Income Tax Disclosure [Abstract] Operating Loss Carryforwards [Table] Operating Loss Carryforwards [Table] Sale of Stock [Axis] Sale of Stock [Axis] Sale of Stock [Domain] Sale of Stock [Domain] IPO IPO [Member] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Accounting Standards Update 2016-02 Accounting Standards Update 2016-02 [Member] Accounting Standards Update 2014-09 Accounting Standards Update 2014-09 [Member] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] Federal Domestic Tax Authority [Member] State State and Local Jurisdiction [Member] Foreign Foreign Tax Authority [Member] Operating Loss Carryforwards [Line Items] Operating Loss Carryforwards [Line Items] Net operating loss carryforwards Operating Loss Carryforwards Tax credits carryforwards Tax Credit Carryforward, Amount Deferred tax asset, operating lease liability Deferred Tax Asset, Leasing Arrangements Deferred Tax Asset, Leasing Arrangements Deferred tax liability, operating lease right-of-use asset Deferred Tax Liabilities, Leasing Arrangements Valuation allowance Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount Deferred tax assets, deferred revenue Deferred Tax Assets, Deferred Income Deferred tax liabilities, capitalizing commission and fringe benefits Deferred Tax Liabilities, Deferred Expense Unrecognized tax benefits Unrecognized Tax Benefits Effective tax rate impact Unrecognized Tax Benefits, Change In Tax Expense (Benefit) If Recognized Unrecognized Tax Benefits, Change In Tax Expense (Benefit) If Recognized Reduction to deferred tax assets Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Deferred Tax Asset Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Deferred Tax Asset One-time deemed repatriation income Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Transition Tax For Accumulated Foreign Earnings, Provisional Income Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Transition Tax For Accumulated Foreign Earnings, Provisional Income Organization, Consolidation and Presentation of Financial Statements [Abstract] Capitalized Contract Cost [Roll Forward] Capitalized Contract Cost [Roll Forward] Capitalized Contract Cost [Roll Forward] Beginning balance Capitalized Contract Cost, Net Capitalization of contract acquisition costs Capitalized Contract Cost, Increase From Capitalization Of Costs Capitalized Contract Cost, Increase From Capitalization Of Costs Amortization of deferred contract acquisition costs Capitalized Contract Cost, Amortization Ending balance Segment Reporting [Abstract] Number of operating segments Number of Operating Segments Concentration Risk [Table] Concentration Risk [Table] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] United States UNITED STATES Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Revenue Sales Revenue, Net [Member] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Geographic concentration risk Geographic Concentration Risk [Member] Concentration Risk [Line Items] Concentration Risk [Line Items] Concentration risk, percentage Concentration Risk, Percentage Advertising costs incurred Advertising Expense Capitalized development costs of internal use software Capitalized Computer Software, Additions Document And Entity Information [Abstract] Document And Entity Information [Abstract] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding (in shares) Entity Common Stock, Shares Outstanding Entity Emerging Growth Company Entity Emerging Growth Company Entity Small Business Entity Small Business Entity Ex Transition Period Entity Ex Transition Period Entity Shell Company Entity Shell Company Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Public Float Entity Public Float Retirement Benefits [Abstract] Contribution expense Defined Contribution Plan, Cost Schedule of Revenues from External Customers and Long-Lived Assets [Table] Schedule of Revenues from External Customers and Long-Lived Assets [Table] International Non-US [Member] Revenues from External Customers and Long-Lived Assets [Line Items] Revenues from External Customers and Long-Lived Assets [Line Items] Property and equipment, net Property, Plant and Equipment, Net Income Statement [Abstract] Revenue Revenue from Contract with Customer, Excluding Assessed Tax Cost of revenue Cost of Revenue Gross profit Gross Profit Operating expenses: Operating Expenses [Abstract] Sales and marketing Selling and Marketing Expense Research and development Research and Development Expense General and administrative General and Administrative Expense Total operating expenses Operating Expenses Loss from operations Operating Income (Loss) Other income (expense), net Nonoperating Income (Expense) Total loss before income taxes Income (Loss) Attributable to Parent, before Tax Provision for income taxes Income Tax Expense (Benefit) Net loss Net Income (Loss) Attributable to Parent Comprehensive Loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent Accretion of Series A and B redeemable convertible preferred stock Temporary Equity, Accretion to Redemption Value, Adjustment Net loss attributable to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Net loss per share attributable to common stockholders, basic and diluted (in usd per share) Earnings Per Share, Basic and Diluted Weighted-average shares used to compute net loss per share attributable to common stockholders, basic and diluted (in shares) Weighted