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Document and Entity Information
Feb. 15, 2022
Document And Entity Information [Line Items]  
Amendment Flag false
Entity Central Index Key 0001805833
Document Type 8-K
Document Period End Date Feb. 15, 2022
Entity Registrant Name System1, Inc.
Entity Incorporation State Country Code DE
Entity File Number 001-39331
Entity Tax Identification Number 98-1531250
Entity Address, Address Line One 4235 Redwood Avenue
Entity Address, City or Town Marina Del Rey
Entity Address, State or Province CA
Entity Address, Postal Zip Code 90066
City Area Code (310)
Local Phone Number 924-6037
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Entity Emerging Growth Company true
Entity Ex Transition Period false
Class A Common Stock 0.0001 Par Value Per Share [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Class A Common stock, $0.0001 par value per share
Trading Symbol SST
Security Exchange Name NYSE
Redeemable Warrants Each Whole Warrant Exercisable For One Class A Common Stock Share At An Exercise Price Of 11.50 Per Share [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Redeemable warrants, each whole warrant exercisable for one Class A common stock share at an exercise price of $11.50 per share
Trading Symbol SST.WS
Security Exchange Name NYSE