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Gross Carrying Amount Finite-Lived Intangible Assets, Gross Number of shares reserved for future issuance (in shares) Common Stock, Capital Shares Reserved for Future Issuance Leases [Abstract] Leases [Abstract] Entity Central Index Key Entity Central Index Key Schedule of Carrying Value of Intangible Assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Restricted Cash (Current & Non-Current) Restricted Cash [Member] Restricted Cash [Member] Finite-lived intangible assets, remaining amortization period Finite-Lived Intangible Assets, Remaining Amortization Period Amortization of capitalized internal-use software costs Capitalized Computer Software, Amortization Security Exchange Name Security Exchange Name Schedule of Nonvested Performance-based Units Activity Schedule of Nonvested Performance-based Units Activity [Table Text Block] Salary and Bonus Stock Program Salary and Bonus Stock Program [Member] Salary and Bonus Stock Program Cash and cash equivalents, fair value 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Current Fiscal Year End Date Current Fiscal Year End Date Schedule of Stock Option Activity Share-based Payment Arrangement, Option, Activity [Table Text Block] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Other comprehensive loss, net of tax Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent [Abstract] Option Indexed to Issuer's Equity, Type [Axis] Option Indexed to Issuer's Equity, Type [Axis] Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Changes in assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Unrealized (loss) gain on investments in securities Unrealized investment (loss) gain Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Vested and released (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 General and administrative General and Administrative Expense [Member] Expected terms (in years) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Total current liabilities Liabilities, Current Employee Stock Employee Stock [Member] Tax-related withholding of common stock Payment, Tax Withholding, Share-based Payment Arrangement Payments to acquire businesses Payments to Acquire Businesses, Gross Foreign currency translation adjustments Goodwill, Foreign Currency Translation Gain (Loss) Money market funds Money Market Funds [Member] Loss Contingencies [Table] Loss Contingencies [Table] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Vested and expected to vest at December 31, 2021, Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Entity Address, Postal Zip Code Entity Address, Postal Zip Code Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Title of 12(b) Security Title of 12(b) Security Schedule of Fair Value Measurements Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Proceeds from issuance of common stock under employee stock plans Proceeds from Stock Plans Statement [Table] Statement [Table] Other current assets Other Assets, Current Recently Adopted Accounting Pronouncements, Recent Accounting Pronouncements Not Yet Adopted New Accounting Pronouncements, Policy [Policy Text Block] Unrecognized compensation cost Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Statistical Measurement [Axis] Statistical Measurement [Axis] Capitalized internal-use software costs Payments for Software Subsequent Event Subsequent Event [Member] Cover [Abstract] Cover [Abstract] Net Carrying Amount Finite-Lived Intangible Assets, Net Goodwill Goodwill, beginning balance Goodwill, ending balance Goodwill Cost of Sales Cost of Sales [Member] Accrued taxes Accrued Income Taxes, Current Liabilities Operating Lease, Lease Liability, Lessee [Abstract] Operating Lease, Lease Liability, Lessee [Abstract] Schedule of Goodwill Schedule of Goodwill [Table Text Block] Adjustments to reconcile net loss to net cash provided by (used in) operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Operating lease expense Operating Lease, Cost Unamortized debt discount Debt Instrument, Unamortized Discount Deferred sales commission costs, current Capitalized Contract Cost, Net, Current Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Vested and expected to vest at December 31, 2021 (in years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term