CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Revenues
Total revenues	$ 172,025	$ 160,506	$ 338,956	$ 317,967
Cost of revenues
Total cost of revenues	42,622	40,348	83,546	79,445
Gross profit	129,403	120,158	255,410	238,522
Operating expenses
Sales and marketing	64,712	60,248	127,775	121,359
Research and development	27,964	25,721	53,689	50,736
General and administrative	28,138	31,053	56,483	61,099
Restructuring costs	1,044	928	6,343	1,372
Total operating expenses	121,858	117,950	244,290	234,566
Income from operations	7,545	2,208	11,120	3,956
Other income (expense)
Interest income	8,555	14,065	17,447	29,425
Interest expense	(2,533)	(2,089)	(5,055)	(3,558)
Gain on extinguishment of convertible senior notes	0	65,112	0	65,112
Other income, net	6,022	77,088	12,392	90,979
Income before income taxes	13,567	79,296	23,512	94,935
Provision for income taxes	6,176	4,337	10,847	5,206
Net income	7,391	74,959	12,665	89,729
Net income attributable to redeemable non-controlling interest	660	524	1,057	962
Adjustment attributable to redeemable non-controlling interest	(1,561)	(2,255)	(2,739)	1,248
Net income attributable to BlackLine, Inc.	$ 8,292	$ 76,690	$ 14,347	$ 87,519
Basic net income per share attributable to BlackLine, Inc. (in usd per share)	$ 0.13	$ 1.24	$ 0.23	$ 1.42
Shares used to calculate basic net income per share (in shares)	62,143	61,979	62,481	61,811
Diluted net income per share attributable to BlackLine, Inc. (in usd per share)	$ 0.13	$ 0.22	$ 0.23	$ 0.39
Shares used to calculate diluted net income per share (in shares)	64,004	72,522	64,420	72,708
Subscription and support
Revenues
Total revenues	$ 163,027	$ 151,787	$ 321,489	$ 301,288
Cost of revenues
Total cost of revenues	35,189	33,756	69,319	65,808
Professional services
Revenues
Total revenues	8,998	8,719	17,467	16,679
Cost of revenues
Total cost of revenues	$ 7,433	$ 6,592	$ 14,227	$ 13,637