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Granted and Vested in Covered Year [Member] GENERAL INFORMATION Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Debt Instrument [Axis] Debt Instrument [Axis] Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Purchase price as a percentage of common stock (percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Purchase Price of Common Stock, Percent Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Basic (in dollars per share) Net loss per share, basic (in dollars per share) Earnings Per Share, Basic Proceeds from insurance policy Proceeds from Insurance Settlement, Operating Activities Cashback rewards Contract with Customer, Liability, Current Repurchase and retirement 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] Cost of revenue, net Cost of Revenue Award Type [Axis] Award Type [Axis] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Settlement liabilities Increase (Decrease) in Settlement Liabilities Increase (Decrease) in Settlement Liabilities Accumulated deficit Retained Earnings (Accumulated Deficit) Product and Service [Axis] Product and Service [Axis] Conversion of stock, notice period (in months) Conversion of Stock, Notice Period Conversion of Stock, Notice Period Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common stock Common Stock [Member] Expected volatility (percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Cover [Abstract] Expected dividend yield (percent) Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate All other locations Non-US [Member] Equity Awards Adjustments Equity Awards Adjustments [Member] Total liabilities and stockholders' equity Liabilities and Equity Stock options Share-Based Payment Arrangement, Option [Member] Other liabilities Increase (Decrease) in Other Operating Liabilities Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Plan Name [Axis] Plan Name [Axis] Tabular List, Table Tabular List [Table Text Block] Restricted cash included in settlement assets, net Restricted Cash Included In Settlement Assets Restricted Cash Included In Settlement Assets Additional paid-in capital Additional Paid in Capital Schedule of Accrued Expenses and Other Liabilities Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Income tax receivable Income Taxes Receivable, Current Name Awards Close in Time to MNPI Disclosures, Individual Name Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Cancelled/forfeited/expired (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period General and administrative General and Administrative Expense Long-Lived Asset, Class [Domain] Long-Lived Asset, Class [Domain] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Schedule of Other Current Assets Schedule Of Other Current Assets [Line Items] Schedule Of Other Current Assets [Line Items] Property, Plant, and Equipment [Table] Property, Plant, and Equipment [Table] Preferred Stock, Value, Issued Preferred Stock, Value, Issued Adjustment to Compensation: Adjustment to Compensation [Axis] Fees and expenses Stock Repurchase Program Fees And Expenses Stock Repurchase Program Fees And Expenses Share Repurchase Program [Axis] Share Repurchase Program [Axis] Common Stock, LT50 LT50 Common Stock Common Stock, LT50 [Member] Common Stock, LT50 Class of Stock [Domain] Class of Stock [Domain] Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Statement of Cash Flows [Abstract] Stock issued during period, shares, employee stock ownership plan (in shares) Stock Issued During Period, Shares, Employee Stock Ownership Plan Credit Facility [Axis] Credit Facility [Axis] 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] Issuance of common stock under the Matching Plan (in shares) Stock Issued During Period, Shares, Employee Benefit Plan Other current assets Increase (Decrease) in Other Current Assets Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Additional paid-in capital Additional Paid-in Capital [Member] Settlement liabilities Settlement Liabilities, Current Entity Filer Category Entity Filer Category Software development costs Payments to Develop Software Revision of Prior Period [Axis] Revision of Prior Period [Axis] Name Trading Arrangement, Individual Name Cash and cash equivalents Cash and cash equivalents Cash and Cash Equivalent Schedule of Stock Option Roll-forward Schedule of Stock Options Roll Forward [Table Text Block] Granted options (in shares) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Net of Forfeitures Company Selected Measure Amount Company Selected Measure Amount Matching Plan shares Matching Plan [Member] Matching Plan Depreciation and amortization Depreciation, Depletion and Amortization Stock, Class of Stock [Table] Stock, Class of Stock [Table] Non-PEO NEO Non-PEO NEO [Member] Entity Address, Street Entity Address, Address Line One 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) benefit from income taxes Provision for income taxes Income Tax Expense (Benefit) Repurchases and retirement of common stock in accounts payable and accrued expenses Repurchases And Retirement Of Common Stock In Accounts Payable And Accrued Expenses Repurchases And Retirement Of Common Stock In Accounts Payable And Accrued Expenses Employer share match rate (percent) Share-Based Compensation Arrangement By Share-Based Payment Award, Percentage Of Shares Matched By Employer Share-Based Compensation Arrangement By Share-Based Payment Award, Percentage Of Shares Matched By Employer Award Timing Method Award Timing Method [Text Block] Other Product and Service, Other [Member] Net increase in cash and 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] Net loss Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Statement [Table] Statement [Table] Restatement Determination Date: Restatement Determination Date [Axis] Proceeds from issuance of common stock upon 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] Lease liabilities, non-current Lease Liability, Non-Current Lease Liability, Non-Current Investment income, interest Investment Income, Interest Issuance of restricted stock units Stock Issued During Period, Value, Restricted Stock Award, Gross Weighted-average stock options Share-Based Payment Arrangement [Member] The 2009 Option Plan The 2009 Option Plan [Member] The 2009 Option Plan Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]