securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities	33,254	25,827
Corporate bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities	20,348	31,970
Commercial paper
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities	14,722	28,599
Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total assets	58,358	57,848
Level 1 \| Money market funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	25,104	32,021
Level 1 \| U.S. treasury securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities	33,254	25,827
Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total assets	35,070	60,569
Level 2 \| Corporate bonds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities	20,348	31,970
Level 2 \| Commercial paper
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Marketable securities	14,722	28,599
Level 3
Liabilities
Contingent consideration	6,629	6,316
Total liabilities	$ 6,629	$ 6,316

Fair Value Measurements - Summary of Changes in Contingent Consideration Liability (Details) - Contingent Consideration - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Beginning fair value	$ 6,500	$ 6,056	$ 6,316	$ 5,866
Change in fair value	129	97	313	287
Ending fair value	$ 6,629	$ 6,153	$ 6,629	$ 6,153

Convertible Senior Notes - Additional Information (Details) $ / shares in Units, $ in Thousands		3 Months Ended	9 Months Ended
	Aug. 13, 2019 USD ($) d $ / shares $ / Note shares	Sep. 30, 2019 USD ($) $ / shares	Sep. 30, 2019 USD ($) $ / shares
Debt Instrument [Line Items]
Initial conversion price \| $ / shares		$ 73.40	$ 73.40
Amortization of debt discount and issuance costs			$ 2,923
Capped calls cost			$ 46,200
Cap price per share \| $ / shares		$ 106.76	$ 106.76
0.125% Convertible Senior Notes Due 2024
Debt Instrument [Line Items]
Principal amount of convertible senior notes	$ 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%
Amortization of debt discount and issuance costs		$ 2,900	$ 2,900
Coupon interest expense		100	$ 100
Remaining life of notes			58 months
0.125% Convertible Senior Notes Due 2024 \| Level 2
Debt Instrument [Line Items]
Estimated fair value of convertible senior notes		$ 479,600	$ 479,600
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	Sep. 30, 2019 USD ($)
Debt Instrument [Line Items]
Principal	$ 500,000
Unamortized debt discount and issuance costs	(121,144)
Net carrying amount	378,856
Carrying amount of the equity component	$ 111,230

Commitments and Contingencies - Additional Information (Details) - BlackLine Systems, Inc. - USD ($) $ in Millions	Sep. 03, 2013	Sep. 30, 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		$ 6.6	$ 6.3

Equity Awards - Summary of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 10,141	$ 5,340	$ 24,605	$ 14,707
Cost of Revenues
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	1,431	869	3,478	2,389
Sales and Marketing
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	4,522	2,182	11,074	5,927
Research and Development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	1,452	651	3,631	1,755
General and Administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 2,736	$ 1,638	$ 6,422	$ 4,636

Equity Awards - Additional Information (Details)	1 Months Ended	3 Months Ended		9 Months Ended
Equity Awards - Additional Information (Details)	Oct. 31, 2016 USD ($) ExecutiveOfficer $ / shares shares	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) shares	Sep. 30, 2018 USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation capitalized as an asset		$ 100,000	$ 100,000	$ 300,000	$ 300,000
Stock options granted to purchase shares of common stock for employee \| shares				480,000
Stock-based compensation, cost		$ 10,141,000	$ 5,340,000	$ 24,605,000	$ 14,707,000
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of executive officers, options granted \| ExecutiveOfficer	2
Executive Officer \| Stock Options
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

Equity Awards - Summary of Stock Options Activity (Details) shares in Thousands	9 Months Ended
	Sep. 30, 2019 shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, Beginning balance	3,820
Granted	480
Exercised	(552)
Forfeited/canceled	(52)
Outstanding, Ending balance	3,696

Equity Awards - Summary of Restricted Stock Units Activity (Details) shares in Thousands	9 Months Ended
	Sep. 30, 2019 shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Restricted stock units, Nonvested, Beginning balance	1,300
Restricted stock units, Granted	875
Restricted stock units, Vested	(397)
Restricted stock units, Forfeited/canceled	(86)
Restricted stock units, Nonvested, Ending balance	1,692

Unearned Revenue and Performance Obligations - Additional Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Unearned Revenue And Performance Obligations [Abstract]
Deferred revenue recognized	$ 117.8	$ 96.6
Contracted not recognized revenue	$ 312.0
Contracted not recognized revenue, expects to recognize revenue over next 12 months	64.00%

Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Corporate tax rate			21.00%
Income tax expense	$ 206,000	$ 17,000	$ 557,000	$ 130,000

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		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator:
Net loss attributable to BlackLine, Inc.	$ (9,242)	$ (4,460)	$ (23,050)	$ (20,072)
Denominator:
Weighted average shares	55,480	54,263	55,164	53,660
Shares used to calculate diluted net loss per share	55,480	54,263	55,164	53,660
Basic net loss per share attributable to BlackLine, Inc.	$ (0.17)	$ (0.08)	$ (0.42)	$ (0.37)
Diluted net loss per share attributable to BlackLine, Inc.	$ (0.17)	$ (0.08)	$ (0.42)	$ (0.37)

- Definition

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

+ References

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+ Details

- 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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+ Details

- Definition

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 shares in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from net loss per share	6,071	5,657
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	3,696	3,772
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
Restricted stock units
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from net loss per share	1,692	1,202

Net Loss per Share - Additional Information (Details) - $ / shares shares in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share Basic [Line Items]
Conversion option in notes not considered in calculation of diluted net loss per share	6,071	5,657
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
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

Geographic Information - Schedule of Disaggregation of Revenues by Geographic Region (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disaggregation Of Revenue [Line Items]
Total revenues	$ 74,925	$ 58,734	$ 208,718	$ 165,472
United States
Disaggregation Of Revenue [Line Items]
Total revenues	58,588	46,782	162,487	131,456
International
Disaggregation Of Revenue [Line Items]
Total revenues	$ 16,337	$ 11,952	$ 46,231	$ 34,016

Subsequent Events - Additional Information (Details) - Restricted stock units - shares		9 Months Ended
	Nov. 05, 2019	Sep. 30, 2019
Compensation Committee
Subsequent Event [Line Items]
Vesting term		The restricted stock units will vest as to one-fourth of the total number of units awarded on the first anniversary of November 20, 2019 and quarterly thereafter for 12 consecutive quarters.
Stock Award Committee
Subsequent Event [Line Items]
Vesting term		The restricted stock units will vest as to one-fourth of the total number of units awarded on each of the first four anniversaries of November 20, 2019.
Subsequent Event \| Compensation Committee
Subsequent Event [Line Items]
Approved restricted stock unit grants to employees	67,000
Number of common stock entitled to receive upon vesting of award	1
Vesting percentage	25.00%
Subsequent Event \| Stock Award Committee
Subsequent Event [Line Items]
Approved restricted stock unit grants to employees	18,000
Number of common stock entitled to receive upon vesting of award	1
Vesting percentage	25.00%