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Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2016	Nov. 30, 2016
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2016
Document Fiscal Year Focus	2016
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	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		51,268,844

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 19,586	$ 15,205
Accounts receivable, net	36,761	24,235
Deferred sales commissions	7,229	6,246
Prepaid expenses and other current assets	4,456	2,801
Total current assets	68,032	48,487
Capitalized software development costs, net	4,113	2,967
Property and equipment, net	11,857	12,419
Intangible assets, net	57,434	56,828
Goodwill	185,052	163,154
Other assets	4,747	2,895
Total assets	331,235	286,750
Current liabilities:
Accounts payable	8,456	4,648
Accrued expenses and other current liabilities	17,485	15,012
Deferred revenue	69,774	52,750
Short-term portion of contingent consideration	2,008	2,008
Total current liabilities	97,723	74,418
Term loan, net	64,836	28,267
Common stock warrant liability	5,200	5,500
Contingent consideration	3,137	2,859
Deferred tax liabilities	3,874	5,907
Other long-term liabilities	3,917	3,631
Total liabilities	178,687	120,582
Commitments and contingencies (Note 7)
Stockholders' equity:
Common stock, $0.01 par value, 500,000,000 shares authorized, 41,316,829 issued and outstanding as of September 30, 2016 and 40,720,327 issued and 40,673,327 outstanding as of December 31, 2015	413	407
Treasury stock, 0 shares and 47,000 shares at cost at September 30, 2016 and December 31, 2015, respectively		(254)
Additional paid-in capital	223,805	214,171
Accumulated deficit	(71,670)	(48,156)
Total stockholders' equity	152,548	166,168
Total liabilities and stockholders' equity	$ 331,235	$ 286,750

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (PARENTHETICAL) - $ / shares	Sep. 30, 2016	Dec. 31, 2015
Statement Of Financial Position [Abstract]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	41,316,829	40,720,327
Common stock, shares outstanding	41,316,829	40,673,327
Treasury stock shares	0	47,000

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Revenues
Subscription and support	$ 30,853	$ 20,786	$ 83,830	$ 56,666
Professional services	1,343	875	3,953	2,467
Total revenues	32,196	21,661	87,783	59,133
Cost of revenues
Subscription and support	6,440	5,119	18,515	14,220
Professional services	1,101	824	3,029	2,162
Total cost of revenues	7,541	5,943	21,544	16,382
Gross profit	24,655	15,718	66,239	42,751
Operating expenses
Sales and marketing	19,037	14,740	56,279	39,694
Research and development	5,087	4,904	15,552	12,938
General and administrative	7,698	5,916	19,633	14,968
Total operating expenses	31,822	25,560	91,464	67,600
Loss from operations	(7,167)	(9,842)	(25,225)	(24,849)
Other expense
Interest expense, net	(1,294)	(822)	(3,134)	(2,466)
Change in fair value of the common stock warrant liability		80	300	(170)
Other expense, net	(1,294)	(742)	(2,834)	(2,636)
Loss before income taxes	(8,461)	(10,584)	(28,059)	(27,485)
Benefit from income taxes	(1,842)	(3,849)	(4,564)	(9,958)
Net loss	$ (6,619)	$ (6,735)	$ (23,495)	$ (17,527)
Net loss per share, basic and diluted	$ (0.16)	$ (0.17)	$ (0.58)	$ (0.43)
Weighted average common shares outstanding, basic and diluted	40,824,314	40,655,741	40,746,481	40,550,742

CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (UNAUDITED) - 9 months ended Sep. 30, 2016 - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock, at cost	Additional Paid-in Capital	Accumulated Deficit
Beginning Balance at Dec. 31, 2015	$ 166,168	$ 407	$ (254)	$ 214,171	$ (48,156)
Beginning Balance, shares at Dec. 31, 2015		40,673,327
Stock option exercises	$ 2,196	$ 4		2,192
Stock option exercises. shares	451,315	451,315
Common Stock Issuance	$ 3,075	$ 2		3,073
Common Stock Issuance, shares		192,187
Retirement of treasury stock			$ 254	(235)	(19)
Stock-based compensation	4,604			4,604
Net Loss	(23,495)				(23,495)
Ending Balance at Sep. 30, 2016	$ 152,548	$ 413		$ 223,805	$ (71,670)
Ending Balance, shares at Sep. 30, 2016		41,316,829

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities
Net Loss	$ (23,495)	$ (17,527)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	12,690	10,630
Accretion of debt discount and paid in kind interest	2,083	2,008
Change in fair value of common stock warrant liability	(300)	170
Change in fair value of contingent consideration	278	39
Stock-based compensation	4,534	3,870
Deferred income taxes	(4,820)	(10,018)
Changes in operating assets and liabilities, net of effects of the acquisition:
Accounts receivable	(9,933)	(6,939)
Deferred sales commissions	(983)	(2,560)
Prepaid expenses and other current assets	(936)	110
Other assets	(150)	(220)
Accounts payable	3,250	1,220
Accrued expenses and other current liabilities	1,886	4,558
Deferred revenue	17,535	12,467
Other long-term liabilities	(590)	2,042
Net cash provided by (used in) operating activities	1,049	(150)
Cash flows from investing activities
Acquisition, net of cash acquired	(31,488)
Capitalized software development costs	(2,326)	(1,506)
Purchase of property and equipment	(1,308)	(7,346)
Net cash used in investing activities	(35,122)	(8,852)
Cash flows from financing activities
Proceeds from term loan, net of issuance costs	34,469
Principal payments on capital lease obligations	(124)
Proceeds from issuance of common stock	3,075
Payments of deferred offering costs	(1,162)
Repurchase of common stock		(29)
Proceeds from exercise of stock options	2,196	1,339
Net cash provided by financing activities	38,454	1,310
Net increase (decrease) in cash and cash equivalents	4,381	(7,692)
Cash and cash equivalents, beginning of period	15,205	25,707
Cash and cash equivalents, end of period	19,586	18,015
Supplemental disclosures of cash flow information
Cash paid for interest	924	404
Cash paid for income taxes	176	13
Non-cash financing and investing activities
Capitalized software developed costs included in accounts payable and accrued expenses and other current liabilities	107	75
Purchases of property and equipment included in accounts payable and accrued expenses and other current liabilities	149	1,557
Stock-based compensation capitalized for software development	70	46
Deferred offering costs included in accounts payable and accrued expenses and other current liabilities	2,186	$ 203
Term loan issuance costs included in accounts payable and accrued expenses and other current liabilities	$ 143

Company Overview	9 Months Ended
Company Overview	Sep. 30, 2016
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 as Software as a Service (“SaaS”). The Company’s solutions enable its customers to address various aspects of their financial closing process including account reconciliations, variance analysis of account balances, journal entry capabilities and certain types of data matching capabilities. The Company is headquartered in Los Angeles, California and has offices in Chicago, Atlanta, New York, Vancouver, London, Paris, Frankfurt, Johannesburg, Sydney, Melbourne, Kuala Lumpur, the Netherlands and Singapore.

