v3.24.0.1
Summary of Significant Accounting Policies - Schedule of Consolidated Statements of Operations (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 1 Months Ended 3 Months Ended 11 Months Ended 12 Months Ended
Jan. 26, 2022
Dec. 31, 2022
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2023
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Salaries and benefits $ 31,181     $ 138,045 $ 106,505
Impairment of goodwill 0 $ 26,600 $ 346,100 372,728 0
Total operating expenses 89,353     1,069,912 487,960
Operating loss (36,641)     (457,683) (85,989)
Total other expense 1,049     35,360 45,640
Loss before income tax (37,690)     (493,043) (131,629)
Income tax benefit (629)     (108,680) (20,371)
Net loss from continuing operations (37,061)     (384,363) (111,258)
Net loss from discontinued operations, net of tax 0     (56,959) (174,327)
Net loss (37,061)     (441,322) (285,585)
Less: Net loss from continuing operations attributable to non-controlling interest 0     (99,841) (25,531)
Less: Net loss from discontinued operations attributable to non-controlling interest 0     (11,089) (32,833)
Net loss attributable to System1, Inc. (37,061)     (330,392) (227,221)
Net loss from continuing operations (37,061)     (284,522) (85,727)
Net loss from discontinued operations $ 0     $ (45,870) $ (141,494)
Basic net loss per share, continuing operations (in dollars per share)       $ (3.19) $ (0.94)
Diluted net loss per share, continuing operations (in dollars per share)       (3.19) (0.94)
Basic net loss per share, discontinuing operations (in dollars per share)       (0.51) (1.54)
Diluted net loss per share, discontinuing operations (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)
Weighted average number of shares outstanding - basic (in shares)       89,310 91,454
Weighted average number of shares outstanding - diluted (in shares)       89,310 91,454
As Previously Reported          
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Salaries and benefits       $ 194,976  
Impairment of goodwill       366,309  
Total operating expenses       1,282,194  
Operating loss       (508,254)  
Total other expense       35,801  
Loss before income tax       (544,055)  
Income tax benefit       (101,976)  
Net loss from continuing operations       (442,079)  
Net loss from discontinued operations, net of tax       0  
Net loss       (442,079)  
Less: Net loss from continuing operations attributable to non-controlling interest       (105,682)  
Less: Net loss from discontinued operations attributable to non-controlling interest       0  
Net loss attributable to System1, Inc.       (336,397)  
Net loss from continuing operations       (336,397)  
Net loss from discontinued operations       $ 0  
Basic net loss per share, continuing operations (in dollars per share)       $ (3.77)  
Diluted net loss per share, continuing operations (in dollars per share)       (3.77)  
Basic net loss per share, discontinuing operations (in dollars per share)       0  
Diluted net loss per share, discontinuing operations (in dollars per share)       0  
Basic net loss per share (in dollars per share)       (3.77)  
Diluted net loss per share (in dollars per share)       $ (3.77)  
Weighted average number of shares outstanding - basic (in shares)       89,251  
Weighted average number of shares outstanding - diluted (in shares)       89,251  
Revision Adjustments          
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Salaries and benefits       $ 3,074  
Impairment of goodwill       6,419  
Total operating expenses       9,493  
Operating loss       (9,493)  
Total other expense       0  
Loss before income tax       (9,493)  
Income tax benefit       (10,250)  
Net loss from continuing operations       757  
Net loss from discontinued operations, net of tax       0  
Net loss       757  
Less: Net loss from continuing operations attributable to non-controlling interest       (5,248)  
Less: Net loss from discontinued operations attributable to non-controlling interest       0  
Net loss attributable to System1, Inc.       6,005  
Net loss from continuing operations       6,005  
Net loss from discontinued operations        
Basic net loss per share, continuing operations (in dollars per share)       $ 0.07  
Diluted net loss per share, continuing operations (in dollars per share)       0.07  
Basic net loss per share, discontinuing operations (in dollars per share)       0  
Diluted net loss per share, discontinuing operations (in dollars per share)       0  
Basic net loss per share (in dollars per share)       0.07  
Diluted net loss per share (in dollars per share)       $ 0.07  
Weighted average number of shares outstanding - basic (in shares)       59  
Weighted average number of shares outstanding - diluted (in shares)       59  
As Revised          
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Salaries and benefits       $ 198,050  
Impairment of goodwill       372,728  
Total operating expenses       1,291,687  
Operating loss       (517,747)  
Total other expense       35,801  
Loss before income tax       (553,548)  
Income tax benefit       (112,226)  
Net loss from continuing operations       (441,322)  
Net loss from discontinued operations, net of tax       0  
Net loss       (441,322)  
Less: Net loss from continuing operations attributable to non-controlling interest       (110,930)  
Less: Net loss from discontinued operations attributable to non-controlling interest       0  
Net loss attributable to System1, Inc.       (330,392)  
Net loss from continuing operations       (330,392)  
Net loss from discontinued operations       $ 0  
Basic net loss per share, continuing operations (in dollars per share)       $ (3.70)  
Diluted net loss per share, continuing operations (in dollars per share)       (3.70)  
Basic net loss per share, discontinuing operations (in dollars per share)       0  
Diluted net loss per share, discontinuing operations (in dollars per share)       0  
Basic net loss per share (in dollars per share)       (3.70)  
Diluted net loss per share (in dollars per share)       $ (3.70)  
Weighted average number of shares outstanding - basic (in shares)       89,310  
Weighted average number of shares outstanding - diluted (in shares)       89,310  
Impact of Reclassification of Discontinued Operations          
Error Corrections and Prior Period Adjustments Restatement [Line Items]          
Salaries and benefits       $ (60,005)  
Impairment of goodwill       0  
Total operating expenses       (221,775)  
Operating loss       60,064  
Total other expense       (441)  
Loss before income tax       60,505  
Income tax benefit       3,546  
Net loss from continuing operations       56,959  
Net loss from discontinued operations, net of tax       (56,959)  
Net loss       0  
Less: Net loss from continuing operations attributable to non-controlling interest       11,089  
Less: Net loss from discontinued operations attributable to non-controlling interest       (11,089)  
Net loss attributable to System1, Inc.       0  
Net loss from continuing operations       45,870  
Net loss from discontinued operations       $ (45,870)  
Basic net loss per share, continuing operations (in dollars per share)       $ (0.51)  
Diluted net loss per share, continuing operations (in dollars per share)       (0.51)  
Basic net loss per share, discontinuing operations (in dollars per share)       (0.51)  
Diluted net loss per share, discontinuing operations (in dollars per share)       (0.51)  
Basic net loss per share (in dollars per share)       0  
Diluted net loss per share (in dollars per share)       $ 0