Nature of Business and Summary of Significant Accounting Policies Significant Accounting Policies [Text Block] Intangible assets amortization Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Internal-Use Software - Work in Progress Capitalized Software Work In Progress [Member] Capitalized Software Work In Progress Debt Instrument, Covenant, Period Two Debt Instrument, Covenant, Period Two [Member] Debt Instrument, Covenant, Period Two Statistical Measurement Statistical Measurement [Domain] Property & equipment Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment Thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Five Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Award Timing Predetermined Award Timing Predetermined [Flag] Share-based payment awards Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-Based Payment Arrangement, Percent Entity File Number Entity File Number Additional Paid-In Capital Additional Paid-in Capital [Member] Research and development tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Amount Impairment of Long-Lived Assets Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Tabular List, Table Tabular List [Table Text Block] Leases [Abstract] Leases [Abstract] Litigation settlement receivable, current Litigation Settlement, Receivable, Current Litigation Settlement, Receivable, Current Number of shares Business Combination, Consideration Transferred, Equity Interest, Share Issued, Number of Shares Recent Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Write-offs Financing Receivable, Allowance for Credit Loss, Writeoff Accounts payable Increase (Decrease) in Accounts Payable Secured Overnight Financing Rate (SOFR) Secured Overnight Financing Rate (SOFR) [Member] Unrealized Losses Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Net loss per share - basic (in dollars per share) Basic (in dollars per share) Earnings Per Share, Basic Adjustment to Compensation: Adjustment to Compensation [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Common stock, capital shares reserved for future issuance Common Stock, Capital Shares Reserved for Future Issuance Revenue Revenue from Contract with Customer [Text Block] Total gross deferred tax asset Deferred Tax Assets, Gross Stock, Class of Stock [Table] Stock, Class of Stock [Table] Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Schedule of Segment Reporting Information, by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] 2029 Finite-Lived Intangible Assets, Amortization Expense, Rolling Year Four Issuance of shares for employee stock purchase plan (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Vested restricted stock units (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Indefinite lived intangible Deferred Tax Liabilities Indefinite Lived Intangible Deferred Tax Liabilities Indefinite Lived Intangible Summary of Changes in the Allowance for Doubtful Finance Receivables Financing Receivable, Current, Allowance for Credit Loss [Table Text Block] Total current expense Current Income Tax Expense (Benefit) 166 Auto Auction 166 Auto Auction [Member] 166 Auto Auction Adjustment to Compensation, Amount Adjustment to Compensation Amount Basis of Consolidation Consolidation, Policy [Policy Text Block] Stock-based compensation expense, net of amounts capitalized Share-Based Payment Arrangement, Noncash Expense Deferred compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits Stock options Share-Based Payment Arrangement, Option [Member] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Schedule Of Property Plant And Equipment [Table] Property, Plant and Equipment [Table] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Percent Effective Income Tax Rate Reconciliation, Percent [Abstract] Litigation settlement, amount awarded from other party Litigation Settlement, Amount Awarded from Other Party Accounts and Financing Receivables [Table] Accounts and Financing Receivables [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Balance Balance Equity, Attributable to Parent Insider Trading Policies and Procedures [Line Items] Capitalized stock-based compensation Share-Based Payment Arrangement, Expense Customer assurance cost of revenue Customer Assurance Cost Of Revenue [Policy Text Block] Customer Assurance Cost Of Revenue Summary of Property and Equipment, Net Consisted Property, Plant and Equipment [Table Text Block] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Earning potential cap percentage Share-Based Compensation Arrangement By Share-Based Payment Award, Relative Total Shareholder Return Requirement, Earning Potential Cap Percentage Share-Based Compensation Arrangement By Share-Based Payment Award, Relative Total Shareholder Return Requirement, Earning Potential Cap Percentage Credit Spread Adjustment [Axis] Credit Spread Adjustment [Axis] Credit Spread Adjustment Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Right of use asset Deferred Tax Liabilities Right Of Use Asset Deferred Tax Liabilities Right Of Use Asset Current Assets: Assets, Current [Abstract] Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period Total liabilities and stockholders' equity Liabilities and Equity Foreign Currency Foreign Currency Transactions and Translations Policy [Policy Text Block] Marketplace and service revenue Marketplace And Service Revenue [Policy Text Block] Marketplace And Service Revenue Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Interest rate on outstanding borrowings Line of Credit Facility, Interest Rate at Period End Issuance of shares for acquisitions (in shares) Stock Issued During Period, Shares, Acquisitions Number of Options Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Liabilities and Stockholders' Equity Liabilities and Equity [Abstract] Cover Cover [Abstract] Cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Maximum Maximum [Member] Useful Lives (in years) Finite-Lived Intangible Asset, Useful Life Credit Spread Adjustment [Domain] Credit Spread Adjustment [Domain] Credit Spread Adjustment [Domain] Accounting Policies [Abstract] Accounting Policies [Abstract] Net Carrying Amount Finite-Lived Intangible Assets, Net Schedule of Maturities of Operating Lease Liabilities Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Internal-Use Software Costs, net Internal Use Software, Policy [Policy Text Block] Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Debt Instrument [Line Items] Debt Instrument [Line Items] Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Concentration of Credit Risk Concentration Risk Disclosure [Text Block] 2021 Revolver Two Thousand And Twenty One Revolver [Member] Two Thousand And Twenty One Revolver Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Pay vs Performance Disclosure [Line Items] Total Operating Lease, Liability Foreign currency translation gain (loss) Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Acquisitions Business