Entity Central Index Key Cover [Abstract] Document Information [Table] Document Information [Table] Class of Stock Statement Class Of Stock [Axis] Class of Stock Class Of Stock [Domain] Class A Common Stock Common Class A [Member] Class B Common Stock Common Class B [Member] Document Information [Line Items] Document Information [Line Items] Document Type Document Type Amendment Flag Amendment Flag Document Quarterly Report Document Quarterly Report Document Transition Report Document Transition Report Entity Interactive Data Current Entity Interactive Data Current Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Trading Symbol Trading Symbol Entity Registrant Name Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Ex Transition Period Entity Ex Transition Period Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Entity Shell Company Entity Shell Company Entity Current Reporting Status Entity Current Reporting Status Entity File Number Entity File Number Entity Tax Identification Number Entity Tax Identification Number Entity Address, Address Line One Entity Address Address Line1 Entity Address, Address Line Two Entity Address Address Line2 Entity Address, City or Town Entity Address City Or Town Entity Address, State or Province Entity Address State Or Province Entity Address, Postal Zip Code Entity Address Postal Zip Code City Area Code City Area Code Local Phone Number Local Phone Number Title of 12(b) Security Security12b Title Security Exchange Name Security Exchange Name Entity Incorporation, State or Country Code Entity Incorporation State Country Code Statement Of Financial Position [Abstract] Statement [Table] Statement [Table] 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 Accounts receivable, net of allowance for doubtful accounts of $516 and $477 as of September 30, 2019 and December 31, 2018, respectively Accounts Receivable Net Current Deferred contract costs, current Deferred Costs Current Prepaid expenses and other current assets Prepaid Expense And Other Assets Current Total current assets Assets Current Property and equipment, net Property Plant And Equipment Net Operating lease assets Operating Lease Right Of Use Asset Goodwill Goodwill Intangible assets, net Finite Lived Intangible Assets Net Deferred contract costs, non-current Deferred Costs Restricted cash Restricted Cash And Cash Equivalents Noncurrent Other assets Other Assets Noncurrent TOTAL ASSETS Assets LIABILITIES, CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) Liabilities And Stockholders Equity [Abstract] CURRENT LIABILITIES: Liabilities Current [Abstract] Accounts payable Accounts Payable Current Accrued expenses and other current liabilities Accrued Liabilities And Other Liabilities Operating lease liabilities, current Operating Lease Liability Current Deferred revenue, current Deferred Revenue Current Total current liabilities Liabilities Current Operating lease liabilities, non-current Operating Lease Liability Noncurrent Deferred revenue, non-current Deferred Revenue Noncurrent Other liabilities Other Liabilities Noncurrent Total liabilities Liabilities COMMITMENTS AND CONTINGENCIES (NOTE 7) Commitments And Contingencies CONVERTIBLE PREFERRED STOCK: Temporary Equity [Abstract] Convertible preferred stock; $0.00001 par value per share; 0 and 179,814,912 shares authorized as of September 30, 2019 and December 31, 2018, respectively; 0 and 179,814,912 shares issued and outstanding as of September 30, 2019 and December 31, 2018, respectively Temporary Equity Carrying Amount Attributable To Parent STOCKHOLDERS' EQUITY (DEFICIT): Stockholders Equity [Abstract] Preferred stock; $0.00001 par value per share; 20,000,000 and 0 shares authorized as of September 30, 2019 and December 31, 2018, respectively; 0 shares issued and outstanding as of September 30, 2019 and December 31, 2018, respectively Preferred Stock Value Common stock, value Common Stock Value Additional paid-in capital Additional Paid In Capital Common Stock Accumulated other comprehensive (loss) income Accumulated Other Comprehensive Income Loss Net Of Tax Accumulated deficit Retained Earnings Accumulated Deficit Total stockholders’ equity (deficit) Stockholders Equity TOTAL LIABILITIES, CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) Liabilities And