Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] CouponFollow Incentive Plan CouponFollow Incentive Plan [Member] CouponFollow Incentive Plan [Member] Cash rewards Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Share-Based Liabilities Paid Trading Arrangement: Trading Arrangement [Axis] Conversion of Class C shares to Class A shares (in shares) Stock Issued During Period, Share, Conversion Stock Issued During Period, Share, Conversion Maximum Maximum [Member] Statistical Measurement [Domain] Statistical Measurement [Domain] Debt instrument, quarterly amortization percentage Debt Instrument Quarterly Amortization Percentage Debt Instrument Quarterly Amortization Percentage Title of 12(b) Security Title of 12(b) Security Subsequent event Subsequent Event [Member] Document Fiscal Year Focus Document Fiscal Year Focus Adjustment to Compensation, Amount Adjustment to Compensation Amount Segment Reporting [Abstract] Common stock value Common Stock, Value, Issued Accrued payroll and related benefits Employee-related Liabilities, Current Schedule of Long-Term Debt Instruments Schedule of Long-Term Debt Instruments [Table Text Block] Line of Credit Line of Credit [Member] Restatement Determination Date Restatement Determination Date Noncash lease expense Noncash Lease Expense Noncash Lease Expense Issuance of restricted stock, net of forfeitures and shares withheld for taxes (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Amendment Flag Amendment Flag Goodwill [Line Items] Goodwill [Line Items] Current liabilities: Liabilities, Current [Abstract] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Internal-use software development costs Capitalized Computer Software, In Progress Capitalized Computer Software, In Progress Developed technology Developed Technology Rights [Member] Change in fair value of warrant liabilities Change in fair value of warrant liabilities Fair Value Adjustment of Warrants Stock appreciation rights, granted (in dollars per share) Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Strick Price, Grants In Period Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Strick Price, Grants In Period Other cost of revenue Other Cost of Operating Revenue Microsoft Microsoft [Member] Microsoft [Member] Amortization Amortization Tranche III SARs Tranche III SARs [Member] Tranche III SARs Period of financial report distribution to lender Period Of Financial Report Distribution To Lender Period Of Financial Report Distribution To Lender Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Entity Address, State or Province Entity Address, State or Province PEO Total Compensation Amount PEO Total Compensation Amount Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Intangible assets, net Intangible assets, net Intangible Asset, Excluding Goodwill, after Accumulated Amortization Accrued expenses and other current liabilities Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Weighted average number of shares outstanding - basic (in shares) Weighted-average common shares outstanding used in computing basic net loss per share (in shares) Weighted Average Number of Shares Outstanding, Basic Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Number of reportable segments Number of Reportable Segments Total current liabilities Liabilities, Current Customer relationships Customer Relationships [Member] Salaries and benefits Salaries and benefits Salaries And Benefits Salaries And Benefits Entity Address, City or Town Entity Address, City or Town Schedule of Accrued Expenses and Other Liabilities Schedule Of Accrued Expenses And Other Liabilities [Table Text Block] Schedule Of Accrued Expenses And Other Liabilities [Table Text Block] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Cover Document Information [Line Items] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Class of Stock [Axis] Class of Stock [Axis] Accrued expenses and other current liabilities Accrued expenses and other current liabilities Accrued Expenses And Other Liabilities, Current Accrued Expenses And Other Liabilities, Current Internal-use software development costs, net Net Carrying Amount Intangible Asset, Finite-Lived, after Accumulated Amortization Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Additional remediate period Additional Remediate Period Additional Remediate Period Fair Value, Inputs, Level 2 Fair Value, Inputs, Level 2 [Member] Accumulated Amortization Intangible Asset, Finite-Lived, Accumulated Amortization Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Other comprehensive loss Other Comprehensive Income (Loss), Net of Tax Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] United States UNITED STATES Subsequent Event Type [Axis] Subsequent Event Type [Axis] Issuance of common stock in private placement (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Gross Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Accounting Pronouncements Not Yet Adopted New Accounting Pronouncements, Policy [Policy Text Block] Schedule of Segment Reporting Information Segment Reporting [Table Text Block] Non-Controlling Interest Noncontrolling Interest [Member] Other comprehensive loss: Other Comprehensive Income (Loss), before Tax [Abstract] Use of Estimates Use of Estimates, Policy [Policy Text Block] Amortization of debt issuance costs Amortization of Debt Issuance Costs Long-term liability Total debt, net Long-Term Debt Document Period End Date Document Period End Date Changes in operating assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Principle amount Debt Instrument, Face Amount Operating expenses: Costs and Expenses [Abstract] Security Exchange Name Security Exchange Name Term of loan Debt Instrument, Term Treasury