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Description and Accounting Policies [Text Block] Expected life (in years) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Total current liabilities Liabilities, Current Cash payment in acquisition Payments to Acquire Businesses, Gross Payments to Acquire Businesses, Gross Net carrying amount Debt Instrument, Convertible, Carrying Amount Of Equity Component, Net Of Issuance Costs Debt Instrument, Convertible, Carrying Amount Of Equity Component, Net Of Issuance Costs Contingent earn-out Contingent Earn-Out [Member] Contingent Earn-Out [Member] Operating cash flows for finance leases Finance Lease, Interest Payment on Liability Money market funds Money Market Funds [Member] Foreign exchange adjustments Goodwill, Foreign Currency Translation Gain (Loss) Cash Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents Employer matching contribution percent of eligible compensation Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block] Options outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Amortization of purchased intangibles Amortization of Intangible Assets, Nonproduction Amortization of Intangible Assets, Nonproduction Current Fiscal Year End Date Current Fiscal Year End Date Sales commissions Accrued Sales Commission, Current Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Statement [Table] Statement [Table] Equity component of convertible senior notes Debt Conversion Options Issued During Period Debt Conversion Options Issued During Period Advertising costs Advertising Expense Recently Issued Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Weighted average assumptions Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Carrying Amount of Liability Component: Long-term Debt, Unclassified [Abstract] Unrecognized compensation cost related to nonvested share-based compensation arrangements Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Statistical Measurement [Axis] Statistical Measurement [Axis] Accounts Receivable Accounts Receivable [Policy Text Block] Subsequent Event Subsequent Event [Member] Finance lease liability Finance Lease, Liability, Noncurrent Total Finite-Lived Intangible Assets, Net Goodwill (Note 5) Beginning Balance Ending Balance Goodwill Goodwill Foreign taxes Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent Cost of revenue Cost of Sales [Member] Current income taxes, Foreign Current Foreign Tax Expense (Benefit) Schedule of Changes in 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] Finance lease right-of-use assets Finance Lease, Right-of-Use Asset, before Accumulated Amortization Operating lease cost Operating Lease, Cost Unamortized discount Debt Instrument, Unamortized Discount Total deferred income taxes Deferred Income Tax Expense (Benefit) Business Acquisition, Equity Interest Issued or Issuable, Description Business Acquisition, Equity Interest Issued or Issuable, Description Options vested and expected to vest Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Schedule of Receivables, Contract Acquisition Costs, and Deferred Revenue Schedule Of Receivables, Contract Acquisition Costs, And Deferred Revenue [Table Text Block] Schedule Of Receivables, Contract Acquisition Costs, And Deferred Revenue [Table Text Block] Accounting Standards Update 2016-13 [Member]