Basis of Presentation and Summary of Significant Accounting Policies

9 Months Ended

Sep. 30, 2016

Accounting Policies [Abstract]

Basis of Presentation and Summary of Significant Accounting Policies

Note 2 – Basis of presentation and summary of significant accounting policies

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 for the year ended December 31, 2015 included in the Company’s prospectus related to the Company’s initial public offering, dated October 27, 2016 (the “Prospectus”), pursuant to Rule 424 (b) under the Securities Act of 1933. The accompanying condensed consolidated balance sheet as of September 30, 2016, the condensed consolidated statements of operations for the three and nine months ended September 30, 2016 and 2015, the condensed consolidated statement of cash flows for the nine months ended September 30, 2016 and 2015, and the condensed consolidated statement of stockholders’ equity for the nine months ended September 30, 2016 are unaudited. The unaudited interim condensed consolidated financial statements 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 operating results for the nine months ended September 30, 2016 are not necessarily indicative of the results expected for the full year ending December 31, 2016.

There have been no significant changes in the accounting policies from those disclosed in the audited consolidated financial statements and the related notes presented in the Prospectus.

Reverse stock split

On October 12, 2016, the Company effected a 1-for-5 reverse stock split of its outstanding common stock. All share and per share amounts for all periods presented in these unaudited condensed consolidated financial statements and notes thereto, have been adjusted retrospectively, where applicable, to reflect this reverse stock split.

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. Actual amounts could differ from those estimates.

Business combinations

The results of businesses acquired in a business combination are included in the Company’s consolidated financial statements from the date of the acquisition. Purchase accounting results in assets and liabilities of an acquired business generally being recorded at their estimated fair values on the acquisition date. Any excess consideration over the fair value of assets acquired and liabilities assumed is recognized as goodwill.

Transaction costs associated with business combinations are expensed as incurred, and are included in general and administrative expense in the consolidated statements of operations.

The Company performs valuations of assets acquired and liabilities assumed and allocates the purchase price to its respective assets and liabilities. Determining the fair value of assets acquired and liabilities assumed requires management to use significant judgment and estimates including the selection of valuation methodologies, estimates of future revenue, costs and cash flows, discount rates and selection of comparable companies. The Company engages the assistance of valuation specialists in concluding on fair value measurements in connection with determining fair values of assets acquired and liabilities assumed in a business combination.

Intangible assets

Intangible assets primarily consist of acquired developed technology, customer relationships, trade name and non-complete agreements which were acquired as part of the Company’s acquisitions of BlackLine Systems, Inc in September 2013 and Runbook Company B.V. (“Runbook”) in August 2016. The Company determines the appropriate useful life of its intangible assets by performing an analysis of expected cash flows of the acquired assets. Intangible assets are amortized over their estimated useful lives using the straight-line method, which approximates the pattern in which the economic benefits are consumed. The estimated useful lives of the Company’s finite-lived intangible assets are as follows:

		Useful Lives
Trade name		1 - 10 years
Developed technology		6 - 8 years
Non-compete agreements		2 - 5 years
Customer relationships		8 - 10 years

Segments

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

Fair value of financial instruments

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

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

Level 1:

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

Level 2:

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

Level 3:

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

As of September 30, 2016 and December 31, 2015, the carrying value of cash equivalents, accounts receivable, accounts payable and accrued expenses, approximates fair value due to the short-term nature of such instruments. The carry value of long-term debt, excluding related debt discounts, approximates its fair value based on rates available to the Company for debt with similar terms and maturities.

The following table summarizes the Company’s financial assets and liabilities measured at fair value on a recurring basis as of September 30, 2016 and December 31, 2015 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, 2016
	Level 1		Level 2		Level 3		Total
Cash equivalents
Money market funds	$	14,470	$	—	$	—	$	14,470
Total Assets	$	14,470	$	—	$	—	$	14,470
Liabilities
Common stock warrant liability	$	—	$	—	$	5,200	$	5,200
Contingent consideration		—		—		5,145		5,145
Total Liabilities	$	—	$	—	$	10,345	$	10,345

	December 31, 2015
	Level 1		Level 2		Level 3		Total
Cash equivalents
Money market funds	$	15,990	$	—	$	—	$	15,990
Total Assets		15,990	$	—	$	—	$	15,990
Liabilities
Common stock warrant liability	$	—	$	—	$	5,500	$	5,500
Contingent consideration		—		—		4,867		4,867
Total Liabilities	$	—	$	—	$	10,367	$	10,367

There were no changes to the valuation techniques used to measure asset and liability fair values on a recurring basis during the nine months ended September 30, 2016.

The following table summarizes the changes in the common stock warrant liability and contingent consideration liability (in thousands) for the three and nine months ended September 30, 2016 and 2015:

	Contingent		Common Stock
	Consideration		Warrant Liability
Fair value as of June 30, 2016	$	5,010	$	5,200
Change in fair value		135		—
Fair value as of September 30, 2016	$	5,145	$	5,200

	Contingent		Common Stock
	Consideration		Warrant Liability
Fair value as of June 30, 2015	$	4,852	$	5,330
Change in fair value		13		(80	)
Fair value as of September 30, 2015	$	4,865	$	5,250

	Contingent		Common Stock
	Consideration		Warrant Liability
Fair value as of December 31, 2015	$	4,867	$	5,500
Change in fair value		278		(300	)
Fair value as of September 30, 2016	$	5,145	$	5,200

	Contingent		Common Stock
	Consideration		Warrant Liability
Fair value as of December 31, 2014	$	4,826	$	5,080
Change in fair value		39		170
Fair value as of September 30, 2015	$	4,865	$	5,250

Net loss per share

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

As of September 30, 2016 and 2015, the following potentially dilutive shares have been excluded from the calculation of diluted net loss per share attributable to common stockholders because they are anti-dilutive:

	September 30,
	2016		2015
Options to purchase common stock		5,246,516		5,797,676
Common stock warrants		499,999		499,999
Total shares excluded from net loss per share		5,746,515		6,297,675

Comprehensive income or loss

ASC 220, Comprehensive Income, establishes standards for the reporting and display of comprehensive income or loss and its components in the financial statements. For the three and nine months ended September 30, 2016 and 2015, the Company had no other comprehensive income (loss) items and therefore, comprehensive loss equaled net loss. Accordingly, a separate statement of comprehensive loss has not been presented.