Stockholders Equity Convertible Preferred Stock Convertible Preferred Stock [Member] Accounts receivable, net of allowance for doubtful accounts Allowance For Doubtful Accounts Receivable Current Convertible preferred stock, par value Temporary Equity Par Or Stated Value Per Share Convertible preferred stock, shares authorized Temporary Equity Shares Authorized Convertible preferred stock, shares issued Temporary Equity Shares Issued Convertible preferred stock, shares outstanding Temporary Equity Shares Outstanding Preferred stock, par value Preferred Stock Par Or Stated Value Per Share Preferred stock, shares authorized Preferred Stock Shares Authorized Preferred stock, shares issued Preferred Stock Shares Issued Preferred stock, shares outstanding Preferred Stock Shares Outstanding Common stock, par value Common Stock Par Or Stated Value Per Share Common stock, shares authorized Common Stock Shares Authorized Common stock, shares issued Common Stock Shares Issued Common stock, shares outstanding Common Stock Shares Outstanding Statement Of Income And Comprehensive Income [Abstract] Revenue Revenue From Contract With Customer Excluding Assessed Tax Cost of revenue Cost Of Goods And Services Sold Gross profit Gross Profit Operating expenses: Operating Expenses [Abstract] Research and development Research And Development Expense Sales and marketing Selling And Marketing Expense General and administrative General And Administrative Expense Total operating expenses Operating Expenses Operating loss Operating Income Loss Other income, net Other Nonoperating Income Expense Loss before provision for income taxes Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest Provision for income taxes Income Tax Expense Benefit Net loss Net Income Loss Other comprehensive (loss) income—foreign currency translation adjustments Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax Comprehensive loss Comprehensive Income Net Of Tax Net loss attributable to common stockholders Basic and diluted net loss per share Earnings Per Share Basic And Diluted Weighted average shares used in calculating basic and diluted net loss per share: Weighted Average Number Of Share Outstanding Basic And Diluted Adjustments to additional paid in capital vesting of early exercise of stock options. Reclassification of shares of common stock. Conversion of non-voting common stock, shares. Conversion of non-voting common stock, value. Statement Of Stockholders Equity [Abstract] Common Stock Statement Equity Components [Axis] Equity Component Equity Component [Domain] Common Stock Common Stock [Member] Additional Paid-in Capital Additional Paid In Capital [Member] Accumulated Other Comprehensive (Loss) Income Accumulated Other Comprehensive Income [Member] Accumulated Deficit Retained Earnings [Member] Class A and class B common stock. Class A and Class B Common Stock Class A And Class B Common Stock [Member] Sale of Stock Subsidiary Sale Of Stock [Axis] Sale of Stock Sale Of Stock Name Of Transaction [Domain] Initial Public Offering I P O [Member] Non-Voting Common Stock Nonvoting Common Stock [Member] Third-party tender offer. Third-Party Tender Offer Third Party Tender Offer [Member] Convertible preferred stock, beginning balance, shares Convertible preferred stock, beginning balance Beginning balance, shares Shares Outstanding Beginning balance Issuance of common stock upon exercise of stock options, shares Stock Issued During Period Shares Stock Options Exercised Issuance of common stock upon exercise of stock options Stock Issued During Period Value Stock Options Exercised Vesting of early exercised stock options Adjustments To Additional Paid In Capital Vesting Of Early Exercise Of Stock Options Stock-based compensation Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value Conversion of non-voting common stock, shares Conversion Of Non Voting Common Stock Shares Conversion of non-voting common stock Conversion Of Non Voting Common Stock Value Issuance of class A common stock in connection with initial public offering, net of underwriting discounts and issuance costs, shares Stock Issued During Period Shares New Issues Issuance of class A common stock in connection with initial public offering, net of underwriting discounts and issuance costs Stock Issued During