BlackLine (BL) 10-Q 3 Nov 23 2023 Q3 Quarterly report Financial data

Cover

Cover - shares	9 Months Ended
	Sep. 30, 2023	Oct. 31, 2023
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2023
Document Transition Report	false
Entity File Number	001-37924
Entity Registrant Name	BlackLine, Inc.
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
Title of 12(b) Security	Common stock, par value $0.01 per share
Trading Symbol	BL
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		61,269,812
Amendment Flag	false
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Entity Central Index Key	0001666134
Current Fiscal Year End Date	--12-31

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 236,248	$ 200,968
Marketable securities (amortized cost of $926,620 and $875,456 at September 30, 2023 and December 31, 2022, respectively)	925,721	874,083
Accounts receivable, net of allowances of $4,434 and $2,282 at September 30, 2023 and December 31, 2022, respectively	130,477	150,858
Prepaid expenses and other current assets	26,694	23,658
Total current assets	1,319,140	1,249,567
Capitalized software development costs, net	36,899	32,070
Property and equipment, net	15,289	19,811
Intangible assets, net	84,305	90,864
Goodwill	448,987	443,861
Operating lease right-of-use assets	19,937	14,708
Other assets	91,578	92,775
Total assets	2,016,135	1,943,656
Current liabilities:
Accounts payable	4,802	14,964
Accrued expenses and other current liabilities	61,352	58,600
Deferred revenue, current	277,804	279,325
Finance lease liabilities, current	930	989
Operating lease liabilities, current	4,065	5,943
Convertible Debt, Current	248,904	0
Contingent consideration, current	8,000	8,000
Total current liabilities	605,857	367,821
Finance lease liabilities, noncurrent	109	785
Operating lease liabilities, noncurrent	16,399	9,292
Convertible senior notes, net, noncurrent	1,139,539	1,384,306
Contingent consideration, noncurrent	0	33,549
Deferred tax liabilities, net	6,022	5,568
Deferred revenue, noncurrent	697	343
Other long-term liabilities	3,975	6,229
Total liabilities	1,772,598	1,807,893
Commitments and contingencies (Note 13)
Redeemable non-controlling interest (Note 3)	27,806	23,895
Stockholders' equity:
Common stock, $0.01 par value, 500,000,000 shares authorized, 61,268,312 and 60,016,824 issued and outstanding at September 30, 2023 and December 31, 2022, respectively	613	600
Additional paid-in capital	455,038	385,709
Accumulated other comprehensive loss	(1,159)	(1,472)
Accumulated deficit	(238,761)	(272,969)
Total stockholders' equity	215,731	111,868
Total liabilities, redeemable non-controlling interest, and stockholders' equity	$ 2,016,135	$ 1,943,656

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (PARENTHETICAL) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Amortized cost	$ 926,620	$ 875,456
Allowances for credit losses	$ 4,434	$ 2,282
Common stock, par value (in usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	500,000,000	500,000,000
Common stock, shares, issued (in shares)	61,268,312	60,016,824
Common stock, shares, outstanding (in shares)	61,268,312	60,016,824

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenues
Total revenues	$ 150,708	$ 134,268	$ 434,266	$ 382,981
Cost of revenues
Total cost of revenues	36,794	32,426	109,181	96,022
Gross profit	113,914	101,842	325,085	286,959
Operating expenses
Sales and marketing	61,576	64,540	186,256	190,567
Research and development	26,722	27,721	80,629	80,871
General and administrative	18,026	31,000	46,854	74,997
Restructuring costs	8,664	0	9,813	0
Total operating expenses	114,988	123,261	323,552	346,435
Income (loss) from operations	(1,074)	(21,419)	1,533	(59,476)
Other income (expense)
Interest income	14,030	4,387	37,237	6,620
Interest expense	(1,489)	(1,482)	(4,414)	(4,386)
Other income, net	12,541	2,905	32,823	2,234
Income (loss) before income taxes	11,467	(18,514)	34,356	(57,242)
Provision for (benefit from) income taxes	(2,005)	474	(451)	(12,852)
Net income (loss)	13,472	(18,988)	34,807	(44,390)
Net income (loss) attributable to redeemable non-controlling interest	194	(344)	599	(468)
Adjustment attributable to redeemable non-controlling interest	1,355	1,375	3,444	(3,227)
Net income (loss) attributable to BlackLine, Inc.	$ 11,923	$ (20,019)	$ 30,764	$ (40,695)
Basic net income (loss) per share attributable to BlackLine, Inc. (in usd per share)	$ 0.20	$ (0.34)	$ 0.51	$ (0.68)
Shares used to calculate basic net income (loss) per share (in shares)	61,101	59,695	60,666	59,422
Diluted net income (loss) per share attributable to BlackLine, Inc. (in usd per share)	$ 0.19	$ (0.34)	$ 0.49	$ (0.68)
Shares used to calculate diluted net income (loss) per share (in shares)	72,102	59,695	71,902	59,422
Subscription and support
Revenues
Total revenues	$ 142,054	$ 126,081	$ 408,361	$ 360,289
Cost of revenues
Total cost of revenues	30,793	25,544	89,935	75,495
Professional services
Revenues
Total revenues	8,654	8,187	25,905	22,692
Cost of revenues
Total cost of revenues	$ 6,001	$ 6,882	$ 19,246	$ 20,527

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 13,472	$ (18,988)	$ 34,807	$ (44,390)
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, 2023 and 2022	408	(2,052)	474	(2,942)
Foreign currency translation	(69)	(147)	(293)	(845)
Other comprehensive income (loss)	339	(2,199)	181	(3,787)
Comprehensive income (loss)	13,811	(21,187)	34,988	(48,177)
Less comprehensive income (loss) attributable to redeemable non-controlling interest:
Net income (loss) attributable to redeemable non-controlling interest	194	(344)	599	(468)
Foreign currency translation attributable to redeemable non-controlling interest	(31)	(71)	(132)	(409)
Comprehensive income (loss) attributable to redeemable non-controlling interest	163	(415)	467	(877)
Comprehensive income (loss) attributable to BlackLine, Inc.	$ 13,648	$ (20,772)	$ 34,521	$ (47,300)

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED) (PARENTHETICAL) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net change in unrealized gains (losses) on marketable securities, tax	$ 0	$ 0	$ 0	$ 0

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjusted Balance	Common Stock	Common Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Additional Paid-in Capital	Additional Paid-in Capital Cumulative Effect, Period of Adoption, Adjustment	Additional Paid-in Capital Cumulative Effect, Period of Adoption, Adjusted Balance	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Period of Adoption, Adjusted Balance	Accumulated Deficit	Accumulated Deficit Cumulative Effect, Period of Adoption, Adjustment	Accumulated Deficit Cumulative Effect, Period of Adoption, Adjusted Balance
Beginning Balance (in shares) at Dec. 31, 2021				58,984	58,984
Beginning Balance at Dec. 31, 2021	$ 325,036	$ (262,130)	$ 62,906	$ 590	$ 590	$ 625,883	$ (324,418)	$ 301,465	$ 298	$ 298	$ (301,735)	$ 62,288	$ (239,447)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option exercises (in shares)				202
Stock option exercises	3,664			$ 2		3,662
Vesting of restricted stock units (in shares)				492
Vesting of restricted stock units	5			$ 5		0
Issuance of common stock through employee stock purchase plan (in shares)				98
Issuance of common stock through employee stock purchase plan	4,466			$ 1		4,465
Acquisition of common stock for tax withholding obligations	(7,866)					(7,866)
Stock-based compensation	58,829					58,829
Other comprehensive loss	(3,378)								(3,378)
Net income (loss) attributable to BlackLine, Inc., including adjustment to redeemable non-controlling interest	(40,695)					3,227					(43,922)
Ending Balance (in shares) at Sep. 30, 2022				59,776
Ending Balance at Sep. 30, 2022	77,931			$ 598		363,782			(3,080)		(283,369)
Beginning Balance (in shares) at Jun. 30, 2022				59,573
Beginning Balance at Jun. 30, 2022	79,183			$ 596		344,264			(952)		(264,725)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option exercises (in shares)				85
Stock option exercises	1,248			$ 1		1,247
Vesting of restricted stock units (in shares)				118
Vesting of restricted stock units	1			$ 1
Acquisition of common stock for tax withholding obligations	(1,864)					(1,864)
Stock-based compensation	21,510					21,510
Other comprehensive loss	(2,128)								(2,128)
Net income (loss) attributable to BlackLine, Inc., including adjustment to redeemable non-controlling interest	(20,019)					(1,375)					(18,644)
Ending Balance (in shares) at Sep. 30, 2022				59,776
Ending Balance at Sep. 30, 2022	77,931			$ 598		363,782			(3,080)		(283,369)
Beginning Balance (in shares) at Dec. 31, 2022				60,017
Beginning Balance at Dec. 31, 2022	111,868			$ 600		385,709			(1,472)		(272,969)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option exercises (in shares)				528
Stock option exercises	18,981			$ 6		18,975
Vesting of restricted stock units (in shares)				607
Vesting of restricted stock units	6			$ 6
Issuance of common stock through employee stock purchase plan (in shares)				116
Issuance of common stock through employee stock purchase plan	5,291			$ 1		5,290
Acquisition of common stock for tax withholding obligations	(14,144)					(14,144)
Stock-based compensation	62,652					62,652					0
Other comprehensive loss	313								313
Net income (loss) attributable to BlackLine, Inc., including adjustment to redeemable non-controlling interest	30,764					(3,444)					34,208
Ending Balance (in shares) at Sep. 30, 2023				61,268
Ending Balance at Sep. 30, 2023	215,731			$ 613		455,038			(1,159)		(238,761)
Beginning Balance (in shares) at Jun. 30, 2023				60,947
Beginning Balance at Jun. 30, 2023	176,362			$ 610		429,320			(1,529)		(252,039)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option exercises (in shares)				169
Stock option exercises	7,066			$ 2		7,064
Vesting of restricted stock units (in shares)				152
Vesting of restricted stock units	1			$ 1
Acquisition of common stock for tax withholding obligations	(722)					(722)
Stock-based compensation	20,731					20,731
Other comprehensive loss	370								370
Net income (loss) attributable to BlackLine, Inc., including adjustment to redeemable non-controlling interest	11,923					(1,355)					13,278
Ending Balance (in shares) at Sep. 30, 2023				61,268
Ending Balance at Sep. 30, 2023	$ 215,731			$ 613		$ 455,038			$ (1,159)		$ (238,761)

