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CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (PARENTHETICAL) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Amortized cost	$ 913,653	$ 932,850
Allowances for credit losses	$ 4,308	$ 5,064
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)	61,802,503	61,515,105
Common stock, shares, outstanding (in shares)	61,802,503	61,515,105

Fair Value Measurements

3 Months Ended

Mar. 31, 2024

Fair Value Disclosures [Abstract]

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):


	March 31, 2024
	Level 1		Level 2		Level 3		Total
Cash equivalents
U.S. treasury securities	$	9,955	$	—	$	—	$	9,955
Money market funds	237,047		—		—		237,047
Commercial paper	—		19,988		—		19,988

Marketable securities
U.S. treasury securities	512,417		—		—		512,417

Commercial paper	—		291,389		—		291,389
U.S. government agencies	—		109,647		—		109,647

Total assets	$	759,419	$	421,024	$	—	$	1,180,443
Liabilities
Contingent consideration	$	—	$	—	$	—	$	—
Total liabilities	$	—	$	—	$	—	$	—


	December 31, 2023
	Level 1		Level 2		Level 3		Total
Cash equivalents
Money market funds	$	148,298	$	—	$	—	$	148,298
Commercial paper	—		38,926		—		38,926

U.S. government agencies	—		19,987		—		19,987
Marketable securities
U.S. treasury securities	523,974		—		—		523,974

Commercial paper	—		241,429		—		241,429
U.S. government agencies	—		167,952		—		167,952
Total assets	$	672,272	$	468,294	$	—	$	1,140,566
Liabilities
Contingent consideration	$	—	$	—	$	—	$	—
Total liabilities	$	—	$	—	$	—	$	—

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


	Quarter Ended March 31,
	2024		2023
Beginning fair value	$	—	$	41,549
Additions in the period	—		—
Change in fair value	—		3,106
Ending fair value	$	—	$	44,655

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 acquisition of FourQ Systems, Inc. (“FourQ”) 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. At March 31, 2024, the related liability for the FourQ Acquisition was zero.

Increases and decreases in the fair value of contingent consideration are recorded as expense or reversals of expense, respectively, within general and administrative expenses in the unaudited condensed consolidated statements of operations.

- Definition

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

+ References + Details

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
	Mar. 31, 2024	Mar. 31, 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive shares excluded from net loss per share (in shares)	1,597	5,504
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)	189	2,202
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)	1,373	2,869
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)	9	370
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	63
Restricted stock units - 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)	26	0

Net Income (Loss) per Share

3 Months Ended

Mar. 31, 2024

Earnings Per Share [Abstract]

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 March 31,
	2024		2023
Basic net income (loss) per share
Numerator:
Net income (loss) attributable to BlackLine, Inc.	$	10,829	$	(12,008)
Denominator:
Weighted average shares	61,643		60,187
Basic net income (loss) per share attributable to BlackLine, Inc.	$	0.18	$	(0.20)

Diluted net income (loss) per share
Numerator:
Net income (loss) attributable to BlackLine, Inc.	$	10,829	$	(12,008)
Interest expense	1,463		—
Tax effect of interest expense	(69)		—
Net income (loss) attributable to BlackLine, Inc. for diluted calculation	$	12,223	$	(12,008)
Denominator:
Weighted average shares	61,643		60,187
Dilutive effect of securities	926		—
Dilutive effect of convertible senior notes	10,324		—
Shares used to calculate diluted net income (loss) per share	72,893		60,187
Diluted net income (loss) per share attributable to BlackLine, Inc.	$	0.17	$	(0.20)

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 March 31,
	2024	2023
Stock options - service-only vesting conditions	189	2,202

Restricted stock units - service-only vesting conditions	1,373	2,869
Restricted stock units - performance and service conditions	9	370
Restricted stock units - performance, market, and service conditions	—	63
Restricted stock units - market and service conditions	26	—
Total shares excluded from net loss per share	1,597	5,504

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 ended March 31, 2023 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.

Equity Awards - Summary of Restricted Stock Units Activity (Details)	3 Months Ended
	Mar. 31, 2024 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)	2,208,000
Granted (in shares)	1,289,000
Vested (in shares)	(394,000)
Forfeited/canceled (in shares)	(79,000)
Nonvested, Ending balance (in shares)	3,024,000
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)	113,000
Granted (in shares)	183,000
Performance adjustment (in shares)	(62,000)
Vested (in shares)	(51,000)
Forfeited/canceled (in shares)	(8,000)
Nonvested, Ending balance (in shares)	175,000
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)	235,000
Granted (in shares)	100,000
Performance adjustment (in shares)	(133,000)
Vested (in shares)	0
Forfeited/canceled (in shares)	(5,000)
Nonvested, Ending balance (in shares)	197,000
Restricted stock units - market 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)	0
Granted (in shares)	150,000
Vested (in shares)	0
Forfeited/canceled (in shares)	0
Nonvested, Ending balance (in shares)	150,000

Net Income (Loss) per Share - Additional Information (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Anti-dilutive shares excluded from net loss per share (in shares)	1,597	5,504
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
Convertible Senior Notes due 2024 \| Convertible Notes \| 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 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
Convertible Senior Notes due 2026 \| Convertible Notes \| 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

Balance Sheet Components (Tables)

3 Months Ended

Mar. 31, 2024

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):


	March 31, 2024
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Marketable securities
U.S. treasury securities	$	512,472	$	110	$	(165)	$	512,417

Commercial paper	291,389		—		—		291,389
U.S. government agencies	109,792		1		(146)		109,647
	$	913,653	$	111	$	(311)	$	913,453


	December 31, 2023
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Marketable securities
U.S. treasury securities	$	523,344	$	737	$	(107)	$	523,974

Commercial paper	241,428		1		—		241,429
U.S. government agencies	168,078		2		(128)		167,952
	$	932,850	$	740	$	(235)	$	933,355

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):


	March 31, 2024
	Amortized Cost		Fair Value
Maturing within 1 year	$	881,656	$	881,559
Maturing between 1 and 2 years	31,997		31,894
	$	913,653	$	913,453

