Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] Payables due to sellers Payables To Sellers, Current Payables To Sellers, Current Maximum Maximum [Member] Statistical Measurement [Domain] Statistical Measurement [Domain] Title of 12(b) Security Title of 12(b) Security Subsequent Event Subsequent Event [Member] Debt Securities, Available-for-Sale [Table] Debt Securities, Available-for-Sale [Table] Document Fiscal Year Focus Document Fiscal Year Focus Adjustment to Compensation, Amount Adjustment to Compensation Amount Financial Instrument [Axis] Financial Instrument [Axis] Outstanding Restricted Stock Units Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Sale of AFS debt securities Debt Securities, Available-for-Sale, Sold at Par Value Annual increase in number of shares that may be issued, term (in years) Share-Based Compensation Arrangement By Share-based Payment Award, Number Of Shares Authorized, Annual Increase Term Share-Based Compensation Arrangement By Share-based Payment Award, Number Of Shares Authorized, Annual Increase Term Common stock, $0.01 par value; 400,000,000 shares authorized as of September 30, 2026 and December 31, 2025; 45,430,068 and 44,086,361 shares issued as of September 30, 2026 and December 31, 2025, respectively; and 34,050,988 and 36,848,301 outstanding as of September 30, 2026 and December 31, 2025, respectively Common Stock, Value, Issued 2027 2027 Lessee, Operating Lease, Liability, to be Paid, Year One Payments for taxes related to net share settlement of stock-based compensation awards Payment, Tax Withholding, Share-Based Payment Arrangement Compensation & benefits Employee-related Liabilities, Current Loss contingency accrual Loss Contingency Accrual Sales and other indirect tax contingencies Sales And Excise Tax Contingencies Payable, Current Sales And Excise Tax Contingencies Payable, Current Entity Ex Transition Period Entity Ex Transition Period Restatement Determination Date Restatement Determination Date Available-for-sale, debt securities credit losses Debt Securities, Available-for-Sale, Transfer in, Allowance for Credit Loss, Expense Amendment Flag Amendment Flag Current liabilities: Liabilities, Current [Abstract] Other Other Sundry Liabilities, Current Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Maximum number of shares that may be issued, annual increase percentage Share-Based Compensation Arrangement By Share-based Payment Award, Number Of Shares Authorized, Annual Increase Percentage Share-Based Compensation Arrangement By Share-based Payment Award, Number Of Shares Authorized, Annual Increase Percentage Unrealized Loss Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Schedule of Short-term Investments Debt Securities, Available-for-Sale [Table Text Block] Leases [Abstract] Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Schedule of Treasury Stock Purchased Under Stock Repurchase Programs Share Repurchase Program [Table Text Block] Share Repurchase Program Schedule of Cash and Cash Equivalents Schedule of Cash and Cash Equivalents [Table Text Block] Property, Plant, and Equipment [Abstract] Entity Address, State or Province Entity Address, State or Province Stock options granted (in shares) Granted (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Foreign currency translation adjustment, net of tax of $0 for each of the three and nine months ended September 30, 2026 and 2025 Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent PEO Total Compensation Amount PEO Total Compensation Amount Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Beginning balance, outstanding (in shares) Ending balance, outstanding (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number Share Repurchase Program [Domain] Share Repurchase Program [Domain] Weighted average common shares outstanding—basic (in shares) Weighted Average Number of Shares Outstanding, Basic Vesting Tranche One Share-Based Payment Arrangement, Tranche One [Member] Accretion of discounts and amortization of premiums on short-term investments, net Accretion (Amortization) of Discounts and Premiums, Investments Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Number of reportable segments Number of Reportable Segments Total current liabilities Liabilities, Current 2030 2030 Lessee, Operating 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by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Unrealized gains on short-term investments, tax OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, Tax Grant date fair value of restricted stock units vested Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Maximum shares that may be issued (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Operating lease liabilities, current Operating Lease, Liability, Current Securities in a continuous unrealized loss position for 12 months or longer Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Segment Information Segment Reporting, Policy [Policy 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[Text Block] Vesting [Domain] Vesting [Domain] Plan Name [Domain] Plan Name [Domain] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Beginning balance, outstanding (in dollars per share) Ending balance, outstanding (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price Sales and marketing Selling and Marketing Expense Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Concentration Risk Type [Domain] Concentration Risk Type [Domain] 2030 Contractual Obligation, to be Paid, Year Four Lease Obligations Operating Lease, Liability [Abstract] Schedule of Computation of Basic and Diluted Net Loss Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Fair Value Disclosures [Abstract] Short-Term Investments Investment in Debt and Equity Securities and Other Trading Assets [Text Block] Maturities of short-term investments Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale Minimum Minimum [Member] Sublease Cash Receipts Lessor, Operating Lease, Payment to be Received, Fiscal Year Maturity [Abstract] Expiration Date Trading Arrangement Expiration Date Schedule of Net Revenue by Type of Service Disaggregation of Revenue [Table Text Block] Denominator: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] 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 Income Statement Location [Axis] Location, Statement of Income, Balance [Axis] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Total cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Outstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted-Average Remaining Contractual Term 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] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Common stock, authorized (in shares) Common Stock, Shares Authorized Stock Options - New Employees Share-Based Payment Arrangement, Option, New Employees [Member] Share-Based Payment Arrangement, Option, New Employees Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Security, Excluded EPS Calculation [Table] Options vested and exercisable Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value Schedule of Restricted Stock Units Activity Share-Based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] 2025 Stock Repurchase Program Stock Repurchase Program, 2025 [Member] Stock Repurchase Program, 2025 Exercise Price Award Exercise Price Schedule of Restructuring and Related Costs [Table] Restructuring Cost [Table] Cash flows from investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Stock repurchase program, authorized amount Share Repurchase Program, Authorized, Amount Document Quarterly Report Document Quarterly Report 2027 Lessor, Operating Lease, Payment to be Received, Year One Provision for transaction losses, returns and refunds Provision For Transaction Losses, Returns And Refunds Provision For Transaction Losses, Returns And Refunds 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] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Contractual obligation Total Contractual Obligation Restricted Cash and Cash Equivalents [Axis] Restricted Cash and Cash Equivalents [Axis] Schedule of Commitments Under Purchase Obligations Contractual Obligation, Fiscal Year Maturity [Table Text Block] Schedule of Restructuring Charges Restructuring and Related Costs [Table Text Block] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Receivables from payment processors and seller accounts Increase (Decrease) in Other Receivables Beginning Balance Ending Balance Restructuring Reserve Equity Component [Domain] Equity Component [Domain] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Adoption Date Trading Arrangement Adoption Date Total stockholders’ equity Beginning balance Ending balance Equity, Attributable to Parent Total other income, net Nonoperating Income (Expense) Restructuring Type [Axis] Restructuring Type [Axis] Assets Assets [Abstract] Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Other Liabilities Disclosure [Abstract] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Total lease liabilities Operating Lease, Liability Insider Trading Policies and Procedures [Line Items] Beginning balance, outstanding (in shares) Ending balance, outstanding (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number Accrued Expenses Accounts Payable and Accrued Liabilities Disclosure [Text Block] Accounts receivable, allowance for doubtful accounts Accounts Receivable, Allowance for Credit Loss, Current Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Type of Restructuring [Domain] Type of Restructuring [Domain] Letter of Credit Letter of Credit [Member] Cancelled/Forfeited (in dollars per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Antidilutive securities excluded from computation of diluted net loss (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Number of operating segments Number of Operating Segments Sales of short-term investments Proceeds from Sale of Short-Term Investments Restricted stock units outstanding Restricted stock units Restricted Stock Units (RSUs) [Member] Schedule of Antidilutive Securities Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Entity Central Index Key Entity Central Index Key Less: Accumulated depreciation and amortization Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization All Adjustments to Compensation All Adjustments to Compensation [Member] Equity [Abstract] 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] Net cash used in operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Income Statement [Abstract] Stockholders’ equity: Equity, Attributable to Parent [Abstract] Document Transition Report Document Transition Report Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Operating expenses: Operating Expenses [Abstract] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Fair value of stock options vested Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested in Period, Fair Value 2023 Stock Repurchase Program Stock Repurchase Program, 2023 [Member] Stock Repurchase Program, 2023 Number of