stock, at cost - 190 and 137 shares as of June 30, 2026 and December 31, 2025, respectively Treasury Stock, Common, Value Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Operating lease liabilities, current Operating Lease, Liability, Current Statement of Comprehensive Income [Abstract] Trademarks and trade names Trademarks and Trade Names [Member] Net Loss Per Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Earnings Per Share [Abstract] Earnings Per Share [Abstract] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Exercised (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Exercised Total liabilities Liabilities Trading Symbol Trading Symbol Geographical [Domain] Geographical [Domain] convertible preferred stock (in shares) Convertible Preferred Stock, Shares Issued upon Conversion Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Company Selected Measure Name Company Selected Measure Name Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Long-term debt Long-Term Debt, Gross Credit Facility [Domain] Credit Facility [Domain] Cash Flows from Operating Activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Beginning balance (in shares) Ending balance (in shares) Preferred shares (in shares) Shares, Issued Compensation Amount Outstanding Recovery Compensation Amount Individual: Individual [Axis] Warrant Warrant [Member] Weighted average number of shares outstanding - diluted (in shares) Weighted-average common shares outstanding used in computing diluted net loss per share (in shares) Weighted Average Number of Shares Outstanding, Diluted Entity Emerging Growth Company Entity Emerging Growth Company Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Deferred tax benefits Deferred Income Taxes and Tax Credits Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Impairment, long-lived asset Long-Lived Asset, Held and Used, Impairment Loss Award Timing Predetermined Award Timing Predetermined [Flag] Restricted cash, current Restricted Cash, Current Treasury Stock, at cost Treasury Stock, Common [Member] Intangible Asset, Goodwill and Other [Abstract] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Stock-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Software Software, Internally Developed [Member] Effective income tax rate reconciliation Effective Income Tax Rate Reconciliation, Percent Organization, Consolidation and Presentation of Financial Statements [Abstract] Net working capital Net Working Capital Net Working Capital All Executive Categories All Executive Categories [Member] Class A common stock repurchases Stock Repurchased and Retired During Period, Value Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Long-term debt, fair value Long-Term Debt, Fair Value Vesting [Domain] Vesting [Domain] Plan Name [Domain] Plan Name [Domain] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Scenario [Domain] Scenario [Domain] Reconciliation of cash, cash equivalents and restricted cash to the condensed consolidated balance sheets: Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation [Abstract] Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Preferred stock, initial conversion price (in dollars per share) Preferred Stock, Convertible, Conversion Price Schedule of Basic and Diluted Net Loss Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Interest payable in kind, percent Debt Instrument, Interest Payable In Kind, Percent Debt Instrument, Interest Payable In Kind, Percent Debt Disclosure [Abstract] Noncontrolling Interest [Line Items] Noncontrolling Interest [Line Items] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Segment Reporting Segment Reporting [Text Block] Minimum Minimum [Member] Long-term line of credit Long-Term Line of Credit Expiration Date Trading Arrangement Expiration Date Tranche II SARs Tranche II SARs [Member] Tranche II SARs Denominator: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Schedule of Amortization Expense Intangible Asset, Finite-Lived, Amortization Expense [Table Text Block] Effect of exchange rate changes in cash, cash equivalent and restricted cash Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Location, Statement of Income, Balance [Axis] Location, Statement of Income, Balance [Axis] Restricted cash Restricted Cash and Cash Equivalent Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Total stockholders' equity Beginning balance Ending balance Equity, Including Portion Attributable to Noncontrolling Interest Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Segment adjusted gross profit Adjusted Gross Profit Adjusted Gross Profit Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Other expense: Other Income and Expenses [Abstract] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Antidilutive Security, Excluded EPS Calculation [Table] Antidilutive Security, Excluded EPS Calculation [Table] Schedule of Product Information [Table] Nature of Operation, Product Information, Concentration of Risk [Table] Exercise Price Award Exercise Price Cash Flows from Investing Activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Issuance of restricted stock, net of forfeitures and shares withheld for taxes Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Segment Reporting [Line Items] Segment Reporting [Line Items] Document Quarterly Report Document Quarterly Report Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Segments [Domain] Segments [Domain] Debt, Net Debt Disclosure [Text Block] Aggregate amount Repayments of Long-Term Debt Scenario [Axis] Scenario [Axis] Tranche IV SARs Tranche IV SARs [Member] Tranche IV SARs Unamortized discount Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Intangible assets Finite-Lived Intangible Assets [Member] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Equity Component [Domain] Equity Component [Domain] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Secured Debt Secured Debt [Member] Total operating expenses Costs and Expenses Adoption Date Trading Arrangement Adoption Date S1 Holdco, LLC S1 Holdco, LLC [Member] S1 Holdco, LLC [Member] Counterparty Name [Domain] Counterparty Name [Domain] Total stockholders' equity attributable to System1, Inc. Equity, Attributable to Parent ASSETS Assets [Abstract] Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Loan fees Debt Instrument, Fee Amount Accounting Policies [Abstract] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Insider Trading Policies and Procedures [Line Items] Other, net Proceeds from (Payment for) Other Financing Activity Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Selling, general, and administrative Selling, general, and administrative Selling, General and Administrative Expense Repayment of term loan One-time cash payment to lenders Repayments of Debt Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Line Items] Number of contracts Number Of Paid Search Advertising Partnership Contract Number Of Paid Search Advertising Partnership Contract Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Number of operating segments Number of Operating Segments Antidilutive shares (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Entity Central Index Key Entity Central Index Key All Adjustments to Compensation All Adjustments to Compensation [Member] Other, net Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Other Item Proceeds from private placement of Class A common stock Proceeds from Issuance of Private Placement Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Aggregate initial stated value Preferred Stock, Liquidation Preference, Value One-time costs Restructuring and Related Cost, Incurred Cost Net cash (used in) provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Income Statement [Abstract] Stockholders' equity: Equity, Attributable to Parent [Abstract] Document Transition Report Document Transition Report Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Dividends accruing at a rate (in percent) Preferred Stock, Dividend Rate, Percentage Margin premium (in percent) Debt Instrument Payment In Kind Interest Rate Margin Premium Debt Instrument Payment In Kind Interest Rate Margin Premium Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Intangible Asset, Finite-Lived Intangible Asset, Finite-Lived [Table Text Block] Debt instrument, basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate City Area Code City Area Code Variable Rate [Domain] Variable Rate [Domain] Depreciation and amortization Depreciation, Depletion And Amortization Excluding Debt Issuance Costs, Including Discontinued Operations Depreciation, Depletion And Amortization Excluding Debt Issuance Costs, Including Discontinued Operations Income Tax Examination [Line Items] Income Tax Examination [Line Items] Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Document Information [Table] Document Information [Table] All Individuals All Individuals [Member] Schedule of Revenues Disaggregated by Geographic Region Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue [Table Text Block] Name Forgone Recovery, Individual Name Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Statement [Line Items] Statement [Line Items] Total assets Assets Entity [Domain] Entity [Domain] Term Loan and Revolving Facility Term Loan and Revolving Facility [Member] Term Loan and a Revolving Facility Interest expense, net Interest expense, net Interest Expense, Nonoperating Credit agreement, leverage ratio Debt Instrument, Credit Agreement, Leverage Ratio Debt Instrument, Credit Agreement, Leverage Ratio Contribution from members Noncontrolling Interest, Increase from Sale of Parent Equity Interest Stock-Based Compensation Share-Based Payment Arrangement [Text Block] Organization and Description of Business Nature of Operations [Text Block] PEO PEO [Member] Obligated to pay, year two Contractual Obligation, to be Paid, Year Two TRA payment including interest amount Noncontrolling Interest, Payment On Tax Receivable Agreement Noncontrolling Interest, Payment On Tax Receivable Agreement Stock-based compensation expense Share-Based Payment Arrangement, Expense Other non-current liabilities Other Liabilities, Noncurrent Goodwill Goodwill Goodwill Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Discretionary bonus Deferred Compensation Cash-Based Arrangements, Liability, Current Product Information [Line Items] Product Information [Line Items] Class C Common Stock Common Class C [Member] 2022 Revolving Facility 2022 Revolving Facility [Member] 2022 Revolving Facility Subsequent Event Type [Domain] Subsequent Event Type [Domain] Payables and Accruals [Abstract] Accumulated Deficit Retained Earnings [Member] Operating lease liabilities, non-current Operating Lease, Liability, Noncurrent Revolving Credit Facility Revolving Credit Facility [Member] Series A Preferred Stock Series A Preferred Stock [Member] Internal-use software development costs Software, In-Development, Internally Developed, and Purchased [Member] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Common stock outstanding (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Diluted net loss per share (in dollars per share) Net loss attributable to System1, Inc. diluted (in dollars per share) Earnings Per Share, Diluted Entity Current Reporting Status Entity Current Reporting Status Net cash used in financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Prepaid expenses and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Amortization expense