Average Number of Shares Outstanding, Basic and Diluted Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Subscription revenue License [Member] Perpetual license and maintenance revenue License and Maintenance [Member] Professional services and other revenue Service, Other [Member] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Revenue Earnings Per Share [Abstract] Net Loss Per Share Attributable to Common Stockholders Earnings Per Share [Text Block] Restricted Cash Restricted Cash and Cash Equivalents, Current Statement of Financial Position [Abstract] Statement [Table] Statement [Table] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Series A Redeemable Convertible Preferred Stock Series A Redeemable Convertible Preferred Stock [Member] Series A Redeemable Convertible Preferred Stock [Member] Series B Redeemable Convertible Preferred Stock Series B Redeemable Convertible Preferred Stock [Member] Series B Redeemable Convertible Preferred Stock [Member] Statement [Line Items] Statement [Line Items] Assets Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Short-term investments Short-term Investments Accounts receivable (net of allowance for doubtful accounts of $188 and $160 at December 31, 2018 and 2017, respectively) Accounts Receivable, Net, Current Deferred commissions Capitalized Contract Cost, Net, Current Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Total current assets Assets, Current Construction in progress Construction in Progress, Gross Deferred commissions (net of current portion) Capitalized Contract Cost, Net, Noncurrent Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Other assets Other Assets, Noncurrent Total assets Assets Liabilities, Redeemable Convertible Preferred Stock and Stockholders’ Equity (Deficit) Liabilities and Equity [Abstract] Current liabilities: Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Accrued expenses Accrued Liabilities, Current Accrued compensation Employee-related Liabilities, Current Deferred revenue Contract with Customer, Liability, Current Operating lease liabilities Operating Lease, Liability, Current Other current liabilities Other Liabilities, Current Total current liabilities Liabilities, Current Deferred revenue (net of current portion) Contract with Customer, Liability, Noncurrent Operating lease liabilities (net of current portion) Operating Lease, Liability, Noncurrent Financing obligation Long-term Construction Loan, Noncurrent Other liabilities Other Liabilities, Noncurrent Total liabilities Liabilities Redeemable convertible preferred stock Temporary Equity, Carrying Amount, Attributable to Parent Stockholders’ equity (deficit): Stockholders' Equity Attributable to Parent [Abstract] Common stock (par value: $0.01; 500,000 and 93,855 shares authorized, 93,126 and 24,472 shares issued and outstanding at December 31, 2018 and 2017, respectively) Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Accumulated deficit Retained Earnings (Accumulated Deficit) Total stockholders’ equity (deficit) Stockholders' Equity Attributable to Parent Total liabilities, redeemable convertible preferred stock and stockholders’ equity (deficit) Liabilities and Equity U.S. income (loss) Income (Loss) from Continuing Operations before Income Taxes, Domestic Foreign (loss) income Income (Loss) from Continuing Operations before Income Taxes, Foreign Leases [Abstract] Leases Lessee, Operating Leases [Text Block] Basis of Presentation Basis of Accounting [Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Foreign Currency Foreign Currency Transactions and Translations Policy [Policy Text Block] Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Fair Value of Financial Instruments Fair Value Measurement, Policy [Policy Text Block] Investments Investment, Policy [Policy Text Block] Accounts Receivable Trade and Other Accounts Receivable, Policy [Policy Text Block] Property and Equipment, net Property, Plant and Equipment, Policy [Policy Text Block] Leases Lessee, Leases [Policy Text Block] Impairment of Long-Lived Assets Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Business Combinations Business Combinations Policy [Policy Text Block] Advertising Advertising Costs, Policy [Policy Text Block] Software Development Costs Research, Development, and Computer Software, Policy [Policy Text Block] Stock-Based Compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Net Loss per Share Earnings Per Share, Policy [Policy Text Block] Segment Information Segment Reporting, Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Recently Issued Accounting Pronouncements Not Yet Adopted New Accounting Pronouncements, Policy [Policy Text Block] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Purchased technology Technology-Based Intangible Assets [Member] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Intangible assets Intangible Assets, Gross (Excluding Goodwill) Amortization period Finite-Lived Intangible Asset, Useful Life Accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Amortization of intangible assets Amortization of Intangible Assets Estimated future amortization of intangible assets Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Cost of revenue Cost of Sales [Member] Sales and marketing Selling and Marketing Expense [Member] Research and development Research and Development Expense [Member] General and administrative General