Period Value New Issues Conversion of convertible preferred stock to common stock, shares Stock Issued During Period Shares Conversion Of Convertible Securities Conversion of convertible preferred stock to common stock Stock Issued During Period Value Conversion Of Convertible Securities Change in accumulated other comprehensive (loss) income Reclassification of common stock to class A and class B common stock, shares Reclassification Of Shares Of Common Stock Net loss Convertible preferred stock, ending balance, shares Convertible preferred stock, ending balance Ending balance, shares Ending balance Noncash lease expense. Non cash vesting of early exercised options. Non cash costs related to initial public offering included in accounts payable and accrued liabilities. Statement Of Cash Flows [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES: Net Cash Provided By Used In Operating Activities [Abstract] Net loss Profit Loss Adjustments to reconcile net loss to net cash provided by operating activities: Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities [Abstract] Depreciation and amortization Depreciation And Amortization Amortization of deferred contract costs Amortization Of Financing Costs Stock-based compensation, net of amounts capitalized Share Based Compensation Noncash lease expense Noncash Lease Expense Provision for accounts receivable allowance Provision For Doubtful Accounts Loss (gain) on disposal of property and equipment Gain Loss On Disposition Of Assets Changes in operating assets and liabilities: Increase Decrease In Operating Capital [Abstract] Accounts receivable, net Increase Decrease In Accounts Receivable Deferred contract costs Increase Decrease In Deferred Charges Prepaid expenses and other current assets Increase Decrease In Prepaid Deferred Expense And Other Assets Other assets Increase Decrease In Other Operating Assets Accounts payable Increase Decrease In Accounts Payable Accrued expenses and other liabilities Increase Decrease In Accrued Liabilities And Other Operating Liabilities Deferred revenue Increase Decrease In Contract With Customer Liability Net cash 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 Capitalized software development costs Payments To Develop Software Cash paid for acquisition of businesses; net of cash acquired Payments To Acquire Businesses Net Of Cash Acquired 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 exercise of stock options Proceeds From Stock Options Exercised Proceeds from initial public offering, net of underwriting discounts and commissions and other offering costs Proceeds From Issuance Initial Public Offering Net cash provided by financing activities Net Cash Provided By Used In Financing Activities Effect of exchange rate changes on cash and cash equivalents Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CASH, CASH EQUIVALENTS AND RESTRICTED CASH—Beginning of period Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Including Disposal Group And Discontinued Operations CASH, CASH EQUIVALENTS AND RESTRICTED CASH —End of period SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION: Supplemental Cash Flow Information [Abstract] 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] Accrued property and equipment purchases Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 Stock-based compensation included in capitalized software development costs Employee Service Share Based Compensation Allocation Of Recognized Period Costs Capitalized Amount Vesting of early exercised options Non Cash Vesting Of Early Exercised Options Costs related to initial public offering included in accounts payable and accrued liabilities Non Cash Costs Related To Initial Public Offering Included In Accounts Payable And Accrued Liabilities RECONCILIATION OF CASH, CASH EQUIVALENTS AND RESTRICTED CASH WITHIN THE CONSOLIDATED BALANCE SHEETS TO THE AMOUNTS SHOWN IN THE STATEMENTS OF CASH FLOWS ABOVE: Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents [Abstract] Restricted cash – Including amounts in prepaid expense and other current assets and other assets Restricted Cash And Cash Equivalents Restricted Cash and Cash Equivalents, Asset, Statement of Financial Position [Extensible List] Restricted Cash And Cash Equivalents Asset Statement Of