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402(v) Disclosure Additional 402(v) Disclosure [Text Block] Plan Name [Axis] Plan Name [Axis] Tabular List, Table Tabular List [Table Text Block] 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, 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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 Settlement of liability-classified restricted stock units Settlement of Liability-Classified Restricted Stock Units [Member] Settlement of Liability-Classified Restricted Stock Units Software development costs Payments to Develop Software Pre-tax intrinsic value of options exercised Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Pre Tax Intrinsic Value Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period, Pre Tax Intrinsic Value 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 Matching Plan shares Matching Plan [Member] Matching Plan 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 Matching Plan 1/20th Share Issuance Matching Plan One Twentieth Issuance [Member] Matching Plan One Twentieth Issuance Company Selected Measure Amount Company Selected Measure Amount Depreciation and amortization Depreciation, Depletion and Amortization Stock, Class of Stock [Table] Stock, Class of Stock [Table] Classification of Award [Axis] Classification of Award [Axis] Classification of Award Non-PEO NEO Non-PEO NEO [Member] Entity Address, Street Entity Address, Address Line One Right-of-use assets acquired with operating lease liabilities 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) 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] Putative Class Action Putative Class Action [Member] Putative Class Action 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] Investment income, interest Investment Income, Interest Issuance of restricted stock units Stock Issued During Period, Value, Restricted Stock Award, Gross The 2009 Option Plan The 2009 Option Plan [Member] The 2009 Option Plan Weighted-average stock options Share-Based Payment Arrangement [Member] Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block]