Schedule of Accrued Expenses and Other Current Liabilities

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


	March 31, 2024		December 31, 2023
Accrued salaries and employee benefits	$	24,610	$	33,344
Accrued income and other taxes payable	6,723		9,408
Accrued restructuring costs	627		1,569
Other accrued expenses and current liabilities	15,173		15,369
	$	47,133	$	59,690

- Definition

Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-9

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-3

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
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-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aa)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
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-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-3

Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-3

Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-3

Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-3

+ Details

Unearned Revenue and Performance Obligations - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Unearned Revenue And Performance Obligations [Abstract]
Deferred revenue recognized	$ 129.6	$ 112.5
Contracted not recognized revenue	$ 825.6

Geographic Information (Tables)

3 Months Ended

Mar. 31, 2024

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 March 31,
	2024		2023
United States	$	111,407	$	100,012
International	46,054		38,972
	$	157,461	$	138,984

Equity Awards (Tables)

3 Months Ended

Mar. 31, 2024

Share-Based Payment Arrangement [Abstract]

Summary of Stock-Based Compensation Expense

Stock-based compensation expense was as follows (in thousands):


	Quarter Ended March 31,
	2024		2023
Cost of revenues	$	1,962	$	2,352
Sales and marketing	5,794		6,483
Research and development	2,851		3,824
General and administrative	7,955		7,779
	$	18,562	$	20,438

Summary of Stock Options Activity

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


Outstanding at December 31, 2023			1,693
Granted			—
Exercised			(36)
Forfeited/canceled			(6)
Outstanding at March 31, 2024			1,651

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, 2023			2,208
Granted			1,289
Vested			(394)
Forfeited/canceled			(79)
Nonvested at March 31, 2024			3,024

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, 2023			113
Granted			183
Performance adjustment			(62)
Vested			(51)
Forfeited/canceled			(8)
Nonvested at March 31, 2024			175

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, 2023			235
Granted			100
Accounting grant dates established			(133)
Vested			—
Forfeited/canceled			(5)
Nonvested at March 31, 2024			197

The following table summarizes activity for restricted stock units with market and service-based conditions (in thousands):


Nonvested at December 31, 2023			—
Granted			150
Vested			—
Forfeited/canceled			—
Nonvested at March 31, 2024			150

Balance Sheet Components - Schedule of Investments in Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	$ 913,653	$ 932,850
Gross Unrealized Gains	111	740
Gross Unrealized Losses	(311)	(235)
Fair Value	913,453	933,355
U.S. treasury securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	512,472	523,344
Gross Unrealized Gains	110	737
Gross Unrealized Losses	(165)	(107)
Fair Value	512,417	523,974
Commercial paper
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	291,389	241,428
Gross Unrealized Gains	0	1
Gross Unrealized Losses	0	0
Fair Value	291,389	241,429
U.S. government agencies
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	109,792	168,078
Gross Unrealized Gains	1	2
Gross Unrealized Losses	(146)	(128)
Fair Value	$ 109,647	$ 167,952

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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-Section 50
-Paragraph 2
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-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-Subparagraph (aaa)
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-3

+ Details

Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2024
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 March 31, 2024 and 2023, the Company recorded $0.9 million and $0.6 million in income tax expense, respectively. The increase in income tax expense for the quarter ended March 31, 2024 compared to March 31, 2023, resulted primarily from an increase in U.S. profitability, along with changes in the mix of profitable foreign jurisdictions. For purposes of calculating its income tax attributed to continuing operations, the Company continued to maintain a full valuation allowance on its U.S. federal and state net deferred tax assets as it was more likely than not that those deferred tax assets will not be realized.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480990/946-20-50-13

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-Paragraph 1
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-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

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+ Details

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenues
Total revenues	$ 157,461	$ 138,984
Cost of revenues
Total cost of revenues	39,097	35,271
Gross profit	118,364	103,713
Operating expenses
Sales and marketing	61,111	61,931
Research and development	25,015	27,105
General and administrative	30,046	28,976
Restructuring costs	444	1,014
Total operating expenses	116,616	119,026
Income (loss) from operations	1,748	(15,313)
Other income (expense)
Interest income	15,360	10,665
Interest expense	(1,469)	(1,455)
Other income, net	13,891	9,210
Income (loss) before income taxes	15,639	(6,103)
Provision for income taxes	869	628
Net income (loss)	14,770	(6,731)
Net income attributable to redeemable non-controlling interest	438	85
Adjustment attributable to redeemable non-controlling interest	3,503	5,192
Net income (loss) attributable to BlackLine, Inc.	$ 10,829	$ (12,008)
Basic net income (loss) per share attributable to BlackLine, Inc. (in usd per share)	$ 0.18	$ (0.20)
Shares used to calculate basic net income (loss) per share (in shares)	61,643	60,187
Diluted net income (loss) per share attributable to BlackLine, Inc. (in usd per share)	$ 0.17	$ (0.20)
Shares used to calculate diluted net income (loss) per share (in shares)	72,893	60,187
Subscription and support
Revenues
Total revenues	$ 149,501	$ 130,426
Cost of revenues
Total cost of revenues	32,052	28,512
Professional services
Revenues
Total revenues	7,960	8,558
Cost of revenues
Total cost of revenues	$ 7,045	$ 6,759

Balance Sheet Components - Fair Values of Available-for-Sale Securities, by Remaining Contractual Maturity (Details) $ in Thousands	Mar. 31, 2024 USD ($)
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost [Abstract]
Maturing within 1 year	$ 881,656
Maturing between 1 and 2 years	31,997
Amortized cost	913,653
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract]
Maturing within 1 year	881,559
Maturing between 1 and 2 years	31,894
Fair Value	$ 913,453

Equity Awards - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Share-Based Payment Arrangement [Abstract]
Stock-based compensation capitalized as an asset	$ 0.9	$ 0.8

Convertible Senior Notes

3 Months Ended

Mar. 31, 2024

Debt Disclosure [Abstract]

Convertible Senior Notes

2024 Notes

As of March 31, 2024, we had $250.0 million aggregate principal amount of our 0.125% Convertible Senior Notes due in 2024 (the “2024 Notes”) outstanding. The 2024 Notes consisted of the following (in thousands):


	March 31, 2024		December 31, 2023
Liability:
Principal	$	250,000	$	250,000

Unamortized debt issuance costs	(440)		(767)
Net carrying amount(1)	$	249,560	$	249,233

(1) Net carrying amount as of March 31, 2024 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 March 31, 2024, was approximately $256.6 million, which represents a Level 2 valuation.

