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Summary of Significant Accounting Policies - Schedule of Consolidated Statements of Comprehensive Loss (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Net loss $ (30,639) $ (34,845) $ (13,791) $ (163,137) $ (42,991) $ (42,926) $ (79,275) $ (249,053)
Foreign currency translation loss (44)     (188)     (275) (110)
Comprehensive loss (30,683)     (163,325)     (79,550) (249,163)
Comprehensive loss attributable to non-controlling interest (7,114)     (31,685)     (18,957) (49,465)
Comprehensive loss attributable to System1, Inc. $ (23,569)     (131,640)     $ (60,593) (199,698)
As Previously Reported                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Net loss       (163,327) (44,177) (43,126)   (250,629)
Foreign currency translation loss       (188)       (109)
Comprehensive loss       (163,515)       (250,738)
Comprehensive loss attributable to non-controlling interest       (31,932)       (50,019)
Comprehensive loss attributable to System1, Inc.       (131,583)       (200,719)
Revision Adjustment                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Net loss       190 $ 1,186 $ 200   1,576
Foreign currency translation loss       0       (1)
Comprehensive loss       190       1,575
Comprehensive loss attributable to non-controlling interest       247       554
Comprehensive loss attributable to System1, Inc.       $ (57)       $ 1,021