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Duration Trading Arrangement Duration Schedule of the Amount of Gain or Loss Recognized in AOCI Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block] Issuance of common stock in connection with Employee Stock Purchase Plan Stock Issued During Period, Value, Employee Stock Purchase Plan Held-to-maturity investments Debt Securities, Held-to-Maturity, Excluding Accrued Interest, after Allowance for Credit Loss, Current Beginning of the period, January 1, 2024 End of the period, September 30, 2024 Contract with Customer, Asset, before Allowance for Credit Loss Amortized cost Debt Securities, Held-to-Maturity, Amortized Cost Excluding Accrued Interest, after Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date [Abstract] Net loss on hedging instruments during the period Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax Stockholders’ equity: Equity, Attributable to Parent [Abstract] Granted (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Money market funds - escrow account Deposits [Member] Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Interest Rate Floor Interest Rate Floor [Member] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Line of credit facility, term Debt Instrument, Term All Individuals All Individuals [Member] Gross amount of cash collateral received from counterparties for securities lending transactions Security Loaned, Subject to Master Netting Arrangement, before Offset Draws on credit facilities Proceeds from Lines of Credit PEO PEO [Member] Unrealized Losses Debt Securities, Held-to-Maturity, Accumulated Unrecognized Loss Cryptocurrencies Cryptocurrencies [Member] Cryptocurrencies Variable Rate [Axis] Variable Rate [Axis] Income Tax Disclosure [Abstract] Entities [Table] Entities [Table] Name Trading Arrangement, Individual Name Other income (expense), net Other Nonoperating Income (Expense) Statement of Stockholders' Equity [Abstract] Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Gold subscription revenues Gold Subscription Revenues [Member] Gold Subscription Revenues Capitalization of internally developed software Payments to Develop Software Additional damages sought value Loss Contingency, Additional Damages Sought, Value Loss Contingency, Additional Damages Sought, Value Schedule of Concentration of Credit Risk Schedules of Concentration of Risk, by Risk Factor [Table Text Block] Business Combination, Asset Acquisition, and Joint Venture Formation [Abstract] Awards Close in Time to MNPI Disclosures, Table Awards Close in 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Master Netting Arrangement, Collateral, Right to Reclaim Cash Not Offset Schedule of Interest Revenue Earned and Interest Expense Paid from Fully-paid Securities Lending Interest Revenue Earned And Interest Expense Paid From Fully-Paid Securities Lending [Table Text Block] Interest Revenue Earned And Interest Expense Paid From Fully-Paid Securities Lending Accounts payable and accrued expenses Accounts Payable and Accrued Liabilities, Current Capitalized contract cost, impairment loss Capitalized Contract Cost, Impairment Loss Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Net amount Security Loaned, Including Not Subject to Master Netting Arrangement, after Offset and Deduction Local Phone Number Local Phone Number Asset Acquisitions Asset Acquisitions, Policy [Policy Text Block] Asset Acquisition Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Securities pledged Financial Instruments, Owned, at Fair Value Allowance for Credit Losses Debt Securities, Held-to-Maturity, Allowance for Credit Loss Total operating expenses Operating Expenses Repurchases of common stock ( in shares) Stock Repurchased During Period, Shares Reallocation of net income as a result of conversion of Class B to Class A common stock Dilutive Securities, Effect on Basic Earnings Per Share, Dilutive Convertible Securities Customer advance limit Program Agreement, Customer Advance Limit Program Agreement, Customer Advance Limit Other current and non-current assets Increase (Decrease) in Other Operating Assets Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Number of classes of common stock Number of Classes Common Stock Number of Classes Common Stock SOFR Secured Overnight Financing Rate (SOFR) [Member] PEO Total Compensation Amount PEO Total Compensation Amount Receivables from brokers, dealers, and clearing organizations Receivable from 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March 2024 Credit Agreement [Member] RHM March 2024 Credit Agreement Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Foreign currency translation Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Beginning balance Ending balance Off-Balance-Sheet, Credit Loss, Liability Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount 2013, 2020 and 2021 Plan Equity Incentive Plan, 2013, 2020 and 2021 [Member] Equity Incentive Plan, 2013, 2020 and 2021 Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Equity Component [Domain] Equity Component [Domain] Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Financial Instrument [Axis] Financial Instrument [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] RECENT ACCOUNTING PRONOUNCEMENTS Accounting Standards Update and Change in Accounting Principle [Text Block] Share-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Entity Shell Company Entity Shell Company Measurement Basis [Axis] Measurement Basis [Axis] Entity Incorporation, State Entity Incorporation, State or Country Code Common Class B Class B Common Class B [Member] Title Trading Arrangement, Individual Title Consolidated Entities [Axis] Consolidated Entities [Axis] Statement [Table] Statement [Table] Counterparty Name [Axis] Counterparty Name [Axis] Measurement Frequency [Domain] Measurement Frequency [Domain] Variable Interest Entities Consolidation, Variable Interest Entity, Policy [Policy Text Block] City Area Code City Area Code Current liabilities: Liabilities, Current [Abstract] Share repurchase program period Share Repurchase Program, Period in Force Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activities Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Level 1 Fair Value, Inputs, Level 1 [Member] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Foreign currency translation Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Total current assets Assets, Current Statement of Cash Flows [Abstract] Technology and development Technology and Development Expense Technology and Development Expense Fully-Paid Securities Lending Fully-Paid Securities Lending [Member] Fully-Paid Securities Lending Reconciliation of cash, cash equivalents, segregated cash and restricted cash, end of the period: Reconciliation Of Cash, Cash Equivalents, Segregated Cash And Restricted Cash [Abstract] Reconciliation Of Cash, Cash Equivalents, Segregated Cash And Restricted Cash Remaining borrowing capacity Line of Credit Facility, Remaining Borrowing 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Brokerage Related Receivables Brokerage Related Receivables [Member] Brokerage Related Receivables Repurchase and retirement of common stock ( in shares) Stock Repurchased and Retired During Period, Shares Class of Stock [Domain] Class of Stock [Domain] Equity securities - securities owned Equity Securities, Securities Owned [Member] Equity Securities, Securities Owned General and administrative General and Administrative Expense Time-Based RSUs Time-Based Restricted Stock Units (RSUs) [Member] Time-Based Restricted Stock Units (RSUs) Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Equity Awards Adjustments Equity Awards Adjustments [Member] Total lease liabilities Operating Lease, Liability Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Third Parties Third Parties [Member] Third Parties Underlying Securities Award Underlying Securities Amount Receivables from brokers, dealers, and clearing organizations Increase (Decrease) in Receivable from Broker-Dealer and Clearing Organization Credit Facility [Axis] Credit Facility [Axis] Total as percentage of total revenue Total as Percentage of Total Revenue [Member] Total as Percentage of Total Revenue Amendment Flag Amendment Flag Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Pledging Purpose [Domain] Pledging Purpose [Domain] Entity Registrant Name Entity Registrant Name Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Depreciation and amortization Depreciation, Depletion and Amortization Fractional shares repurchase obligations Equity Securities, Fractional Share Repurchase Obligations [Member] Equity Securities, Fractional Share Repurchase Obligations Customer advance limit threshold Program Agreement, Customer Advance Limit, Threshold Program Agreement, Customer Advance Limit, Threshold Fair Value as of Grant Date Award Grant Date Fair Value Customer Concentration Risk Customer Concentration Risk [Member] Level 2 Fair Value, Inputs, Level 2 [Member] FINANCING ACTIVITIES AND OFF-BALANCE SHEET RISK Debt Disclosure [Text Block] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Offsetting Assets [Table] Offsetting Assets [Table] Collections of purchased credit card receivables Proceeds From Purchases Of Credit Card Receivables Proceeds From Purchases Of Credit Card Receivables Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Schedule of Revenue Disaggregated by Revenue Source Disaggregation of Revenue [Table Text Block] Available-for-sale investments Debt Securities, Available-for-Sale, Excluding Accrued Interest, Current Entity Address, Postal Zip Code Entity Address, Postal Zip Code Schedule of Share-Based Compensation Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Consolidation Consolidation, Policy [Policy Text Block] Restatement Determination Date: Restatement Determination Date [Axis] Title of each class Title of 12(b) Security Concentration Risk Type [Axis] Concentration Risk Type [Axis] Common stock, value Common Stock, Value, Issued Cash and cash equivalents Cash and cash equivalents, end of the period Cash and Cash Equivalents, at Carrying Value Litigation Status [Axis] Litigation Status [Axis] Other Payments for (Proceeds from) Other Investing Activities Certificates of deposit Certificates of Deposit [Member] 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] 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 Schedule of Allowance for Credit Losses Receivable Contract with Customer, Asset, Allowance for Credit Loss [Table Text Block] Financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] 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] Concentration Risk [Line Items] Concentration Risk [Line Items] Preferred stock, $0.0001 par value. 