CONDENSED CONSOLIDATED STATEM_5

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities
Net income (loss) attributable to BlackLine, Inc.	$ 30,764	$ (40,695)
Net income (loss) and adjustment attributable to redeemable non-controlling interest (Note 3)	4,043	(3,695)
Net income (loss)	34,807	(44,390)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	37,274	30,986
Change in fair value of contingent consideration	(33,549)	(14,113)
Amortization of debt issuance costs	4,137	4,119
Stock-based compensation	60,465	57,410
Noncash lease expense	4,725	4,186
Accretion of purchase discounts on marketable securities, net	(24,999)	(3,326)
Net foreign currency (gains) losses	882	(1,463)
Deferred income taxes	(1,806)	(14,695)
Provision for (benefit from) credit losses	(17)	85
Changes in operating assets and liabilities, net of impact of acquisition:
Accounts receivable	20,445	18,321
Prepaid expenses and other current assets	(2,150)	2,239
Other assets	1,352	(6,355)
Accounts payable	(9,445)	(4,571)
Accrued expenses and other current liabilities	1,187	(612)
Deferred revenue	(1,265)	2,548
Operating lease liabilities	(5,235)	(5,329)
Lease incentive receipts	240	653
Other long-term liabilities	(2,604)	4,566
Net cash provided by operating activities	84,444	30,259
Cash flows from investing activities
Purchases of marketable securities	(982,465)	(1,171,808)
Proceeds from maturities of marketable securities	956,300	975,750
Capitalized software development costs	(16,837)	(14,952)
Purchases of property and equipment	(3,927)	(9,742)
Acquisition, net of cash acquired	(11,367)	(157,738)
Net cash used in investing activities	(58,296)	(378,490)
Cash flows from financing activities
Principal payments under finance lease obligations	(735)	(380)
Proceeds from exercises of stock options	18,987	3,669
Proceeds from employee stock purchase plan	5,291	4,466
Acquisition of common stock for tax withholding obligations	(14,144)	(7,866)
Financed purchases of property and equipment	0	(84)
Net cash provided by (used in) financing activities	9,399	(195)
Effect of foreign currency exchange rate changes on cash, cash equivalents, and restricted cash	(271)	(833)
Net increase (decrease) in cash, cash equivalents, and restricted cash	35,276	(349,259)
Cash, cash equivalents, and restricted cash, beginning of period	201,207	539,991
Cash, cash equivalents, and restricted cash, end of period	236,483	190,732
Reconciliation of cash, cash equivalents, and restricted cash to the consolidated balance sheets
Cash and cash equivalents at end of period	236,248	190,514
Restricted cash included within other assets at end of period	235	218
Total cash, cash equivalents, and restricted cash at end of period shown in the consolidated statements of cash flows	236,483	190,732
Non-cash financing and investing activities
Adjustment for adoption of ASU 2020-06	0	262,130
Estimated fair value of contingent consideration	0	55,947
Stock-based compensation capitalized for software development	2,628	1,675
Capitalized software development costs included in accounts payable and accrued expenses and other current liabilities at end of period	1,086	1,150
Purchases of property and equipment included in accounts payable and accrued expenses and other current liabilities at end of period	4	263
Leasehold improvements paid directly by landlord	$ 271	$ 0

The Company

The Company	9 Months Ended
	Sep. 30, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract]
The Company	The Company BlackLine, Inc. and its subsidiaries (the “Company” or “BlackLine”) provide financial accounting close solutions delivered primarily as Software as a Service (“SaaS”). The Company’s solutions enable its customers to address various aspects of their financial close process including account reconciliations, variance analysis of account balances, journal entry capabilities, and certain types of data matching capabilities. The Company is a holding company and conducts its operations through its wholly-owned subsidiary, BlackLine Systems, Inc. (“BlackLine Systems”). BlackLine Systems funded its business with investments from its founder and cash flows from operations until September 3, 2013, when the Company acquired BlackLine Systems, and Silver Lake Sumeru and Iconiq acquired a controlling interest in the Company, which is referred to as the “2013 Acquisition." On September 12, 2023, the Company acquired Data Interconnect ("DI"), hereinafter referred to as the "DI Acquisition". DI is a cloud-based Invoice-to-Cash automation vendor within the electronic invoice presentment and payment ("EIPP") market. The primary purpose of the DI Acquisition was to enhance the Company's existing accounts receivable automation solution by adding the EIPP capabilities. This acquisition was not a significant acquisition under Regulation S-X. On January 26, 2022, the Company acquired FourQ Systems, Inc. (“FourQ”), hereinafter referred to as the “FourQ Acquisition.” The primary purpose of the FourQ Acquisition was to enhance our existing intercompany accounting automation capabilities by driving end-to-end automation of traditionally manual intercompany accounting processes. The purchase accounting allocation was finalized during the quarter ended March 31, 2023. Refer to the Annual Report on Form 10-K for the fiscal year ended December 31, 2022, which was filed with the Securities and Exchange Commission (“SEC”) on February 23, 2023 for additional information. The Company is headquartered in Woodland Hills, California. On June 15, 2023, the Company entered into a five-year lease extension for the office in Woodland Hills. This extension increased both the right-of-use asset and lease liability by approximately $7.3 million. The Company has other local offices in Pleasanton, California; New York, New York; and Westport, Connecticut. We also have international office locations in Australia, Canada, France, Germany, India, Japan, the Netherlands, Poland, Romania, Singapore, and the United Kingdom.

Basis of Presentation, Signific

Basis of Presentation, Significant Accounting Policies and Recently-Issued Accounting Pronouncements	9 Months Ended
	Sep. 30, 2023
Accounting Policies [Abstract]
Basis of Presentation, Significant Accounting Policies and Recently-Issued Accounting Pronouncements	Basis of Presentation, Significant Accounting Policies and Recently-Issued Accounting Pronouncements The accompanying unaudited 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 unaudited 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, 2022, which was filed with the Securities and Exchange Commission (“SEC”) on February 23, 2023. The unaudited 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 unaudited condensed consolidated balance sheet at December 31, 2022 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, 2023 are not necessarily indicative of the results expected for the full year ending December 31, 2023. Use of estimates The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the dates of the consolidated financial statements, and the reported amounts of revenues and expenses during the reporting period. On an ongoing basis, management evaluates its estimates, primarily those related to determining the stand-alone selling price for separate deliverables in the Company’s subscription revenue arrangements, allowance for doubtful accounts, cancellations and credits, fair value of assets and liabilities assumed in a business combination, recoverability of goodwill and long-lived assets, useful lives associated with long-lived assets and right-of-use assets, income taxes, contingencies, fair value of contingent consideration, fair value of the Notes (as defined in "Note 8 - Convertible Senior Notes"), redemption value of redeemable non-controlling interest, and the valuation and assumptions underlying stock-based compensation. These estimates are based on historical data and experience, as well as various other factors that management believes to be reasonable under the circumstances. Actual results could differ from those estimates. The Company assessed certain accounting matters that generally require consideration of forecasted financial information in context with the information reasonably available to the Company at September 30, 2023 and through the date of this report. The accounting matters assessed included, but were not limited to, the Company’s valuation of contingent consideration, the allowance for credit losses, and the carrying value of goodwill and other long-lived assets. While there was not a material impact to the Company’s condensed consolidated financial statements for the quarter and nine months ended September 30, 2023, the Company’s future assessment of these accounting matters and other factors could result in material impacts to the Company’s consolidated financial statements in future reporting periods. Significant accounting policies The Company’s significant accounting policies are detailed in “Note 2 - Significant Accounting Policies" of the Company’s Annual Report on Form 10-K for the year ended December 31, 2022. There have been no material changes to the Company’s significant accounting policies. Recently-adopted accounting pronouncements There have been no recently adopted accounting pronouncements since the filing of the Company's Annual Report on Form 10-K for the year ended December 31, 2022. Recently-issued accounting pronouncements The Company has evaluated all recent accounting pronouncements and believes that none of them will have a material effect on the company’s financial statements.