Combination [Text Block] Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Total loss before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Entity Shell Company Entity Shell Company The August 2023 Acquisition The August 2023 Acquisition [Member] The August 2023 Acquisition Other long-term liabilities Other Liabilities, Noncurrent Debt Instrument [Table] Schedule of Long-Term Debt Instruments [Table] Impairment loss Goodwill, Impairment Loss Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Stock-based compensation, net of amount capitalized Share-Based Payment Arrangement, Amount Capitalized Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Company Selected Measure Amount Company Selected Measure Amount 2028 Lessee, Operating Lease, Liability, to be Paid, Year Three Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Other operating liabilities Increase (Decrease) in Other Noncurrent Liabilities Comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent Expired (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Name Measure Name Schedule of Loss from Continuing Operations Before Income Taxes Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] Letter Of Credit Letter of Credit [Member] Domestic Income (Loss) from Continuing Operations before Income Taxes, Domestic Summary of Share-based Compensation Expense Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Accrued other liabilities Operating Lease, Liability, Current Maturities and redemptions of marketable securities Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Executive compensation disallowance Effective Income Tax Rate Reconciliation, Nondeductible Expense, Executive Compensation, Amount Effective Income Tax Rate Reconciliation, Nondeductible Expense, Executive Compensation, Amount Class of Stock [Line Items] Class of Stock [Line Items] Document Fiscal Period Focus Document Fiscal Period Focus Credit Spread Adjustment Two Credit Spread Adjustment Two [Member] Credit Spread Adjustment Two Award Timing Method Award Timing Method [Text Block] Furniture and fixtures Furniture and Fixtures [Member] Award Type Award Type [Axis] Summary of Property Plant And Equipment Estimated Useful Lives Property Plant And Equipment Estimated Useful Lives [Table Text Block] Property Plant And Equipment Estimated Useful Lives Total assets Assets Stock-Based Compensation Share-Based Payment Arrangement [Policy Text Block] 2026 Finite-Lived Intangible Asset, Expected Amortization, Year One Trading Symbol Trading Symbol 2029 Lessee, Operating Lease, Liability, to be Paid, Year Four 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 Changes in valuation allowances Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Income Taxes Income Tax, Policy [Policy Text Block] Financing Receivable, Allowance for Credit Loss [Roll Forward] Financing Receivable, Allowance for Credit Loss [Roll Forward] Entity Address, City or Town Entity Address, City or Town Asset-Backed Commercial Paper Conduit Weighted Average Annual Rate Asset-Backed Commercial Paper Conduit Weighted Average Annual Rate [Member] Asset-Backed Commercial Paper Conduit Weighted Average Annual Rate Cash Flows from Operating Activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Research and development tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Research, Percent Weighted-average remaining useful lives Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life Internal-Use Software Costs net Intangible Assets Disclosure [Text Block] Effect of exchange rate changes on cash, cash equivalents, and restricted cash Effect of Exchange Rate on Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Total net deferred tax assets, net of allowance Deferred Tax Assets, Net of Valuation Allowance Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount RSU Restricted Stock Units (RSUs) [Member] Statement of Income Location, Balance Statement of Income Location, Balance [Domain] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Employee Benefit and Share-Based Payment Arrangement, Noncash Expense [Abstract] Employee Benefit and Share-Based Payment Arrangement, Noncash Expense [Abstract] Entity Emerging Growth Company Entity Emerging Growth Company Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Right of use assets in exchange for new lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Total assets acquired Business Combination, Recognized Asset Acquired, Asset Outstanding, beginning of period (in shares) Outstanding, end of period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number 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] Revenue Revenue from Contract with Customer, Including Assessed Tax Level 2 Fair Value, Inputs, Level 2 [Member] Document Financial Statement Error Correction [Flag] Document Financial Statement Error Correction [Flag] State and Local Income Taxes, Net of Federal Income Tax Effect Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Business Combination [Domain] Business Combination [Domain] Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Conversion of stock, shares issued (in shares) Conversion of Stock, Shares Issued Schedule of Components of Income Tax Expense Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Available-for-Sale Marketable Securities Marketable Securities [Table Text Block] Property and Equipment, net Property, Plant and Equipment, Policy [Policy Text Block] PEO PEO [Member] Excess depreciation and amortization Deferred Tax Assets Excess Depreciation And Amortization Deferred Tax Assets Excess Depreciation And Amortization Accounts Receivables & Allowance for Doubtful Receivables Loans, Notes, Trade and Other Receivables Disclosure [Text Block] Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Current expense (benefit): Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Increase in valuation allowance Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount United States UNITED STATES Changes in operating assets and liabilities, net of effects from purchases of businesses: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Exercise of common stock options Stock Issued During Period, Value, Stock Options Exercised 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] Carrying amount of the liability Guarantor Obligations, Current Carrying Value Changes in Valuation Allowances Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Schedule of Finite-Lived Intangible Assets, Future Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Accumulated Deficit Retained Earnings [Member] Income Tax Jurisdiction [Axis] Income Tax Jurisdiction [Axis] Number of RSUs Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Restatement Determination Date Restatement Determination Date Share-Based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Cash, cash equivalents, and restricted cash, beginning of period Cash, cash equivalents, and restricted