210,000,000 shares authorized, no shares issued and outstanding as of December 31, 2023 and September 30, 2024. Preferred Stock, Value, Issued Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Employee Stock Purchase Plan ("ESPP") Share-Based Payment Arrangement [Member] Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Basic (in dollars per share) Basic EPS (in dollars per share) Earnings Per Share, Basic Securities Sold under Agreements to Repurchase Securities Sold under Agreements to Repurchase [Member] Proceeds from issuance of common stock under the Employee Stock Purchase Plan Proceeds from Stock Plans Payments for operating lease liabilities Operating Lease, Payments Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Provision for credit losses Credit and Debit Card Receivables, at Carrying Value Designated as Hedging Instrument Designated as Hedging Instrument [Member] Basic Net income (loss) attributable to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Total current liabilities Liabilities, Current 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] Weighted-average shares used to compute net income (loss) per share attributable to common stockholders: Denominator Weighted Average Number of Shares Outstanding, Diluted [Abstract] Total assets Assets Concentrations of Credit Risk Concentration Risk, Credit Risk, Policy [Policy Text Block] Outstanding borrowings, long-term Long-Term Line of Credit Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Other non-current liabilities Other Liabilities, Noncurrent Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Fair Value Total Total held-to-maturity investments Debt Securities, Held-to-Maturity, Fair Value Commitments and contingencies (Note 14) Commitments and Contingencies SECURITIES BORROWING AND LENDING Offsetting Assets and Liabilities [Text Block] Offsetting Assets and Liabilities Marketing Marketing Expense Termination Date Trading Arrangement Termination Date Class of Warrant or Right [Domain] Class of Warrant or Right [Domain] Exercise price (in dollars per share) Class of Warrant or Right, Exercise Price of Warrants or Rights Liabilities Securities Sold under Agreements to Repurchase [Abstract] Fair 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Share-Based Payment Arrangement, Expense Reversal Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Fair value of securities borrowed from users and third parties Fair value of securities borrowed from users and third parties Security Borrowed, Subject to Master Netting Arrangement, Collateral, Obligation to Return Cash Not Offset Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] Loss Contingencies [Table] Loss Contingencies [Table] Canceled (in shares) Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Schedule of Assets Subject to Master Netting Arrangement Offsetting Assets [Table Text Block] Unrealized Gains Debt Securities, Held-to-Maturity, Accumulated Unrecognized Gain Business Acquisition [Axis] Business Acquisition [Axis] Ethereum (ETH) Ethereum Digital Assets [Member] Ethereum Digital Assets ALLOWANCE FOR CREDIT LOSSES Allowance for Credit Losses [Text Block] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] MNA Holdco LLC MNA Holdco LLC [Member] MNA Holdco LLC 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] Entity File Number Entity File Number Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Liabilities Liabilities, Fair Value Disclosure [Abstract] Net gain (loss) on hedging instruments Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax Consolidated Entities [Domain] Consolidated Entities [Domain] REVENUES Revenue from Contract with Customer [Text Block] Document Fiscal Year Focus Document Fiscal Year Focus Income Statement [Abstract] Entity Address, Street Entity Address, Address Line One RHS March 2024 Credit Agreement RHS March 2024 Credit Agreement [Member] RHS March 2024 Credit Agreement Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Fair Value Disclosure of Asset and Liability Not Measured at Fair Value [Table] Fair Value Disclosure of Asset and Liability Not Measured at Fair Value [Table] Effect of foreign exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Continuing Operations Payables to users Increase (Decrease) in Payables to Customers Denominator Weighted Average Number of Shares Outstanding, Basic [Abstract] Total financial assets Assets, Fair Value Disclosure Name Forgone Recovery, Individual Name Document Period End Date Document Period End Date Sale of Stock [Axis] Sale of Stock [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Base Rate Base Rate [Member] Unvested restricted stock, beginning balance (in shares) Unvested restricted stock, ending balance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Insider Trading Arrangements [Line Items] Purchases of credit card receivables by Credit Card Funding Trust Purchases of credit card receivables by Credit Card Funding Trust Payments to Acquire Receivables Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Deposits with clearing organizations Deposits with Clearing Organizations and Others, Securities Dogecoin (DOGE) Dogecoin Digital Assets [Member] Dogecoin Digital Assets PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Interest revenue Interest Income, Operating Proceeds from 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Entity Current Reporting Status Securities lending, net Securities Lending, Net [Member] Securities Lending, Net Accumulated deficit Retained Earnings [Member] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Litigation Status [Domain] Litigation Status [Domain] Asset Acquisition [Domain] Asset Acquisition [Domain] April 2023 Credit Agreement April 2023 Credit Agreement [Member] April 2023 Credit Agreement Basic (in shares) Weighted-average common stock outstanding - basic (in shares) Weighted Average Number of Shares Outstanding, Basic Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Other Other Revenue [Member] Other Revenue Increase (decrease) in stockholder's equity Increase (Decrease) in Stockholders' Equity [Roll Forward] Executive Category: Executive Category [Axis] Name Awards Close in Time to MNPI Disclosures, Individual Name RHM March 2024 Credit Facility, Tranche B and C RHM March 2024 Credit Facility, Tranche B 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