During the quarter ended March 31, 2024, 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 March 31, 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.

The 2024 Notes were not convertible at March 31, 2024. 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, 2023, and the 2024 Capped Calls are still outstanding as of March 31, 2024.

2026 Notes

As of March 31, 2024, we had $1.150 billion aggregate principal amount of our 0.00% Convertible Senior Notes due in 2026 (the “2026 Notes”) outstanding. The 2026 Notes consisted of the following (in thousands):


	March 31, 2024		December 31, 2023
Liability:
Principal	$	1,150,000	$	1,150,000

Unamortized debt issuance costs	(8,334)		(9,392)
Net carrying amount	$	1,141,666	$	1,140,608

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 March 31, 2024, was approximately $1.0 billion, which represents a Level 2 valuation.

During the quarters ended March 31, 2024 and 2023, the Company recognized interest expense related to the amortization of debt issuance costs of $1.1 million and $1.0 million, respectively.

The 2026 Notes were not convertible at March 31, 2024. 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, 2023, and the 2026 Capped Calls are still outstanding as of March 31, 2024.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

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+ Details

Redeemable Non-Controlling Interest - Summary of Redeemable Non-Controlling Interest (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Redeemable Noncontrolling Interest [Roll Forward]
Balance at beginning of period	$ 30,063	$ 23,895
Net income attributable to redeemable non-controlling interest (excluding adjustment to non-controlling interest)	438	85
Foreign currency translation	(104)	(20)
Adjustment to redeemable non-controlling interest	3,503	5,192
Balance at end of period	$ 33,900	$ 29,152

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Beginning Balance (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)		209
Stock option exercises	7,222	$ 2	7,220
Vesting of restricted stock units (in shares)		252
Vesting of restricted stock units	3	$ 3
Acquisition of common stock for tax withholding obligations	(12,403)		(12,403)
Stock-based compensation	21,069		21,069
Other comprehensive loss	1,241			1,241
Net income (loss) attributable to BlackLine, Inc., including adjustment to redeemable non-controlling interest	(12,008)		(5,192)		(6,816)
Ending Balance (in shares) at Mar. 31, 2023		60,478
Ending Balance at Mar. 31, 2023	116,992	$ 605	396,403	(231)	(279,785)
Beginning Balance (in shares) at Dec. 31, 2023		61,515
Beginning Balance at Dec. 31, 2023	260,881	$ 615	474,863	205	(214,802)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock option exercises (in shares)		28
Stock option exercises	311	$ 0	311
Vesting of restricted stock units (in shares)		260
Vesting of restricted stock units	3	$ 3
Acquisition of common stock for tax withholding obligations	(10,981)		(10,981)
Stock-based compensation	19,485		19,485
Other comprehensive loss	(694)			(694)
Net income (loss) attributable to BlackLine, Inc., including adjustment to redeemable non-controlling interest	10,829		(3,503)		14,332
Ending Balance (in shares) at Mar. 31, 2024		61,803
Ending Balance at Mar. 31, 2024	$ 279,834	$ 618	$ 480,175	$ (489)	$ (200,470)

Convertible Senior Notes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Debt Instrument [Line Items]
Interest expense related to amortization of debt issuance costs	$ 1,385	$ 1,362
Convertible Senior Notes due 2024
Debt Instrument [Line Items]
Convertible senior notes, aggregate principal	$ 250,000
Convertible senior notes interest rate	0.125%
Interest expense related to amortization of debt issuance costs	$ 300	300
Coupon interest expense	100	100
Convertible Senior Notes due 2024 \| Level 2
Debt Instrument [Line Items]
Estimated fair value of convertible senior notes	256,600
Convertible Senior Notes due 2026
Debt Instrument [Line Items]
Convertible senior notes, aggregate principal	$ 1,150,000
Convertible senior notes interest rate	0.00%
Interest expense related to amortization of debt issuance costs	$ 1,100	$ 1,000
Convertible Senior Notes due 2026 \| Level 2
Debt Instrument [Line Items]
Estimated fair value of convertible senior notes	$ 1,000,000

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 835
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+ Details

Geographic Information

3 Months Ended

Mar. 31, 2024

Segment Reporting [Abstract]

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 March 31,
	2024		2023
United States	$	111,407	$	100,012
International	46,054		38,972
	$	157,461	$	138,984

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

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-Topic 280
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-Topic 280
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+ Details

Convertible Senior Notes (Tables)

3 Months Ended

Mar. 31, 2024

Debt Disclosure [Abstract]

Summary of Notes

The 2024 Notes consisted of the following (in thousands):


	March 31, 2024		December 31, 2023
Liability:
Principal	$	250,000	$	250,000

Unamortized debt issuance costs	(440)		(767)
Net carrying amount(1)	$	249,560	$	249,233

(1) Net carrying amount as of March 31, 2024 presented within total current liabilities on the condensed consolidated balance sheet.


	March 31, 2024		December 31, 2023
Liability:
Principal	$	1,150,000	$	1,150,000

Unamortized debt issuance costs	(8,334)		(9,392)
Net carrying amount	$	1,141,666	$	1,140,608

Commitments and Contingencies	3 Months Ended
Commitments and Contingencies	Mar. 31, 2024
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 March 31, 2024 and December 31, 2023, 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.

The Company	3 Months Ended
The Company	Mar. 31, 2024
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 critical processes, including financial close, intercompany, invoice-to-cash, and consolidation. 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.” The Company is headquartered in Woodland Hills, California. 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.

Restructuring Costs

3 Months Ended

Mar. 31, 2024

Restructuring and Related Activities [Abstract]

Restructuring Costs

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 ended March 31, 2024 (in thousands):


	Quarter Ended March 31, 2024
	Restructuring Program
	Fiscal 2023		Fiscal 2022		Total
Accrual balance as of December 31, 2023	$	1,562	$	7	$	1,569
Restructuring charges	444		—		444
Cash payments and adjustments	(1,382)		(4)		(1,386)
Accrual balance as of March 31, 2024	$	624	$	3	$	627

All plan adjustments were changes in estimates whereby increases and decreases in charges were generally recorded to operating expenses in the periods of adjustments.

