v3.26.1
Net Income per Share - Schedule of Basic and Diluted Income (Loss) per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Numerator:        
Net income attributable to BlackLine, Inc. $ 16,481 $ 8,292 $ 24,607 $ 14,347
Denominator:        
Weighted average shares (in shares) 58,529 62,143 58,981 62,481
Basic net income per share attributable to BlackLine, Inc. (in usd per share) $ 0.28 $ 0.13 $ 0.42 $ 0.23
Numerator:        
Net income attributable to BlackLine, Inc. $ 16,481 $ 8,292 $ 24,607 $ 14,347
Interest expense, net of taxes 1,710 130 2,751 255
Net income attributable to BlackLine, Inc. for diluted calculation (in usd per share) $ 18,191 $ 8,422 $ 27,358 $ 14,602
Denominator:        
Weighted average shares (in shares) 58,529 62,143 58,981 62,481
Dilutive effect of securities (in shares) 171 476 353 554
Dilutive effect of convertible senior notes (in shares) 9,858 1,385 9,858 1,385
Shares used to calculate diluted net income per share (in shares) 68,558 64,004 69,192 64,420
Diluted net income per share attributable to BlackLine, Inc. (in usd per share) $ 0.27 $ 0.13 $ 0.40 $ 0.23