Options Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding [Roll Forward] Seller marketplace services Seller Marketplace Services [Member] Seller Marketplace Services City Area Code City Area Code Vested restricted stock units converted to common shares, net of shares withheld for employee taxes Stock Issued During Period, Value, Conversion of Units Accumulated Other Comprehensive (Loss) Income AOCI Attributable to Parent [Member] Geographic Concentration Risk Geographic Concentration Risk [Member] All Individuals All Individuals [Member] Subsequent Events Subsequent Events [Text Block] Non-cash operating lease expense Operating Lease, Right-of-Use Asset, Periodic Reduction Aggregate Intrinsic Value Share-Based Compensation Arrangement By Share-based Payment Award, Aggregate Intrinsic Value [Abstract] Share-Based Compensation Arrangement By Share-based Payment Award, Aggregate Intrinsic Value Name Forgone Recovery, Individual Name Unrecognized compensation expense, weighted-average period for recognition Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] 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] Statement [Line Items] Statement [Line Items] Total assets Assets Operating Lease Payments Lessee, Operating Lease, Liability, to be Paid, Fiscal Year Maturity [Abstract] Preferred stock, issued (in shares) Preferred Stock, Shares Issued Common stock reserved for issuance (in shares) Common Stock, Capital Shares Reserved for Future Issuance Recording of lease liability Lease Obligation Incurred Schedule of Classification of Stock-based Compensation Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Unrealized Gain Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Stock-based compensation Share-Based Payment Arrangement [Text Block] 2026 (remaining) Contractual Obligation, to be Paid, Remainder of Fiscal Year Allowance for transaction losses Accounts Receivable, Allowance For Transaction Loss, Current Accounts Receivable, Allowance For Transaction Loss, Current PEO PEO [Member] Corporate notes Corporate Note Securities [Member] Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] 2028 Contractual Obligation, to be Paid, Year Two Total stock-based compensation expense Share-Based Payment Arrangement, Expense Cash Equivalents Cash Equivalents [Member] Other liabilities Other Liabilities, Noncurrent Goodwill Goodwill Increase in common stock available for future issuance (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Cash, Cash Equivalents, and Restricted Cash Cash and Cash Equivalents, Policy [Policy Text Block] Issuance of common stock for exercise of stock options (in shares) Exercised (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Weighted-average grant date fair value of restricted stock units granted (in dollars per share) 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 Remaining maturity date one year or less Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Subsequent Event Type [Domain] Subsequent Event Type [Domain] Payables and Accruals [Abstract] Accumulated Deficit Retained Earnings [Member] Operating lease liabilities, non-current Operating Lease, Liability, Noncurrent Total operating expenses Operating Expenses Money market fund Money Market Funds [Member] Cancelled (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 Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Unrealized (losses) gains on short-term investments, net of tax of $0 for each of the three and nine months ended September 30, 2026 and 2025 OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Common stock, outstanding (in shares) Beginning balance (in shares) Ending balance (in shares) Common Stock, Shares, Outstanding Award Timing Disclosures [Line Items] Maximum number of shares that may be issued, annual increase (in shares) Share-Based Compensation Arrangement By Share-based Payment Award, Number Of Shares Authorized, Annual Increase, Shares Share-Based Compensation Arrangement By Share-based Payment Award, Number Of Shares Authorized, Annual Increase, Shares Net loss per share—diluted (in dollars per share) Net loss per share—diluted (in dollars per share) Earnings Per Share, Diluted Entity Current Reporting Status Entity Current Reporting Status Net cash used in financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Total Shareholder Return Amount Total Shareholder Return Amount Prepaid expenses and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Computer equipment and software Computer Equipment And Software [Member] Computer Equipment And Software Technology development Research and Development Expense Adjustments to reconcile net loss to net cash from operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Share-Based Payment Arrangement [Abstract] Cash flows from financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Net revenue Total net revenue Revenue from Contract with Customer, Excluding Assessed Tax Property and equipment, net Total property and equipment, net Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Other services Service, Other [Member] 2026 Stock Repurchase Program Stock Repurchase Program, 2026 [Member] Stock Repurchase Program, 2026 Financial Instruments [Domain] Financial Instruments [Domain] Schedule of Rollforward of the Charges and Payments to the Accrued Balance Schedule of Restructuring Reserve by Type of Cost [Table Text Block] RSU, Annual Awards Restricted Stock Units (RSUs), Annual Awards [Member] Restricted Stock Units (RSUs), Annual Awards Shipping Accrued Shipping Costs, Current Accrued Shipping Costs, Current Options vested and exercisable (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number Repurchase of common stock Stock Repurchased During Period, Value Issuance of common stock for exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Underlying Securities Award Underlying Securities Amount Revenue Recognition Revenue from Contract with Customer [Text Block] Prepaid expenses Prepaid Expense, Current Options vested and 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 Operating lease liabilities, weighted-average discount rate Operating Lease, Weighted Average Discount Rate, Percent Shares available for future grants (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Maximum percentage of eligible compensation Share-Based Compensation Arrangement by Share-Based Payment Award, Maximum Employee Subscription Rate Title and Position [Axis] Title and Position [Axis] Schedule of Lease Expense Lease, Cost [Table Text Block] Other current assets Other Assets, Current Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Schedule of Assets Measured at Fair Value on a Recurring Basis Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Loss from operations Operating Income (Loss) 2030 Purchase Obligation, to be Paid, Year Four Current Fiscal Year End Date Current Fiscal Year End Date Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Repurchase of common stock (in shares) Stock Repurchased During Period, Shares Restructuring Reserve [Roll Forward] Restructuring Reserve [Roll Forward] Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Entity File Number Entity File Number Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Schedule of Short-term Investments By Contractual Maturity Investments Classified by Contractual Maturity Date [Table Text Block] Common stock shares purchased for issuance under award plan (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Purchased for Award Schedule of Stock Option Activity Share-Based Payment Arrangement, Option, Activity [Table Text Block] Weighted-Average
Exercise
Price Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Restructuring costs Restructuring Costs Common stock, issued (in shares) Common Stock, Shares, Issued Measure: Measure [Axis] Treasury stock, common (in shares) Treasury stock, common (in shares) Treasury Stock, Common, Shares 2028 Purchase Obligation, to be Paid, Year Two Debt Securities, available-for-sale, continuous unrealized loss position, 12 months or longer, accumulated loss Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Equity Components [Axis] Equity Components [Axis] Accounts receivable Increase (Decrease) in Accounts Receivable Product and Service [Domain] Product and Service [Domain] Class of Stock [Line Items] Class of Stock [Line Items] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Restructuring reserve, current Restructuring expenses Restructuring Reserve, Current Entity Interactive Data Current Entity Interactive Data Current Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Vested restricted stock units converted to common shares, net of shares withheld for employee taxes (in shares) Stock Issued During Period, Shares, Conversion of Units Entity Small Business Entity Small Business Comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent 2029 2029 Lessee, Operating Lease, Liability, to be Paid, Year Three Termination Date Trading Arrangement Termination Date Property, Plant, and Equipment [Line Items] Property, Plant, and Equipment [Line Items] Subsequent Events [Abstract] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Restructuring reserve, noncurrent Restructuring Reserve, Noncurrent Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Other current liabilities Total other current liabilities Other Liabilities, Current Expiration period (in years) Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period Other assets Other Assets, Noncurrent Document Type Document Type 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] Accrued expenses Total accrued expenses Accrued Liabilities, Current Fair Value as of Grant Date Award Grant Date Fair Value Payables due to sellers Increase (Decrease) In Payables To Sellers Increase (Decrease) In Payables To Sellers Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Stock repurchase program, remaining authorized repurchase amount Share Repurchase Program, Remaining Authorized, Amount Arrangement Duration Trading Arrangement