As of March 31, 2024, the Company incurred cumulative costs of $10.3 million and $5.0 million related to the fiscal 2023 restructuring program and fiscal 2022 restructuring program, respectively. The Company does not anticipate incurring material additional expenses.

Pay vs Performance Disclosure - USD ($) $ in Thousands	3 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Pay vs Performance Disclosure
Net income (loss) attributable to BlackLine, Inc.	$ 10,829	$ (12,008)

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
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+ Details

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Income Tax Disclosure [Abstract]
Income tax expense	$ 869	$ 628

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References + Details

Intangible Assets and Goodwill

3 Months Ended

Mar. 31, 2024

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets and Goodwill

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


	March 31, 2024
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Trade name	$	15,977	$	(15,977)	$	—
Developed technology	137,368		(70,284)		67,084
Customer relationships	26,779		(21,075)		5,704
Defensive patent	2,333		(1,261)		1,072
	$	182,457	$	(108,597)	$	73,860


	December 31, 2023
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Trade name	$	15,977	$	(15,977)	$	—
Developed technology	137,368		(66,900)		70,468
Customer relationships	26,779		(19,342)		7,437
Defensive patent	2,333		(1,182)		1,151
	$	182,457	$	(103,401)	$	79,056

The following table represents the changes in goodwill (in thousands):


Balance at December 31, 2023	$	448,965
Additions from acquisitions	—
Balance at March 31, 2024	$	448,965

Fair Value Measurements - Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	$ 1,180,443	$ 1,140,566
Liabilities
Contingent consideration	0	0
Total liabilities	0	0
U.S. treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	9,955
Marketable securities	512,417	523,974
Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	237,047	148,298
Commercial paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	19,988	38,926
Marketable securities	291,389	241,429
U.S. government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		19,987
Marketable securities	109,647	167,952
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	759,419	672,272
Liabilities
Contingent consideration	0	0
Total liabilities	0	0
Level 1 \| U.S. treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	9,955
Marketable securities	512,417	523,974
Level 1 \| Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	237,047	148,298
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. government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		0
Marketable securities	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	421,024	468,294
Liabilities
Contingent consideration	0	0
Total liabilities	0	0
Level 2 \| U.S. treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0
Marketable securities	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	19,988	38,926
Marketable securities	291,389	241,429
Level 2 \| U.S. government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		19,987
Marketable securities	109,647	167,952
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	0	0
Liabilities
Contingent consideration	0	0
Total liabilities	0	0
Level 3 \| U.S. treasury securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0
Marketable securities	0	0
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. government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents		0
Marketable securities	$ 0	$ 0

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
	Mar. 31, 2024	Mar. 31, 2023
Numerator:
Net income (loss) attributable to BlackLine, Inc.	$ 10,829	$ (12,008)
Denominator:
Weighted average shares (in shares)	61,643	60,187
Basic net income (loss) per share attributable to BlackLine, Inc. (in usd per share)	$ 0.18	$ (0.20)
Numerator:
Net income (loss) attributable to BlackLine, Inc.	$ 10,829	$ (12,008)
Interest expense	1,463	0
Tax effect of interest expense	(69)	0
Net income (loss) per share attributable to BlackLine, Inc. (in usd per share)	$ 12,223	$ (12,008)
Denominator:
Weighted average shares (in shares)	61,643	60,187
Dilutive effect of securities (in shares)	926	0
Dilutive effect of convertible senior notes (in shares)	10,324	0
Shares used to calculate diluted net income (loss) per share (in shares)	72,893	60,187
Diluted net income (loss) per share attributable to BlackLine, Inc. (in usd per share)	$ 0.17	$ (0.20)

Intangible Assets and Goodwill - Summary of Carrying Value of Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 182,457	$ 182,457
Accumulated Amortization	(108,597)	(103,401)
Net Carrying Amount	73,860	79,056
Trade name
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	15,977	15,977
Accumulated Amortization	(15,977)	(15,977)
Net Carrying Amount	0	0
Developed technology
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	137,368	137,368
Accumulated Amortization	(70,284)	(66,900)
Net Carrying Amount	67,084	70,468
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	26,779	26,779
Accumulated Amortization	(21,075)	(19,342)
Net Carrying Amount	5,704	7,437
Defensive patent
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,333	2,333
Accumulated Amortization	(1,261)	(1,182)
Net Carrying Amount	$ 1,072	$ 1,151

Fair Value Measurements - Narrative (Details) - FourQ Systems, Inc.	Mar. 31, 2024 USD ($)	Jan. 26, 2022 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Maximum contingent consideration to be distributed		$ 73,200,000
Contingent consideration	$ 0
Measurement Input, Expected Term
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration, liability, measurement input		3

Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2024

Fair Value Disclosures [Abstract]

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


	March 31, 2024
	Level 1		Level 2		Level 3		Total
Cash equivalents
U.S. treasury securities	$	9,955	$	—	$	—	$	9,955
Money market funds	237,047		—		—		237,047
Commercial paper	—		19,988		—		19,988

Marketable securities
U.S. treasury securities	512,417		—		—		512,417

Commercial paper	—		291,389		—		291,389
U.S. government agencies	—		109,647		—		109,647

Total assets	$	759,419	$	421,024	$	—	$	1,180,443
Liabilities
Contingent consideration	$	—	$	—	$	—	$	—
Total liabilities	$	—	$	—	$	—	$	—


	December 31, 2023
	Level 1		Level 2		Level 3		Total
Cash equivalents
Money market funds	$	148,298	$	—	$	—	$	148,298
Commercial paper	—		38,926		—		38,926

U.S. government agencies	—		19,987		—		19,987
Marketable securities
U.S. treasury securities	523,974		—		—		523,974

Commercial paper	—		241,429		—		241,429
U.S. government agencies	—		167,952		—		167,952
Total assets	$	672,272	$	468,294	$	—	$	1,140,566
Liabilities
Contingent consideration	$	—	$	—	$	—	$	—
Total liabilities	$	—	$	—	$	—	$	—