cash, end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Income Statement [Abstract] Income Statement [Abstract] Provision for income taxes Total income tax expense Provision for income taxes Income Tax Expense (Benefit) Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Purchases of marketable securities Payments to Acquire Marketable Securities Common Class B Common Class B [Member] Sale of Stock [Domain] Sale of Stock [Domain] Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Product and Service Product and Service [Domain] Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Axis] Exercisable (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price Credit Spread Adjustment Three Credit Spread Adjustment Three [Member] Credit Spread Adjustment Three Guarantee term Guarantor Obligation, Term Property and equipment, gross Property, Plant and Equipment, Gross Marketplace and service Marketplace And Service [Member] Marketplace And Service Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Schedule Of Business Acquisitions By Acquisition [Table] Business Combination [Table] 2027 Finite-Lived Intangible Assets, Amortization Expense, Rolling Year Two Discretionary contributions Defined Contribution Plan, Employer Discretionary Contribution Amount Credit spread adjustment term Debt Instrument, Credit Spread Adjustment, Term Debt Instrument, Credit Spread Adjustment, Term Business Combination, Recognized Asset Acquired and Liability Assumed Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Acquisitions Goodwill, Acquired During Period Proceeds from exercise of stock options Proceeds from Stock Options Exercised City Area Code City Area Code Acquisition of businesses (net of cash acquired) Payments to Acquire Businesses, Net of Cash Acquired Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Deferred tax assets excluding certain deferred tax liabilities related to indefinite lived intangibles Deferred Tax Assets Excluding Certain Deferred Tax Liabilities Related To Indefinite Lived Intangibles [Member] Deferred Tax Assets Excluding Certain Deferred Tax Liabilities Related To Indefinite Lived Intangibles All Trading Arrangements All Trading Arrangements [Member] Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Accrued payroll Accrued Liabilities, Current US federal net operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards, Domestic Commitments and Contingencies Commitments and Contingencies, Policy [Policy Text Block] Other Adjustments Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Outstanding, beginning of period (in shares) Outstanding, end of period (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Litigation settlement, gain Litigation Settlement, Gain Net deferred tax liability Deferred Tax Liabilities, Net General and administrative General and Administrative Expense Cash Flows from Investing Activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Relative total shareholder return minimum requirement for maximum earning potential Share-Based Compensation Arrangement By Share-Based Payment Award, Relative Total Shareholder Return Requirement, Maximum Earnings Potential Range, Minimum Percentile Share-Based Compensation Arrangement By Share-Based Payment Award, Relative Total Shareholder Return Requirement, Maximum Earnings Potential Range, Minimum Percentile Foreign net operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards, Foreign Unrecognized compensation expense Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Net cash provided by (used in) operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Effective Income Tax Rate Reconciliation [Table] Effective Income Tax Rate Reconciliation [Table] Sales of marketable securities Proceeds from Sale of Debt Securities, Available-for-Sale Estimate useful life of property and equipment Property, Plant and Equipment, Useful Life Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Operations and technology Operations And Technology [Member] Operations And Technology Other current assets Business Combination, Recognized Asset Acquired, Other Asset, Current Effective Income Tax Rate Reconciliation [Line Items] Effective Income Tax Rate Reconciliation [Line Items] Selling, general, and administrative Selling, General and Administrative Expenses [Member] Cost of Sales Cost of Sales [Member] Recoveries Financing Receivable, Allowance for Credit Loss, Recovery Goodwill Beginning balance Ending balance Goodwill Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Depreciation expense Depreciation Money market funds Money Market Funds [Member] Assets Acquired Business Combination, Recognized Asset Acquired, Asset [Abstract] Federal Deferred Federal Income Tax Expense (Benefit) Equity Components Equity Components [Axis] Property Plant And Equipment [Line Items] Property, Plant and Equipment [Line Items] Auditor Name Auditor Name Share-based payment awards Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-Based Payment Arrangement, Amount Decrease in basis spread on variable rate Debt Instrument, Decrease In Basis Spread On Variable Rate Debt Instrument, Decrease In Basis Spread On Variable Rate Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Loss before income taxes: Pre Tax Book Income Loss [Abstract] Pre Tax Book Income Loss Fair market value Fair Market Value Of The Companys Class A Common Stock Fair Market Value Of The Companys Class A Common Stock Auction and inspection equipment Equipment [Member] Number of reportable segments Number of Reportable Segments Employee Benefit Plan Compensation and Employee Benefit Plans [Text Block] Expired (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period Relative total shareholder return minimum requirement for earning award Share-Based Compensation Arrangement By Share-Based Payment Award, Relative Total Shareholder Return Requirement, Minimum Percentile Share-Based Compensation Arrangement By Share-Based Payment Award, Relative Total Shareholder Return Requirement, Minimum Percentile Deferred tax assets: Components of Deferred Tax Assets [Abstract] Supplemental disclosure of cash flow information Supplemental Cash Flow Information [Abstract] Trade receivables Business Combination, Recognized Asset Acquired, Receivable, Current Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost Stock-based compensation included in capitalized software development costs Capitalized Computer Software, Additions Other Performance Measure, Amount Other Performance Measure, Amount Weighted- Average Exercise Price Per Share Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Entity Address, State or Province Entity Address, State or Province Net loss per share attributable to common stockholders: Earnings Per Share, Basic And Diluted EPS [Abstract] Earnings Per Share, Basic And Diluted EPS Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [Table] Antidilutive Security, Excluded EPS Calculation [Table] Fair