Recently issued accounting standards

Under the Jumpstart Our Business Startups Act, or the JOBS Act, the Company meets the definition of an emerging growth company. The Company has irrevocably elected to opt out of the extended transition period for complying with new or revised accounting standards pursuant to Section 107(b) of the JOBS Act.

In May 2014, the Financial Accounting Standards Board (“FASB”) issued guidance related to revenue from contracts with customers. Under this guidance, revenue is recognized when promised goods or services are transferred to customers in an amount that reflects the consideration that is expected to be received for those goods or services. The updated standard will replace all existing revenue recognition guidance under GAAP when it becomes effective and this guidance can be applied either retrospectively to each prior reporting period presented (i.e., full retrospective adoption) or with the cumulative effect of initially applying the update recognized at the date of the initial application (i.e., modified retrospective adoption) along with additional disclosures. In July 2015, the FASB voted to defer the effective date to January 1, 2018, with early adoption beginning January 1, 2017. In March, April and May 2016, the FASB issued additional amendments to the new revenue guidance relating to reporting revenue on a gross versus net basis, identifying performance obligations and licensing arrangements, and other narrow scope improvements. The Company is evaluating the impact of adopting this guidance on its consolidated financial statements and has not selected the method of adoption.

In April 2015, the FASB issued new guidance related to the customer’s accounting for fees paid in a cloud computing arrangement, which provides guidance to customers about whether a cloud computing arrangement includes a software license. If a cloud computing arrangement includes a software license, then the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses. If a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. This guidance was effective for annual reporting periods beginning after December 15, 2015. The adoption of this guidance did not have a material impact on the Company’s consolidated financial statements.

In February 2016, the FASB issued new guidance which significantly changes the accounting for leases. The new guidance requires a lessee recognize in the balance sheet a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term. For leases with a term of 12 months or less, a lessee is permitted to make an accounting policy election by class of underlying asset not to recognize lease assets and lease liabilities. If a lessee makes this election, it should recognize lease expense for such leases generally on a straight-line basis over the lease term. For income statement purposes, the new guidance retained a dual model, requiring leases to be classified as either operating or financing. Operating leases will result in straight-line expense while finance leases will result in a front-loaded expense pattern similar to existing capital lease guidance. For statement of cash flow purposes, the new guidance also retained the existing dual method, where cash payments for operating leases are reflected in cash flows from operating activities and principal and interest payments for finance leases are reflected in cash flows from financing activities and cash flows from operating activities, respectively. The new guidance is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. The new guidance requires the recognition and measurement of leases at the beginning of the earliest period presented using a modified retrospective approach. The use of the modified retrospective approach allows an entity to use a number of practical expedients in the application of this new guidance. The Company is evaluating the impact of adopting this guidance on its consolidated financial statements.

In March 2016, the FASB issued new guidance to simplify various aspects relating to accounting for stock-based compensation and related tax impacts, the classification of excess tax benefits on the statement of cash flows, statutory tax withholding requirements and other stock based compensation classification matters. The guidance is effective for annual reporting periods beginning after December 15, 2016, and interim periods within those annual periods. Early adoption is permitted in any interim or annual period. All of the amendments in the new guidance must be adopted in the same period. The Company plans to adopt this guidance during the first quarter ended March 31, 2017, and the Company is evaluating the impact of this guidance on its consolidated financial statements.

In August 2016, the FASB issued cash flow guidance which addresses eight specific cash flow issues with the objective of reducing the existing diversity in practice, including presentation of cash flows relating to contingent consideration payments, debt prepayment and debt extinguishment costs, among other matters. This guidance is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. If adopted in an interim period, any adjustments should be reflected as of the beginning of the fiscal year that includes the interim period. The adoption of this guidance should be applied using a retrospective transition method to each period presented, unless impracticable to do so. The Company’s planned adoption of this guidance during the fourth quarter ended December 31, 2016 is not expected to impact previously reported cash flows. In November 2016, the Company paid debt prepayment costs of $0.7 million associated with the termination of its credit facility which will be presented as a financing cash outflow in the statement of cash flows for the fourth quarter ended December 31, 2016.

In November 2016, the FASB issued guidance which requires that restricted cash and restricted cash equivalents be included with cash and cash equivalents when reconciling the beginning and ending total amounts shown on the statement of cash flows. This guidance is effective for fiscal years beginning after December 15, 2017, and interim periods within those years and should be applied using a retrospective transition method to each period presented. Early adoption is permitted, including adoption in an interim period. If an entity early adopts the amendments in an interim period, any adjustments should be reflected as of the beginning of the fiscal year that includes that interim period. The Company has not yet determined the timing of adoption.

Business Combination

9 Months Ended

Sep. 30, 2016

Business Combinations [Abstract]

Business Combination

Note 3 – Business combination

On August 31, 2016, the Company acquired all the issued and outstanding capital stock of Runbook, a Netherlands-based provider of financial close automation software and integration solutions for SAP. The purpose of the acquisition was to enhance the Company’s position as a leading provider of software solutions to automate the financial close process for SAP customers and supports the Company’s European expansion strategy. The acquisition has been accounted for as a business combination under GAAP.

The total purchase consideration was approximately $34.1 million, subject to a final working capital adjustment, which was paid in cash. Upon the finalization of the working capital adjustment, the amount of the purchase price allocated to goodwill may change. A portion of the purchase price of $3.1 million was paid into escrow for indemnification obligations relating to potential breach of representations and warranties of the sellers and any amounts remaining in escrow after satisfaction of any resolved claims, will be released from escrow on the one-year anniversary of the acquisition. Acquisition related costs incurred by the Company of approximately $1.4 million were expensed as incurred.