and Administrative Expense [Member] Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] Stock-based compensation expense Allocated Share-based Compensation Expense Americas Americas [Member] Europe, Middle East and Africa EMEA [Member] Asia Pacific Asia Pacific [Member] Current Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Current Federal Tax Expense (Benefit) State Current State and Local Tax Expense (Benefit) Foreign Current Foreign Tax Expense (Benefit) Total current tax expense Current Income Tax Expense (Benefit) Deferred Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Foreign Deferred Foreign Income Tax Expense (Benefit) Total deferred tax expense (benefit) Deferred Income Tax Expense (Benefit) Total provision for income taxes Debt Disclosure [Abstract] Line of Credit Facility [Table] Line of Credit Facility [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Line of Credit Line of Credit [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] LIBOR London Interbank Offered Rate (LIBOR) [Member] Prime Rate Base Rate [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Revolving credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Arrears paid on average unused portion Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Outstanding balance of credit facility, amount requiring covenant compliance Line Of Credit Facility, Amount Outstanding Requiring Covenant Compliance Line Of Credit Facility, Amount Outstanding at End of Period Requiring Covenant Compliance Borrowings against debt instrument Proceeds from Lines of Credit Cash paid for amounts included in the measurement of lease liabilities: Cash Flow, Operating Activities, Lessee [Abstract] Operating cash flows from operating leases Operating Lease, Payments Operating cash flows from finance leases Finance Lease, Interest Payment on Liability Financing cash flows from finance leases Finance Lease, Principal Payments ROU assets obtained in exchange for lease obligations: Lease, Cost [Abstract] Operating leases Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Finance leases Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Quarterly Financial Information Disclosure [Abstract] Quarterly Results (unaudited) Quarterly Financial Information [Text Block] Stockholders' Equity Note [Abstract] Redeemable Convertible Preferred Stock and Common Stock Stockholders' Equity Note Disclosure [Text Block] Business Combination, Separately Recognized Transactions [Table] Business Combination, Separately Recognized Transactions [Table] Business Combination, Separately Recognized Transactions [Line Items] Business Combination, Separately Recognized Transactions [Line Items] Purchase consideration Payments to Acquire Businesses, Gross Purchase consideration including technology Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Goodwill Goodwill, Acquired During Period Components of leases Lease, Cost [Table Text Block] Supplemental cash flow information related to leases Lease, Supplemental Cash Flow Information [Table Text Block] Lease, Supplemental Cash Flow Information [Table Text Block] Schedule of maturities of operating lease liabilities Lessee, Operating Lease, Liability, Maturity [Table Text Block] Revenue, Initial Application Period Cumulative Effect Transition [Table] Revenue, Initial Application Period Cumulative Effect Transition [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Accumulated Deficit Retained Earnings [Member] Revenue, Initial Application Period Cumulative Effect Transition [Line Items] Revenue, Initial Application Period Cumulative Effect Transition [Line Items] Cumulative effect of adoptions of new accounting standards Cumulative Effect of New Accounting Principle in Period of Adoption Increase to deferred revenue Increase (Decrease) in Contract with Customer, Liability Increase to capitalized contract costs Capitalized Contract Cost, Gross Net increase to revenue Effect of Adoption of New Accounting Principle, net of revenue recognized from contract with customer liability Effect of Adoption of New Accounting Principle, net of revenue recognized from contract with customer liability Revenue recognized that was included in deferred revenue Contract with Customer, Liability, Revenue Recognized Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Restricted shares Restricted Stock [Member] Restricted stock units Restricted Stock Units (RSUs) [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Number of shares unvested, beginning of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Number of shares, granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Number of shares, vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Number of shares, forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Number of shares unvested, end of period (in shares) Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Weighted average grant date fair value, beginning of period (in USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Weighted average grant date fair value, granted (in USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value 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 Weighted average grant date fair value, forfeited (in USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Weighted average grant date fair value, end of period (in USD per share) Income Taxes Income Tax Disclosure [Text Block] Statement