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Commitments Member Non Cancelable Inventory And Other Services Purchase Commitments Member [Member] Non Cancelable Inventory And Other Services Purchase Commitments Member Capitalized internal use software development costs Payments to Develop Software Interest rate Debt Instrument, Interest Rate, Stated Percentage Accounts payable and accrued expenses Total Accounts Payable and Accrued Liabilities, Current Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Cash paid for restructuring costs Payments For Restructuring And Merger Related Costs Payments For Restructuring And Merger Related Costs Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Loss contracts (facilities related) Restructuring, Loss Contracts Restructuring, Loss Contracts Business Combination and Asset Acquisition [Abstract] TOTAL STOCKHOLDERS' EQUITY Beginning Balance Ending Balance Equity, Attributable to Parent Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Expected term (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term Merger, acquisition, and restructuring costs Total merger, acquisition, and restructuring costs Acquisition related costs Restructuring Charges and Business Combination, Acquisition Related Costs Restructuring Charges and Business Combination, Acquisition Related Costs Loss before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 2025 Amortization Of Debt Issuance Costs, Year Two Amortization Of Debt Issuance Costs, Year Two Debt Discount Debt Discount [Member] Debt Discount Merger, Acquisition, and Restructuring Costs Restructuring and Related Activities Disclosure [Text Block] Debt instrument, maturity trigger, outstanding, period prior to maturity date Debt Instrument, Maturity Trigger, Outstanding, Period Prior To Maturity Date Debt Instrument, Maturity Trigger, Outstanding, Period Prior To Maturity Date Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Thereafter Amortization Of Debt Discount (Premium), Year Five Amortization Of Debt Discount (Premium), Year Five Entity Emerging Growth Company Entity Emerging Growth Company Debt Issuance Costs Amortization of Debt Issuance Costs [Abstract] Amortization of Debt Issuance Costs Total Unamortized debt issuance costs Debt Issuance Costs, Net Intangible assets, net Intangible Assets, Net (Excluding Goodwill) 2014 Employee Stock Purchase Plan 2014 Employee Stock Purchase Plan [Member] 2014 Employee Stock Purchase Plan [Member] Effective interest rate Debt Instrument, Interest Rate, Effective Percentage Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Document Fiscal Period Focus Document Fiscal Period Focus Threshold trading days Debt Instrument, Convertible, Threshold Trading Days 2024 Lessee, Operating Lease, Liability, to be Paid, Year One Available borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Antidilutive Securities [Axis] Antidilutive Securities [Axis] 2027 Lessee, Operating Lease, Liability, to be Paid, Year Four Title Trading Arrangement, Individual Title Lease expense Operating Lease, Expense Beginning balance (usd per share) Ending balance (usd per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Stock-based compensation Share-Based Payment Arrangement, Noncash Expense Common Stock  Common Stock [Member] Number of tranches Number of Tranches Number of Tranches Individual: Individual [Axis] City Area Code City Area Code Entity Address, Postal Zip Code Entity Address, Postal Zip Code Net Loss Per Share Earnings Per Share [Text Block] Income Statement Location [Domain] Income Statement Location [Domain] Document Fiscal Year Focus Document Fiscal Year Focus Geographical [Domain] Geographical [Domain] Term of lease contract Lessee, Operating Lease, Term of Contract Amortization of deferred financing costs Amortization of Other Deferred Charges Minimum Minimum [Member] Mobile Mobile [Member] Mobile [Member] Weighted average shares used to compute net loss per share: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Property and equipment, net Property, Plant and Equipment, Net Increase (decrease) in contra seller payable Increase (Decrease) In Accounts Payable, Seller Increase (Decrease) In Accounts Payable, Seller Schedule of Share-based Compensation, Stock Options, Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Exercise Price Award Exercise Price Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Conversion price (in USD per share) Debt Instrument, Capped Call, Conversion Price Debt Instrument, Capped Call, Conversion Price Tranche four Share-based Payment Arrangement, Tranche Four [Member] Share-based Payment Arrangement, Tranche Four Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] ASSETS Assets [Abstract] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Foreign exchange gain, net Gain (Loss), Foreign