Redeemable Non-Controlling Inte

Redeemable Non-Controlling Interest	9 Months Ended
	Sep. 30, 2023
Equity Method Investments and Joint Ventures [Abstract]
Redeemable Non-Controlling Interest	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. In November 2021, the Company made a further investment in BlackLine K.K. of $2.3 million that, including additional investments in BlackLine K.K. of $2.2 million by existing third-party investors in November 2021, maintained the Company's majority ownership of 51%. As the Company continues to control a majority stake in BlackLine K.K., the entity has been consolidated. All of the common stock held by the Investors is callable by the Company or puttable by the Investors upon certain contingent events. Should the call or put option be exercised, the redemption value will be determined based upon a prescribed formula derived from the discrete revenues of BlackLine K.K. and the Company and may be settled, at the Company’s discretion, with Company stock or cash. As a result of the put right available to the Investors in the future, the redeemable non-controlling interest in BlackLine K.K. is classified outside of permanent equity in the Company’s consolidated balance sheets, and the balance is reported at the greater of the initial carrying amount adjusted for the redeemable non-controlling interest's share of earnings, or its estimated redemption value. The resulting changes in the estimated redemption amount are recorded within retained earnings or, in the absence of retained earnings, additional paid-in-capital. The following table summarizes the activity in the redeemable non-controlling interest for the periods (in thousands): Quarter Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Balance at beginning of period $ 26,288 $ 23,635 $ 23,895 $ 28,699 Net income (loss) attributable to redeemable non-controlling interest (excluding adjustment to non-controlling interest) 194 (344) 599 (468) Foreign currency translation (31) (71) (132) (409) Adjustment to redeemable non-controlling interest 1,355 1,375 3,444 (3,227) Balance at end of period $ 27,806 $ 24,595 $ 27,806 $ 24,595

Business Combinations

Business Combinations	9 Months Ended
	Sep. 30, 2023
Business Combination and Asset Acquisition [Abstract]
Business Combinations	Business Combinations Acquisition of Data Interconnect On September 12, 2023 the Company completed the DI Acquisition for cash consideration of $11.4 million, which was paid at the closing of the acquisition. The DI Acquisition enhances the Company's existing accounts receivable automation solution capabilities through EIPP. Transaction-related costs, which include, but are not limited to, accounting, legal, and advisory fees related to the transaction, incurred by the Company totaling approximately $1.1 million were expensed as incurred during the quarter ended September 30, 2023. The Company accounted for the transaction as a business combination using the acquisition method of accounting. The total purchase price was allocated to the tangible and identifiable intangible assets acquired and liabilities assumed based on their respective estimated fair values on the acquisition date. The purchase price allocation is preliminary. The purchase consideration and major classes of assets and liabilities to which the Company allocated the total fair value of purchase consideration of $11.4 million were as follows (in thousands): Total cash purchase consideration $ 11,394 Cash and cash equivalents $ 27 Accounts receivable, net 916 Prepaid expenses and other current assets 893 Property and equipment, net 132 Intangible assets, net 8,800 Goodwill 5,126 Operating lease right-of-use assets 402 Other assets 58 Accounts payable (665) Accrued expenses and other current liabilities (1,636) Deferred revenue, current (98) Operating lease liabilities (402) Deferred tax liabilities, net (2,159) Total consideration $ 11,394 The Company believes the amount of goodwill resulting from the acquisition is primarily attributable to 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. All estimates, key assumptions, and forecasts were either provided by, or reviewed by, the Company. While the Company chose to utilize a third-party valuation specialist for assistance, the fair value analysis and related valuations reflect the conclusions of the Company and not those of any third party. 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, Fair Value Measurement . The acquired intangible asset categories, fair value, and amortization periods, were as follows: Amortization Period Fair Value (in years) (in thousands) Developed technology 5 $ 8,110 Customer relationships 3 690 $ 8,800 The weighted average lives of intangible assets at the acquisition date was 4.8 years. The estimated fair value of developed technology and customer relationships acquired of $8.1 million and $0.7 million, respectively, was determined through the use of a third-party valuation firm using the cost approach methodology. The cost approach considers the cost to replace (or reproduce) the assets and the effects on the assets' values of functional and/or economic obsolescence that has occurred with respect to the asset. The direct transaction costs of the acquisition were accounted for separately from the business combination and expensed as incurred. The revenue and earnings of the acquired business were included in the Company’s results since the acquisition date and have not been presented separately using pro forma revenues and results of operations as its impact is not material to the Company’s condensed consolidated financial statements for the periods presented.

Intangible Assets and Goodwill

Intangible Assets and Goodwill	9 Months Ended
	Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets and Goodwill	Intangible Assets and Goodwill The carrying value of intangible assets was as follows (in thousands): September 30, 2023 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Trade name $ 15,977 $ (15,977) $ — Developed technology 137,368 (63,481) 73,887 Customer relationships 26,779 (17,591) 9,188 Defensive patent 2,333 (1,103) 1,230 $ 182,457 $ (98,152) $ 84,305 December 31, 2022 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Trade name $ 15,977 $ (14,913) $ 1,064 Developed technology 129,258 (54,462) 74,796 Customer relationships 26,089 (12,552) 13,537 Defensive patent 2,333 (866) 1,467 $ 173,657 $ (82,793) $ 90,864 The following table represents the changes in goodwill (in thousands): Balance at December 31, 2022 $ 443,861 Additions from acquisitions 5,126 Balance at September 30, 2023 $ 448,987

Balance Sheet Components

Balance Sheet Components	9 Months Ended
	Sep. 30, 2023
Balance Sheet Related Disclosures [Abstract]
Balance Sheet Components	Balance Sheet Components Investments in Marketable Securities Investments in marketable securities presented within current assets on the condensed consolidated balance sheets consisted of the following (in thousands): September 30, 2023 Amortized Gross Gross Fair Value Marketable securities U.S. treasury securities $ 478,149 $ 10 $ (562) $ 477,597 Commercial paper 276,038 1 — 276,039 U.S. government agencies 172,433 5 (353) 172,085 $ 926,620 $ 16 $ (915) $ 925,721 December 31, 2022 Amortized Gross Gross Fair Value Marketable securities U.S. treasury securities $ 418,941 $ 9 $ (1,047) $ 417,903 Corporate bonds 64,597 3 (296) 64,304 Commercial paper 278,406 — — 278,406 U.S. government agencies 113,512 40 (82) 113,470 $ 875,456 $ 52 $ (1,425) $ 874,083 The Company’s marketable securities as of September 30, 2023 have a contractual maturity of less than 2 years. All of our available-for-sale securities are available for use in our current operations and are categorized as current assets even though the stated maturity of some individual securities may be one year or more beyond the balance sheet date. The fair values of available-for-sale securities, by remaining contractual maturity, were as follows (in thousands): September 30, 2023 Amortized Cost Fair Value Maturing within 1 year $ 915,828 $ 915,016 Maturing between 1 and 2 years 10,792 10,705 $ 926,620 $ 925,721 Refer to "Note 7 - Fair Value Measurements" for additional information. Net gains and losses related to maturities of marketable securities that were reclassified from accumulated other comprehensive loss to earnings and included in interest income in the accompanying condensed consolidated statements of operations, were $9.2 million and $25.0 million for the quarter and nine months ended September 30, 2023 and $2.8 million and $3.3 million for the quarter and nine months ended September 30, 2022. Net gains and losses are determined using the specific identification method. During the quarters and nine months ended September 30, 2023 and 2022, there were no realized gains or losses related to sales of marketable securities recognized in the Company's accompanying condensed consolidated statements of operations. Marketable securities in a continuous loss position for less than 12 months had an estimated fair value of $555.4 million and $521.8 million, and unrealized losses of $0.9 million and $1.4 million, at September 30, 2023 and December 31, 2022, respectively. There were no marketable securities in a continuous loss position for greater than 12 months at September 30, 2023 and December 31, 2022, respectively. The Company's marketable securities are considered to be of high credit quality and accordingly, there was no allowance for credit losses related to marketable securities as of September 30, 2023 or December 31, 2022. Other Assets Deferred customer contract acquisition costs are included in other assets in the accompanying condensed consolidated balance sheets and totaled $87.6 million and $89.1 million at September 30, 2023 and December 31, 2022, respectively. Accrued Expenses and Other Current Liabilities Accrued expenses and other current liabilities were comprised of the following (in thousands): September 30, December 31, Accrued salaries and employee benefits $ 31,888 $ 39,043 Accrued income and other taxes payable 7,446 9,415 Accrued restructuring costs 6,333 1,737 Other accrued expenses and current liabilities 15,685 8,405 $ 61,352 $ 58,600

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2023
Fair Value Disclosures [Abstract]
Fair Value Measurements	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, 2023 Level 1 Level 2 Level 3 Total Cash equivalents Money market funds $ 160,511 $ — $ — $ 160,511 Commercial paper — 20,788 — 20,788 Marketable securities U.S. treasury securities 477,597 — — 477,597 Commercial paper — 276,039 — 276,039 U.S. government agencies — 172,085 — 172,085 Total assets $ 638,108 $ 468,912 $ — $ 1,107,020 Liabilities Contingent consideration $ 8,000 $ — $ — $ 8,000 Total liabilities $ 8,000 $ — $ — $ 8,000 December 31, 2022 Level 1 Level 2 Level 3 Total Cash equivalents Money market funds $ 101,919 $ — $ — $ 101,919 Commercial paper — 59,405 — 59,405 Marketable securities U.S. treasury securities 417,903 — — 417,903 Corporate bonds — 64,301 — 64,301 Commercial paper — 278,406 — 278,406 U.S. government agencies — 113,471 — 113,471 Total assets $ 519,822 $ 515,583 $ — $ 1,035,405 Liabilities Contingent consideration $ 8,000 $ — $ 33,549 $ 41,549 Total liabilities $ 8,000 $ — $ 33,549 $ 41,549 The following table summarizes the changes in the contingent consideration liability (in thousands): Quarter Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Beginning fair value $ 19,120 $ 60,821 $ 41,549 $ 20,732 Additions in the period — — — 55,947 Change in fair value (11,120) 1,745 (33,549) (14,113) Ending fair value $ 8,000 $ 62,566 $ 8,000 $ 62,566 The Company classified the marketable debt securities as available-for-sale debt securities at the time of purchase and reevaluated such classification as of each balance sheet date. The valuation techniques used to measure the fair values of our instruments that were classified as Level 1 were derived from quoted market prices for identical instruments in active markets. The valuation techniques used to measure the fair values of Level 2 instruments were derived from broker reports that utilized quoted market prices for similar instruments. As a condition of the FourQ Acquisition that occurred on January 26, 2022, the Company agreed to pay additional cash consideration if FourQ realized certain firm-specific targets, including the amount and timing of new and incremental combined bookings from FourQ and BlackLine, and revenues from a specified FourQ customer over a three-year period subsequent to the acquisition date. The maximum cash consideration to be distributed is $73.2 million. Changes in the significant inputs used in the fair value measurement, specifically a change in new and incremental actual and forecasted combined bookings from FourQ and the Company, can significantly impact the fair value of the contingent consideration liability. During the quarter ended September 30, 2023, the Company reduced the FourQ contingent consideration by $11.1 million to zero. 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 obligated to pay additional cash consideration to certain equity holders since the Company realized taxable income for the year ended December 31, 2022. The maximum contingent cash consideration payable of $8.0 million is due on or before November 15, 2023. Accordingly, at September 30, 2023, the additional cash consideration was classified as a Level 1 liability. Changes in the fair value of contingent consideration are recorded as general and administrative expenses in the unaudited condensed consolidated statements of operations.