Value Measurements and Financial Instruments Fair Value Measurement, Policy [Policy Text Block] Deferred Tax Asset Deferred Tax Asset [Domain] Total current liabilities Liabilities, Current Amount Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract] Individual: Individual [Axis] Vesting [Axis] Vesting [Axis] Restricted cash Restricted Cash Income Tax Jurisdiction [Domain] Income Tax Jurisdiction [Domain] Other current assets Other Assets, Current Document Annual Report Document Annual Report Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation 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] Interest expense Interest Paid, Excluding Capitalized Interest, Operating Activity Document Fiscal Year Focus Document Fiscal Year Focus Finance receivables Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Assets, Financing Receivable Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Assets, Financing Receivable Basis of Preparation Basis of Accounting, Policy [Policy Text Block] Other assets Operating Lease, Right-of-Use Asset Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Payments towards long term debt Repayments of Long-Term Debt Finance receivables (net of allowance of $29,026 and $4,191) Financing Receivable, after Allowance for Credit Loss, Current Effective Income Tax Rate Effective Income Tax Rate Reconciliation, Percent Fair value of awards vested Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments, Vested In Period, Fair Value Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments, Vested In Period, Fair Value Entity Interactive Data Current Entity Interactive Data Current Operating lease costs Operating Lease, Cost Capitalization of software costs Payments for Software Internal-Use Software - In-service Computer Software, Intangible Asset [Member] Non-cash tax charge Non Cash Tax Charge Non Cash Tax Charge Weighted average period of recognized term Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Lease liability Deferred Tax Assets Lease Liability Deferred Tax Assets Lease Liability Exercise of common stock options (in shares) Exercised (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Less valuation allowance Valuation allowance Deferred Tax Assets, Valuation Allowance Equity [Abstract] Equity [Abstract] Intrinsic value, exercisable Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value Share-based payment awards Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Amount Goodwill & Acquired Intangible Assets, net Goodwill and Intangible Assets, Policy [Policy Text Block] Less: Segment Reconciliation [Abstract] Segment Information Segment Reporting Disclosure [Text Block] Weighted average remaining amortization period (in years) Finite-Lived Intangible Assets, Remaining Amortization Period Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] 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] U.S. treasury and agency securities US Treasury Securities [Member] Net operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards Finance receivables allowance Financing Receivable, Allowance for Credit Loss, Current Federal Current Federal Tax Expense (Benefit) Long-Lived Tangible Asset Long-Lived Tangible Asset [Axis] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Finite Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Receivables Trade and Other Accounts Receivable, Unbilled Receivables, Policy [Policy Text Block] Other long-term liabilities Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Table] Fair Value, Recurring and Nonrecurring [Table] Leases Lessee, Leases [Policy Text Block] Selling, general, and administrative Selling, General and Administrative Expense Depreciation and amortization Depreciation, Depletion and Amortization Michael Waterman [Member] Michael Waterman Other assets Other Assets, Noncurrent Entity Central Index Key Entity Central Index Key PEO Name PEO Name Total revenue Revenues 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] 2026 Finite-Lived Intangible Assets, Amortization Expense, Next Rolling 12 Months Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Revolving Credit Facility Revolving Credit Facility [Member] Foreign Tax Effects Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount Arrangement Duration Trading Arrangement Duration Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Share-Based Payment Arrangement, Tranche One Share-Based Payment Arrangement, Tranche One [Member] Contract liabilities Contract with Customer, Liability, Current Computer equipment Computer equipment Computer Equipment [Member] Financial Instruments Financial Instruments Disclosure [Text Block] Segments [Axis] Segments [Axis] Other operating assets Increase (Decrease) in Prepaid Expense and Other Assets Exercise Price Award Exercise Price Entity Filer Category Entity Filer Category Litigation settlement receivable, noncurrent Litigation Settlement, Receivable, Noncurrent Litigation Settlement, Receivable, Noncurrent Class of Stock Class of Stock [Domain] Local Phone Number Local Phone Number Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Valuation Allowance by Deferred Tax Asset Valuation Allowance by Deferred Tax Asset [Axis] U.S. Federal Statutory Tax Rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Stock-Based Compensation Share-Based Payment Arrangement [Text Block] The March 13th, 2024 Acquisition The March 13th, 2024 Acquisition [Member] The March 13th, 2024 Acquisition Intangible assets Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill Cash and cash equivalents Business Combination, Recognized Asset Acquired, Cash and Cash Equivalent Thereafter Finite-Lived Intangible Assets, Amortization Expense, Rolling after Year Five Assets Assets [Abstract] Credit Facility Credit Facility [Axis] Underlying Security Market Price Change Underlying Security Market Price Change, Percent 2028 Finite-Lived Intangible Asset, Expected Amortization, Year Three Depreciation and amortization Depreciation, Depletion, and Amortization [Policy Text Block] Vesting [Domain] Vesting [Domain] Financing receivable Financing Receivable, before Allowance for Credit Loss Debt Instrument Debt Instrument [Axis] 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 Fair Value Measurement Fair Value Disclosures [Text Block] Business Combination [Line Items] Business Combination [Line Items] Gross Carrying Amount Finite-Lived Intangible Assets, Gross Credit Facility Credit Facility [Domain] Schedule of Internal-Use Software Costs, Future Amortization Expense Schedule Of Internal Use Software Costs Future Amortization Expense [Table Text Block] Schedule Of Internal Use Software Costs Future Amortization Expense Stockholders' Equity: Equity, Attributable to Parent [Abstract] 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] Shares outstanding, conversion threshold percentage Number Of Share Outstanding, Conversion Threshold Percentage Number Of Share