v3.24.0.1
Summary of Significant Accounting Policies - Schedule of Consolidated Statements of Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 1 Months Ended 11 Months Ended 12 Months Ended
Jan. 26, 2022
Dec. 31, 2022
Dec. 31, 2023
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Net loss $ (37,061) $ (441,322) $ (285,585)
Foreign currency translation income (loss) 87 (394) 35
Comprehensive loss (36,974) (441,716) (285,550)
Comprehensive loss attributable to non-controlling interest 0 (110,930) (58,364)
Comprehensive loss attributable to System1, Inc. $ (36,974) (330,786) $ (227,186)
As Previously Reported      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Net loss   (442,079)  
Foreign currency translation income (loss)   (394)  
Comprehensive loss   (442,473)  
Comprehensive loss attributable to non-controlling interest   (105,682)  
Comprehensive loss attributable to System1, Inc.   (336,791)  
Revision Adjustments      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Net loss   757  
Foreign currency translation income (loss)   0  
Comprehensive loss   757  
Comprehensive loss attributable to non-controlling interest   (5,248)  
Comprehensive loss attributable to System1, Inc.   6,005  
As Revised      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Net loss   (441,322)  
Foreign currency translation income (loss)   (394)  
Comprehensive loss   (441,716)  
Comprehensive loss attributable to non-controlling interest   (110,930)  
Comprehensive loss attributable to System1, Inc.   (330,786)  
Impact of Reclassification of Discontinued Operations      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Net loss   $ 0