Convertible Senior Notes

Convertible Senior Notes	9 Months Ended
	Sep. 30, 2023
Debt Disclosure [Abstract]
Convertible Senior Notes	Convertible Senior Notes 2024 Notes The 0.125% Convertible Senior Notes due 2024 (the "2024 Notes") consisted of the following (in thousands): September 30, December 31, Liability: Principal $ 250,000 $ 250,000 Unamortized debt issuance costs (1,096) (2,069) Net carrying amount (1) $ 248,904 $ 247,931 (1) Net carrying amount as of September 30, 2023 presented within total current liabilities on the condensed consolidated balance sheet. The Company carries the 2024 Notes at face value less unamortized debt issuance costs on the accompanying condensed consolidated balance sheets and presents the fair value for disclosure purposes only. The estimated fair value was determined based on the actual bids and offers of the 2024 Notes in an over-the-counter market on the last trading day of the period. The estimated fair value of the 2024 Notes, based on a market approach at September 30, 2023, was approximately $244.0 million, which represents a Level 2 valuation. During the quarter ended September 30, 2023, the Company recognized $0.3 million of interest expense related to the amortization of debt issuance costs and $0.1 million of coupon interest expense. During the quarter ended September 30, 2022, the Company recognized $0.3 million of interest expense related to the amortization of debt issuance costs and $0.1 million of coupon interest expense. During the nine months ended September 30, 2023, the Company recognized $1.0 million of interest expense related to the amortization of debt issuance costs and $0.2 million of coupon interest expense. During the nine months ended September 30, 2022, the Company recognized $1.0 million of interest expense related to the amortization of debt issuance costs and $0.2 million of coupon interest expense. At September 30, 2023, the remaining life of the 2024 Notes was approximately 10 months. The 2024 Notes were not convertible at September 30, 2023. It is the Company’s current intent to settle conversions of the 2024 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. In connection with the offering of the 2024 Notes, the Company entered into privately negotiated capped call transactions (the "2024 Capped Calls"). There have been no changes to the condition of the 2024 Capped Calls since December 31, 2022, and the 2024 Capped Calls are still outstanding as of September 30, 2023. 2026 Notes The 0.00% Convertible Senior Notes due 2026 (the "2026 Notes") consisted of the following (in thousands): September 30, December 31, Liability: Principal $ 1,150,000 $ 1,150,000 Unamortized debt issuance costs (10,461) (13,625) Net carrying amount $ 1,139,539 $ 1,136,375 The Company carries the 2026 Notes at face value less unamortized debt issuance costs on the accompanying condensed consolidated balance sheets and presents the fair value for disclosure purposes only. The estimated fair value was determined based on the actual bids and offers of the 2026 Notes in an over-the-counter market on the last trading day of the period. The estimated fair value of the 2026 Notes, based on a market approach at September 30, 2023, was approximately $991.9 million, which represents a Level 2 valuation. During the quarter and nine months ended September 30, 2023, the Company recognized $1.1 million and $3.2 million of interest expense related to the amortization of debt issuance costs, respectively. During the quarter and nine months ended September 30, 2022, the Company recognized $1.1 million and $3.2 million of interest expense related to the amortization of debt issuance costs, respectively. At September 30, 2023, the remaining life of the 2026 Notes was approximately 30 months. The 2026 Notes were not convertible at September 30, 2023. It is the Company’s current intent to settle conversions of the 2026 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. In connection with the offering of the 2026 Notes, the Company entered into privately negotiated capped call transactions (the "2026 Capped Calls" and together with the 2024 Capped Calls, the "Capped Calls"). There have been no changes to the condition of the 2026 Notes since December 31, 2022, and the 2026 Capped Calls are still outstanding as of September 30, 2023.

Restructuring Costs

Restructuring Costs	9 Months Ended
	Sep. 30, 2023
Restructuring and Related Activities [Abstract]
Restructuring Costs	Restructuring Costs Fiscal 2023 Restructuring Program On August 23, 2023, the Company announced its intention to reduce its global workforce by approximately 9%, or approximately 166 total positions. The actions were designed to support the Company’s growth, scale and profitability objectives. In connection with the restructuring plan, the Company currently estimates that it will incur expenses of up to $9.0 million, primarily for severance and other termination benefits. The Company expects to recognize these anticipated expenses during the third and fourth quarters of fiscal year 2023 and to have substantially completed the planned actions during the fourth quarter of fiscal year 2023, subject to local law and consultation requirements, which may extend the process in certain countries. During the quarter and nine months ended September 30, 2023, the Company recorded $8.7 million for one-time termination benefits related to the fiscal 2023 restructuring program, which occurred in the United States and various international locations. The charges were recorded pursuant to ASC 420, Exit or Disposal Cost Obligations . Fiscal 2022 Restructuring Program On December 7, 2022, the Company announced its intention to reduce its global workforce by approximately 5%, or approximately 95 total positions. The actions were primarily in response to cost reduction initiatives as the Company continues to focus on key growth priorities. The actions were substantially completed in the fourth quarter of fiscal year 2022 and were subject to local law and consultation requirements, which extends the process in certain countries. During the quarter and nine months ended September 30, 2023, the Company recorded zero and $1.1 million, respectively, for one-time termination benefits related to the fiscal 2022 restructuring program, which occurred in the United States and various international locations. The charges were recorded pursuant to ASC 420. The liability for the fiscal 2023 and 2022 restructuring programs was included in accrued expenses and other current liabilities in the condensed consolidated balance sheet, and the following tables summarize the related activity for the respective plans for the quarter and nine months ended September 30, 2023 (in thousands): Quarter Ended September 30, 2023 Restructuring Program Fiscal 2023 Fiscal 2022 Total Accrual balance as of June, 30, 2023 $ — $ 150 $ 150 Restructuring charges 8,664 — 8,664 Cash payments and adjustments (2,386) (95) (2,481) Accrual balance as of September 30, 2023 $ 6,278 $ 55 $ 6,333 Nine Months Ended September 30, 2023 Restructuring Program Fiscal 2023 Fiscal 2022 Total Accrual balance as of December, 31, 2022 $ — $ 1,737 $ 1,737 Restructuring charges 8,664 1,149 9,813 Cash payments and adjustments (2,386) (2,831) (5,217) Accrual balance as of September 30, 2023 $ 6,278 $ 55 $ 6,333 All plan adjustments were changes in estimates whereby increases and decreases in charges were generally recorded to operating expenses in the period of adjustments.

Equity Awards

Equity Awards	9 Months Ended
	Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]
Equity Awards	Equity Awards Stock-based compensation expense Stock-based compensation expense was as follows (in thousands): Quarter Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Cost of revenues $ 2,695 $ 2,346 $ 7,817 $ 6,309 Sales and marketing 6,123 7,257 18,788 20,619 Research and development 3,750 3,847 11,282 10,554 General and administrative 7,511 7,449 22,578 19,928 $ 20,079 $ 20,899 $ 60,465 $ 57,410 For the quarters ended September 30, 2023 and 2022, stock-based compensation capitalized as an asset was $0.8 million and $0.7 million, respectively. For the nine months ended September 30, 2023 and 2022, stock-based compensation capitalized as an asset was $2.6 million and $1.7 million, respectively. Stock options - service-only vesting conditions The following table summarizes activity for awards that contain service-only vesting conditions (in thousands): Outstanding at December 31, 2022 2,431 Granted — Exercised (532) Forfeited/canceled (129) Outstanding at September 30, 2023 1,770 Restricted stock units - service-only vesting conditions The following table summarizes activity for restricted stock units that contain service-only vesting conditions (in thousands): Nonvested at December 31, 2022 2,202 Granted 1,386 Vested (771) Forfeited/canceled (328) Nonvested at September 30, 2023 2,489 Restricted stock units - performance and service conditions The following table summarizes activity for restricted stock units with performance and service vesting conditions with grant dates established (in thousands): Nonvested at December 31, 2022 69 Granted 163 Performance adjustment (28) Vested (41) Forfeited/canceled (48) Nonvested at September 30, 2023 115 The following table summarizes activity for restricted stock units with performance and service vesting conditions with no grant dates established (in thousands): Nonvested at December 31, 2022 138 Granted 158 Forfeited/canceled (59) Nonvested at September 30, 2023 237 Restricted stock units - performance, market, and service conditions The following table summarizes activity for restricted stock units with performance, market, and service-based conditions (in thousands): Nonvested at December 31, 2022 189 Granted — Vested — Forfeited/canceled (189) Nonvested at September 30, 2023 —

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Income Taxes	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 income (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 income taxes. For the quarters ended September 30, 2023 and 2022, the Company recorded $2.0 million income tax benefit and $0.5 million income tax expense, respectively. The income tax benefit for the quarter ended September 30, 2023 compared to the income tax expense for the quarter ended September 30, 2022, resulted primarily from the current quarter’s partial release of $1.7 million of existing valuation allowance as net deferred tax liabilities acquired from DI are a source of taxable income to support recognition of existing BlackLine UK deferred tax assets, along with changes in the mix of profitable jurisdictions. For the nine months ended September 30, 2023 and 2022, the Company recorded $0.5 million and $12.9 million in income tax benefit, respectively. The $12.4 million difference resulted primarily from the release of $14.2 million of existing valuation allowance recognized during the nine months ended September 30, 2022 in connection with the FourQ acquisition, along with changes in the mix of profitable jurisdictions, partially offset by the current quarter's release of $1.7 million of existing valuation allowance in connection with the DI Acquisition.