Outstanding, Conversion Threshold Percentage Award vesting percentage Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage Entity Address, Address Line One Entity Address, Address Line One Technology and development Research and Development Expense Accumulated Other Comprehensive Loss (Income) AOCI Attributable to Parent [Member] Interest rate Debt Instrument, Interest Rate, Stated Percentage Trade receivables allowance Accounts Receivable, Allowance for Credit Loss, Current Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] Debt Securities, Available-for-Sale, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] Other long-term liabilities Operating Lease, Liability, Noncurrent Entity Voluntary Filers Entity Voluntary Filers Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] Guarantees, Commitments and Contingencies Commitments Contingencies and Guarantees [Text Block] Fair Value as of Grant Date Award Grant Date Fair Value Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Abstract] Entity Registrant Name Entity Registrant Name Performance period Share-Based Compensation Arrangement by Share-Based Payment Award, Performance Period Share-Based Compensation Arrangement by Share-Based Payment Award, Performance Period SOFR floor Debt Instrument, SOFR Floor Debt Instrument, SOFR Floor Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Unrecognized compensation expense Employee Benefits and Share-Based Compensation Amortization expense Capitalized Computer Software, Amortization Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Auction marketplace revenue Auction Marketplace Revenue [Member] Auction Marketplace Revenue Forfeited (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Total financial assets Assets, Fair Value Disclosure Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Counterparty Name [Domain] Counterparty Name [Domain] 2027 Lessee, Operating Lease, Liability, to be Paid, Year Two Number of operating segments Number of Operating Segments Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Weighted average remaining contractual term, outstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 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 Title Trading Arrangement, Individual Title Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Schedule of Finite-Lived Intangible Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Restatement Determination Date: Restatement Determination Date [Axis] Cash consideration Payments to Acquire Businesses, Gross Non-PEO NEO Non-PEO NEO [Member] Foreign Deferred Foreign Income Tax Expense (Benefit) Intrinsic value, outstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Outstanding letters of credit Letters of Credit Outstanding, Amount Deferred Revenue Business Combination, Recognized Liability Assumed, Deferred Revenue, Current Summary of Restricted Stock Unit Activity Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value [Table Text Block] Number of reporting units Number of Reporting Units Issuance of shares for employee stock purchase plan Stock Issued During Period, Value, Employee Stock Purchase Plan Schedule of Operating Lease Liabilities and Right-of-use Assets Schedule Of Operating Lease Liabilities And Right Of Use Assets [Table Text Block] Schedule Of Operating Lease Liabilities And Right Of Use Assets Other financing activities Proceeds from (Payment for) Other Financing Activity Liabilities Assumed Business Combination, Recognized Liability Assumed, Liability [Abstract] Sale of Stock [Axis] Sale of Stock [Axis] Other acquired intangibles Other Intangible Assets [Member] Unrealized Gain Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Name Trading Arrangement, Individual Name Beginning balance Ending balance Financing Receivable, Allowance for Credit Loss Award Type Award Type [Domain] 2026 Lessee, Operating Lease, Liability, to be Paid, Year One Equity Awards Adjustments Equity Awards Adjustments [Member] Other non-cash, net Other Noncash Income (Expense) Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Canada CANADA Compensation Amount Outstanding Recovery Compensation Amount Deferred expense (benefit): Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Provision for bad debt Provision For Bad Debt Provision For Bad Debt Auction and inspection equipment Auction And Inspection Equipment [Member] Auction And Inspection Equipment Debt Instrument, Name Debt Instrument, Name [Domain] Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Contract revenue Contract with Customer, Liability, Revenue Recognized Deferred Tax Asset, Valuation Allowance [Table] Deferred Tax Asset, Valuation Allowance [Table] Acquired intangible assets (net of amortization of $40,202 and $28,972) Acquired Intangible Assets Net Acquired Intangible Assets Net Auditor Information [Abstract] Auditor Information [Abstract] Auditor Information Fair value cash consideration Business Combination, Consideration Transferred, Equity Interest Summary of Changes in the Allowance for Doubtful Trade Receivables Accounts Receivable, Allowance for Credit Loss [Table Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Name Awards Close in Time to MNPI Disclosures, Individual Name Foreign Tax Effects Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent Outstanding, beginning of period (in dollars per shares) Outstanding, end of period (in dollars per shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Unvested RSUs and other awards Unvested Restricted Stock Award And Restricted Stock Units [Member] Unvested Restricted Stock Award And Restricted Stock Units Denominator: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Net write-offs Allowance For Doubtful Accounts Receivable Write Offs Net Allowance For Doubtful Accounts Receivable Write Offs Net Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] 2021 ESPP Employee Stock [Member] Operations and technology Operations And Technology Expense Operations And Technology Expense ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Revenue: Revenues [Abstract] Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Accrued other liabilities Accrued Other Liabilities Current Accrued Other Liabilities Current Schedule of Fair Value of Options Vested and the Intrinsic Value from the Exercise of Options Schedule of Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Grant Date Intrinsic Value [Table Text Block] Stock-based compensation APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Sales and marketing Selling and Marketing Expense Debt Instrument, Covenant, Period [Domain] Debt Instrument, Covenant, Period [Domain] Debt Instrument, Covenant, Period [Domain] Financial Instruments [Domain] Financial Instruments [Domain] Executive compensation disallowance Effective Income Tax Rate Reconciliation, Nondeductible Expense, Executive Compensation, Percent Effective Income Tax Rate Reconciliation, Nondeductible Expense, Executive