Financial Position Extensible List Organization Consolidation And Presentation Of Financial Statements [Abstract] Organization and Description of Business Organization Consolidation And Presentation Of Financial Statements Disclosure [Text Block] Accounting Policies [Abstract] Basis of Presentation and Summary of Significant Accounting Policies Basis Of Presentation And Significant Accounting Policies [Text Block] Prepaid expenses and other current assets. Prepaid Expense And Other Assets Current [Abstract] Prepaid Expenses and Other Current Assets Prepaid Expenses And Other Current Assets [Text Block] Property Plant And Equipment [Abstract] Property and Equipment, Net Property Plant And Equipment Disclosure [Text Block] Acquisitions, intangible assets and goodwill disclosure. Business Combinations [Abstract] Acquisition, Intangible Assets and Goodwill Acquisitions Intangible Assets And Goodwill Disclosure [Text Block] Payables And Accruals [Abstract] Accrued Expenses and Other Current Liabilities Accounts Payable Accrued Liabilities And Other Liabilities Disclosure Current [Text Block] Commitments And Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments And Contingencies Disclosure [Text Block] Leases [Abstract] Leases Lessee Operating Leases [Text Block] Equity [Abstract] Stockholders’ Equity (Deficit) Stockholders Equity Note Disclosure [Text Block] Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Earnings Per Share [Abstract] Net Loss Per Share Earnings Per Share [Text Block] Basis of Presentation Basis Of Accounting Policy Policy [Text Block] Principles of Consolidation Consolidation Policy [Text Block] Stock Split and Authorized Shares Stockholders Equity Policy [Text Block] Segment Information Segment Reporting Policy Policy [Text Block] Use of Estimates Use Of Estimates Unaudited interim condensed consolidated financial information. Unaudited Interim Condensed Consolidated Financial Information Unaudited Interim Condensed Consolidated Financial Information Policy [Text Block] Foreign Currency Translation Foreign Currency Transactions And Translations Policy [Text Block] Revenue Recognition Revenue From Contract With Customer Policy [Text Block] Cost of Revenue Cost Of Sales Policy [Text Block] Research and Development Costs Research And Development Expense Policy Advertising Costs Advertising Costs Policy [Text Block] Income Taxes Income Tax Policy [Text Block] Stock-Based Compensation Compensation Related Costs Policy [Text Block] Cash and Cash Equivalents Cash And Cash Equivalents Policy [Text Block] Restricted Cash Cash And Cash Equivalents Restricted Cash And Cash Equivalents Policy Concentration of Credit Risk Concentration Risk Credit Risk Geographical information. Geographical Information Geographical Information Policy [Text Block] Fair Value of Financial Instruments Fair Value Of Financial Instruments Policy Accounts Receivable Trade And Other Accounts Receivable Policy Internal Use Software Development Costs Internal Use Software Policy Property and Equipment, Net Property Plant And Equipment Policy [Text Block] Deferred contract costs. Deferred Contract Costs Deferred Contract Costs Policy [Text Block] Business Combinations Business Combinations Policy Accounting for Impairment of Long-Lived Assets (Including Goodwill and Intangibles) Impairment Or Disposal Of Long Lived Assets Including Intangible Assets Policy Policy [Text Block] Operating Leases Lessee Leases Policy [Text Block] Revenue from contract with customer deferred revenue. Deferred Revenue Revenue From Contract With Customer Deferred Revenue Policy [Text Block] Net Loss Per Share Attributable to Common Shareholders Earnings Per Share Policy [Text Block] Accounting Pronouncements Recently Adopted New Accounting Pronouncements Policy Policy [Text Block] Accounting pronouncements not yet adopted. Accounting Pronouncements Not Yet Adopted Accounting Pronouncements Not Yet Adopted Policy [Text Block] Schedule of Revenue by Geographic Area Revenue From External Customers By Geographic Areas Table [Text Block] Schedule of Deferred Contract Costs Capitalized Contract Cost Table [Text Block] Schedule of finite lived intangible assets including goodwill estimated useful lives. Schedule of Long-lived Assets Amortized Over Estimated Useful Lives