Net Income (Loss) per Share

Net Income (Loss) per Share	9 Months Ended
	Sep. 30, 2023
Earnings Per Share [Abstract]
Net Income (Loss) per Share	Net Income (Loss) per Share The following table sets forth the computation of basic and diluted net income (loss) per share (in thousands, except per share amounts): Quarter Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Basic net income (loss) per share Numerator: Net income (loss) attributable to BlackLine, Inc. $ 11,923 $ (20,019) $ 30,764 $ (40,695) Denominator: Weighted average shares 61,101 59,695 60,666 59,422 Basic net income (loss) per share attributable to BlackLine, Inc. $ 0.20 $ (0.34) $ 0.51 $ (0.68) Diluted net income (loss) per share Numerator: Net income (loss) attributable to BlackLine, Inc. $ 11,923 $ (20,019) $ 30,764 $ (40,695) Interest expense 1,475 — 4,372 — Net income (loss) attributable to BlackLine, Inc. for diluted calculation $ 13,398 $ (20,019) $ 35,136 $ (40,695) Denominator: Weighted average shares 61,101 59,695 60,666 59,422 Dilutive effect of securities 677 — 912 — Dilutive effect of convertible senior notes 10,324 — 10,324 — Shares used to calculate diluted net income (loss) per share 72,102 59,695 71,902 59,422 Diluted net income (loss) per share attributable to BlackLine, Inc. $ 0.19 $ (0.34) $ 0.49 $ (0.68) The weighted average impact of potentially dilutive securities that were excluded from the diluted per share calculations because they were anti-dilutive were as follows (in thousands): Quarter Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Stock options - service-only vesting conditions 620 2,510 1,225 2,610 Restricted stock units - service-only vesting conditions 1,915 2,255 2,193 1,962 Restricted stock units - performance and service conditions — 70 21 46 Restricted stock units - performance, market, and service conditions — — 97 — Total shares excluded from net loss per share 2,535 4,835 3,536 4,618 Additionally, approximately 3.4 million and 6.9 million weighted average shares underlying the conversion option in the 2024 Notes and the 2026 Notes, respectively, are excluded from the calculation of diluted net loss per share attributable to common stockholders for the quarter and nine months ended September 30, 2022 as the effect would be anti-dilutive. The shares are subject to adjustment, up to approximately 4.7 million shares and 9.9 million shares for the 2024 Notes and the 2026 Notes, respectively, if certain corporate events occur prior to the maturity dates or if the Company issues a notice of redemption.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies 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, 2023 and December 31, 2022, the Company has not accrued a liability for these indemnification arrangements because the likelihood of incurring a payment obligation, if any, in connection with these indemnification arrangements was not probable or reasonably estimable.

Unearned Revenue and Performanc

Unearned Revenue and Performance Obligations	9 Months Ended
	Sep. 30, 2023
Unearned Revenue And Performance Obligations [Abstract]
Unearned Revenue and Performance Obligations	Unearned Revenue and Performance Obligations Revenue totaling $248.3 million and $217.0 million was recognized during the nine months ended September 30, 2023 and 2022, respectively, that was previously included in the deferred revenue balance at December 31, 2022 and 2021, respectively. Contracted but unrecognized revenue was $767.6 million at September 30, 2023, of which the Company expects to recognize approximately 58% over the next 12 months and the remainder thereafter.

Geographic Information

Geographic Information	9 Months Ended
	Sep. 30, 2023
Segment Reporting [Abstract]
Geographic Information	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, 2023 2022 2023 2022 United States $ 108,757 $ 96,769 $ 312,821 $ 273,934 International 41,951 37,499 121,445 109,047 $ 150,708 $ 134,268 $ 434,266 $ 382,981

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Pay vs Performance Disclosure
Net income (loss) attributable to BlackLine, Inc.	$ 11,923	$ (20,019)	$ 30,764	$ (40,695)

Insider Trading Arrangements

Insider Trading Arrangements - shares	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023	Sep. 14, 2023
Trading Arrangements, by Individual
Material Terms of Trading Arrangement		On September 14, 2023, Mark Woodhams, our Chief Revenue Officer, adopted a "Rule 10b5-1 trading arrangement", as defined in Regulation S-K Item 408. The trading arrangement provides for the sale, from time to time, of an aggregate of up to 25,554 shares of our common stock, and is intended to satisfy the affirmative defense in Rule 10b5-1(c). The number of shares sold under the trading arrangement will be reduced by the number of shares sold to cover applicable withholding taxes. The duration of the trading arrangement is until August 20, 2024 or earlier if all transactions under the trading arrangement have been completed
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Terminated	false
Mark Woodhams [Member]
Trading Arrangements, by Individual
Name	Mark Woodhams
Title	Chief Revenue Officer
Rule 10b5-1 Arrangement Terminated	true
Termination Date	September 14, 2023
Aggregate Available			25,554
Mark Partin [Member]
Trading Arrangements, by Individual
Arrangement Duration	341 days

Basis of Presentation, Signif_2

Basis of Presentation, Significant Accounting Policies and Recently-Issued Accounting Pronouncements (Policies)	9 Months Ended
	Sep. 30, 2023
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. On an ongoing basis, management evaluates its estimates, primarily those related to determining the stand-alone selling price for separate deliverables in the Company’s subscription revenue arrangements, allowance for doubtful accounts, cancellations and credits, fair value of assets and liabilities assumed in a business combination, recoverability of goodwill and long-lived assets, useful lives associated with long-lived assets and right-of-use assets, income taxes, contingencies, fair value of contingent consideration, fair value of the Notes (as defined in "Note 8 - Convertible Senior Notes"), redemption value of redeemable non-controlling interest, and the valuation and assumptions underlying stock-based compensation. These estimates are based on historical data and experience, as well as various other factors that management believes to be reasonable under the circumstances. Actual results could differ from those estimates. The Company assessed certain accounting matters that generally require consideration of forecasted financial information in context with the information reasonably available to the Company at September 30, 2023 and through the date of this report. The accounting matters assessed included, but were not limited to, the Company’s valuation of contingent consideration, the allowance for credit losses, and the carrying value of goodwill and other long-lived assets. While there was not a material impact to the Company’s condensed consolidated financial statements for the quarter and nine months ended September 30, 2023, the Company’s future assessment of these accounting matters and other factors could result in material impacts to the Company’s consolidated financial statements in future reporting periods.
Recently-adopted accounting pronouncements and recently-issued accounting pronouncements	Recently-adopted accounting pronouncements There have been no recently adopted accounting pronouncements since the filing of the Company's Annual Report on Form 10-K for the year ended December 31, 2022. Recently-issued accounting pronouncements The Company has evaluated all recent accounting pronouncements and believes that none of them will have a material effect on the company’s financial statements.

Redeemable Non-Controlling In_2

Redeemable Non-Controlling Interest (Tables)	9 Months Ended
	Sep. 30, 2023
Equity Method Investments and Joint Ventures [Abstract]
Summary of Redeemable Non-Controlling Interest	The following table summarizes the activity in the redeemable non-controlling interest for the periods (in thousands): Quarter Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Balance at beginning of period $ 26,288 $ 23,635 $ 23,895 $ 28,699 Net income (loss) attributable to redeemable non-controlling interest (excluding adjustment to non-controlling interest) 194 (344) 599 (468) Foreign currency translation (31) (71) (132) (409) Adjustment to redeemable non-controlling interest 1,355 1,375 3,444 (3,227) Balance at end of period $ 27,806 $ 24,595 $ 27,806 $ 24,595

Business Combinations (Tables)

Business Combinations (Tables)	9 Months Ended
	Sep. 30, 2023
Business Combination and Asset Acquisition [Abstract]
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	The purchase consideration and major classes of assets and liabilities to which the Company allocated the total fair value of purchase consideration of $11.4 million were as follows (in thousands): Total cash purchase consideration $ 11,394 Cash and cash equivalents $ 27 Accounts receivable, net 916 Prepaid expenses and other current assets 893 Property and equipment, net 132 Intangible assets, net 8,800 Goodwill 5,126 Operating lease right-of-use assets 402 Other assets 58 Accounts payable (665) Accrued expenses and other current liabilities (1,636) Deferred revenue, current (98) Operating lease liabilities (402) Deferred tax liabilities, net (2,159) Total consideration $ 11,394
Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination	The acquired intangible asset categories, fair value, and amortization periods, were as follows: Amortization Period Fair Value (in years) (in thousands) Developed technology 5 $ 8,110 Customer relationships 3 690 $ 8,800