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 March 31,
	2024		2023
Beginning fair value	$	—	$	41,549
Additions in the period	—		—
Change in fair value	—		3,106
Ending fair value	$	—	$	44,655

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Mar. 31, 2024 shares
Trading Arrangements, by Individual
Material Terms of Trading Arrangement	On February 20, 2024, Thomas Unterman, our Lead Independent Director, adopted a “Rule 10b5-1 trading arrangement”, as defined in Regulation S-K Item 408. The trading arrangement provided for the sale, from time to time, of an aggregate of up to 50,000 shares of our common stock, and was intended to satisfy the affirmative defense in Rule 10b5-1(c). On May 1, 2024, Mr. Unterman terminated that 10b5-1 Plan before any trades were executed under it. On March 6, 2024, Mark Partin, our Chief Financial 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 140,956 shares of our common stock, and is intended to satisfy the affirmative defense in Rule 10b5-1(c). The duration of the trading arrangement is until February 28, 2025 or earlier if all transactions under the trading arrangement have been completed. On March 8, 2024, Karole Morgan-Prager, our Chief Legal and Administrative 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 117,260 shares of our common stock, and is intended to satisfy the affirmative defense in Rule 10b5-1(c). The duration of the trading arrangement is until March 10, 2025 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
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
Thomas Unterman [Member]
Trading Arrangements, by Individual
Name	Thomas Unterman
Title	Lead Independent Director
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	February 20, 2024
Rule 10b5-1 Arrangement Terminated	true
Aggregate Available	50,000
Mark Partin [Member]
Trading Arrangements, by Individual
Name	Mark Partin
Title	Chief Financial Officer
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	March 6, 2024
Arrangement Duration	359 days
Aggregate Available	140,956
Karole Morgan-Prager [Member]
Trading Arrangements, by Individual
Name	Karole Morgan-Prager
Title	Chief Legal and Administrative Officer
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	March 8, 2024
Arrangement Duration	367 days
Aggregate Available	117,260

Unearned Revenue and Performance Obligations	3 Months Ended
Unearned Revenue and Performance Obligations	Mar. 31, 2024
Unearned Revenue And Performance Obligations [Abstract]
Unearned Revenue and Performance Obligations	Unearned Revenue and Performance Obligations Revenue totaling $129.6 million and $112.5 million was recognized during the quarter ended March 31, 2024 and 2023, respectively, that was previously included in the deferred revenue balance at December 31, 2023 and 2022, respectively. Contracted but unrecognized revenue was $825.6 million at March 31, 2024, of which the Company expects to recognize approximately 58% over the next 12 months and the remainder thereafter.

Balance Sheet Components

3 Months Ended

Mar. 31, 2024

Balance Sheet Related Disclosures [Abstract]

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):


	March 31, 2024
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Marketable securities
U.S. treasury securities	$	512,472	$	110	$	(165)	$	512,417

Commercial paper	291,389		—		—		291,389
U.S. government agencies	109,792		1		(146)		109,647
	$	913,653	$	111	$	(311)	$	913,453


	December 31, 2023
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Marketable securities
U.S. treasury securities	$	523,344	$	737	$	(107)	$	523,974

Commercial paper	241,428		1		—		241,429
U.S. government agencies	168,078		2		(128)		167,952
	$	932,850	$	740	$	(235)	$	933,355

The Company’s marketable securities as of March 31, 2024 have a contractual maturity of less than two 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):


	March 31, 2024
	Amortized Cost		Fair Value
Maturing within 1 year	$	881,656	$	881,559
Maturing between 1 and 2 years	31,997		31,894
	$	913,653	$	913,453

Refer to “Note 6 - 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 $8.5 million and $7.5 million for the quarters ended March 31, 2024 and 2023, respectively.

Net gains and losses are determined using the specific identification method. During the quarters ended March 31, 2024 and 2023, 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 $365.0 million and $286.6 million, and unrealized losses of $0.3 million and $0.2 million, at March 31, 2024 and December 31, 2023, respectively. There were no marketable securities in a continuous loss position for greater than 12 months at March 31, 2024 and December 31, 2023, 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 March 31, 2024 or December 31, 2023.

Other Assets

Deferred customer contract acquisition costs are included in other assets in the accompanying condensed consolidated balance sheets and totaled $87.0 million and $89.9 million at March 31, 2024 and December 31, 2023, respectively.

Accrued Expenses and Other Current Liabilities

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


	March 31, 2024		December 31, 2023
Accrued salaries and employee benefits	$	24,610	$	33,344
Accrued income and other taxes payable	6,723		9,408
Accrued restructuring costs	627		1,569
Other accrued expenses and current liabilities	15,173		15,369
	$	47,133	$	59,690

Balance Sheet Components - Additional Information (Details)	3 Months Ended
	Mar. 31, 2024 USD ($) marketableSecurity	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($) marketableSecurity
Balance Sheet Related Disclosures [Abstract]
Net gains and losses on maturities of marketable securities reclassified from accumulated other comprehensive loss to earnings	$ 8,500,000	$ 7,500,000
Net gains (losses) related to securities	0	$ 0
Securities in continuous loss position, less than 12 months, estimated fair value	365,000,000		$ 286,600,000
Securities in continuous loss position, less than 12 Months, unrealized losses	$ 300,000		$ 200,000
Number of securities in continuous unrealized loss position, greater than 12 months \| marketableSecurity	0		0
Credit losses on marketable securities	$ 0		$ 0
Deferred customer contract acquisition costs	$ 87,000,000		$ 89,900,000

Net Income (Loss) per Share - (Tables)

3 Months Ended

Mar. 31, 2024

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 March 31,
	2024		2023
Basic net income (loss) per share
Numerator:
Net income (loss) attributable to BlackLine, Inc.	$	10,829	$	(12,008)
Denominator:
Weighted average shares	61,643		60,187
Basic net income (loss) per share attributable to BlackLine, Inc.	$	0.18	$	(0.20)