The following table summarizes the estimated fair values of the assets acquired and liabilities assumed as of the date of the acquisition (in thousands):

Total consideration to selling shareholders	$	34,052
Assets acquired and liabilities assumed
Cash and cash equivalents		2,564
Accounts receivable		2,593
Prepaid expenses and other current assets		718
Property and equipment		427
Intangible assets		9,790
Accounts payable		(285	)
Accrued expenses and other current liabilities		(376	)
Deferred revenues		(489	)
Net deferred income tax liabilities		(2,787	)
Net assets		12,155
Goodwill	$	21,897

The Company believes the amount of goodwill resulting from the acquisition is primarily attributable to expected synergies from assembled workforce, an increase in development capabilities, increased offerings to customers, and enhanced opportunities for growth and innovation. The goodwill resulting from the acquisition is not tax deductible.

To determine the estimated fair value of intangible assets acquired, the Company engaged a third-party valuation specialist to assist management. The fair value measurements of the intangible assets were based primarily on significant unobservable inputs and thus represent a Level 3 measurement as defined in ASC 820. The acquired intangible asset categories, fair value and amortization periods, are as follows (in thousands):

	Amortization Period	Fair Value
Trade name	1 year		20
Developed technology	8 years		5,710
Non-compete agreements	2 years		180
Customer relationships	10 years		3,880
Total			9,790

The weighted average lives of intangible assets at the acquisition date was 8.7 years.

Pro forma information

The following table presents the Company’s pro forma total revenues, pro forma net loss and pro forma net loss per share, basic and diluted for the three and nine months ended September 30, 2016 and 2015 as if the acquisition occurred on January 1, 2015 (in thousands):

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2016			2015			2016			2015
Pro forma total revenues	$	33,808		$	22,656		$	92,856		$	62,117
Pro forma net loss		(5,535	)		(7,337	)		(23,391	)		(19,314	)
Pro forma net loss per share, basic and diluted		(0.14	)		(0.18	)		(0.57	)		(0.48	)

The pro forma results reflect certain adjustments for the depreciation and amortization of the fair values of the intangible assets acquired, adjustments to revenue resulting from the fair value adjustment to deferred revenue, acquisition related costs, and related tax adjustments. Such pro forma amounts are not necessarily indicative of the results that actually would have occurred had the acquisition been completed on the date indicated, nor is it indicative of the future operating results of the Company.

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1497-128463

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 805
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-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1490-128463

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-Section 50
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-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1392-128463

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e7008-128479

Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=65885119&loc=d3e1486-128463

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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
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-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 3
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Reference 10: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 2
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Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
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Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 4A
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Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 1
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Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
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-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6996-128479

+ Details

Accrued Expenses and Other Current Liabilities

9 Months Ended

Sep. 30, 2016

Payables And Accruals [Abstract]

Accrued Expenses and Other Current Liabilities

Note 4 – Accrued expenses and other current liabilities

As of September 30, 2016 and December 31, 2015, accrued expenses and other current liabilities comprise the following (in thousands):

	September 30,		December 31,
	2016		2015
Accrued salary and employee benefits	$	9,016	$	9,716
Accrued income and other taxes payable		2,173		1,047
Short-term portion of capital lease		558		558
Accrued commissions to third party partners		1,074		2,305
Deferred IPO costs		583		419
Accrued professional services costs		1,813		16
Short-term portion of deferred rent		340		—
Other accrued expenses		1,928		951
	$	17,485	$	15,012

Other Long-term Liabilities

9 Months Ended

Sep. 30, 2016

Other Liabilities Noncurrent [Abstract]

Other Long-term Liabilities

Note 5 – Other long-term liabilities

As of September 30, 2016 and December 31, 2015, accrued expenses and other current liabilities comprise the following (in thousands):

	September 30,		December 31,
	2016		2015
Deferred rent	$	2,483	$	3,073
Capital lease, net of current portion		434		558
Deferred revenue, net of current portion		1,000		—
	$	3,917	$	3,631

Term Loan, Net

9 Months Ended

Sep. 30, 2016

Debt Disclosure [Abstract]

Term loan, net

Note 6 – Term loan, net

In March 2016, the Company amended its credit facility to add an additional $5.0 million term loan (the “2016 Term Loan”) and provide for a $5.0 million revolving line of credit. In August 2016, the Company entered into a third amendment to its credit facility to add an additional $30.0 million term loan (the “2016 Acquisition Term Loan”) to fund the acquisition of Runbook. The additional $5.0 million borrowing under the 2016 Term Loan, $30.0 million under the 2016 Acquisition Term Loan and the revolving line of credit each mature in September 2018. The 2016 Term Loan and 2016 Acquisition Term Loan each bears interest at (i) the greater of LIBOR or 1.5% plus (ii) 8% and can be paid in varying amounts in cash or in kind. The revolving line of credit bears interest at (i) the greater of LIBOR or 0.5% plus (ii) 6%. The Company is also required to pay a commitment fee equal to 0.5% per annum of the unused portion of the revolving line of credit. No amounts were outstanding under the revolving line of credit at September 30, 2016.

The net carrying value of the Company’s borrowings under its term loans as of September 30, 2016 and December 31, 2015 consists of the following (in thousands):

	September 30,			December 31,
	2016			2015
Principal amount (including interest paid in kind)	$	66,418		$	29,648
Unamortized debt issuance costs and debt discount		(1,035	)		(627	)
Unamortized common stock warrant liability discount		(547	)		(754	)
Net carrying value	$	64,836		$	28,267

The credit facility is collateralized against all of the Company’s assets. In connection with certain events, including a change in control, or if the Company elects to repay the amounts outstanding under the term loans, the Company is required to pay a prepayment penalty.

In November 2016, the Company repaid the entire amounts owed under the credit facility, including prepayment penalty, and terminated the credit facility. See Note 10, “Subsequent events.”

Commitment and Contingencies	9 Months Ended
Commitment and Contingencies	Sep. 30, 2016
Commitments And Contingencies Disclosure [Abstract]
Commitments and contingencies	Note 7 – Commitments and contingencies Operating Leases - The Company has various non-cancelable operating leases for its corporate and international offices. These leases expire at various times through 2023. Certain lease agreements contain renewal options, rent abatement, and escalation clauses and entitle the Company to receive a tenant allowance from the landlord. The Company records tenant allowances as a deferred rent credit, which the Company amortizes on a straight-line basis, as a reduction of rent expense, over the term of the underlying lease. Contingent Consideration - On September 3, 2013, BlackLine Systems, Inc. was acquired by BlackLine, Inc. (the “Acquisition”). In conjunction with the 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 Acquisition. As a condition of the 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 Acquisition. The maximum contingent cash consideration to be distributed is $8.0 million. The fair value of the contingent consideration was $5.1 and $4.9 million as of September 30, 2016 and December 31, 2015, 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 our 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 we 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 have it been sued in connection with these indemnification arrangements. As of September 30, 2016 and December 31, 2015, 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.