Intangible Assets and Goodwill

Intangible Assets and Goodwill (Tables)	9 Months Ended
	Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Carrying Value of Intangible Assets	The carrying value of intangible assets was as follows (in thousands): September 30, 2023 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Trade name $ 15,977 $ (15,977) $ — Developed technology 137,368 (63,481) 73,887 Customer relationships 26,779 (17,591) 9,188 Defensive patent 2,333 (1,103) 1,230 $ 182,457 $ (98,152) $ 84,305 December 31, 2022 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Trade name $ 15,977 $ (14,913) $ 1,064 Developed technology 129,258 (54,462) 74,796 Customer relationships 26,089 (12,552) 13,537 Defensive patent 2,333 (866) 1,467 $ 173,657 $ (82,793) $ 90,864
Schedule of Changes in Goodwill	The following table represents the changes in goodwill (in thousands): Balance at December 31, 2022 $ 443,861 Additions from acquisitions 5,126 Balance at September 30, 2023 $ 448,987

Balance Sheet Components (Table

Balance Sheet Components (Tables)	9 Months Ended
	Sep. 30, 2023
Balance Sheet Related Disclosures [Abstract]
Schedule of Investments in Marketable Securities	Investments in marketable securities presented within current assets on the condensed consolidated balance sheets consisted of the following (in thousands): September 30, 2023 Amortized Gross Gross Fair Value Marketable securities U.S. treasury securities $ 478,149 $ 10 $ (562) $ 477,597 Commercial paper 276,038 1 — 276,039 U.S. government agencies 172,433 5 (353) 172,085 $ 926,620 $ 16 $ (915) $ 925,721 December 31, 2022 Amortized Gross Gross Fair Value Marketable securities U.S. treasury securities $ 418,941 $ 9 $ (1,047) $ 417,903 Corporate bonds 64,597 3 (296) 64,304 Commercial paper 278,406 — — 278,406 U.S. government agencies 113,512 40 (82) 113,470 $ 875,456 $ 52 $ (1,425) $ 874,083
Fair Values of Available-for-Sale Securities, by Remaining Contractual Maturity	The fair values of available-for-sale securities, by remaining contractual maturity, were as follows (in thousands): September 30, 2023 Amortized Cost Fair Value Maturing within 1 year $ 915,828 $ 915,016 Maturing between 1 and 2 years 10,792 10,705 $ 926,620 $ 925,721
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, Accrued salaries and employee benefits $ 31,888 $ 39,043 Accrued income and other taxes payable 7,446 9,415 Accrued restructuring costs 6,333 1,737 Other accrued expenses and current liabilities 15,685 8,405 $ 61,352 $ 58,600

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2023
Fair Value Disclosures [Abstract]
Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis	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, 2023 Level 1 Level 2 Level 3 Total Cash equivalents Money market funds $ 160,511 $ — $ — $ 160,511 Commercial paper — 20,788 — 20,788 Marketable securities U.S. treasury securities 477,597 — — 477,597 Commercial paper — 276,039 — 276,039 U.S. government agencies — 172,085 — 172,085 Total assets $ 638,108 $ 468,912 $ — $ 1,107,020 Liabilities Contingent consideration $ 8,000 $ — $ — $ 8,000 Total liabilities $ 8,000 $ — $ — $ 8,000 December 31, 2022 Level 1 Level 2 Level 3 Total Cash equivalents Money market funds $ 101,919 $ — $ — $ 101,919 Commercial paper — 59,405 — 59,405 Marketable securities U.S. treasury securities 417,903 — — 417,903 Corporate bonds — 64,301 — 64,301 Commercial paper — 278,406 — 278,406 U.S. government agencies — 113,471 — 113,471 Total assets $ 519,822 $ 515,583 $ — $ 1,035,405 Liabilities Contingent consideration $ 8,000 $ — $ 33,549 $ 41,549 Total liabilities $ 8,000 $ — $ 33,549 $ 41,549
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, 2023 2022 2023 2022 Beginning fair value $ 19,120 $ 60,821 $ 41,549 $ 20,732 Additions in the period — — — 55,947 Change in fair value (11,120) 1,745 (33,549) (14,113) Ending fair value $ 8,000 $ 62,566 $ 8,000 $ 62,566

Convertible Senior Notes (Table

Convertible Senior Notes (Tables)	9 Months Ended
	Sep. 30, 2023
Debt Disclosure [Abstract]
Summary of Notes	The 0.125% Convertible Senior Notes due 2024 (the "2024 Notes") consisted of the following (in thousands): September 30, December 31, Liability: Principal $ 250,000 $ 250,000 Unamortized debt issuance costs (1,096) (2,069) Net carrying amount (1) $ 248,904 $ 247,931 The 0.00% Convertible Senior Notes due 2026 (the "2026 Notes") consisted of the following (in thousands): September 30, December 31, Liability: Principal $ 1,150,000 $ 1,150,000 Unamortized debt issuance costs (10,461) (13,625) Net carrying amount $ 1,139,539 $ 1,136,375

Restructuring Costs (Tables)

Restructuring Costs (Tables)	9 Months Ended
	Sep. 30, 2023
Restructuring and Related Activities [Abstract]
Restructuring Liability	The liability for the fiscal 2023 and 2022 restructuring programs was included in accrued expenses and other current liabilities in the condensed consolidated balance sheet, and the following tables summarize the related activity for the respective plans for the quarter and nine months ended September 30, 2023 (in thousands): Quarter Ended September 30, 2023 Restructuring Program Fiscal 2023 Fiscal 2022 Total Accrual balance as of June, 30, 2023 $ — $ 150 $ 150 Restructuring charges 8,664 — 8,664 Cash payments and adjustments (2,386) (95) (2,481) Accrual balance as of September 30, 2023 $ 6,278 $ 55 $ 6,333 Nine Months Ended September 30, 2023 Restructuring Program Fiscal 2023 Fiscal 2022 Total Accrual balance as of December, 31, 2022 $ — $ 1,737 $ 1,737 Restructuring charges 8,664 1,149 9,813 Cash payments and adjustments (2,386) (2,831) (5,217) Accrual balance as of September 30, 2023 $ 6,278 $ 55 $ 6,333

Equity Awards (Tables)

Equity Awards (Tables)	9 Months Ended
	Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]
Summary of Stock-Based Compensation Expense	Stock-based compensation expense was as follows (in thousands): Quarter Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Cost of revenues $ 2,695 $ 2,346 $ 7,817 $ 6,309 Sales and marketing 6,123 7,257 18,788 20,619 Research and development 3,750 3,847 11,282 10,554 General and administrative 7,511 7,449 22,578 19,928 $ 20,079 $ 20,899 $ 60,465 $ 57,410
Summary of Stock Options Activity	The following table summarizes activity for awards that contain service-only vesting conditions (in thousands): Outstanding at December 31, 2022 2,431 Granted — Exercised (532) Forfeited/canceled (129) Outstanding at September 30, 2023 1,770
Summary of Restricted Stock Units Activity	The following table summarizes activity for restricted stock units that contain service-only vesting conditions (in thousands): Nonvested at December 31, 2022 2,202 Granted 1,386 Vested (771) Forfeited/canceled (328) Nonvested at September 30, 2023 2,489 The following table summarizes activity for restricted stock units with performance and service vesting conditions with grant dates established (in thousands): Nonvested at December 31, 2022 69 Granted 163 Performance adjustment (28) Vested (41) Forfeited/canceled (48) Nonvested at September 30, 2023 115 The following table summarizes activity for restricted stock units with performance and service vesting conditions with no grant dates established (in thousands): Nonvested at December 31, 2022 138 Granted 158 Forfeited/canceled (59) Nonvested at September 30, 2023 237 The following table summarizes activity for restricted stock units with performance, market, and service-based conditions (in thousands): Nonvested at December 31, 2022 189 Granted — Vested — Forfeited/canceled (189) Nonvested at September 30, 2023 —

Net Income (Loss) per Share - (

Net Income (Loss) per Share - (Tables)	9 Months Ended
	Sep. 30, 2023
Earnings Per Share [Abstract]
Schedule of Basic and Diluted Loss per Share	The following table sets forth the computation of basic and diluted net income (loss) per share (in thousands, except per share amounts): Quarter Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Basic net income (loss) per share Numerator: Net income (loss) attributable to BlackLine, Inc. $ 11,923 $ (20,019) $ 30,764 $ (40,695) Denominator: Weighted average shares 61,101 59,695 60,666 59,422 Basic net income (loss) per share attributable to BlackLine, Inc. $ 0.20 $ (0.34) $ 0.51 $ (0.68) Diluted net income (loss) per share Numerator: Net income (loss) attributable to BlackLine, Inc. $ 11,923 $ (20,019) $ 30,764 $ (40,695) Interest expense 1,475 — 4,372 — Net income (loss) attributable to BlackLine, Inc. for diluted calculation $ 13,398 $ (20,019) $ 35,136 $ (40,695) Denominator: Weighted average shares 61,101 59,695 60,666 59,422 Dilutive effect of securities 677 — 912 — Dilutive effect of convertible senior notes 10,324 — 10,324 — Shares used to calculate diluted net income (loss) per share 72,102 59,695 71,902 59,422 Diluted net income (loss) per share attributable to BlackLine, Inc. $ 0.19 $ (0.34) $ 0.49 $ (0.68)
Schedule of Potentially Dilutive Shares Excluded From Calculation of Diluted Net Loss per Share Attributable to Common Stockholders	The weighted average impact of potentially dilutive securities that were excluded from the diluted per share calculations because they were anti-dilutive were as follows (in thousands): Quarter Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Stock options - service-only vesting conditions 620 2,510 1,225 2,610 Restricted stock units - service-only vesting conditions 1,915 2,255 2,193 1,962 Restricted stock units - performance and service conditions — 70 21 46 Restricted stock units - performance, market, and service conditions — — 97 — Total shares excluded from net loss per share 2,535 4,835 3,536 4,618