Diluted net income (loss) per share
Numerator:
Net income (loss) attributable to BlackLine, Inc.	$	10,829	$	(12,008)
Interest expense	1,463		—
Tax effect of interest expense	(69)		—
Net income (loss) attributable to BlackLine, Inc. for diluted calculation	$	12,223	$	(12,008)
Denominator:
Weighted average shares	61,643		60,187
Dilutive effect of securities	926		—
Dilutive effect of convertible senior notes	10,324		—
Shares used to calculate diluted net income (loss) per share	72,893		60,187
Diluted net income (loss) per share attributable to BlackLine, Inc.	$	0.17	$	(0.20)

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 March 31,
	2024	2023
Stock options - service-only vesting conditions	189	2,202

Restricted stock units - service-only vesting conditions	1,373	2,869
Restricted stock units - performance and service conditions	9	370
Restricted stock units - performance, market, and service conditions	—	63
Restricted stock units - market and service conditions	26	—
Total shares excluded from net loss per share	1,597	5,504

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities
Net income (loss) attributable to BlackLine, Inc.	$ 10,829	$ (12,008)
Net income and adjustment attributable to redeemable non-controlling interest (Note 3)	3,941	5,277
Net income (loss)	14,770	(6,731)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	12,648	12,004
Change in fair value of contingent consideration	0	3,106
Amortization of debt issuance costs	1,385	1,362
Stock-based compensation	18,562	20,438
Noncash lease expense	1,558	1,498
Accretion of purchase discounts on marketable securities, net	(8,542)	(7,519)
Net foreign currency losses	38	473
Deferred income taxes	(1,041)	(187)
Provision for credit losses	0	5
Changes in operating assets and liabilities:
Accounts receivable	45,696	30,166
Prepaid expenses and other current assets	(1,964)	(5,268)
Other assets	2,406	467
Accounts payable	(6,792)	(9,518)
Accrued expenses and other current liabilities	(14,774)	(10,653)
Deferred revenue	(11,830)	(1,820)
Operating lease liabilities	(1,710)	(1,654)
Other long-term liabilities	15	(3,302)
Net cash provided by operating activities	50,425	22,867
Cash flows from investing activities
Purchases of marketable securities	(294,961)	(311,246)
Proceeds from maturities of marketable securities	322,700	328,800
Capitalized software development costs	(6,450)	(6,879)
Purchases of property and equipment	(299)	(1,676)
Net cash provided by investing activities	20,990	8,999
Cash flows from financing activities
Principal payments under finance lease obligations	(258)	(241)
Proceeds from exercises of stock options	314	2,411
Acquisition of common stock for tax withholding obligations	(10,981)	(12,403)
Net cash used in financing activities	(10,925)	(10,233)
Effect of foreign currency exchange rate changes on cash, cash equivalents, and restricted cash	(212)	(41)
Net increase in cash, cash equivalents, and restricted cash	60,278	21,592
Cash, cash equivalents, and restricted cash, beginning of period	271,363	201,207
Cash, cash equivalents, and restricted cash, end of period	331,641	222,799
Reconciliation of cash, cash equivalents, and restricted cash to the consolidated balance sheets
Cash and cash equivalents at end of period	331,401	222,557
Restricted cash included within other assets at end of period	240	242
Total cash, cash equivalents, and restricted cash at end of period shown in the consolidated statements of cash flows	331,641	222,799
Non-cash financing and investing activities
Stock-based compensation capitalized for software development	923	832
Capitalized software development costs included in accounts payable and accrued expenses and other current liabilities at end of period	613	710
Purchases of property and equipment included in accounts payable and accrued expenses and other current liabilities at end of period	89	934
Purchases of prepaids and other current assets included in accounts payable at end of period	$ 0	$ 5,933

Redeemable Non-Controlling Interest

3 Months Ended

Mar. 31, 2024

Equity Method Investments and Joint Ventures [Abstract]

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 BlackLine K.K. that is focused on the sale of the Company's products in Japan. The Company initially contributed approximately $4.5 million in cash in exchange for 51% of the outstanding common stock of BlackLine K.K. and subsequently invested a further $2.3 million, maintaining 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.

Activity in the redeemable non-controlling interest was as follows (in thousands):


	Quarter Ended March 31,
	2024		2023
Balance at beginning of period	$	30,063	$	23,895
Net income attributable to redeemable non-controlling interest (excluding adjustment to non-controlling interest)	438		85
Foreign currency translation	(104)		(20)
Adjustment to redeemable non-controlling interest	3,503		5,192
Balance at end of period	$	33,900	$	29,152

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED) (PARENTHETICAL) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net change in unrealized gains (losses) on marketable securities, tax	$ 123	$ 0

Redeemable Non-Controlling Interest (Tables)

3 Months Ended

Mar. 31, 2024

Equity Method Investments and Joint Ventures [Abstract]

Summary of Redeemable Non-Controlling Interest

Activity in the redeemable non-controlling interest was as follows (in thousands):


	Quarter Ended March 31,
	2024		2023
Balance at beginning of period	$	30,063	$	23,895
Net income attributable to redeemable non-controlling interest (excluding adjustment to non-controlling interest)	438		85
Foreign currency translation	(104)		(20)
Adjustment to redeemable non-controlling interest	3,503		5,192
Balance at end of period	$	33,900	$	29,152

Intangible Assets and Goodwill (Tables)

3 Months Ended

Mar. 31, 2024

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Carrying Value of Intangible Assets

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


	March 31, 2024
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Trade name	$	15,977	$	(15,977)	$	—
Developed technology	137,368		(70,284)		67,084
Customer relationships	26,779		(21,075)		5,704
Defensive patent	2,333		(1,261)		1,072
	$	182,457	$	(108,597)	$	73,860


	December 31, 2023
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Trade name	$	15,977	$	(15,977)	$	—
Developed technology	137,368		(66,900)		70,468
Customer relationships	26,779		(19,342)		7,437
Defensive patent	2,333		(1,182)		1,151
	$	182,457	$	(103,401)	$	79,056

Schedule of Changes in Goodwill

The following table represents the changes in goodwill (in thousands):


Balance at December 31, 2023	$	448,965
Additions from acquisitions	—
Balance at March 31, 2024	$	448,965

- Definition

Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 24
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482548/350-20-55-24

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
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-Name Accounting Standards Codification
-Section 50
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-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
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-Name Accounting Standards Codification
-Section 50
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-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
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-Name Accounting Standards Codification
-Section 50
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-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
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-Name Accounting Standards Codification
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-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
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-Name Accounting Standards Codification
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
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-Name Accounting Standards Codification
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-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1A

Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-2

+ Details

Redeemable Non-Controlling Interest - Additional Information (Details) - BlackLine K.K. - BlackLine K.K. - USD ($) $ in Millions	1 Months Ended
	Nov. 30, 2021	Oct. 31, 2018
Redeemable Noncontrolling Interest [Line Items]
Business combination, contribution		$ 4.5
Business combination, outstanding common stock percentage	51.00%	51.00%
Business combination, further investment by parent	$ 2.3

Intangible Assets and Goodwill - Changes in Goodwill (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($)
Goodwill [Roll Forward]
Balance beginning	$ 448,965
Additions from acquisitions	0
Balance ending	$ 448,965

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References + Details

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 14,770	$ (6,731)
Other comprehensive income (loss):
Net change in unrealized gains (losses) on marketable securities, net of tax benefit of $($123) and $0, for the quarters ended March 31, 2024 and 2023, respectively.	(582)	1,266
Foreign currency translation	(216)	(45)
Other comprehensive income (loss)	(798)	1,221
Comprehensive income (loss)	13,972	(5,510)
Less comprehensive income attributable to redeemable non-controlling interest:
Net income attributable to redeemable non-controlling interest	438	85
Foreign currency translation attributable to redeemable non-controlling interest	(104)	(20)
Comprehensive income attributable to redeemable non-controlling interest	334	65
Comprehensive income (loss) attributable to BlackLine, Inc.	$ 13,638	$ (5,575)

Restructuring Costs (Tables)

3 Months Ended

Mar. 31, 2024

Restructuring and Related Activities [Abstract]

Restructuring Liability


	Quarter Ended March 31, 2024
	Restructuring Program
	Fiscal 2023		Fiscal 2022		Total
Accrual balance as of December 31, 2023	$	1,562	$	7	$	1,569
Restructuring charges	444		—		444
Cash payments and adjustments	(1,382)		(4)		(1,386)
Accrual balance as of March 31, 2024	$	624	$	3	$	627

Equity Awards

3 Months Ended

Mar. 31, 2024

Share-Based Payment Arrangement [Abstract]

Equity Awards

Stock-based compensation expense

Stock-based compensation expense was as follows (in thousands):


	Quarter Ended March 31,
	2024		2023
Cost of revenues	$	1,962	$	2,352
Sales and marketing	5,794		6,483
Research and development	2,851		3,824
General and administrative	7,955		7,779
	$	18,562	$	20,438

For the quarters ended March 31, 2024 and 2023, stock-based compensation capitalized as an asset was $0.9 million and $0.8 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, 2023			1,693
Granted			—
Exercised			(36)
Forfeited/canceled			(6)
Outstanding at March 31, 2024			1,651

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, 2023			2,208
Granted			1,289
Vested			(394)
Forfeited/canceled			(79)
Nonvested at March 31, 2024			3,024

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, 2023			113
Granted			183
Performance adjustment			(62)
Vested			(51)
Forfeited/canceled			(8)
Nonvested at March 31, 2024			175

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, 2023			235
Granted			100
Accounting grant dates established			(133)
Vested			—
Forfeited/canceled			(5)
Nonvested at March 31, 2024			197

Restricted stock units - market and service conditions

The following table summarizes activity for restricted stock units with market and service-based conditions (in thousands):


Nonvested at December 31, 2023			—
Granted			150
Vested			—
Forfeited/canceled			—
Nonvested at March 31, 2024			150

Geographic Information (Details) - USD ($) $ in Thousands	3 Months Ended
Geographic Information (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Total revenues	$ 157,461	$ 138,984
United States
Disaggregation of Revenue [Line Items]
Total revenues	111,407	100,012
International
Disaggregation of Revenue [Line Items]
Total revenues	$ 46,054	$ 38,972

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 924
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479941/924-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-5

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 30
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-30

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-42

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-22

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 40
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-40

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-22

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 41
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-41

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-4

+ Details

Unearned Revenue and Performance Obligations - Remaining Performance Obligations (Details) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01	Mar. 31, 2024
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Contracted not recognized revenue, expects to recognize revenue over next 12 months	58.00%
Remaining performance obligation, expected timing of satisfaction, period	12 months

Balance Sheet Components - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Balance Sheet Related Disclosures [Abstract]
Accrued salaries and employee benefits	$ 24,610	$ 33,344
Accrued income and other taxes payable	6,723	9,408
Accrued restructuring costs	627	1,569
Other accrued expenses and current liabilities	15,173	15,369
Accrued expenses and other current liabilities	$ 47,133	$ 59,690

Basis of Presentation, Significant Accounting Policies and Recently-Issued Accounting Pronouncements	3 Months Ended
	Mar. 31, 2024
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, 2023, which was filed with the Securities and Exchange Commission (“SEC”) on February 23, 2024. 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, 2023 was derived from audited financial statements, but does not include all disclosures required by GAAP. The operating results for the quarter ended March 31, 2024 are not necessarily indicative of the results expected for the full year ending December 31, 2024. 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 0.125% Convertible Senior Notes due in 2024 and 0.00% Convertible Senior Notes due in 2026, 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 March 31, 2024 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 ended March 31, 2024, 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, 2023. 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, 2023. Recently-issued accounting pronouncements In November 2023, the FASB issued ASU No. 2023-07, Segment Reporting (Topic 280), Improvements to Reportable Segment Disclosures. This standard expands annual and interim disclosure requirements for reportable segments, primarily through enhanced disclosures about significant segment expenses. For public business entities, it is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. The Company is currently evaluating the impact that the updated standard will have on our disclosures within our consolidated financial statements. The Company does not intend to early adopt. In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740), Improvements to Income Tax Disclosures, which requires that an entity, on an annual basis, disclose additional income tax information, primarily related to the rate reconciliation and income taxes paid. The amendment in the ASU is intended to enhance the transparency and decision usefulness of income tax disclosures. For public business entities, it is effective for annual periods beginning after December 15, 2024. The Company is currently evaluating the impact that the updated standard will have on our disclosures within our consolidated financial statements. The Company does not intend to early adopt.