Intangible Asset, Finite-Lived, Amortization Expense Intangible Asset, Finite-Lived [Line Items] Intangible Asset, Finite-Lived [Line Items] Adjustments to reconcile net loss to net cash used in operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Share-Based Payment Arrangement [Abstract] Cash Flows from Financing Activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Revenue Revenue Total revenue Revenue from Contract with Customer, Excluding Assessed Tax Property and equipment, net Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Tranche I SARs Tranche I SARs [Member] Tranche I SARs Intangible Asset, Finite-Lived, Class [Axis] Intangible Asset, Finite-Lived, Class [Axis] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Goodwill, Internal-Use Software Development Costs, Net, and Intangible Assets, Net Intangible Asset and Goodwill [Text Block] Underlying Securities Award Underlying Securities Amount Comprehensive loss attributable to non-controlling interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Gross Carrying Amount Intangible Asset, Excluding Goodwill, before Accumulated Amortization Issuance of common stock in private placement Stock Issued During Period, Value, New Issues Incremental compensation cost Share-Based Nonemployee Services Transaction, Modification of Terms, Incremental Compensation Cost Share-Based Nonemployee Services Transaction, Modification of Terms, Incremental Compensation Cost Other, net Payment for (Proceeds from) Other Investing Activity Segment Reporting [Table] Segment Reporting [Table] Accrued Expenses and Other Current Liabilities Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block] Liabilities recognized Business Combination, Contingent Consideration, Liability, Current Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Operating loss Operating Income (Loss) Current Fiscal Year End Date Current Fiscal Year End Date Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Income Tax Examination [Table] Income Tax, Examination [Table] Distribution to members Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Impairment of long-lived assets Asset, Impairment Loss Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Common stock issued (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Treasury stock, at cost (in shares) Beginning balance (in shares) Ending balance (in shares) Treasury Stock, Common, Shares Equity Components [Axis] Equity Components [Axis] Accounts receivable Increase (Decrease) in Accounts Receivable Cash (refunds) paid for income taxes, net Income Tax Paid, after Refund Received Class A Common Stock Class A Common Stock Common Class A [Member] Entity Interactive Data Current Entity Interactive Data Current Variable Rate [Axis] Variable Rate [Axis] Less: Net loss attributable to non-controlling interest Net Income (Loss) Attributable to Noncontrolling Interest Deferred tax liability Deferred Income Tax Liabilities, Net Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Entity Small Business Entity Small Business Comprehensive loss attributable to System1, Inc. Comprehensive Income (Loss), Net of Tax, Attributable to Parent Termination Date Trading Arrangement Termination Date Noncontrolling Interest [Table] Noncontrolling Interest [Table] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Other current liabilities Other Liabilities, Current Other non-current assets Other Assets, Noncurrent Document Type Document Type Fair Value as of Grant Date Award Grant Date Fair Value Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Goodwill [Table] Goodwill [Table] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Arrangement Duration Trading Arrangement Duration Statement of Stockholders' Equity [Abstract] Proceeds from term loan Proceeds from Issuance of Long-Term Debt Local Phone Number Local Phone Number Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Marketing Marketing Segment [Member] Marketing Segment Loss before income tax Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Google Google [Member] Google [Member] Commitments and contingencies (Note 7) Commitments and Contingencies Gross Carrying Amount Intangible Asset, Finite-Lived, before Accumulated Amortization Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] Amortization quarterly payment Debt Instrument, Amortization Quarterly Payment Debt Instrument, Amortization Quarterly Payment Counterparty Name [Axis] Counterparty Name [Axis] LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity [Abstract] Intangible Asset, Finite-Lived, Class [Domain] Intangible Asset, Finite-Lived, Class [Domain] Obligated to pay, year three Contractual Obligation, to be Paid, Year Three Award Type [Domain] Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Supplemental cash flow information: Supplemental Cash Flow Information [Abstract] Class A common stock repurchases (in shares) Treasury Stock, Shares, Acquired PEO Name PEO Name Geographical [Axis] Geographical [Axis] Risks and Concentrations Concentration Risk, Credit Risk, Policy [Policy Text Block] Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Legal Entity [Axis] Legal Entity [Axis] Class A common stock repurchases Treasury Stock, Value, Acquired, Cost Method Cash, cash equivalents and restricted cash, beginning of the period Cash, cash equivalents and restricted cash, end of the period Total cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Intangible Asset, Finite-Lived [Table] Intangible Asset, Finite-Lived [Table] Accounts payable Increase (Decrease) in Accounts Payable Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Term Loan Term Loan [Member] Term Loan Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Comprehensive