Segment Reporting [Abstract] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] Americas Americas [Member] Europe, Middle East and Africa EMEA [Member] Asia Pacific Asia Pacific [Member] Revenues from External Customers and Long-Lived Assets [Line Items] Revenues from External Customers and Long-Lived Assets [Line Items] Revenue Revenue from Contract with Customer, Excluding Assessed Tax Fair Value Disclosures [Abstract] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring Fair Value, Measurements, Recurring [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] 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] 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 Organization, Consolidation and Presentation of Financial Statements [Abstract] Summary of revenue Disaggregation of Revenue [Table Text Block] Activity of deferred contract costs Capitalized Contract Cost [Table Text Block] Future estimated revenue Revenue, Remaining Performance Obligation, Amount 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] 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 United States UNITED STATES International Non-US [Member] Property and equipment, net Property, Plant and Equipment, Net 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 Allocated Share-based Compensation Expense 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] Statement of Cash Flows [Abstract] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Net loss Net Income (Loss) Attributable to Parent 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 Deferred income taxes Deferred Income Tax Expense (Benefit) 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 Increase (Decrease) in Contract with Customer, Liability 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 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 capital lease obligations Repayments of Long-term Capital Lease Obligations 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 period Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash and cash equivalents and restricted cash at end of period 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 capital leases Capital Lease Obligations Incurred Asset retirement obligations Settlement of Asset Retirement Obligations Through Noncash Payments, Amount Construction in progress Construction in Progress Expenditures Incurred but Not yet Paid 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] Stock options Employee Stock Option [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] 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 Stock options, employees, vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Stock options granted, 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 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] Equipment under capital leases Assets Held under Capital Leases [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 Property and equipment, net Property, Plant and Equipment [Table Text Block] Depreciation and amortization Depreciation 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 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 Commitments and Contingencies Disclosure [Abstract] Schedule of Operating Leased Assets [Table] Schedule of Operating Leased Assets [Table] Computer and office equipment Office Equipment [Member] Building Building [Member] Operating Leased Assets [Line Items] Operating Leased Assets [Line Items] Initial term of contract Lessee, Operating Lease, Term of Contract Operating lease, rent expense Operating Leases, Rent Expense Obligations for capital lease Capital Lease Obligations Obligations for operating lease Operating Leases, Future Minimum Payments Due Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Perpetual license and maintenance revenue License and Maintenance [Member] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] 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 Finite-Lived Intangible Asset, Useful Life Temporary Equity Disclosure [Abstract] Redeemable Convertible Preferred Stock Temporary Equity Disclosure [Text Block] Temporary Equity Disclosure [Text Block] Debt Disclosure [Abstract] Debt Debt Disclosure [Text Block] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Earnings Per Share [Abstract] Net loss attributable to common stockholders Net Income (Loss) Available to Common Stockholders, Basic 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 Net loss per share attributable to common stockholders, basic and diluted (in usd per share) Earnings Per Share, Basic and Diluted Capitalized Contract Cost [Table] Capitalized Contract Cost [Table] Subscription revenue Subscription and Circulation [Member] Capitalized Contract Cost [Line Items] Capitalized Contract Cost [Line Items] Estimated period of benefit Capitalized Contract Cost, Amortization Period Business and Summary of Significant Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Geographic Information Segment Reporting Disclosure [Text Block] 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 Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] 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, outstanding, end of period Aggregate intrinsic value, exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Construction in progress Construction in Progress, Gross Financing obligation Long-term Construction Loan, Noncurrent Deposit Security Deposit 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 $196 and $160 at September 30, 2018 and December 31, 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 Deferred commissions (net of current portion) Capitalized Contract Cost, Net, Noncurrent Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Goodwill Goodwill 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 Other current liabilities Other Liabilities, Current Total current liabilities Liabilities, Current Deferred revenue (net of current portion) Contract with Customer, Liability, Noncurrent Other liabilities Other Liabilities, Noncurrent Total liabilities Liabilities Commitments and contingencies (Note 5) Commitments and Contingencies 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 at September 30, 2018 and December 31, 2017; 93,040 and 24,472 shares issued and outstanding at September 30, 2018 and December 31, 2017) 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 