Property, Plant and Equipment [Abstract] Property and equipment, net Property, Plant and Equipment [Table Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] 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 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 Stockholders' Equity Note [Abstract] Redeemable Convertible Preferred Stock and Common Stock Stockholders' Equity Note Disclosure [Text Block] Disclosure of Compensation Related Costs, Share-based Payments 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Available-for-sale, Amortized Cost Unrealized Gain Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax Unrealized Loss Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax Estimated fair value Debt Securities, Available-for-sale 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] United States UNITED STATES 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 Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Series A 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Accretion to Redemption Value 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 Stockholders' Equity Attributable to Parent 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) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Issuance of common stock under employee stock purchase plan (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Issuance of common stock under employee stock purchase plan Stock Issued During Period, Value, Employee Stock Purchase Plan Stock-based compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Other comprehensive income Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Net loss Net Income (Loss) Attributable to Parent Balance (in shares) Balance Leases [Abstract] Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Remaining term of leases Lessee, Operating Lease, Term of Contract Leases, renewal term Lessee, Operating Lease, Renewal Term Options to terminate lease Lessee, Operating Lease, Options To Terminate Lessee, Operating Lease, Options To Terminate Lease payments expected to commence Lessee, Operating Lease, Lease Not Yet Commenced, Future Lease Payments Lessee, Operating Lease, Lease Not Yet Commenced, Future Lease Payments 2019 Lessee, Operating Lease, Liability, Payments, 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Over-Allotment Option [Member] Class of Stock [Line Items] Class of Stock [Line Items] Stock sold (in shares) Sale of Stock, Number of Shares Issued in Transaction 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 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) Common Stock, Shares Authorized Preferred stock, authorized (in shares) Preferred Stock, Shares Authorized Property and Equipment, Net Property, Plant and Equipment Disclosure [Text Block] Earnings Per Share [Abstract] 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] Stock options Employee Stock Option [Member] Restricted stock units Restricted Stock Units (RSUs) [Member] Restricted shares Restricted Stock [Member] 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 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 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issued (in shares) Common Stock, Shares, Issued Common stock, shares outstanding (in shares) Summary of revenue Disaggregation of Revenue [Table Text Block] Activity of deferred contract costs Capitalized Contract Cost [Table Text Block] 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] Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Investments Investment, Policy [Policy Text Block] Leases Lessee, Leases [Policy Text Block] Recent Accounting Pronouncements Not Yet Adopted New Accounting Pronouncements, Policy [Policy Text Block] 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] Employee stock purchase plan Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] 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 Summary of amortized cost, unrealized gain and loss and estimated fair value Debt Securities, Available-for-sale [Table Text Block] 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 Debt Disclosure [Abstract] Debt Debt Disclosure [Text Block] 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 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 $370 and $188 at March 31, 2019 and December 31, 2018, 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 Operating lease right-of-use assets Operating Lease, Right-of-Use Asset Other assets Other Assets, Noncurrent Total assets Assets Liabilities and Stockholders’ Equity 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 Other liabilities Other Liabilities, Noncurrent Total liabilities Liabilities Stockholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Common stock (par value: $0.01; 500,000 shares authorized; 96,203 and 93,126 shares issued and outstanding at March 31, 2019 and December 31, 2018, respectively) Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated deficit Retained Earnings (Accumulated Deficit) Total stockholders’ equity Total liabilities and stockholders’ equity Liabilities and Equity Geographic Information Segment Reporting Disclosure [Text Block] Disaggregation of 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Amortization Period Business and Summary of Significant Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Statement of Cash Flows [Abstract] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net loss to net cash (used in) provided by 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 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) provided by 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 Sales and maturities of short-term investments Proceeds from Sale, Maturity and Collection of 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 stock issued in connection with the employee stock purchase plan Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Excluding Stock Options Proceeds from the exercise of stock options Proceeds from Stock Options Exercised 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 cash flow information related to leases: Cash Flow, Operating Activities, Lessee [Abstract] Operating cash payments for operating leases Operating Lease, Payments Operating cash payments for finance leases Finance Lease, Interest Payment on Liability Financing cash payments for finance leases Finance Lease, Principal Payments Supplemental disclosure of non-cash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Asset retirement obligations Settlement of Asset Retirement Obligations Through Noncash Payments, Amount Computation of basic and diluted 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for Future Issuance 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 Common stock purchased (in shares) Share price (in USD per share) Share Price Employee contributions Employee-related Liabilities Unrecognized stock-based compensation expense Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Remaining offering period Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 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) 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 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 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 Customer concentration risk Customer Concentration Risk [Member] 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 Prime Rate [Member] Line of Credit Facility [Line 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Exchange for Operating Lease Liability Finance leases Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Cash and Cash Equivalents and Short-Term Investments Cash, Cash Equivalents, and Short-term Investments [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 recognized that was included in deferred revenue Contract with Customer, Liability, Revenue Recognized 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 Depreciation and amortization Depreciation and Amortization, Property and Equipment Depreciation and amortization related to property and equipment Schedule of assets measured at fair value on recurring basis Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Components of leases Lease, Cost [Table Text Block] Schedule of maturities of operating lease liabilities Lessee, Operating Lease, Liability, Maturity [Table Text Block] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] 2018 Equity Incentive Plan Equity Incentive Plan 2018 [Member] Equity 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(Loss), Net of Tax, Portion Attributable to Parent [Abstract] Unrealized gains on available-for-sale securities Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Other comprehensive income Comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent 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) Interest income (expense), net Interest Income (Expense), Net Other Nonoperating Income (Expense) Other Nonoperating Income (Expense) Loss before income taxes Income (Loss) Attributable to 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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) Americas Americas [Member] Europe, Middle East and Africa EMEA [Member] Asia Pacific Asia Pacific [Member] Redeemable convertible preferred stock, par value (in usd per share) Temporary Equity, Par or Stated Value Per Share 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