Compensation, Percent Debt Instrument, Covenant, Period One Debt Instrument, Covenant, Period One [Member] Debt Instrument, Covenant, Period One Foreign Tax Jurisdiction Foreign Tax Jurisdiction [Member] Auditor Firm ID Auditor Firm ID Segments [Domain] Segments [Domain] State net operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards, State and Local Cash paid during the period for: Cash Paid Received During Period [Abstract] Cash Paid Received During Period Statement of Income Location, Balance Statement of Income Location, Balance [Axis] Foreign Income (Loss) from Continuing Operations before Income Taxes, Foreign Performance Shares Performance Shares [Member] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Domain] Other Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount Schedule Of Accounting Standards Update and Change in Accounting Principle Accounting Standards Update and Change in Accounting Principle [Table Text Block] Finite-Lived Intangible Assets by Major Class Finite-Lived Intangible Assets by Major Class [Axis] ACV Segment ACV Segment [Member] ACV Segment Minimum Minimum [Member] Net Loss Per Share Attributable to Common Stockholders Earnings Per Share, Policy [Policy Text Block] Accumulated depreciation Less accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Measurement period adjustments Goodwill, Measurement Period Adjustment Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Company Selected Measure Name Company Selected Measure Name Data services revenue Data Services Revenue [Member] Data Services Revenue Provision for bad debt Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease) Revenue Recognition Revenue [Policy Text Block] Marketplace and service cost of revenue Cost of Goods and Service [Policy Text Block] Borrowings Debt Disclosure [Text Block] Preferred stock; $0.001 par value; 20,000 shares authorized; 0 and 0 shares issued and outstanding at December 31, 2025 and December 31, 2024, respectively Preferred Stock, Value, Issued Operating expenses: Operating Income (Loss) [Abstract] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Accounts payable Accounts Payable, Current Warehouse Facility Warehouse Facility [Member] Warehouse Facility Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Total liabilities assumed Business Combination, Recognized Liability Assumed, Liability All Executive Categories All Executive Categories [Member] Stock-based compensation expense Share-Based Payment Arrangement, Expensed and Capitalized, Amount Schedule of Deferred Tax Assets (Liabilities) Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Capitalized software amortization Accumulated Amortization Capitalized Computer Software, Accumulated Amortization Common stock Common Stock, Value, Issued Foreign Current Foreign Tax Expense (Benefit) Goodwill [Roll Forward] Goodwill [Roll Forward] Share-Based Payment Arrangement, Tranche Two Share-Based Payment Arrangement, Tranche Two [Member] Weighted-average shares - diluted (in shares) Weighted-average number of shares of common stock - diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Commitments and Contingencies (Note 8) Commitments and Contingencies Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Cash Acquired from Acquisition Cash Acquired from Acquisition Business Combination [Axis] Business Combination [Axis] Entity Small Business Entity Small Business Gross Carrying Amount Capitalized Computer Software, Gross Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Proceeds from employee stock purchase plan Proceeds From Employee Stock Purchase Plan Proceeds From Employee Stock Purchase Plan Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding State Current State and Local Tax Expense (Benefit) Document Transition Report Document Transition Report Other assets Business Combination, Recognized Asset Acquired, Other Asset, Noncurrent Valuation Allowance [Line Items] Valuation Allowance [Line Items] Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Numerator: Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Conversion of Class B common stock to Class A common stocks (in shares) Stock Issued During Period, Shares, Conversion Of Class B Common Stocks To Class A Common Stocks Stock Issued During Period, Shares, Conversion Of Class B Common Stocks To Class A Common Stocks Underlying Securities Award Underlying Securities Amount Net write-offs Financing Receivable Allowance For Credit Losses Write Offs Net [Abstract] Financing Receivable Allowance For Credit Losses Write Offs Net Payment of RSU tax withholdings in exchange for common shares surrendered by RSU holders Payment Of RSU Tax Withholdings In Exchange For Common Shares Surrendered By RSU Holders Payment Of RSU Tax Withholdings In Exchange For Common Shares Surrendered By RSU Holders Equity Component Equity Component [Domain] Net write-offs Financing Receivable, Allowance for Credit Loss, Writeoff, after Recovery Document Period End Date Document Period End Date Debt Instrument, Covenant, Period [Axis] Debt Instrument, Covenant, Period [Axis] Debt Instrument, Covenant, Period PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Cash and Cash Equivalents Cash and Cash Equivalents [Domain] Long-term debt Long-Term Line of Credit, Noncurrent Indiana Auto Auction Indiana Auto Auction [Member] Indiana Auto Auction Income Taxes Income Tax Disclosure [Text Block] Other marketplace revenue Other Marketplace Revenue [Member] Other Marketplace Revenue 2030 Finite-Lived Intangible Assets, Amortization Expense, Rolling Year Five Common Class A Common Class A [Member] Beginning balance Ending balance Accounts Receivable, Allowance for Credit Loss Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Weighted average remaining contractual term, exercisable Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Total stockholders' equity Equity, Including Portion Attributable to Noncontrolling Interest Income tax benefit from changes in valuation allowance as result of acquisitions Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Acquisition, Amount Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Acquisition, Amount Accruals and reserves Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals Risks and Uncertainties [Abstract] Risks and Uncertainties [Abstract] Customer assurance Customer Assurance [Member] Customer Assurance Document Type Document Type Level 3 Fair Value, Inputs, Level 3 [Member] Net Income (Loss) Per Share Earnings Per Share [Text Block] Name Outstanding Recovery, Individual Name Advertising and marketing expenses Marketing and Advertising Expense Additional paid-in capital Additional Paid in Capital Product and Service Product and Service [Axis] Credit spread adjustment Debt Instrument, Credit Spread Adjustment Debt Instrument, Credit Spread Adjustment All Individuals All Individuals [Member] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Name Forgone