Geographic Information (Tables)

Geographic Information (Tables)	9 Months Ended
	Sep. 30, 2023
Segment Reporting [Abstract]
Schedule 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, 2023 2022 2023 2022 United States $ 108,757 $ 96,769 $ 312,821 $ 273,934 International 41,951 37,499 121,445 109,047 $ 150,708 $ 134,268 $ 434,266 $ 382,981

The Company (Details)

The Company (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 15, 2023	Dec. 31, 2022
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets	$ 19,937		$ 14,708
Woodland Hills Office Lease
Lessee, Lease, Description [Line Items]
Operating lease extension term		5 years
Operating lease right-of-use assets		$ 7,300
Operating lease, liability		$ 7,300

Redeemable Non-Controlling In_3

Redeemable Non-Controlling Interest - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended
	Nov. 30, 2021	Oct. 31, 2018
Redeemable Noncontrolling Interest [Line Items]
Investment from redeemable non-controlling interest	$ 2.2
BlackLine K.K. | BlackLine K.K.
Redeemable Noncontrolling Interest [Line Items]
Business combination, contribution		$ 4.5
Business combination, outstanding common stock percentage	51%	51%
Business combination, further investment by parent	$ 2.3

Redeemable Non-Controlling In_4

Redeemable Non-Controlling Interest - Summary of Redeemable Non-Controlling Interest (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Redeemable Noncontrolling Interest [Roll Forward]
Balance at beginning of period	$ 26,288	$ 23,635	$ 23,895	$ 28,699
Net income (loss) attributable to redeemable non-controlling interest (excluding adjustment to non-controlling interest)	194	(344)	599	(468)
Foreign currency translation	(31)	(71)	(132)	(409)
Adjustment to redeemable non-controlling interest	1,355	1,375	3,444	(3,227)
Balance at end of period	$ 27,806	$ 24,595	$ 27,806	$ 24,595

Business Combinations - Narrati

Business Combinations - Narrative (Details) - Data Interconnect - USD ($) $ in Thousands		3 Months Ended
	Sep. 12, 2023	Sep. 30, 2023
Business Acquisition [Line Items]
Business combination, payable at closing	$ 11,394
Transaction related costs		$ 1,100
Weighted average useful lives	4 years 9 months 18 days
Fair Value	$ 8,800
Developed technology
Business Acquisition [Line Items]
Fair Value	8,110
Customer relationships
Business Acquisition [Line Items]
Fair Value	$ 690

Business Combinations - Estimat

Business Combinations - Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Sep. 12, 2023	Sep. 30, 2023	Dec. 31, 2022
Business Acquisition [Line Items]
Goodwill		$ 448,987	$ 443,861
Data Interconnect
Business Acquisition [Line Items]
Cash consideration	$ 11,394
Cash and cash equivalents	27
Accounts receivable, net	916
Prepaid expenses and other current assets	893
Property and equipment, net	132
Intangible assets, net	8,800
Goodwill	5,126
Operating lease right-of-use assets	402
Other assets	58
Accounts payable	(665)
Accrued expenses and other current liabilities	(1,636)
Deferred revenue, current	(98)
Operating lease liabilities	(402)
Deferred tax liabilities, net	(2,159)
Total consideration	$ 11,394

Business Combinations - Acquire

Business Combinations - Acquired Intangible Assets (Details) - Data Interconnect $ in Thousands	Sep. 12, 2023 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value	$ 8,800
Developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization Period	5 years
Fair Value	$ 8,110
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization Period	3 years
Fair Value	$ 690

Intangible Assets and Goodwil_2

Intangible Assets and Goodwill - Summary of Carrying Value of Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 182,457	$ 173,657
Accumulated Amortization	(98,152)	(82,793)
Net Carrying Amount	84,305	90,864
Trade name
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	15,977	15,977
Accumulated Amortization	(15,977)	(14,913)
Net Carrying Amount	0	1,064
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	137,368	129,258
Accumulated Amortization	(63,481)	(54,462)
Net Carrying Amount	73,887	74,796
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	26,779	26,089
Accumulated Amortization	(17,591)	(12,552)
Net Carrying Amount	9,188	13,537
Defensive patent
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,333	2,333
Accumulated Amortization	(1,103)	(866)
Net Carrying Amount	$ 1,230	$ 1,467

Intangible Assets and Goodwil_3

Intangible Assets and Goodwill - Changes in Goodwill (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($)
Goodwill [Roll Forward]
Balance beginning	$ 443,861
Additions from acquisitions	5,126
Balance ending	$ 448,987

Balance Sheet Components - Sche

Balance Sheet Components - Schedule of Investments in Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	$ 926,620	$ 875,456
Gross Unrealized Gains	16	52
Gross Unrealized Losses	(915)	(1,425)
Fair Value	925,721	874,083
U.S. treasury securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	478,149	418,941
Gross Unrealized Gains	10	9
Gross Unrealized Losses	(562)	(1,047)
Fair Value	477,597	417,903
Corporate bonds
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost		64,597
Gross Unrealized Gains		3
Gross Unrealized Losses		(296)
Fair Value		64,304
Commercial paper
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	276,038	278,406
Gross Unrealized Gains	1	0
Gross Unrealized Losses	0	0
Fair Value	276,039	278,406
U.S. government agencies
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	172,433	113,512
Gross Unrealized Gains	5	40
Gross Unrealized Losses	(353)	(82)
Fair Value	$ 172,085	$ 113,470

Balance Sheet Components - Fair

Balance Sheet Components - Fair Values of Available-for-Sale Securities, by Remaining Contractual Maturity (Details) $ in Thousands	Sep. 30, 2023 USD ($)
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Maturing within 1 year	$ 915,828
Maturing between 1 and 2 years	10,792
Amortized cost	926,620
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract]
Maturing within 1 year	915,016
Maturing between 1 and 2 years	10,705
Fair Value	$ 925,721

Balance Sheet Components - Addi

Balance Sheet Components - Additional Information (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($) marketableSecurity	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) marketableSecurity	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) marketableSecurity
Balance Sheet Related Disclosures [Abstract]
Net gains and losses on maturities of marketable securities reclassified from accumulated other comprehensive loss to earnings	$ 9,200,000	$ 2,800,000	$ 25,000,000	$ 3,300,000
Net gains (losses) related to securities	0	$ 0	0	$ 0
Securities in continuous loss position, less than 12 months, estimated fair value	555,400,000		555,400,000		$ 521,800,000
Securities in continuous loss position, less than 12 Months, unrealized losses	$ 900,000		$ 900,000		$ 1,400,000
Number of securities in continuous unrealized loss position, greater than 12 months | marketableSecurity	0		0		0
Credit losses on marketable securities	$ 0		$ 0		$ 0
Deferred customer contract acquisition costs	$ 87,600,000		$ 87,600,000		$ 89,100,000

Balance Sheet Components - Sc_2

Balance Sheet Components - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Balance Sheet Related Disclosures [Abstract]
Accrued salaries and employee benefits	$ 31,888	$ 39,043
Accrued income and other taxes payable	7,446	9,415
Accrued restructuring costs	6,333	1,737
Other accrued expenses and current liabilities	15,685	8,405
Accrued expenses and other current liabilities	$ 61,352	$ 58,600

Fair Value Measurements - Summa

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, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	$ 1,107,020	$ 1,035,405
Liabilities
Contingent consideration	8,000	41,549
Total liabilities	8,000	41,549
Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	160,511	101,919
Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	20,788	59,405
Marketable securities	276,039	278,406
U.S. treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	477,597	417,903
Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities		64,301
U.S. government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	172,085	113,471
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	638,108	519,822
Liabilities
Contingent consideration	8,000	8,000
Total liabilities	8,000	8,000
Level 1 | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	160,511	101,919
Level 1 | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Marketable securities	0	0
Level 1 | U.S. treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	477,597	417,903
Level 1 | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities		0
Level 1 | U.S. government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	468,912	515,583
Liabilities
Contingent consideration	0	0
Total liabilities	0	0
Level 2 | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Level 2 | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	20,788	59,405
Marketable securities	276,039	278,406
Level 2 | U.S. treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Level 2 | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities		64,301
Level 2 | U.S. government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	172,085	113,471
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	0	0
Liabilities
Contingent consideration	0	33,549
Total liabilities	0	33,549
Level 3 | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Level 3 | Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Marketable securities	0	0
Level 3 | U.S. treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0	0
Level 3 | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities		0
Level 3 | U.S. government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	$ 0	$ 0

Fair Value Measurements - Sum_2

Fair Value Measurements - Summary of Changes in Contingent Consideration Liability (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Additions in the period	$ 0	$ 0	$ 0	$ 55,947
Contingent Consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning fair value	19,120	60,821	41,549	20,732
Change in fair value	(11,120)	1,745	(33,549)	(14,113)
Ending fair value	$ 8,000	$ 62,566	$ 8,000	$ 62,566

Fair Value Measurements - Narra

Fair Value Measurements - Narrative (Details)	9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)	Jan. 26, 2022 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Change in fair value of contingent consideration	$ (33,549,000)	$ (14,113,000)
Contingent consideration, current	8,000,000		$ 8,000,000
FourQ Systems, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Maximum contingent consideration to be distributed				$ 73,200,000
Change in fair value of contingent consideration	11,100,000
Contingent consideration	0
FourQ Systems, Inc. | Measurement Input, Expected Term
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration, liability, measurement input				3
BlackLine Systems, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration, current	$ 8,000,000

