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Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Statement of Comprehensive Income [Abstract]
Net loss	$ (97,298)	$ (285,585)
Other comprehensive (loss) income
Foreign currency translation (loss) income	(500)	35
Comprehensive loss	(97,798)	(285,550)
Comprehensive loss attributable to non-controlling interest	(22,863)	(58,364)
Comprehensive loss attributable to System1, Inc.	$ (74,935)	$ (227,186)

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