Duration Subsequent Event [Line Items] Subsequent Event [Line Items] Statement of Stockholders' Equity [Abstract] Other Obligations Purchase Obligation, Fiscal Year Maturity [Abstract] Local Phone Number Local Phone Number Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Net loss before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Commitments and contingencies (Note 13) Commitments and Contingencies Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Total property and equipment, gross Property, Plant, and Equipment, before Accumulated Depreciation, Depletion, and Amortization Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Accounting Standards Update and Change in Accounting Principle [Table] Accounting Standards Update and Change in Accounting Principle [Table] Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Provision for transaction losses Provision For Transaction Losses Provision For Transaction Losses Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Executive Category: Executive Category [Axis] Total short-term investments Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Fair Value Vesting period Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period Furniture and fixtures Furniture and Fixtures [Member] Liabilities and Stockholders’ Equity Liabilities and Equity [Abstract] 2030 Lessor, Operating Lease, Payment to be Received, Year Four 2029 Contractual Obligation, to be Paid, Year Three Award Type [Domain] Award Type [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount 2026 (remaining) 2026 (remaining) Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year Fair Value of Financial Instruments Fair Value Disclosures [Text Block] Level 3 Fair Value, Inputs, Level 3 [Member] U.S. Government agency securities US Government Agencies Debt Securities [Member] Options vested and exercisable Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted-Average Remaining Contractual Term Lessee, operating lease, term of contract (in years) Lessee, Operating Lease, Term of Contract PEO Name PEO Name Geographical [Axis] Geographical [Axis] Leasehold improvements Leasehold Improvements [Member] Restricted cash Restricted Cash Total (payments) cash receipts Lessor, Operating Lease, Payment to be Received Long-Lived Asset, Class [Axis] Long-Lived Asset, Class [Axis] Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Entity Tax Identification Number Entity Tax Identification Number Treasury common stock, value Treasury Stock, Value, Acquired, Cost Method Cash payments Payments for Restructuring Exercised (in dollars per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Cash, cash equivalents, and restricted cash at beginning of the period Cash, cash equivalents, and restricted cash at end of the period Total cash, cash equivalents, and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Professional fees Accrued Professional Fees, Current Other Other Accrued Liabilities, Current Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] Non-NEOs Non-NEOs [Member] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Subsequent Event [Table] Subsequent Event [Table] Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Total lease expense, net Lease, Cost Purchase price percentage Share-Based Compensation Arrangement by Share-Based Payment Award, Purchase Price of Common Stock, Percent Lessee, lease not yet commenced, renewal term (in years) Lessee, Operating Lease, Lease Not yet Commenced, Renewal Term ESPP Employee Stock [Member] Leases Lessee, Operating Leases [Text Block] Net loss per share—basic (in dollars per share) Net loss per share—basic (in dollars per share) Earnings Per Share, Basic Payments for repurchase of common stock Payments for Repurchase of Common Stock Total current assets Assets, Current Statistical Measurement [Axis] Statistical Measurement [Axis] Insider Trading Arrangements [Line Items] Weighted-Average
Remaining
Contractual
Term (Years) Share-Based Compensation Arrangement By Share-based Payment Award, Weighted Average Remaining Contractual Term [Abstract] Share-Based Compensation Arrangement By Share-based Payment Award, Weighted Average Remaining Contractual Term Award Type [Axis] Award Type [Axis] Short-term lease expense Short-Term Lease, Cost Number of votes per common share Number of Votes Per Common Share Number of Votes Per Common Share 2026 (remaining) Lessor, Operating Lease, Payment to be Received, Remainder of Fiscal Year Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss Accounts receivable, net of allowance for doubtful accounts of $76 and $72 at September 30, 2026 and December 31, 2025, respectively Accounts Receivable, after Allowance for Credit Loss, Current Accumulated deficit Retained Earnings (Accumulated Deficit) Product and Service [Axis] Product and Service [Axis] Restricted cash, non-current Restricted Cash, Noncurrent 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] Number of reporting units Goodwill, Reporting Unit, Number Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common Stock Common Stock [Member] Operating lease expense Operating Lease, Cost Employee Severance Employee Severance [Member] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Concentration risk, percentage Concentration