v3.24.0.1
Net Loss Per Share or Unit - Basic And Diluted Net Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
1 Months Ended 11 Months Ended 12 Months Ended
Jan. 26, 2022
Dec. 31, 2022
Dec. 31, 2023
Earnings Per Share [Abstract]      
Net loss from continuing operations attributable to System1, Inc., Basic (in dollars per share)   $ (3.19) $ (0.94)
Net loss from continuing operations attributable to System1, Inc., Diluted (in dollars per share)   (3.19) (0.94)
Net loss from discontinued operations, net of tax attributable to System1, Inc., Basic (in dollars per share)   (0.51) (1.54)
Net loss from discontinued operations, net of tax attributable to System1, Inc., Diluted (in dollars per share)   (0.51) (1.54)
Basic net loss per share (in dollars per share)   (3.70) (2.48)
Diluted net loss per share (in dollars per share)   $ (3.70) $ (2.48)
Numerator:      
Net loss from continuing operations attributable to System1, Inc. $ (37,061) $ (284,522) $ (85,727)
Net loss from discontinued operations, net of tax attributable to System1, Inc. 0 (45,870) (141,494)
Net loss attributable to System1, Inc. $ (37,061) $ (330,392) $ (227,221)
Denominator:      
Weighted-average common shares outstanding used in computing basic net loss per share (in shares)   89,310 91,454
Weighted-average common shares outstanding used in computing diluted net loss per share (in shares)   89,310 91,454
Basic net loss per unit (in dollars per share) $ (1.81)    
Diluted net loss per unit (in dollars per share) $ (1.81)    
Weighted-average membership units outstanding - basic (in shares) 20,488    
Weighted-average membership units outstanding - diluted (in shares) 20,488