Currency Transaction, before Tax Taxes paid related to net share settlement Payment, Tax Withholding, Share-Based Payment Arrangement Other income Other Operating Income Debt issuance costs, gross Debt issuance costs Debt Issuance Costs, Gross Vesting, stock price trigger (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting, Stock Price Trigger Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting, Stock Price Trigger Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Fair Value, Assets Measured on Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Developed technology Developed Technology Rights [Member] Accumulated Deficit Retained Earnings [Member] Less: Current portion Long-Term Debt, Current Maturities Schedule of Stock Based Compensation Expense Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity Other (income) expense: Nonoperating Income (Expense) [Abstract] Other assets, non-current Other Assets, Noncurrent Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Risk-free interest rate Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Exit costs Business Exit Costs Basic (in dollars per share) Basic loss per share (in dollars per share) Earnings Per Share, Basic Right-of-use lease asset Operating Lease, Right-of-Use Asset Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Unrecognized employee stock-based compensation Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount Issuance of common stock related to employee stock purchase plan Stock Issued During Period, Value, Employee Stock Purchase Plan Accounting Policies [Abstract] Accounting Policies [Abstract] Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Remaining 2023 Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Intrinsic values of options exercised Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value CTV Connected Television [Member] Connected Television Arrangement Duration Trading Arrangement Duration In-process research and development In Process Research and Development [Member] Accounts payable—seller Accounts Payable, Seller, Current Description of balance sheet netting of assets and liabilities per ASC 210-20. Entity Address, City or Town Entity Address, City or Town Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Cash paid for income taxes Income Taxes Paid Purchase Commitment, Excluding Long-Term Commitment [Domain] Purchase Commitment, Excluding Long-Term Commitment [Domain] Other Balance Sheet Amounts Supplemental Balance Sheet Disclosures [Text Block] Paul Caine [Member] Paul Caine Restructuring charges Restructuring Charges Change in Accounting Estimate, Type [Domain] Change in Accounting Estimate, Type [Domain] Document Transition Report Document Transition Report Award Timing Predetermined Award Timing Predetermined [Flag] Remaining 2023 Contractual Obligation, to be Paid, Remainder of Fiscal Year Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Convertible notes Convertible Debt, Fair Value Disclosures Termination Date Trading Arrangement Termination Date Common stock, shares authorized (in shares) Common Stock, Shares Authorized Capitalized computer software, amortization Capitalized Computer Software, Amortization Non-cash loss contracts (facilities related) Restructuring Charges. Assumed Loss Contracts, Settled Without Cash Restructuring Charges. Assumed Loss Contracts, Settled Without Cash Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Alternate Base Rate Alternate Base Rate [Member] Alternate Base Rate Long-term debt, gross Term Loan B Facility Long-Term Debt, Gross Adjustments to reconcile net loss to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] All Trading Arrangements All Trading Arrangements [Member] All Adjustments to Compensation All Adjustments to Compensation [Member] Restructuring Reserve [Roll Forward] Restructuring Reserve [Roll Forward] Award Timing Disclosures [Line Items] Title of Individual [Domain] Title of Individual [Domain] Compensation Amount Outstanding Recovery Compensation Amount Term Loan B Facility Senior Secured Term Loan Facility [Member] Senior Secured Term Loan Facility Deferred Financing Costs Deferred Financing Costs [Member] Deferred Financing Costs Fair value of restricted stock vested Granted (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Debt Issuance Costs [Axis] Debt Issuance Costs [Axis] Debt Issuance Costs Provision for (recovery of) doubtful accounts Accounts receivable, credit loss expense (recovery) Accounts Receivable, Credit Loss Expense (Reversal) Additional paid-in capital Additional Paid in Capital Remaining 2023 Amortization Of Debt Discount (Premium), Remainder Of Fiscal Year Amortization Of Debt Discount (Premium), Remainder Of Fiscal Year Convertible Senior Notes Convertible Debt Securities [Member] Canceled (in dollars per share) Forfeited (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Loss contracts (facilities related) Restructuring Charges, Merger And Acquisition Assumed Loss Contracts Restructuring Charges, Merger And Acquisition Assumed Loss Contracts Proceeds from exercise of stock options Proceeds from Stock Options Exercised Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Number of shares issuable assuming conversion (in shares) Debt Instrument, Convertible, Number of Equity Instruments Tranche three Share-Based Payment Arrangement, Tranche Three [Member] Convertible Debt Convertible Debt [Member] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Debt, current Debt, Current Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current 2026 Finite-Lived Intangible Asset, Expected Amortization, Year Three Canceled and Forfeited (in shares) Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Debt Issuance Costs [Domain] Debt Issuance Costs [Domain] Debt Issuance Costs [Domain] Insider Trading Arrangements [Line Items] Accounts receivable, allowance for credit loss Allowance for doubtful accounts, beginning balance Allowance for doubtful accounts, ending balance Accounts Receivable, Allowance for Credit Loss 2024 Long-Term Debt, Maturity, Year One Net basis Net Revenue [Member] Net Revenue Outstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Issuance of common stock related to RSU and PSU vesting (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Entity Registrant Name Entity Registrant Name Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Award Timing Method Award Timing Method [Text Block] Performance Shares, Granted in 2023 Performance Shares, Granted in 2023 [Member] Performance Shares, Granted in 2023 2025 Finite-Lived Intangible Asset, Expected Amortization, Year Two Adjustment to Compensation, Amount Adjustment to Compensation Amount Tranche two Share-Based Payment Arrangement, Tranche Two [Member] Cost of revenue Cost of Sales [Member] Document Period End Date Document Period End Date Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Adoption Date Trading Arrangement Adoption Date Accrued holdback - indemnification claims Indemnification Claim Accrual, Current Indemnification Claim Accrual, Current Revenue from Contract with Customer Benchmark Revenue from Contract with Customer Benchmark [Member] Exercisable (usd per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price Accounts Receivable, Allowance for Credit Loss Accounts Receivable, Allowance for Credit Loss [Table Text Block] Treasury Stock Treasury Stock, Common [Member] Entity Central Index Key Entity Central Index Key Amortization of debt discount and issuance costs Amortization of Debt Issuance Costs and Discounts Organization and Summary of Significant Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Gain on disposal of property and equipment Gain (Loss) on Disposition of Property Plant Equipment Stock-based compensation expense Share-Based Payment Arrangement, Expense Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Total identifiable intangible assets, gross Finite-Lived Intangible Assets, Gross Benefit for income taxes Income Tax Expense (Benefit) Trailing consecutive trading day performance period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting, Threshold Consecutive Trading Days Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting, Threshold Consecutive Trading Days International Non-US [Member] Write-offs Accounts Receivable, Allowance for Credit Loss, Writeoff Accrued employee-related payables Employee-related Liabilities, Current Vesting [Axis] Vesting [Axis] Scenario, Adjustment Scenario, Adjustment [Member] Fair Value Measurements Fair Value Disclosures [Text Block] Name Trading Arrangement, Individual Name Other comprehensive loss Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Unamortized debt issuance costs associated with debt extinguishment Deferred Debt Issuance Cost, Writeoff Summary of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Weighted average remaining lease term Operating Lease, Weighted Average Remaining Lease Term Revenue Revenue Revenue from Contract with Customer, Excluding Assessed Tax Payment terms in days (or less) Revenue, Payment Terms Revenue, Payment Terms Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Conversion Term (ii) Conversion Term (ii) [Member] Conversion Term (ii) Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Amendment Flag Amendment Flag Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Mergers and acquisitions, net Payments to Acquire Businesses, Net of Cash Acquired Shares withheld related to net share settlement (in shares) Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Weighted average discount rate Operating Lease, Weighted Average Discount Rate, Percent Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activities