Convertible Senior Notes - Addi

Convertible Senior Notes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Debt Instrument [Line Items]
Interest expense related to amortization of debt issuance costs			$ 4,137	$ 4,119
Convertible Senior Notes due 2024
Debt Instrument [Line Items]
Convertible senior notes interest rate	0.125%		0.125%
Interest expense related to amortization of debt issuance costs	$ 300	$ 300	$ 1,000	1,000
Coupon interest expense	$ 100	100	$ 200	200
Remaining life of notes	10 months		10 months
Convertible Senior Notes due 2024 | Level 2
Debt Instrument [Line Items]
Estimated fair value of convertible senior notes	$ 244,000		$ 244,000
Convertible Senior Notes due 2026
Debt Instrument [Line Items]
Convertible senior notes interest rate	0%		0%
Interest expense related to amortization of debt issuance costs	$ 1,100	$ 1,100	$ 3,200	$ 3,200
Remaining life of notes	30 months		30 months
Convertible Senior Notes due 2026 | Level 2
Debt Instrument [Line Items]
Estimated fair value of convertible senior notes	$ 991,900		$ 991,900

Convertible Senior Notes - Summ

Convertible Senior Notes - Summary of Notes (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Convertible Senior Notes due 2024
Debt Instrument [Line Items]
Principal	$ 250,000	$ 250,000
Unamortized debt issuance costs	(1,096)	(2,069)
Net carrying amount	248,904	247,931
Convertible Senior Notes due 2026
Debt Instrument [Line Items]
Principal	1,150,000	1,150,000
Unamortized debt issuance costs	(10,461)	(13,625)
Net carrying amount	$ 1,139,539	$ 1,136,375

Restructuring Costs - Narrative

Restructuring Costs - Narrative (Details)		3 Months Ended			9 Months Ended
	Aug. 23, 2023 USD ($) position	Sep. 30, 2023 USD ($)	Dec. 31, 2022 position	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 8,664,000		$ 0	$ 9,813,000	$ 0
2023 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Reduction to workforce, percent	9%
Reduction to workforce, number of positions | position	166
Restructuring and related cost, expected	$ 9,000,000
Restructuring charges		8,664,000			8,664,000
2022 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Reduction to workforce, percent			5%
Reduction to workforce, number of positions | position			95
Restructuring charges		0			1,149,000
One-time Termination Benefits | 2023 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges		8,700,000
One-time Termination Benefits | 2022 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 0			$ 1,100,000

Restructuring Costs - Schedule

Restructuring Costs - Schedule of Restructuring Liability (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Restructuring Reserve [Roll Forward]
Balance at beginning of period	$ 150		$ 1,737
Restructuring charges	8,664	$ 0	9,813	$ 0
Cash payments and adjustments	(2,481)		(5,217)
Balance at end of period	6,333		6,333
2023 Restructuring Program
Restructuring Reserve [Roll Forward]
Balance at beginning of period	0		0
Restructuring charges	8,664		8,664
Cash payments and adjustments	(2,386)		(2,386)
Balance at end of period	6,278		6,278
2022 Restructuring Program
Restructuring Reserve [Roll Forward]
Balance at beginning of period	150		1,737
Restructuring charges	0		1,149
Cash payments and adjustments	(95)		(2,831)
Balance at end of period	$ 55		$ 55

Equity Awards - Summary of Stoc

Equity Awards - Summary of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	$ 20,079	$ 20,899	$ 60,465	$ 57,410
Cost of revenues
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	2,695	2,346	7,817	6,309
Sales and marketing
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	6,123	7,257	18,788	20,619
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	3,750	3,847	11,282	10,554
General and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	$ 7,511	$ 7,449	$ 22,578	$ 19,928

Equity Awards - Additional Info

Equity Awards - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Share-Based Payment Arrangement [Abstract]
Stock-based compensation capitalized as an asset	$ 0.8	$ 0.7	$ 2.6	$ 1.7

Equity Awards - Summary of St_2

Equity Awards - Summary of Stock Options Activity (Details) shares in Thousands	9 Months Ended
	Sep. 30, 2023 shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, Beginning balance (in shares)	2,431
Granted (in shares)	0
Exercised (in shares)	(532)
Forfeitures/canceled (in shares)	(129)
Outstanding, Ending balance (in shares)	1,770

Equity Awards - Summary of Rest

Equity Awards - Summary of Restricted Stock Units Activity (Details) shares in Thousands	9 Months Ended
	Sep. 30, 2023 shares
Restricted stock units
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested, Beginning Balance (in shares)	2,202
Granted (in shares)	1,386
Vested (in shares)	(771)
Forfeited/canceled (in shares)	(328)
Nonvested, Ending balance (in shares)	2,489
Restricted stock units - performance and service conditions
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested, Beginning Balance (in shares)	69
Granted (in shares)	163
Performance adjustment (in shares)	(28)
Vested (in shares)	(41)
Forfeited/canceled (in shares)	(48)
Nonvested, Ending balance (in shares)	115
Restricted stock units - performance and service conditions, no grant date
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested, Beginning Balance (in shares)	138
Granted (in shares)	158
Forfeited/canceled (in shares)	(59)
Nonvested, Ending balance (in shares)	237
Restricted stock units, performance, market and service based
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested, Beginning Balance (in shares)	189
Granted (in shares)	0
Vested (in shares)	0
Forfeited/canceled (in shares)	(189)
Nonvested, Ending balance (in shares)	0

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Income tax (benefit) expense	$ 2,005	$ (474)	$ 451	$ 12,852
Change in income tax expense (benefit)			12,400
Decrease in valuation allowance	$ 1,700		$ 1,700	$ 14,200

Net Income (Loss) per Share - S

Net Income (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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Numerator:
Net income (loss) attributable to BlackLine, Inc.	$ 11,923	$ (20,019)	$ 30,764	$ (40,695)
Denominator:
Weighted average shares (in shares)	61,101	59,695	60,666	59,422
Basic net income (loss) per share attributable to BlackLine, Inc. (in usd per share)	$ 0.20	$ (0.34)	$ 0.51	$ (0.68)
Numerator:
Net income (loss) attributable to BlackLine, Inc.	$ 11,923	$ (20,019)	$ 30,764	$ (40,695)
Interest expense	1,475	0	4,372	0
Net income (loss) per share attributable to BlackLine, Inc. (in usd per share)	$ 13,398	$ (20,019)	$ 35,136	$ (40,695)
Denominator:
Weighted average shares (in shares)	61,101	59,695	60,666	59,422
Dilutive effect of securities (in shares)	677	0	912	0
Dilutive effect of convertible senior notes (in shares)	10,324	0	10,324	0
Shares used to calculate diluted net income (loss) per share (in shares)	72,102	59,695	71,902	59,422
Diluted net income (loss) per share attributable to BlackLine, Inc. (in usd per share)	$ 0.19	$ (0.34)	$ 0.49	$ (0.68)

Net Income (Loss) per Share -_2

Net Income (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	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from net loss per share (in shares)	2,535	4,835	3,536	4,618
Stock options - service-only vesting conditions
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from net loss per share (in shares)	620	2,510	1,225	2,610
Restricted stock units - service-only vesting conditions
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from net loss per share (in shares)	1,915	2,255	2,193	1,962
Restricted stock units - performance and service conditions
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from net loss per share (in shares)	0	70	21	46
Restricted stock units - performance, market, and service conditions
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from net loss per share (in shares)	0	0	97	0

Net Income (Loss) per Share - A

Net Income (Loss) per Share - Additional Information (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Anti-dilutive shares excluded from net loss per share (in shares)	2,535	4,835	3,536	4,618
Convertible Senior Notes due 2024
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Anti-dilutive shares excluded from net loss per share (in shares)		3,400		3,400
Convertible Senior Notes due 2026
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Anti-dilutive shares excluded from net loss per share (in shares)		6,900		6,900
Convertible Notes | Convertible Senior Notes due 2024 | Certain Corporate Events Occur Prior to Maturity Date or Company Issues Notice of Redemption
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Anti-dilutive shares excluded from net loss per share (in shares)				4,700
Convertible Notes | Convertible Senior Notes due 2026 | Certain Corporate Events Occur Prior to Maturity Date or Company Issues Notice of Redemption
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Anti-dilutive shares excluded from net loss per share (in shares)				9,900

Unearned Revenue and Performa_2

Unearned Revenue and Performance Obligations - Additional Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Unearned Revenue And Performance Obligations [Abstract]
Deferred revenue recognized	$ 248.3	$ 217
Contracted not recognized revenue	$ 767.6

Unearned Revenue and Performa_3

Unearned Revenue and Performance Obligations - Remaining Performance Obligations (Details) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-10-01	Sep. 30, 2023
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Contracted not recognized revenue, expects to recognize revenue over next 12 months	58%
Remaining performance obligation, expected timing of satisfaction, period	12 months

Geographic Information (Details

Geographic Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Total revenues	$ 150,708	$ 134,268	$ 434,266	$ 382,981
United States
Disaggregation of Revenue [Line Items]
Total revenues	108,757	96,769	312,821	273,934
International
Disaggregation of Revenue [Line Items]
Total revenues	$ 41,951	$ 37,499	$ 121,445	$ 109,047

Uncategorized Items - bl-202309

Label	Element	Value
Accounting Standards Update [Extensible Enumeration]	us-gaap_AccountingStandardsUpdateExtensibleList	Accounting Standards Update 2020-06 [Member]