loss Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Debt Instrument [Axis] Debt Instrument [Axis] Stock-based compensation Share-Based Payment Arrangement, Noncash Expense Products Products Segment [Member] Products Segment Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Basic net loss per share (in dollars per share) Net loss attributable to System1, Inc. basic (in dollars per share) Earnings Per Share, Basic Schedule of Total Stock-Based Compensation Expense Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block] Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Long-term debt, net Long-Term Debt, Excluding Current Maturities Stock appreciation rights, outstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Adjusted EBITDA, Trailing Twelve-Month Period Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Adjusted EBITDA, Trailing Twelve-Month Period Cost of revenue Cost of Revenue Award Type [Axis] Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Accumulated deficit Retained Earnings (Accumulated Deficit) Restricted cash, non-current Restricted Cash, Noncurrent Share-based compensation liabilities Business Combination, Contingent Consideration, Change in Contingent Consideration, Liability, Increase (Decrease) Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common Stock Common Stock [Member] 2022 Incentive Award Plan 2022 Incentive Award Plan [Member] 2022 Incentive Award Plan Tranche IV SARs Three Tranche IV SARs Three [Member] Tranche IV SARs Three Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Other countries Non-US [Member] Preferred stock, initial stated value (in dollars per share) Preferred Stock, Convertible, Stated Value Per Share Preferred Stock, Convertible, Stated Value Per Share Tranche IV SARs Two Tranche IV SARs Two [Member] Tranche IV SARs Two Equity Awards Adjustments Equity Awards Adjustments [Member] Shared-based compensation liability Share Based Liability Current Share Based Liability Current Total liabilities and stockholders' equity Liabilities and Equity Employee Stock Option Share-Based Payment Arrangement, Option [Member] Debt, net Debt, Current Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table] Segment Reporting, Entity-Wide Information Not Provided as Part of Reportable Segment, Geographical Area, Revenue and Long-Lived Asset [Table] Non-controlling interest Equity, Attributable to Noncontrolling Interest Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Plan Name [Axis] Plan Name [Axis] Excess of cash flow sweep (in percent) Debt Instrument, Covenant Terms Debt Instrument, Covenant Terms Tabular List, Table Tabular List [Table Text Block] Vesting [Axis] Vesting [Axis] Additional paid-in capital Additional Paid in Capital Other non-current liabilities Increase (Decrease) in Other Noncurrent Liabilities Total other expense, net Other Nonoperating Income (Expense) Name Awards Close in Time to MNPI Disclosures, Individual Name Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Adjustment to Compensation: Adjustment to Compensation [Axis] Class of Stock [Domain] Class of Stock [Domain] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activity Statement of Cash Flows [Abstract] Obligated to pay, year one Contractual Obligation, to be Paid, Year One Credit Facility [Axis] Credit Facility [Axis] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Name Measure Name Less: segment cost of revenue Cost Of Revenue, Net Cost Of Revenue, Net Income Taxes Income Tax Disclosure [Text Block] Foreign currency translation (loss) income Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Debt Instrument [Line Items] Debt Instrument [Line Items] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Additional Paid-In-Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Accrued revenue share Accrued Revenue Share Current Accrued Revenue Share Current Goodwill impairment loss Goodwill, Impairment Loss Tranche IV SARs One Tranche IV SARs One [Member] Tranche IV SARs One Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent Stock-based compensation included in capitalized software development costs Stock-based Compensation Included In Capitalized Software Development Costs Stock-based compensation included in capitalized software development costs. Capitalized software development costs Payments for Software Company Selected Measure Amount Company Selected Measure Amount Secured Overnight Financing Rate (SOFR) Secured Overnight Financing Rate (SOFR) [Member] Net loss Net loss Net loss Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Current assets: Assets, Current [Abstract] Non-PEO NEO Non-PEO NEO [Member] Interest Rate Floor Interest Rate Floor [Member] Entity Address, Address Line One Entity Address, Address Line One Right-of-use assets obtained in exchange for operating lease obligations Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Income tax benefit Income Tax Expense (Benefit) Award Timing Method Award Timing Method [Text Block] Principles of Consolidation Consolidation, Policy [Policy Text Block] Net decrease in cash, cash equivalents and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forecast Forecast [Member] Priority Term Loans Priority Term Loans [Member] Priority Term Loans Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Net loss attributable to System1, Inc. Net loss attributable to System1, Inc. Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Statement [Table] Statement [Table] Restatement Determination Date: Restatement Determination Date [Axis] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Numerator: Net Income (Loss) Available to Common Stockholders, Diluted [Abstract] Debt instrument covenant percentage Debt Instrument Covenant Percentage Debt Instrument Covenant Percentage