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Net Loss Per Share - Schedule of Basic and Diluted Net Loss Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Earnings Per Share [Abstract]    
Net loss from continuing operations attributable to System1, Inc., basic (in dollars per share) $ (1.07) $ (0.94)
Net loss from continuing operations attributable to System1, Inc., diluted (in dollars per share) (1.07) (0.94)
Net loss from discontinued operations, net of tax attributable to System1, Inc., basic (in dollars per share) 0 (1.54)
Net loss from discontinued operations, net of tax attributable to System1, Inc., diluted (in dollars per share) 0 (1.54)
Basic net loss per share (in dollars per share) (1.07) (2.48)
Diluted net loss per share (in dollars per share) $ (1.07) $ (2.48)
Numerator:    
Net loss from continuing operations attributable to System1, Inc. $ (74,673) $ (85,727)
Net loss from discontinued operations, net of tax attributable to System1, Inc. 0 (141,494)
Net loss attributable to System1, Inc. $ (74,673) $ (227,221)
Denominator:    
Weighted-average common shares outstanding used in computing basic net loss per share (in shares) 69,554 91,454
Weighted-average common shares outstanding used in computing diluted net loss per share (in shares) 69,554 91,454