Statement of Stockholders' Equity [Abstract] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock Common Stock [Member] Additional Paid-in Capital Additional Paid-in Capital [Member] Accumulated Deficit Retained Earnings [Member] Redeemable Convertible Preferred Stock [Roll Forward] Increase (Decrease) in Temporary Equity [Roll Forward] Balance (in shares) Temporary Equity, Shares Outstanding 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) Common Stock, Shares, Outstanding 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 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 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) Stock Issued During Period, Shares, Conversion of Convertible Securities 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 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) 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) Minimum future non-cancelable payments for operating leases Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Minimum future non-cancelable payments for capital leases Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block] Income Statement [Abstract] 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) Loss before income taxes Income (Loss) Attributable to Parent, before Tax Provision for income taxes Income Tax Expense (Benefit) Net loss and comprehensive loss Accretion of Series A and B redeemable convertible preferred stock Temporary Equity, Accretion to Redemption Value, Adjustment Net loss attributable to common stockholders Stock-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Net Loss Per Share Attributable to Common Stockholders Earnings Per Share [Text Block] Property and Equipment, Net Property, Plant and Equipment Disclosure [Text Block] 2018 Operating Leases, Capital Leases, Future Minimum Payments, Remainder Of Fiscal Year Operating Leases, Capital Leases, Future Minimum Payments, Remainder Of Fiscal Year 2019 Operating Leases, Capital Leases, Future Minimum Payments, Due In Two Years Operating Leases, Capital Leases, Future Minimum Payments, Due In Two Years 2020 Operating Leases, Capital Leases, Future Minimum Payments, Due In Three Years Operating Leases, Capital Leases, Future Minimum Payments, Due In Three Years 2021 Operating Leases, Capital Leases, Future Minimum Payments, Due In Four Years Operating Leases, Capital Leases, Future Minimum Payments, Due In Four Years 2022 Operating Leases, Capital Leases, Future Minimum Payments, Due In Five Years Operating Leases, Capital Leases, Future Minimum Payments, Due In Five Years Thereafter Operating Leases, Capital Leases, Future Minimum Payments, Due Thereafter Operating Leases, Capital Leases, Future Minimum Payments, Due Thereafter Total future minimum lease payments Operating Leases, Capital Leases, Future Minimum Payments Due, Total Operating Leases, Capital Leases, Future Minimum Payments Due, Total Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Sale of Stock [Axis] Sale of Stock [Axis] Sale of Stock [Domain] Sale of Stock [Domain] IPO IPO [Member] Class of Stock [Line Items] Class of Stock [Line Items] Stock sold (in shares) Sale of Stock, Number of Shares Issued in Transaction Issuance of common stock upon conversion of redeemable convertible preferred stock (in shares) 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 Concentration Risk [Table] Concentration Risk [Table] 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] Number of operating segments Number of Operating Segments Concentration risk, percentage Concentration Risk, Percentage Fair Value Measurements Fair Value Disclosures [Text Block] Restricted shares Restricted Stock [Member] Restricted stock units Restricted Stock Units (RSUs) [Member] 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 grante 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) 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 Employee Stock [Member] 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 Revenue recognized that was included in deferred revenue Contract with Customer, Liability, Revenue Recognized Consolidations Consolidation, Policy [Policy Text Block] Basis of Accounting Basis of Accounting, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Investments Investment, Policy [Policy Text Block] Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Recent Accounting Pronouncements Not Yet Adopted New Accounting Pronouncements, Policy [Policy Text Block] 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] Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Schedule of assets measured at fair value on recurring basis Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Stock-based awards Stock Compensation Plan [Member] Employee stock purchase plan 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] 2018 ESPP Employee Stock Purchase Plan 2018 [Member] Employee Stock Purchase 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 Common stock reserved for issuance (in shares) Common Stock, Capital Shares Reserved for Future Issuance 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 Schedule of Product Information [Table] Schedule of Product Information [Table] Contract with Customer, Sales Channel [Axis] Contract with Customer, Sales Channel [Axis] Contract with Customer, Sales Channel [Domain] Contract with Customer, Sales Channel [Domain] Channel network Sales Channel, Through Intermediary [Member] 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 [Member] Customer concentration risk Customer Concentration Risk [Member] Professional services and other revenue Service, Other [Member] Revenue 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] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Credit Facility Credit Facility [Member] Credit Facility [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] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Credit Facility Revolving Credit Facility [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 outstanding Line of Credit Facility, Maximum Amount Outstanding During Period 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 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 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] Stock option 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] 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