Stock Options

9 Months Ended

Sep. 30, 2016

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock Options

Note 8 – Stock options

A summary of the Company’s stock option activity and related information for the nine months ended September 30, 2016 is as follows:

	Shares			Weighted Average Exercise Price
Outstanding, December 31, 2015		5,904,376		$	8.62
Granted		332,400			15.29
Exercised		(451,315	)		5.29
Forfeited		(538,945	)		7.13
Outstanding, September 30, 2016		5,246,516		$	9.49
Exercisable at September 30, 2016		1,642,934		$	8.21
Vested and expected to vest at September 30, 2016		4,727,612		$	9.52

Stock-based compensation expense for stock option awards for the three and nine months ended September 30, 2016 and 2015 were as follows (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2016		2015		2016		2015
Cost of revenues	$	150	$	126	$	425	$	351
Sales and marketing		501		602		1,834		1,747
Research and development		198		160		532		420
General and administrative		511		672		1,743		1,352
	$	1,360	$	1,560	$	4,534	$	3,870

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References + Details

Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Note 9 – Income taxes The Company uses an effective tax rate approach for calculating its tax benefit for the three and nine months ended September 30, 2016 and 2015. The effective tax rate for the three and nine months ended September 30, 2016 differs from the U.S. Federal statutory rate of 34% primarily because of state taxes, net of federal benefit, and valuation allowance for U.S. federal and state income taxes. The effective tax rate for the nine months ended September 30, 2015 differs from the U.S. federal statutory rate of 34% primarily as a result of state taxes, net of federal benefit, foreign taxes and a valuation allowance on State of California net deferred tax assets. The Company records a valuation allowance against its deferred tax assets to the extent that realization of the deferred tax assets, including consideration of its deferred tax liabilities, is not more likely than not. For the year ending December 31, 2016, for both federal and state income taxes, the Company’s deferred assets are estimated to exceed its deferred tax liabilities and because of the Company’s recent history of operating losses the Company believes that the realization of the deferred tax assets is currently not more likely than not. Accordingly, the Company has recorded a valuation allowance against its federal and state deferred tax assets. Taxes for international operations are not material for the nine months ended September 30, 2016 and 2015. As a result of the acquisition of Runbook, the Company recorded $0.4 million of federal and state deferred tax liabilities and released a corresponding amount of its valuation allowance on federal and state deferred tax assets for the three and nine months ended September 30, 2016.

Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2016
Subsequent Events [Abstract]
Subsequent Events	Note 10 – Subsequent events On October 17, 2016 and November 7, 2016, the Company granted stock options to purchase 1,394,345 shares and 28,975 shares, respectively, of common stock at an exercise price of $14.00 per share and $23.42 per share, respectively. A portion of the awards granted on October 17, 2016 will vest based on the achievement of certain performance metrics, and a portion of these awards will vest over a vesting period of 4 years. All awards granted on November 7, 2016 will vest over a vesting period of 4 years. On November 2, 2016, the Company completed its initial public offering in which it issued and sold 9,890,000 shares of its common stock, which included the exercise in full of the underwriters’ option to purchase an additional 1,290,000 shares, at an initial offering price of $17.00 per share. The Company received proceeds from the offering of approximately $151.7 million after deducting underwriting discounts and commissions and other offering expenses. On November 3, 2016, in connection with the completion of the Company’s initial public offering, the Company repaid in full all outstanding debt under the Company’s credit facility and terminated the entire credit arrangement. In connection with the termination of the credit arrangement, the Company paid a total of approximately $67.7 million, which included outstanding principal, interest, and prepayment penalties. Upon the repayment and termination of the credit arrangement, all unamortized discounts were recorded as interest expense.

Basis of Presentation and Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2016

Accounting Policies [Abstract]

Reserve Stock Split

Reverse stock split

Use of Estimates

Use of estimates

Business Combinations

Business combinations

Transaction costs associated with business combinations are expensed as incurred, and are included in general and administrative expense in the consolidated statements of operations.

Intangible Assets

Intangible assets

		Useful Lives
Trade name		1 - 10 years
Developed technology		6 - 8 years
Non-compete agreements		2 - 5 years
Customer relationships		8 - 10 years

Segments

Fair Value of Financial Instruments

Fair value of financial instruments

Level 1:

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

Level 2:

Level 3:

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

	September 30, 2016
	Level 1		Level 2		Level 3		Total
Cash equivalents
Money market funds	$	14,470	$	—	$	—	$	14,470
Total Assets	$	14,470	$	—	$	—	$	14,470
Liabilities
Common stock warrant liability	$	—	$	—	$	5,200	$	5,200
Contingent consideration		—		—		5,145		5,145
Total Liabilities	$	—	$	—	$	10,345	$	10,345

	December 31, 2015
	Level 1		Level 2		Level 3		Total
Cash equivalents
Money market funds	$	15,990	$	—	$	—	$	15,990
Total Assets		15,990	$	—	$	—	$	15,990
Liabilities
Common stock warrant liability	$	—	$	—	$	5,500	$	5,500
Contingent consideration		—		—		4,867		4,867
Total Liabilities	$	—	$	—	$	10,367	$	10,367

There were no changes to the valuation techniques used to measure asset and liability fair values on a recurring basis during the nine months ended September 30, 2016.