Basis of Presentation, Significant Accounting Policies and Recently-Issued Accounting Pronouncements (Policies)	3 Months Ended
	Mar. 31, 2024
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 0.125% Convertible Senior Notes due in 2024 and 0.00% Convertible Senior Notes due in 2026, 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 March 31, 2024 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 ended March 31, 2024, 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, 2023. Recently-issued accounting pronouncements In November 2023, the FASB issued ASU No. 2023-07, Segment Reporting (Topic 280), Improvements to Reportable Segment Disclosures. This standard expands annual and interim disclosure requirements for reportable segments, primarily through enhanced disclosures about significant segment expenses. For public business entities, it is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. The Company is currently evaluating the impact that the updated standard will have on our disclosures within our consolidated financial statements. The Company does not intend to early adopt. In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740), Improvements to Income Tax Disclosures, which requires that an entity, on an annual basis, disclose additional income tax information, primarily related to the rate reconciliation and income taxes paid. The amendment in the ASU is intended to enhance the transparency and decision usefulness of income tax disclosures. For public business entities, it is effective for annual periods beginning after December 15, 2024. The Company is currently evaluating the impact that the updated standard will have on our disclosures within our consolidated financial statements. The Company does not intend to early adopt.

Cover - shares	3 Months Ended
Cover - shares	Mar. 31, 2024	May 02, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2024
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		61,817,410
Amendment Flag	false
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Entity Central Index Key	0001666134
Current Fiscal Year End Date	--12-31

Restructuring Costs - Schedule of Restructuring Liability (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Restructuring Reserve [Roll Forward]
Balance at beginning of period	$ 1,569
Restructuring charges	444	$ 1,014
Cash payments and adjustments	(1,386)
Balance at end of period	627
2023 Restructuring Program
Restructuring Reserve [Roll Forward]
Balance at beginning of period	1,562
Restructuring charges	444
Cash payments and adjustments	(1,382)
Balance at end of period	624
2022 Restructuring Program
Restructuring Reserve [Roll Forward]
Balance at beginning of period	7
Restructuring charges	0
Cash payments and adjustments	(4)
Balance at end of period	$ 3

Restructuring Costs - Narrative (Details) $ in Millions	Mar. 31, 2024 USD ($)
2023 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Cumulative restructuring cost incurred	$ 10.3
2022 Restructuring Program
Restructuring Cost and Reserve [Line Items]
Cumulative restructuring cost incurred	$ 5.0

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details

Equity Awards - Summary of Stock Options Activity (Details) shares in Thousands	3 Months Ended
	Mar. 31, 2024 shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, Beginning balance (in shares)	1,693
Granted (in shares)	0
Exercised (in shares)	(36)
Forfeitures/canceled (in shares)	(6)
Outstanding, Ending balance (in shares)	1,651

Convertible Senior Notes - Summary of Notes (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Convertible Senior Notes due 2024
Debt Instrument [Line Items]
Principal	$ 250,000	$ 250,000
Unamortized debt issuance costs	(440)	(767)
Net carrying amount	249,560	249,233
Convertible Senior Notes due 2026
Debt Instrument [Line Items]
Principal	1,150,000	1,150,000
Unamortized debt issuance costs	(8,334)	(9,392)
Net carrying amount	$ 1,141,666	$ 1,140,608

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

+ References + Details

Fair Value Measurements - Summary of Changes in Contingent Consideration Liability (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Additions in the period	$ 0	$ 0
Contingent Consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning fair value	0	41,549
Change in fair value	0	3,106
Ending fair value	$ 0	$ 44,655

Basis of Presentation, Significant Accounting Policies and Recently-Issued Accounting Pronouncements Use of Estimates (Details)	Mar. 31, 2024
Convertible Senior Notes due 2024
Debt Instrument [Line Items]
Convertible senior notes interest rate	0.125%
Convertible Senior Notes due 2026
Debt Instrument [Line Items]
Convertible senior notes interest rate	0.00%

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

+ Details

Equity Awards - Summary of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	$ 18,562	$ 20,438
Cost of revenues
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	1,962	2,352
Sales and marketing
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	5,794	6,483
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	2,851	3,824
General and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense	$ 7,955	$ 7,779

CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 331,401	$ 271,117
Marketable securities (amortized cost of $913,653 and $932,850 at March 31, 2024 and December 31, 2023, respectively)	913,453	933,355
Accounts receivable, net of allowances of $4,308 and $5,064 at March 31, 2024 and December 31, 2023, respectively	125,613	171,608
Prepaid expenses and other current assets	33,189	31,244
Total current assets	1,403,656	1,407,324
Capitalized software development costs, net	38,982	37,828
Property and equipment, net	13,065	14,867
Intangible assets, net	73,860	79,056
Goodwill	448,965	448,965
Operating lease right-of-use assets	19,196	19,173
Other assets	91,161	93,552
Total assets	2,088,885	2,100,765
Current liabilities:
Accounts payable	1,556	8,623
Accrued expenses and other current liabilities	47,133	59,690
Deferred revenue, current	306,855	320,133
Finance lease liabilities, current	525	778
Operating lease liabilities, current	4,233	4,108
Convertible senior notes, net, current	249,560	249,233
Total current liabilities	609,862	642,565
Finance lease liabilities, noncurrent	0	4
Operating lease liabilities, noncurrent	15,360	15,738
Convertible senior notes, net, noncurrent	1,141,666	1,140,608
Deferred tax liabilities, net	5,251	6,394
Deferred revenue, noncurrent	2,352	904
Other long-term liabilities	660	3,608
Total liabilities	1,775,151	1,809,821
Commitments and contingencies (Note 12)
Redeemable non-controlling interest (Note 3)	33,900	30,063
Stockholders' equity:
Common stock, $0.01 par value, 500,000,000 shares authorized, 61,802,503 and 61,515,105 issued and outstanding at March 31, 2024 and December 31, 2023, respectively	618	615
Additional paid-in capital	480,175	474,863
Accumulated other comprehensive income (loss)	(489)	205
Accumulated deficit	(200,470)	(214,802)
Total stockholders' equity	279,834	260,881
Total liabilities, redeemable non-controlling interest, and stockholders' equity	$ 2,088,885	$ 2,100,765