of Cash Flows [Abstract] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Net loss Adjustments to reconcile net loss to net cash used in operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Stock-based compensation Share-based Compensation Other Other Noncash Income (Expense) Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable Increase (Decrease) in Accounts Receivable Prepaid expenses and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Deferred commissions Increase (Decrease) In Capitalized Contract Costs Increase (Decrease) In Capitalized Contract Costs Other assets Increase (Decrease) in Other Operating Assets Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Accrued compensation Increase (Decrease) in Employee Related Liabilities Deferred revenue Other current liabilities Increase (Decrease) in Other Current Liabilities Other liabilities Increase (Decrease) in Other Operating Liabilities Net cash used in operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Purchases of short-term investments Payments to Acquire Investments Business combination Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds from initial public offering, net of underwriting discounts and commissions Proceeds from Issuance Initial Public Offering Payments of costs related to initial public offering Payments of Stock Issuance Costs Principal payments under finance lease obligations Proceeds from grant agreement Proceed From Grants Proceed From Grants Credit facility issuance costs Payments of Debt Issuance Costs Proceeds from the exercise of stock options Proceeds from Stock Options Exercised Repurchases of common stock Payments for Repurchase of Common Stock Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Effect of exchange rate changes on cash and cash equivalents and restricted cash Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Net increase (decrease) in cash and cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash and cash equivalents and restricted cash at beginning of year Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash and cash equivalents and restricted cash at end of year Supplemental disclosure of cash flow information: Supplemental Cash Flow Information [Abstract] Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activities Cash paid for income taxes Income Taxes Paid Supplemental disclosure of non-cash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Assets acquired under finance leases Capital Lease Obligations Incurred Asset retirement obligations Settlement of Asset Retirement Obligations Through Noncash Payments, Amount Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Computer software and equipment Computer Equipment [Member] Furniture and fixtures Furniture and Fixtures [Member] Leasehold improvements Leaseholds and Leasehold Improvements [Member] Right-of-use assets under finance leases Right-Of-Use Assets Under Finance Lease [Member] Right-Of-Use Assets Under Finance Lease [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Total Property, Plant and Equipment, Gross Less: accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Property and equipment, net Quarterly Results (unaudited) Quarterly Financial Information [Table Text Block] Capitalized Contract Cost [Table] Capitalized Contract Cost [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Capitalized Contract Cost [Line Items] Capitalized Contract Cost [Line Items] Estimated period of benefit Capitalized Contract Cost, Amortization Period Debt Debt Disclosure [Text Block] Fair Value Disclosures [Abstract] Schedule of assets measured at fair value on recurring basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Operating lease cost Operating Lease, Cost Finance lease cost: Finance Lease, Cost [Abstract] Amortization of ROU assets Finance Lease, Right-of-Use Asset, Amortization Interest on lease liabilities Finance Lease, Interest Expense Total finance lease cost Lease, Cost Stock options Employee Stock Option [Member] Expected term (in years) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Expected volatility, minimum Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum Expected volatility, maximum Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum Risk - free interest rate, minimum Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum Risk - free interest rate, maximum Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum Expected dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Expected forfeiture rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Forfeiture Rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Forfeiture Rate Schedule of Components of Loss Before Income Taxes Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] Schedule of Components of the Provision for Income Taxes Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Components of Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Schedule Change of Gross Unrealized Tax Benefits Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] Deferred tax assets: Deferred Tax Assets, Net [Abstract] Net operating loss Deferred Tax Assets, Operating Loss Carryforwards Deferred revenue Stock-based compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Tax credits Deferred Tax Assets, Tax Credit Carryforwards Leases Deferred Tax Assets, Leases Deferred Tax Assets, Leases Accrued compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation Other Deferred Tax Assets, Other Total deferred tax assets Deferred Tax Assets, Gross Valuation allowance Deferred Tax Assets, Valuation Allowance Net deferred tax assets Deferred Tax Assets, Net of Valuation Allowance Deferred tax liabilities: Deferred Tax Liabilities, Gross [Abstract] Deferred commissions Property and equipment Deferred Tax Liabilities, Property, Plant and Equipment Intangible assets Deferred Tax Liabilities, Intangible Assets Other Deferred Tax Liabilities, Other Total deferred tax liabilities Deferred Tax Liabilities, Gross Net deferred tax liabilities Deferred Tax Liabilities, Net Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Operating leases Leases, Operating [Abstract] Operating lease liabilities (current) Total operating lease liabilities Operating Lease, Liability Weighted average remaining lease term Operating Lease, Weighted Average Remaining Lease Term Weighted average discount rate Operating Lease, Weighted Average Discount Rate, Percent Finance leases Property and equipment Accumulated depreciation Other current liabilities Finance Lease, Liability, Current Other liabilities Finance Lease, Liability, Noncurrent Total finance lease liabilities Finance Lease, Liability Computation of basic and diluted net loss per share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Potentially dilutive securities Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Fair Value Measurements Fair Value Disclosures [Text Block] Business and Summary of Significant Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Stock-based awards Stock Compensation Plan [Member] Employee stock purchase plan Employee Stock [Member] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] 2018 Equity Incentive Plan Equity Incentive Plan 2018 [Member] Equity Incentive Plan 2018 [Member] Stock options, stock incentive plans, maximum term Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Stock options, stock incentive plan, vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Common stock reserved for issuance (in shares) Common Stock, Capital Shares Reserved for Future Issuance Percentage of shares outstanding Common Stock, Capital Shares Reserved For Future Issuance, Annual Increase, Percentage Common Stock, Capital Shares Reserved For Future Issuance, Annual Increase, Percentage Shares of common stock outstanding (in shares) Common Stock, Capital Shares Reserved For Future Issuance, Annual Increase Common Stock, Capital Shares Reserved For Future Issuance, Annual Increase Shares available for grant (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Unrecognized stock-based compensation expense, outstanding stock options Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options Estimated remaining weighted average period Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Unrecognized stock-based compensation expense, unvested restricted stock or RSUs Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options Stock options vested and expected to vest (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Weighted average grant date fair value (in USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Intrinsic Value Benefit Plans Pension and Other Postretirement Benefits Disclosure [Text Block] Percentage of employee earnings allowed Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate Discount price percentage Share-based Compensation Arrangement By Share-based Payment Award, Discount Of Fair Market Value, Offering Date Or Purchase Date Share-based Compensation Arrangement By Share-based Payment Award, Discount Of Fair Market Value, Offering Date Or Purchase Date Offering period (up to) Share-based Compensation Arrangement by Share-based Payment Award, Offering Period Share-based Compensation Arrangement by Share-based Payment Award, Offering Period Employee contributions Employee-related Liabilities Common stock purchased (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Unrecognized stock-based compensation expense Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Remaining offering period Geographic Information Segment Reporting Disclosure [Text Block] U.S. federal statutory tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent State and local taxes Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Research and development tax credit Effective Income Tax Rate Reconciliation, Tax Credit, Research, Percent Uncertain tax positions Effective Income Tax Rate Reconciliation, Tax Contingency, Percent Foreign tax rate differential Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent Transition tax Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Transition Tax, Percent Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Transition Tax, Percent Revaluation of U.S. deferred income taxes Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent Change in valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Other Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Effective tax rate Effective Income Tax Rate Reconciliation, Percent Schedule of Product Information [Table] Schedule of Product Information [Table] Customer [Axis] Customer [Axis] Customer [Domain] Customer [Domain] One distributor One Distributor [Member] One Distributor [Member] Accounts receivable Accounts Receivable [Member] Sales method risk Sales Method Risk [Member] Sales Method Risk Customer