Risk, Percentage Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Equity Awards Adjustments Equity Awards Adjustments [Member] 2026 (remaining) Purchase Obligation, to be Paid, Remainder of Fiscal Year Realized gains on sale of AFS debt securities Debt Securities, Available-for-Sale, Realized Gain (Loss) Total liabilities and stockholders’ equity Liabilities and Equity Variable lease expense Variable Lease, Cost Options to purchase common stock Employee Stock Option Share-Based Payment Arrangement, Option [Member] Other current liabilities and other liabilities Increase (Decrease) in Other Operating Liabilities Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Plan Name [Axis] Plan Name [Axis] Restructuring expenses Restructuring Charges Tabular List, Table Tabular List [Table Text Block] Vesting [Axis] Vesting [Axis] Additional paid-in capital Additional Paid in Capital Sales & use taxes payable Sales and Excise Tax Payable, Current Other, net Other Nonoperating Income (Expense) Name Awards Close in Time to MNPI Disclosures, Individual Name Foreign currency translation adjustment, tax Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax, Portion Attributable to Parent 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] Outstanding Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value Cancelled (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Schedule of Other Current Liabilities Other Current Liabilities [Table Text Block] General and administrative General and Administrative Expense Long-Lived Asset, Class [Domain] Long-Lived Asset, Class [Domain] Preferred stock, authorized (in shares) Preferred Stock, Shares Authorized Property, Plant, and Equipment [Table] Property, Plant, and Equipment [Table] Preferred stock, $0.01 par value; 10,000,000 shares authorized as of September 30, 2026 and December 31, 2025; zero shares issued and outstanding as of September 30, 2026 and December 31, 2025 Preferred Stock, Value, Issued Adjustment to Compensation: Adjustment to Compensation [Axis] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Statement of Cash Flows [Abstract] 2027 Contractual Obligation, to be Paid, Year One Short-term investments Debt Securities, Available-for-Sale, Excluding Accrued Interest, Current Schedule of Reserved Shares of Common Stock Schedule of Stock by Class [Table Text Block] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Name Measure Name Income Taxes Income Tax Disclosure [Text Block] Accounts payable Accounts Payable, Current Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Other, net Other Noncash Income (Expense) Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Additional Paid - In Capital Additional Paid-in Capital [Member] Entity Filer Category Entity Filer Category Board of Directors Director [Member] Name Trading Arrangement, Individual Name Total Obligations Contractual Obligation, Fiscal Year Maturity [Abstract] Cash and cash equivalents Cash and Cash Equivalent Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Company Selected Measure Amount Company Selected Measure Amount Investments, Debt and Equity Securities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Shares available for future grant under the ESPP Employee Stock Purchase Plan [Member] Employee Stock Purchase Plan Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Commercial paper Commercial Paper, Not Included with Cash and Cash Equivalents [Member] Current assets: Assets, Current [Abstract] Operating lease liabilities, weighted-average remaining lease term (in years) Operating Lease, Weighted Average Remaining Lease Term Non-PEO NEO Non-PEO NEO [Member] Entity Address, Address Line One Entity Address, Address Line One Recording of right of use asset Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 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 Provision for income taxes Provision for income taxes Income Tax Expense (Benefit) Cost of revenue Cost of Product and Service Sold Total Purchase Obligation Award Timing Method Award Timing Method [Text Block] Net decrease in cash, cash equivalents, and restricted cash Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] 2028 Lessor, Operating Lease, Payment to be Received, Year Two Net loss Net loss Net Income (Loss) Attributable to Parent Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Statement [Table] Statement [Table] Vesting Tranche Two Share-Based Payment Arrangement, Tranche Two [Member] Remaining maturity date greater than one year Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated And Single Maturity Date, After Year One Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated And Single Maturity Date, After Year One Restatement Determination Date: Restatement Determination Date [Axis] Proceeds from exercise of stock options Proceeds from Stock Options Exercised Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] Interest income Investment Income, Interest Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Total lease expense Lease Cost, Excluding Sublease Income Lease Cost, Excluding Sublease Income Basis of Presentation and Summary of Significant Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Numerator: Net Income (Loss) Available to Common Stockholders, Diluted [Abstract]