The following table summarizes the changes in the common stock warrant liability and contingent consideration liability (in thousands) for the three and nine months ended September 30, 2016 and 2015:

	Contingent		Common Stock
	Consideration		Warrant Liability
Fair value as of June 30, 2016	$	5,010	$	5,200
Change in fair value		135		—
Fair value as of September 30, 2016	$	5,145	$	5,200

	Contingent		Common Stock
	Consideration		Warrant Liability
Fair value as of June 30, 2015	$	4,852	$	5,330
Change in fair value		13		(80	)
Fair value as of September 30, 2015	$	4,865	$	5,250

	Contingent		Common Stock
	Consideration		Warrant Liability
Fair value as of December 31, 2015	$	4,867	$	5,500
Change in fair value		278		(300	)
Fair value as of September 30, 2016	$	5,145	$	5,200

	Contingent		Common Stock
	Consideration		Warrant Liability
Fair value as of December 31, 2014	$	4,826	$	5,080
Change in fair value		39		170
Fair value as of September 30, 2015	$	4,865	$	5,250

Net Loss Per Share

Net loss per share

	September 30,
	2016		2015
Options to purchase common stock		5,246,516		5,797,676
Common stock warrants		499,999		499,999
Total shares excluded from net loss per share		5,746,515		6,297,675

Comprehensive Income or Loss

Comprehensive income or loss

Recently Issued Accounting Standards

Recently issued accounting standards

Basis of Presentation and Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2016

Accounting Policies [Abstract]

Schedule of Estimated Useful Lives of Finite-Lived Intangible Assets

The estimated useful lives of the Company’s finite-lived intangible assets are as follows:

		Useful Lives
Trade name		1 - 10 years
Developed technology		6 - 8 years
Non-compete agreements		2 - 5 years
Customer relationships		8 - 10 years

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

	September 30, 2016
	Level 1		Level 2		Level 3		Total
Cash equivalents
Money market funds	$	14,470	$	—	$	—	$	14,470
Total Assets	$	14,470	$	—	$	—	$	14,470
Liabilities
Common stock warrant liability	$	—	$	—	$	5,200	$	5,200
Contingent consideration		—		—		5,145		5,145
Total Liabilities	$	—	$	—	$	10,345	$	10,345

	December 31, 2015
	Level 1		Level 2		Level 3		Total
Cash equivalents
Money market funds	$	15,990	$	—	$	—	$	15,990
Total Assets		15,990	$	—	$	—	$	15,990
Liabilities
Common stock warrant liability	$	—	$	—	$	5,500	$	5,500
Contingent consideration		—		—		4,867		4,867
Total Liabilities	$	—	$	—	$	10,367	$	10,367

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

The following table summarizes the changes in the common stock warrant liability and contingent consideration liability (in thousands) for the three and nine months ended September 30, 2016 and 2015:

	Contingent		Common Stock
	Consideration		Warrant Liability
Fair value as of June 30, 2016	$	5,010	$	5,200
Change in fair value		135		—
Fair value as of September 30, 2016	$	5,145	$	5,200

	Contingent		Common Stock
	Consideration		Warrant Liability
Fair value as of June 30, 2015	$	4,852	$	5,330
Change in fair value		13		(80	)
Fair value as of September 30, 2015	$	4,865	$	5,250

	Contingent		Common Stock
	Consideration		Warrant Liability
Fair value as of December 31, 2015	$	4,867	$	5,500
Change in fair value		278		(300	)
Fair value as of September 30, 2016	$	5,145	$	5,200

	Contingent		Common Stock
	Consideration		Warrant Liability
Fair value as of December 31, 2014	$	4,826	$	5,080
Change in fair value		39		170
Fair value as of September 30, 2015	$	4,865	$	5,250

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

	September 30,
	2016		2015
Options to purchase common stock		5,246,516		5,797,676
Common stock warrants		499,999		499,999
Total shares excluded from net loss per share		5,746,515		6,297,675

Business Combination (Tables)

9 Months Ended

Sep. 30, 2016

Business Combinations [Abstract]

Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed

The following table summarizes the estimated fair values of the assets acquired and liabilities assumed as of the date of the acquisition (in thousands):

Total consideration to selling shareholders	$	34,052
Assets acquired and liabilities assumed
Cash and cash equivalents		2,564
Accounts receivable		2,593
Prepaid expenses and other current assets		718
Property and equipment		427
Intangible assets		9,790
Accounts payable		(285	)
Accrued expenses and other current liabilities		(376	)
Deferred revenues		(489	)
Net deferred income tax liabilities		(2,787	)
Net assets		12,155
Goodwill	$	21,897

Schedule of Acquired Intangible Asset Categories, Fair Value and Amortization Periods

The acquired intangible asset categories, fair value and amortization periods, are as follows (in thousands):

	Amortization Period	Fair Value
Trade name	1 year		20
Developed technology	8 years		5,710
Non-compete agreements	2 years		180
Customer relationships	10 years		3,880
Total			9,790

Schedule of Pro Forma Total Revenues, Pro Forma Net Loss and Pro Forma Net Loss Per Share, Basic and Diluted

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2016			2015			2016			2015
Pro forma total revenues	$	33,808		$	22,656		$	92,856		$	62,117
Pro forma net loss		(5,535	)		(7,337	)		(23,391	)		(19,314	)
Pro forma net loss per share, basic and diluted		(0.14	)		(0.18	)		(0.57	)		(0.48	)

Accrued Expenses and Other Current Liabilities (Tables)

9 Months Ended

Sep. 30, 2016

Payables And Accruals [Abstract]

Schedule of Accrued Expenses and Other Current Liabilities

As of September 30, 2016 and December 31, 2015, accrued expenses and other current liabilities comprise the following (in thousands):

	September 30,		December 31,
	2016		2015
Accrued salary and employee benefits	$	9,016	$	9,716
Accrued income and other taxes payable		2,173		1,047
Short-term portion of capital lease		558		558
Accrued commissions to third party partners		1,074		2,305
Deferred IPO costs		583		419
Accrued professional services costs		1,813		16
Short-term portion of deferred rent		340		—
Other accrued expenses		1,928		951
	$	17,485	$	15,012

Other Long-term Liabilities (Tables)

9 Months Ended

Sep. 30, 2016

Other Liabilities Noncurrent [Abstract]

Schedule of Other Long-term Liabilities

As of September 30, 2016 and December 31, 2015, accrued expenses and other current liabilities comprise the following (in thousands):

	September 30,		December 31,
	2016		2015
Deferred rent	$	2,483	$	3,073
Capital lease, net of current portion		434		558
Deferred revenue, net of current portion		1,000		—
	$	3,917	$	3,631

Term Loan, Net (Tables)

9 Months Ended

Sep. 30, 2016

2016 Term Loan

Schedule of Net Carrying Value of Borrowings Under Term Loan

The net carrying value of the Company’s borrowings under its term loans as of September 30, 2016 and December 31, 2015 consists of the following (in thousands):

