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Summary of Significant Accounting Policies - Schedule of Consolidated Balance Sheet (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | --- | --- | ---
Current liabilities: |  |  |  |  |  |  |  |
Deferred tax liability | $ 6,726 |  |  | $ 8,307 |  |  |  |
Total liabilities | 376,467 |  |  | 436,155 |  |  |  |
Stockholders’ Equity / Members’ Deficit |  |  |  |  |  |  |  |
Additional paid-in capital | 858,740 |  |  | 843,112 |  |  |  |
Accumulated deficit | (768,174) |  |  | (707,662) |  |  |  |
Accumulated other comprehensive loss | (262) |  |  | (181) |  |  |  |
Total stockholders' equity attributable to System1, Inc. | 90,313 |  |  | 135,278 |  |  |  |
Non-controlling interest | 12,533 |  |  | 34,037 |  |  |  |
Total stockholders' equity | 102,846 | $ 129,279 | $ 160,405 | 169,315 | $ 240,140 | $ 396,411 | $ 433,959 | $ 470,671
Total liabilities and stockholders' equity | $ 479,313 |  |  | $ 605,470 |  |  |  |
As Previously Reported |  |  |  |  |  |  |  |
Current liabilities: |  |  |  |  |  |  |  |
Deferred tax liability |  |  |  |  | 15,009 |  |  |
Total liabilities |  |  |  |  | 687,066 |  |  |
Stockholders’ Equity / Members’ Deficit |  |  |  |  |  |  |  |
Additional paid-in capital |  |  |  |  | 849,398 |  |  |
Accumulated deficit |  |  |  |  | (646,242) |  |  |
Accumulated other comprehensive loss |  |  |  |  | (435) |  |  |
Total stockholders' equity attributable to System1, Inc. |  |  |  |  | 202,732 |  |  |
Non-controlling interest |  |  |  |  | 37,746 |  |  |
Total stockholders' equity |  |  |  |  | 240,478 |  |  |
Total liabilities and stockholders' equity |  |  |  |  | 927,544 |  |  |
Revision Adjustment |  |  |  |  |  |  |  |
Current liabilities: |  |  |  |  |  |  |  |
Deferred tax liability |  |  |  |  | 338 |  |  |
Total liabilities |  |  |  |  | 338 |  |  |
Stockholders’ Equity / Members’ Deficit |  |  |  |  |  |  |  |
Additional paid-in capital |  |  |  |  | 867 |  |  |
Accumulated deficit |  |  |  |  | 7,027 |  |  |
Accumulated other comprehensive loss |  |  |  |  | 156 |  |  |
Total stockholders' equity attributable to System1, Inc. |  |  |  |  | 8,050 |  |  |
Non-controlling interest |  |  |  |  | (8,388) |  |  |
Total stockholders' equity |  |  |  |  | (338) |  |  |
Total liabilities and stockholders' equity |  |  |  |  | 0 |  |  |
As Currently Reported |  |  |  |  |  |  |  |
Current liabilities: |  |  |  |  |  |  |  |
Deferred tax liability |  |  |  |  | 15,347 |  |  |
Total liabilities |  |  |  |  | 687,404 |  |  |
Stockholders’ Equity / Members’ Deficit |  |  |  |  |  |  |  |
Additional paid-in capital |  |  |  |  | 850,265 |  |  |
Accumulated deficit |  |  |  |  | (639,215) |  |  |
Accumulated other comprehensive loss |  |  |  |  | (279) |  |  |
Total stockholders' equity attributable to System1, Inc. |  |  |  |  | 210,782 |  |  |
Non-controlling interest |  |  |  |  | 29,358 |  |  |
Total stockholders' equity |  |  |  |  | 240,140 |  |  |
Total liabilities and stockholders' equity |  |  |  |  | $ 927,544 |  |  |

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