Schedule Of Finite Lived Intangible Assets Including Goodwill Estimated Useful Lives Table [Text Block] Schedule of prepaid expenses and other current assets. Schedule of Prepaid Expenses and Other Current Assets Schedule Of Prepaid Expenses And Other Current Assets Table [Text Block] Components of Property and Equipment, Net Property Plant And Equipment [Text Block] Summary of Aggregate Purchase Consideration and Estimated Fair Values of Assets Acquired and Liabilities Schedule Of Recognized Identified Assets Acquired And Liabilities Assumed Table [Text Block] Schedule of Intangibles, Net Schedule Of Finite Lived Intangible Assets Table [Text Block] Schedule of Future Amortization Expense Scheduleof Finite Lived Intangible Assets Future Amortization Expense Table [Text Block] Schedule of Accrued Expenses and Other Current Liabilities Schedule Of Accounts Payable And Accrued Liabilities Table [Text Block] Summary of Components of Lease Cost Recognized Lease Cost Table [Text Block] Supplemental cash flow information and non-cash activity. Summary of Supplemental Cash Flow Information and Non-cash Activity Supplemental Cash Flow Information And Non Cash Activity Table [Text Block] Summary of Maturities of Lease Liabilities Lessee Operating Lease Liability Maturity Table [Text Block] Weighted average remaining lease term and discount rate. Summary of Weighted Average Remaining Lease Term and Discount Rate Weighted Average Remaining Lease Term And Discount Rate Table [Text Block] Summary of Stock Option Activity Schedule Of Share Based Compensation Stock Options Activity Table [Text Block] Summary of Stock-based Compensation Expense Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Text Block] Schedule of Calculation of Basic and Diluted Net Loss Per Share Schedule Of Earnings Per Share Basic And Diluted Table [Text Block] Schedule of Potentially Dilutive Securities not Included in Diluted Per Share Calculations Schedule Of Antidilutive Securities Excluded From Computation Of Earnings Per Share [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] IPO Underwriters Over Allotment Option [Member] Subsidiary Sale Of Stock [Line Items] Subsidiary Sale Of Stock [Line Items] Date of Incorporation Entity Incorporation Date Of Incorporation Common stock offering price Sale Of Stock Price Per Share Net proceeds after deducting underwriting discounts and commissions Expense Related To Distribution Or Servicing And Underwriting Fees Underwriters exercised option to purchase additional shares Sale Of Stock Number Of Shares Issued In Transaction Additional proceeds net of underwriters discounts and commissions Convertible preferred stock converted into common stock Convertible Preferred Stock Shares Issued Upon Conversion Net deferred offering costs Deferred Offering Costs Basis of presentation and summary of significant accounting policies. Basis of presentation and summary of significant accounting policies. Basis Of Presentation And Summary Of Significant Accounting Policies [Table] Basis Of Presentation And Summary Of Significant Accounting Policies [Table] Class A Class B Income Statement Location Income Statement Location [Axis] Income Statement Location Income Statement Location [Domain] Sales and Marketing Selling And Marketing Expense [Member] Concentration Risk Type Concentration Risk By Type [Axis] Concentration Risk Type Concentration Risk Type [Domain] Customer Concentration Risk Customer Concentration Risk [Member] Concentration Risk Benchmark Concentration Risk By Benchmark [Axis] Concentration Risk Benchmark Concentration Risk Benchmark [Domain] Revenue Sales Revenue Net [Member] Accounts Receivable Accounts Receivable [Member] Geographical Statement Geographical [Axis] Geographical Segment Geographical [Domain] North America North America [Member] Out of North America. Out of North America Out Of North America [Member] Balance Sheet Location Balance Sheet Location [Axis] Balance Sheet Location Balance Sheet Location [Domain] Accounts receivable net. Accounts Receivable Accounts Receivable Net [Member] Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] Basis Of Presentation And Summary Of Significant Accounting Policies [Line Items] Stock split, conversion ratio Stockholders Equity Note Stock Split Conversion Ratio1 Number