	September 30,			December 31,
	2016			2015
Principal amount (including interest paid in kind)	$	66,418		$	29,648
Unamortized debt issuance costs and debt discount		(1,035	)		(627	)
Unamortized common stock warrant liability discount		(547	)		(754	)
Net carrying value	$	64,836		$	28,267

Stock Options (Tables)

9 Months Ended

Sep. 30, 2016

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Stock Option Activity

A summary of the Company’s stock option activity and related information for the nine months ended September 30, 2016 is as follows:

	Shares			Weighted Average Exercise Price
Outstanding, December 31, 2015		5,904,376		$	8.62
Granted		332,400			15.29
Exercised		(451,315	)		5.29
Forfeited		(538,945	)		7.13
Outstanding, September 30, 2016		5,246,516		$	9.49
Exercisable at September 30, 2016		1,642,934		$	8.21
Vested and expected to vest at September 30, 2016		4,727,612		$	9.52

Summary of Stock-Based Compensation Expense

Stock-based compensation expense for stock option awards for the three and nine months ended September 30, 2016 and 2015 were as follows (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2016		2015		2016		2015
Cost of revenues	$	150	$	126	$	425	$	351
Sales and marketing		501		602		1,834		1,747
Research and development		198		160		532		420
General and administrative		511		672		1,743		1,352
	$	1,360	$	1,560	$	4,534	$	3,870

Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details) $ in Millions		1 Months Ended	9 Months Ended
	Oct. 12, 2016	Nov. 30, 2016 USD ($)	Sep. 30, 2016 Segment
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]
Reverse stock split description			1-for-5 reverse stock split
Number of operating segments \| Segment			1
Subsequent Event
Basis of Presentation and Summary of Significant Accounting Policies [Line Items]
Reverse stock split ratio	0.2
Debt prepayment costs \| $		$ 0.7

Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Estimated Useful Lives of Finite-Lived Intangible Assets (Details)	9 Months Ended
	Sep. 30, 2016
Trade name \| Minimum
Finite Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	1 year
Trade name \| Maximum
Finite Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	10 years
Developed technology \| Minimum
Finite Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	6 years
Developed technology \| Maximum
Finite Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	8 years
Non-compete agreements \| Minimum
Finite Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	2 years
Non-compete agreements \| Maximum
Finite Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	5 years
Customer relationships \| Minimum
Finite Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	8 years
Customer relationships \| Maximum
Finite Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	10 years

Basis of Presentation and Summary of Significant Accounting Policies - Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Assets	$ 14,470	$ 15,990
Liabilities
Common stock warrant liability	5,200	5,500
Contingent consideration	5,145	4,867
Total Liabilities	10,345	10,367
Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Total Assets	14,470	15,990
Level 3
Liabilities
Common stock warrant liability	5,200	5,500
Contingent consideration	5,145	4,867
Total Liabilities	10,345	10,367
Money market funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	14,470	15,990
Money market funds \| Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cash equivalents	$ 14,470	$ 15,990

Basis of Presentation and Summary of Significant Accounting Policies - Summary of Changes in Common Stock Warrant Liability and Contingent Consideration Liability (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Contingent Consideration
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair value, beginning balance	$ 5,010	$ 4,852	$ 4,867	$ 4,826
Change in fair value	135	13	278	39
Fair value, ending balance	5,145	4,865	5,145	4,865
Common Stock Warrant Liability
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]
Fair value, beginning balance	5,200	5,330	5,500	5,080
Change in fair value		(80)	(300)	170
Fair value, ending balance	$ 5,200	$ 5,250	$ 5,200	$ 5,250

Basis of Presentation and Summary of Significant Accounting Policies - Schedule of Potentially Dilutive Shares Excluded From Calculation of Diluted Net Loss Per Share Attributable to Common Stockholders (Details) - shares	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from net loss per share	5,746,515	6,297,675
Options to purchase common stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from net loss per share	5,246,516	5,797,676
Common stock warrants
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from net loss per share	499,999	499,999

Business Combinations - Additional Information (Details) - Runbook Company B.V. - USD ($) $ in Thousands		9 Months Ended
	Aug. 31, 2016	Sep. 30, 2016
Business Acquisition [Line Items]
Date of acquisition		Aug. 31, 2016
Total purchase consideration	$ 34,052
Escrow amount	3,100
Escrow deposit maturity, description		Upon the finalization of the working capital adjustment, the amount of the purchase price allocated to goodwill may change. A portion of the purchase price of $3.1 million was paid into escrow for indemnification obligations relating to potential breach of representations and warranties of the sellers and any amounts remaining in escrow after satisfaction of any resolved claims, will be released from escrow on the one-year anniversary of the acquisition.
Acquisition related costs	$ 1,400
Weighted average lives of intangible assets	8 years 8 months 12 days

Business Combination - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Aug. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Assets acquired and liabilities assumed
Goodwill		$ 185,052	$ 163,154
Runbook Company B.V.
Business Acquisition [Line Items]
Total purchase consideration	$ 34,052
Assets acquired and liabilities assumed
Cash and cash equivalents	2,564
Accounts receivable	2,593
Prepaid expenses and other current assets	718
Property and equipment	427
Intangible assets	9,790
Accounts payable	(285)
Accrued expenses and other current liabilities	(376)
Deferred revenues	(489)
Net deferred income tax liabilities	(2,787)
Net assets	12,155
Goodwill	$ 21,897

Business Combinations - Schedule of Acquired Intangible Asset Categories, Fair Value and Amortization Periods (Details) - Runbook Company B.V. $ in Thousands	Aug. 31, 2016 USD ($)
Finite Lived Intangible Assets [Line Items]
Amortization Period	8 years 8 months 12 days
Fair Value	$ 9,790
Trade name
Finite Lived Intangible Assets [Line Items]
Amortization Period	1 year
Fair Value	$ 20
Developed technology
Finite Lived Intangible Assets [Line Items]
Amortization Period	8 years
Fair Value	$ 5,710
Non-compete agreements
Finite Lived Intangible Assets [Line Items]
Amortization Period	2 years
Fair Value	$ 180
Customer relationships
Finite Lived Intangible Assets [Line Items]
Amortization Period	10 years
Fair Value	$ 3,880

Business Combination - Schedule of Pro Forma Total Revenues, Pro Forma Net Loss and Pro Forma Net Loss Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Business Combinations [Abstract]
Pro forma total revenues	$ 33,808	$ 22,656	$ 92,856	$ 62,117
Pro forma net loss	$ (5,535)	$ (7,337)	$ (23,391)	$ (19,314)
Pro forma net loss per share, basic and diluted	$ (0.14)	$ (0.18)	$ (0.57)	$ (0.48)

Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Payables And Accruals [Abstract]
Accrued salary and employee benefits	$ 9,016	$ 9,716
Accrued income and other taxes payable	2,173	1,047
Short-term portion of capital lease	558	558
Accrued commissions to third party partners	1,074	2,305
Deferred IPO costs	583	419
Accrued professional services costs	1,813	16
Short-term portion of deferred rent	340
Other accrued expenses	1,928	951
Accrued expenses	$ 17,485	$ 15,012

Other Long-term Liabilities - Schedule of Other Long-term Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Other Liabilities Noncurrent [Abstract]
Deferred rent	$ 2,483	$ 3,073
Capital lease, net of current portion	434	558
Deferred revenue, net of current portion	1,000
Other long-term liabilities	$ 3,917	$ 3,631

- Definition

The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References + Details

Term Loan, Net - Additional Information (Details) - USD ($)	1 Months Ended		9 Months Ended
	Aug. 31, 2016	Mar. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Credit facility, outstanding amount			$ 64,836,000	$ 28,267,000
2016 Term Loan
Debt Instrument [Line Items]
Credit facility additional amount to carrying value		$ 5,000,000
Credit facility maturity date		2018-09
Credit facility, description of interest rate basis			the greater of LIBOR or 1.5% plus (ii) 8% and can be paid in varying amounts in cash or in kind.
Credit facility, basis spread on interest rate		1.50%
Credit facility, interest rate		8.00%
2016 Acquisition Term Loan
Debt Instrument [Line Items]
Credit facility additional amount to carrying value	$ 30,000,000
Credit facility maturity date	2018-09
Credit facility, description of interest rate basis			the greater of LIBOR or 1.5% plus (ii) 8% and can be paid in varying amounts in cash or in kind.
Credit facility, basis spread on interest rate	1.50%
Credit facility, interest rate	8.00%
Revolving Line of Credit
Debt Instrument [Line Items]
Credit facility additional amount to carrying value		$ 5,000,000
Credit facility maturity date		2018-09
Credit facility, description of interest rate basis			(i) the greater of LIBOR or 0.5% plus (ii) 6%
Credit facility, basis spread on interest rate		0.50%
Credit facility, interest rate		6.00%
Commitment fee percentage		0.50%
Credit facility, outstanding amount			$ 0

Term Loan, Net - Schedule of Net Carrying Value of Borrowings Under Term Loan (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Debt Instruments [Abstract]
Principal amount (including interest paid in kind)	$ 66,418	$ 29,648
Unamortized debt issuance costs and debt discount	(1,035)	(627)
Unamortized common stock warrant liability discount	(547)	(754)
Net carrying value	$ 64,836	$ 28,267

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References + Details

Commitment and Contingencies - Additional Information (Details) - USD ($)		9 Months Ended
	Sep. 03, 2013	Sep. 30, 2016	Dec. 31, 2015
Business Acquisition Contingent Consideration [Line Items]
Lease expiration year		2023
BlackLine Systems, Inc.
Business Acquisition Contingent Consideration [Line Items]
Maximum contingent cash consideration to be distributed	$ 8,000,000
BlackLine Systems, Inc. \| Contingent Consideration
Business Acquisition Contingent Consideration [Line Items]
Fair value of contingent consideration		$ 5,100,000	$ 4,900,000

Stock Options - Summary of Stock Option Activity (Details)	9 Months Ended
	Sep. 30, 2016 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Shares, Outstanding, Beginning balance \| shares	5,904,376
Shares, Granted \| shares	332,400
Shares, Exercised \| shares	(451,315)
Shares, Forfeited \| shares	(538,945)
Shares, Outstanding, Ending balance \| shares	5,246,516
Shares, Exercisable at September 30, 2016 \| shares	1,642,934
Shares, Vested and expected to vest at September 30, 2016 \| shares	4,727,612
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted Average Exercise Price, Outstanding, Beginning balance \| $ / shares	$ 8.62
Weighted Average Exercise Price, Granted \| $ / shares	15.29
Weighted Average Exercise Price, Exercised \| $ / shares	5.29
Weighted Average Exercise Price, Forfeited \| $ / shares	7.13
Weighted Average Exercise Price, Outstanding, Ending balance \| $ / shares	9.49
Weighted Average Exercise Price, Exercisable at September 30, 2016 \| $ / shares	8.21
Weighted Average Exercise Price, Vested and expected to vest at September 30, 2016 \| $ / shares	$ 9.52

Stock Options - Summary of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 1,360	$ 1,560	$ 4,534	$ 3,870
Cost of Revenues
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	150	126	425	351
Sales and Marketing
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	501	602	1,834	1,747
Research and Development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	198	160	532	420
General and Administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 511	$ 672	$ 1,743	$ 1,352

Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Income Tax Examination [Line Items]
U.S. Federal statutory rate	34.00%	34.00%	34.00%
Federal and state deferred tax liabilities	$ 3,874	$ 3,874		$ 5,907
Runbook Company B.V.
Income Tax Examination [Line Items]
Federal and state deferred tax liabilities	400	400
Federal and state deferred tax assets, valuation allowance	$ 400	$ 400

Subsequent Events - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions					9 Months Ended
	Nov. 07, 2016	Nov. 03, 2016	Nov. 02, 2016	Oct. 17, 2016	Sep. 30, 2016
Subsequent Event [Line Items]
Stock options granted to purchase shares of common stock					332,400
Stock options granted to purchase shares of common stock, exercise price					$ 15.29
Subsequent Event
Subsequent Event [Line Items]
Stock options granted to purchase shares of common stock	28,975			1,394,345
Stock options granted to purchase shares of common stock, exercise price	$ 23.42			$ 14.00
Awards vesting period (in years)	4 years			4 years
Proceeds from offering			$ 151.7
Repayment of outstanding debt		$ 67.7
Subsequent Event \| Initial Public Offering
Subsequent Event [Line Items]
Common stock, shares issued and sold including shares issued upon exercise of underwriters overallotment			9,890,000
Common stock, shares issued and sold price per share including shares issued upon exercise of underwriters overallotment			$ 17.00
Shares issued during period, exercise of underwriter option to purchase shares			1,290,000