concentration risk Customer Concentration Risk [Member] Depreciation and amortization Depreciation and Amortization, Property and Equipment Depreciation and amortization related to property and equipment 2019 Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months 2020 Lessee, Operating Lease, Liability, Payments, Due Year Two 2021 Lessee, Operating Lease, Liability, Payments, Due Year Three 2022 Lessee, Operating Lease, Liability, Payments, Due Year Four 2023 Lessee, Operating Lease, Liability, Payments, Due Year Five Thereafter Lessee, Operating Lease, Liability, Payments, Due after Year Five Total lease payments Lessee, Operating Lease, Liability, Payments, Due Less imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Accounts receivable, allowance for doubtful accounts Allowance for Doubtful Accounts Receivable, Current Redeemable convertible preferred stock, par value (in usd per share) Temporary Equity, Par or Stated Value Per Share Redeemable convertible preferred stock, shares authorized (in shares) Temporary Equity, Shares Authorized Redeemable convertible preferred stock, shares issued (in shares) Temporary Equity, Shares Issued Redeemable convertible preferred stock, shares outstanding (in shares) Temporary Equity, Shares Outstanding Redeemable convertible preferred stock, liquidation value Temporary Equity, Liquidation Preference Common stock, par value (in usd per share) Common Stock, Par or Stated Value Per Share Common stock, shares authorized (in shares) Common Stock, Shares Authorized Common stock, shares issued (in shares) Common Stock, Shares, Issued Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Requisite period Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Number of shares outstanding, beginning of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Number of shares, granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Number of shares, exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Number of shares, forfeited/canceled (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period Number of shares outstanding, end of period (in shares) Number of shares exercisable (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Weighted average exercise price, outstanding, beginning of period (in USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Weighted average exercise price, granted (in USD per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Weighted average exercise price, exercised (in USD per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Weighted average exercise price, forfeited/canceled (in USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Weighted average exercise price, outstanding, end of period (in USD per share) Weighted average exercise price, exercisable (in USD per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Weighted average remaining contractual term (in years), outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Weighted average remaining contractual term (in years), exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Aggregate intrinsic value, outstanding, beginning of period Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Aggregate intrinsic value, exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Aggregate intrinsic value, outstanding, end of period Aggregate intrinsic value, exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Common Stock Common Stock [Member] Class of Stock [Line Items] Class of Stock [Line Items] Stock sold (in shares) Sale of Stock, Number of Shares Issued in Transaction Redeemable convertible preferred stock, conversion ratio Stockholders Equity, Redeemable Convertible Stock, Conversion Ratio Stockholders Equity, Redeemable Convertible Stock, Conversion Ratio Issuance of common stock upon conversion of redeemable convertible preferred stock (in shares) Stock Issued During Period, Shares, Conversion of Convertible Securities Common stock, authorized (in shares) Preferred stock, authorized (in shares) Preferred Stock, Shares Authorized Preferred stock, issued (in shares) Preferred Stock, Shares Issued Preferred stock, outstanding (in shares) Preferred Stock, Shares Outstanding Foreign Currency Transaction Gain (Loss), before Tax Foreign Currency Transaction Gain (Loss), before Tax Subsidiary or Equity Method Investee, Sale of Stock by Subsidiary or Equity Investee [Table] Subsidiary or Equity Method Investee, Sale of Stock by Subsidiary or Equity Investee [Table] Redeemable convertible Series A preferred stock Preferred Class A [Member] Redeemable convertible Series B preferred stock Preferred Class B [Member] Over-allotment option Over-Allotment Option [Member] Subsidiary, Sale of Stock [Line Items] Subsidiary, Sale of Stock [Line Items] Stock sold, price per share (in usd per share) Sale of Stock, Price Per Share Net proceeds from sale of stock Sale of Stock, Consideration Received on Transaction Property and equipment, net Property, Plant and Equipment [Table Text Block] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] ESPP Redeemable convertible preferred stock Redeemable Convertible Preferred Stock [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive securities excluded from computation of earnings per share (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Revenue by region Revenue from External Customers by Geographic Areas [Table Text Block] Property and equipment, net