Interest expense, net Interest Income (Expense), Net Credit Facility [Domain] Credit Facility [Domain] Retirement of common stock (in shares) Stock Repurchased and Retired During Period, Shares Purchase of treasury stock (in shares) Treasury Stock, Shares, Acquired Variable interest rate Debt Instrument, Basis Spread on Variable Rate Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Long-term debt, term Long-Term Debt, Term Debt, non-current, net of debt issuance costs Total non-current debt Debt, net of debt issuance costs Long-Term Debt, Excluding Current Maturities Over-allotment options Debt Instrument, Over-Allotment Options Debt Instrument, Over-Allotment Options Sales and marketing Selling and Marketing Expense [Member] Diluted (in shares) Weighted average number of shares outstanding, diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Number of additional shares authorized (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized Quarterly payments of principle balance (percent) Debt Instrument, Periodic Payment, Percentage Of Principal Debt Instrument, Periodic Payment, Percentage Of Principal Revenue Revenue from Contract with Customer [Text Block] Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Company Selected Measure Amount Company Selected Measure Amount Remaining 2023 Amortization Of Debt Issuance Costs, Remainder Of Fiscal Year Amortization Of Debt Issuance Costs, Remainder Of Fiscal Year Performance Shares, Granted in 2022 Performance Shares, Granted in 2022 [Member] Performance Shares, Granted in 2022 Additional Paid-In Capital Additional Paid-in Capital [Member] Expired (usd per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price TOTAL ASSETS Assets Name Awards Close in Time to MNPI Disclosures, Individual Name Cover [Abstract] Cover [Abstract] Net proceeds Proceeds from Convertible Debt Stock-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Amortization of debt issuance costs Amortization of debt issuance costs Amortization of Debt Issuance Costs Thereafter Long-Term Debt, Maturity, Year Five United States UNITED STATES Recurring Fair Value, Recurring [Member] Restructuring and Related Activities [Abstract] Restructuring and Related Activities [Abstract] Effective interest rate Debt Instrument, Interest Rate During Period Other liabilities, non-current Other Liabilities, Noncurrent Vested and released (in dollars per share) Vested (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Non-NEOs Non-NEOs [Member] Total lease payments (undiscounted) Lessee, Operating Lease, Liability, to be Paid CHANGE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect FINANCING ACTIVITIES: Net Cash Provided by (Used in) Financing Activities [Abstract] Secured Debt Secured Debt [Member] Non-PEO NEO Non-PEO NEO [Member] Equity Component [Domain] Equity Component [Domain] Adjustment to Compensation: Adjustment to Compensation [Axis] Total Contractual Obligation Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Debt Instrument [Line Items] Debt Instrument [Line Items] Scenario [Axis] Scenario [Axis] Basic (in shares) Weighted-average common shares outstanding, basic (in shares) Weighted Average Number of Shares Outstanding, Basic Conversion Term (i) Conversion Term (i) [Member] Conversion Term (i) Entity Current Reporting Status Entity Current Reporting Status Concentration Risk Type [Domain] Concentration Risk Type [Domain] Performance Shares, Granted in 2020 Performance Shares, Granted in 2020 [Member] Performance Shares, Granted in 2020 Loss from operations Operating Income (Loss) Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Intrinsic value of nonvested unit Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested 2025 Contractual Obligation, to be Paid, Year Two Fiscal Year Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Statement [Line Items] Statement [Line Items] Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Schedule of Nonvested Performance-Based Units Activity Schedule of Nonvested Performance-Based Units Activity [Table Text Block] Expected correlation coefficients of Magnite Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Correlation Coefficients Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Correlation Coefficients Scenario [Domain] Scenario [Domain] Weighted- Average Contractual Life Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Schedule of Debt Schedule of Debt [Table Text Block] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Customer relationships Customer Relationships [Member] Desktop Desktop [Member] Desktop [Member] Contract with Customer, Sales Channel [Domain] Contract with Customer, Sales Channel [Domain] Type of Restructuring [Domain] Type of Restructuring [Domain] Tranche one Share-Based Payment Arrangement, Tranche One [Member]