Recovery, Individual Name Total current assets Assets, Current Amortization expense relating to purchased intangible assets Finite-Lived Intangible Assets Acquired Statistical Measurement Statistical Measurement [Axis] 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] Vehicles Vehicles [Member] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Foreign currency translation Goodwill, Foreign Currency Translation, Gain (Loss) Intrinsic value of options exercised Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Intrinsic Value France FRANCE Commitments And Contingencies [Line Items] Commitments And Contingencies [Line Items] Commitments And Contingencies Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Net loss attributable to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Schedule Of Finite Lived Intangible Assets [Table] Intangible Asset, Finite-Lived [Table] Current Liabilities: Liabilities, Current [Abstract] Total operating expenses Operating Expenses Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Long-term line of credit Long-Term Line of Credit Level 1 Fair Value, Inputs, Level 1 [Member] Balance (in shares) Balance (in shares) Shares, Outstanding Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Accounts payable Business Combination, Recognized Liability Assumed, Accounts Payable, Current Net loss per share - diluted (in dollars per share) Diluted (in dollars per share) Earnings Per Share, Diluted Nature of Business Nature Of Business [Policy Text Block] Nature Of Business Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Trade receivables (net of allowance of $3,829 and $6,372) Accounts Receivable, after Allowance for Credit Loss, Current Title of 12(b) Security Title of 12(b) Security Non-cash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Earnings Per Share [Abstract] Earnings Per Share [Abstract] 2030 Lessee, Operating Lease, Liability, to be Paid, Year Five Investments, Debt and Equity Securities [Abstract] Auditor Location Auditor Location Net write-offs Allowance For Doubtful Account Receivables Write Offs Net [Abstract] Allowance For Doubtful Account Receivables Write Offs Net Summary of Potentially Dilutive Shares Excluded from Computation of Net Loss Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Provision for taxes Provision for Other Credit Losses Marketable securities Debt Securities, Available-for-Sale, Current Domestic Tax Jurisdiction Domestic Tax Jurisdiction [Member] Less imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Other Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent Income taxes Income Taxes Paid, Net Exercised (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price 2027 Finite-Lived Intangible Asset, Expected Amortization, Year Two Tricolor Holdings, LLC Tricolor Holdings, LLC [Member] Tricolor Holdings, LLC Award Timing Disclosures [Line Items] Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer NYFRB NYFRB [Member] NYFRB Recoveries Accounts Receivable, Allowance for Credit Loss, Recovery Property and Equipment, net Property, Plant and Equipment Disclosure [Text Block] Total lease payments Lessee, Operating Lease, Liability, to be Paid Net unrealized gains on available-for-sale securities OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Stockholders' Equity Equity [Text Block] State Deferred State and Local Income Tax Expense (Benefit) Net loss Net loss Net loss Net Income (Loss) Attributable to Parent Expiration Date Trading Arrangement Expiration Date Accrued payroll Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Liabilities, Accrued Payroll Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Current Liabilities, Accrued Payroll Operating lease liabilities: Operating Lease, Liability [Abstract] Commitments And Contingencies [Table] Commitments And Contingencies [Table] Commitments And Contingencies Schedule of Reconciliation of Income Taxes at The Federal Statutory Rate to Actual Income Taxes Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Accounts Receivable, Allowance for Credit Loss [Roll Forward] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Other Adjustments Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Property and equipment (net of accumulated depreciation of $6,589 and $5,227) Property and equipment, net Property, Plant and Equipment, Net Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Adoption Date Trading Arrangement Adoption Date Base Rate Base Rate [Member] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Trade receivables Increase (Decrease) in Accounts Receivable Alliance Auto Auctions Alliance Auto Auctions [Member] Alliance Auto Auctions The April 2023 Acquisition The April 2023 Acquisition [Member] The April 2023 Acquisition 2028 Finite-Lived Intangible Assets, Amortization Expense, Rolling Year Three Entity Current Reporting Status Entity Current Reporting Status Selling, general and administrative Selling, General and Administrative Expenses, Policy [Policy Text Block] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Customer relationships Customer Relationships [Member] Loss from operations Operating Income (Loss) Payments to Acquire Real Estate Payments to Acquire Real Estate Accumulated deficit Retained Earnings (Accumulated Deficit) U.S. Federal Statutory Tax Rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Leasehold improvements Leaseholds and Leasehold Improvements [Member] Financial Instrument [Axis] Financial Instrument [Axis] Statement of Financial Position [Abstract] Statement of Financial Position [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] Executive Category: Executive Category [Axis] Share-based payment awards Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Percent State and Local Income Taxes, Net of Federal Income Tax Effect Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Proceeds from long term debt Proceeds from Issuance of Long-Term Debt Class of Stock Class of Stock [Axis] Current Fiscal Year End Date Current Fiscal Year End Date Developed technology Technology-Based Intangible Assets [Member] Ireland IRELAND Accrued other liabilities Business Combination, Recognized Liability Assumed, Other Liability, Current Finite-Lived Intangible Assets, Major Class Name Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Net [Abstract] Finite-Lived Intangible Assets, Net [Abstract] 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] Weighted- Average Grant-Date Fair Value Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Total other (expense) income Other Nonoperating Income (Expense) Statement [Table] Statement [Table] Total deferred expense Deferred Income Tax Expense (Benefit) Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Cash Flows from Financing Activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Votes per share Common Stock, Number Of Votes Common Stock, Number Of Votes Net assets acquired Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill Other foreign jurisdictions Foreign Tax Jurisdiction, Other [Member] Operations and technology Personnel Operations And Technology Expenses [Policy Text Block] Personnel Operations And Technology Expenses Management Estimates Management and Investment Advisory Fees, Policy [Policy Text Block] Accounts Receivable, after Allowance for Credit Loss [Abstract] Accounts Receivable, after Allowance for Credit Loss [Abstract] Payments for debt issuance and other financing costs Payments For Debt Issuance And Other Financing Costs Payments For Debt Issuance And Other Financing Costs Variable Rate [Domain] Variable Rate [Domain] Summary of Financial Assets Measured at Fair Value On Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Operating lease right of use assets: Operating Lease, Right-of-Use Asset [Abstract] Operating Lease, Right-of-Use Asset Customer assurance revenue Customer Assurance Revenue [Policy Text Block] Customer Assurance Revenue Issuance of shares for acquisitions Stock Issued During Period, Value, Acquisitions Net assets (liabilities) assumed Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less) Uncertain tax positions Unrecognized Tax Benefits Potentially dilutive securities excluded from computation of diluted net loss per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount All Adjustments to Compensation All Adjustments to Compensation [Member] Amendment Flag Amendment Flag Credit Spread Adjustment One Credit Spread Adjustment One [Member] Credit Spread Adjustment One Summary of Acquired Intangible Assets Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block] Proceeds from sale of real estate Proceeds from Sale, Real Estate, Held-for-Investment Leases Lessee, Operating Leases [Text Block] Termination Date Trading Arrangement Termination Date Net cash provided by (used in) financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Measure: Measure [Axis] Financing receivable credit loss Financing Receivable, Credit Loss, Expense (Reversal) Share-Based Payment Arrangement, Tranche Three Share-Based Payment Arrangement, Tranche Three [Member] Weighted-average discount rate Operating Lease, Weighted Average Discount Rate, Percent Summary of Stock Option Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Long-Lived Tangible Asset Long-Lived Tangible Asset [Domain] Vested restricted stock units Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Weighted-average shares - basic (in shares) Weighted-average number of shares of common stock - basic (in shares) Weighted Average Number of Shares Outstanding, Basic Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Table] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Maximum net leverage ratio Debt Instrument, Covenant, Leverage Ratio, Maximum Debt Instrument, Covenant, Leverage Ratio, Maximum allowed Cost of revenue (excluding depreciation & amortization) Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization Schedule of Basic And Diluted Net Loss Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Exercisable (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number Number of businesses acquired Business Combination, Number of Businesses Acquired Segment Reporting [Abstract] Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Short term operating lease expenses Operating Lease, Expense Debt Disclosure [Abstract] Debt Disclosure [Abstract] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Other (expense) income: Nonoperating Income (Expense) [Abstract] Entity Tax Identification Number Entity Tax Identification Number Provision for bad debt Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) Sale price of vehicles with outstanding guarantee Guarantor Obligations, Liquidation Proceeds, Monetary Amount Write-offs Accounts Receivable, Allowance for Credit Loss, Writeoff Cash dividends Dividends, Cash Outstanding, beginning of period (in dollars per share) Outstanding, end of period (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares issued (in shares) Common Stock, Shares, Issued Weighted-average remaining lease term Operating Lease, Weighted Average Remaining Lease Term Goodwill and Acquired Intangibles Goodwill and Intangible Assets Disclosure [Text Block] Restricted Stock Units And Common Stock Option Restricted Stock Units And Common Stock Option [Member] Restricted Stock Units And Common Stock Option Other comprehensive loss: Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent, Parenthetical Disclosure [Abstract] Outstanding letter of credit issued Line of Credit Facility, Fair Value of Amount Outstanding Conversion of Class B common stock to Class A common stock Stock Issued During Period, Value, Conversion Of Class B Common Stocks To Class A Common Stocks Stock Issued During Period, Value, Conversion Of Class B Common Stocks To Class A Common Stocks Entity Public Float Entity Public Float Summary of Goodwill Schedule of Goodwill [Table Text Block] Interest expense Interest Expense, Nonoperating Trading Arrangement: Trading Arrangement [Axis] Total Shareholder Return Amount Total Shareholder Return Amount Insider Trading Arrangements [Line Items] Security Exchange Name Security Exchange Name Forfeited (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Net increase in finance receivables Payments to Acquire Finance Receivables Goodwill impairment Goodwill and Intangible Asset Impairment Total liabilities Liabilities Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Cash and Cash Equivalents Cash and Cash Equivalents [Axis] Internal-use software costs (net of amortization of $67,874 and $38,499) Net Carrying Amount Capitalized Computer Software, Net Maximum principal amount Line of Credit Facility, Maximum Borrowing Capacity Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Marketplace operations Marketplace Operations Expense Marketplace Operations Expense Net Carrying Amount Finite-Lived Intangible Assets Subject To Amortization, Net Finite-Lived Intangible Assets Subject To Amortization, Net Statement [Line Items] Statement [Line Items] Variable Rate [Axis] Variable Rate [Axis] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Cash and cash equivalents Cash and Cash Equivalent Counterparty Name [Axis] Counterparty Name [Axis] Deferred tax liabilities: Components of Deferred Tax Liabilities [Abstract] Marketplace and service cost of revenue (excluding depreciation & amortization) Marketplace And Service Cost Of Revenue [Member] Marketplace And Service Cost Of Revenue Common Stock Common Stock [Member] Vested (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period Fair Value Marketable securities Debt Securities, Available-for-Sale Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Non-NEOs Non-NEOs [Member] Corporate securities Corporate Debt Securities [Member] Net increase (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 Interest income Interest Income Interest Income