by geographic area Long-lived Assets by Geographic Areas [Table Text Block] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Future estimated revenue Revenue, Remaining Performance Obligation, Amount Expected recognized percentage over succeeding 12 months Revenue, Remaining Performance Obligation, Percentage Expected timing of satisfaction Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Unrecognized tax benefits at the beginning of the period Additions for tax positions in the current year Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Increase in prior year positions Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Decrease in prior year positions Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Unrecognized tax benefits at the end of the period Schedule of Operating Leased Assets [Table] Schedule of Operating Leased Assets [Table] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Scenario, Forecast Scenario, Forecast [Member] Operating Leased Assets [Line Items] Operating Leased Assets [Line Items] Remaining terms of leases Lessee, Operating Lease, Term of Contract Lease renewal terms Lessee, Operating Lease, Renewal Term Option to terminate lease Lessee, Operating Lease, Options To Terminate Lessee, Operating Lease, Options To Terminate Obligations for operating lease Operating Leases, Future Minimum Payments Due Operating lease, rent expense Operating Leases, Rent Expense Obligations for capital lease Capital Lease Obligations Summary of revenue Disaggregation of Revenue [Table Text Block] Activity of deferred contract costs Capitalized Contract Cost [Table Text Block] Net loss attributable to common stockholders Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Money market funds Money Market Funds [Member] Financial Instruments [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Commercial paper Commercial Paper [Member] Corporate bonds Corporate Debt Securities [Member] U.S. Treasury and agency obligations US Treasury Securities [Member] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Level 1 Fair Value, Inputs, Level 1 [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Level 3 Fair Value, Inputs, Level 3 [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Short-term investments Debt Securities, Available-for-sale License and maintenance period License And Maintenance Period License And Maintenance Period Estimated maintenance renewal period Maintenance Renewal Period Maintenance Renewal Period Economic life of perpetual license contracts Property and Equipment, Net Property, Plant and Equipment Disclosure [Text Block] Stock-based compensation expense Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] Stock option activity Share-based Compensation, Stock Options, Activity [Table Text Block] Valuation assumptions Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Summary of restricted stock and restricted stock units Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Statement of Stockholders' Equity [Abstract] Additional Paid-in Capital Additional Paid-in Capital [Member] Redeemable Convertible Preferred Stock [Roll Forward] Increase (Decrease) in Temporary Equity [Roll Forward] Balance (in shares) Balance Accretion of Series A and B redeemable convertible preferred stock Temporary Equity, Accretion to Redemption Value Conversion of redeemable convertible preferred stock to common stock upon initial public offering (in shares) Temporary Equity, Shares, Conversion Temporary Equity, Shares, Conversion Conversion of redeemable convertible preferred stock to common stock upon initial public offering Temporary Equity, Value, Conversion Temporary Equity, Value, Conversion Balance (in shares) Balance Increase (Decrease) in Stockholders' Deficit [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance (in shares) Balance Accretion of Series A and B redeemable convertible preferred stock Adjustments to Additional Paid in Capital, Increase in Carrying Amount of Redeemable Preferred Stock Issuance of restricted stock award (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Gross Issuance of restricted stock award Stock Issued During Period, Value, Restricted Stock Award, Gross Exercise of stock options (in shares) Exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Repurchase of common stock (in shares) Stock Repurchased During Period, Shares Repurchase of common stock Stock Repurchased During Period, Value Stock-based compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Income tax benefit from stock options Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net Issuance of common stock in connection with initial public offering, net of underwriting discounts and commissions and other offering expenses (in shares) Stock Issued During Period, Shares, New Issues Issuance of common stock in connection with initial public offering, net of underwriting discounts and commissions and other offering expenses Stock Issued During Period, Value, New Issues Conversion of redeemable convertible preferred stock to common stock upon initial public offering (in shares) Conversion of redeemable convertible preferred stock to common stock upon initial public offering Stock Issued During Period, Value, Conversion of Convertible Securities Balance (in shares) Balance New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Deposit Security Deposit Operating lease liabilities