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[Abstract] Purchase obligation Purchase Obligation Credit Facility [Axis] Credit Facility [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Net cash (used in) provided by investing activities Net Cash Provided by (Used in) Investing Activities Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Issuance of common stock under employee stock purchase plan Stock Issued During Period, Value, Employee Stock Purchase Plan Unrealized (losses) gains on available-for-sale securities 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] Weighted average grant date fair value, vested (in usd 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] Consolidations Consolidation, Policy [Policy Text Block] Expected term (in years) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Total current liabilities Liabilities, Current Employee stock purchase plan Shares to be issued under the 2018 ESPP Employee Stock [Member] Operating leases Lessee, Operating Lease, Description [Abstract] Credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Money market funds Money Market Funds [Member] Supranational bonds Supranational Bonds [Member] Supranational Bonds Entity Address, Postal Zip Code Entity Address, Postal Zip Code Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Vesting of restricted stock units Stock Issued During Period, Value, Restricted Stock Unit Aggregate value of stock related to restricted stock units vesting during the period Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Title of 12(b) Security Title of 12(b) Security Schedule of assets measured at fair value on recurring basis Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Statement [Table] Statement [Table] Recently Adopted Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Unrecognized stock-based compensation expense Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Perpetual license and maintenance revenue License and Maintenance [Member] Statistical Measurement [Axis] Statistical Measurement [Axis] Subsequent Event Subsequent Event [Member] Cover [Abstract] Cover [Abstract] Total Finite-Lived Intangible Assets, Net Goodwill Beginning balance Ending balance Goodwill Cost of revenue Cost of Sales [Member] Schedule of goodwill Schedule of Goodwill [Table Text Block] Adjustments to reconcile net loss to net cash provided by 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] Subscription revenue Subscription and Circulation [Member] Right-of-use assets under finance leases Finance Lease, Right-of-Use Asset, before Accumulated Amortization Estimated fair value, due within one year Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Operating lease cost Operating Lease, Cost Computer software and equipment Computer Equipment [Member] Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Deferred commissions Capitalized Contract Cost, Net, Current Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Deferred tax benefit Deferred Income Tax Expense (Benefit) ESPP valuation assumptions Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions [Table Text Block]