of operating segment Number Of Operating Segments Number of reportable segment Number Of Reportable Segments Advertising costs Advertising Expense Number of major customers. Number of major customers representing greater than 10% Number Of Major Customers Disaggregation Of Revenue [Table] Disaggregation Of Revenue [Table] International. International International [Member] Disaggregation Of Revenue [Line Items] Disaggregation Of Revenue [Line Items] Revenue by geographic area Percentage of long lived assets. Percentage of long lived assets Percentage Of Long Lived Assets Unbilled accounts receivable Unbilled Receivables Current Deferred contract costs amortization period Capitalized Contract Cost Amortization Period Deferred contract costs Deferred Costs Current And Noncurrent Amortization expense Adjustment For Amortization Capitalized Contract Cost [Abstract] Balance as of December 31, 2018 Capitalized Contract Cost Net Additions to deferred contract costs Amortization of deferred contract costs Capitalized Contract Cost Amortization Balance as of September 30, 2019 Schedule Of Acquired Finite Lived Intangible Asset By Major Class [Table] Schedule Of Acquired Finite Lived Intangible Asset By Major Class [Table] Property, Plant and Equipment, Type Property Plant And Equipment By Type [Axis] Property, Plant and Equipment, Type Property Plant And Equipment Type [Domain] Computers and Equipment Computer Equipment [Member] Furnitures and Fixtures Furniture And Fixtures [Member] Leasehold Improvements Leasehold Improvements [Member] Capitalized Software Development Costs Software And Software Development Costs [Member] Statistical Measurement Range [Axis] Statistical Measurement Range [Member] Minimum Minimum [Member] Maximum Maximum [Member] Acquired Finite Lived Intangible Assets [Line Items] Acquired Finite Lived Intangible Assets [Line Items] Property and equipment, useful lives Property Plant And Equipment Useful Life Leasehold improvements, useful life Property Plant And Equipment Estimated Useful Lives Intangible assets, useful life Finite Lived Intangible Asset Useful Life Impairment of goodwill Goodwill Impairment Loss Operating lease costs Operating Lease Cost Sublease income Sublease Income Variable lease costs Variable Lease Cost Short-term lease costs Short Term Lease Cost Gross lease expense Lease Cost Revenue recognized Contract With Customer Liability Revenue Recognized Deferred revenue Contract With Customer Liability Revenue Performance Obligation [Abstract] 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 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] Remaining performance obligations Revenue Remaining Performance Obligation Remaining performance obligations, expected to recognize period Revenue Remaining Performance Obligation Expected Timing Of Satisfaction Period1 Right of use asset Lease liability Operating Lease Liability Prepaid hosting. General prepaid expense. Hosting Prepaid Hosting General prepaid expenses General Prepaid Expense Other receivables Other Receivables Net Current Marketing Prepaid Advertising Rent Prepaid Rent Restricted cash Restricted Cash Current Total prepaid expenses and other current assets Schedule Of Property Plant And Equipment [Table] Schedule Of Property Plant And Equipment [Table] Property Plant And Equipment [Line Items] Property Plant And Equipment [Line Items] Total property and equipment Property Plant And Equipment Gross Less: accumulated depreciation and amortization Accumulated Depreciation Depletion And Amortization Property Plant And Equipment Total property and equipment, net Depreciation and amortization expense Depreciation Depletion And Amortization Acquisition, intangible assets and goodwill. Acquisition, intangible assets and goodwill. Acquisition Intangible Assets And Goodwill [Table] Acquisition Intangible Assets And Goodwill [Table] Business Acquisition Business Acquisition [Axis] Business Acquisition, Acquiree Business Acquisition Acquiree [Domain] Madumbo. Madumbo Madumbo [Member] Acquisition Intangible Assets And Goodwill [Line Items] Acquisition Intangible Assets And Goodwill [Line Items] Cash consideration Transaction costs Business Acquisition Cost Of Acquired Entity Transaction Costs Business combination recognized identifiable assets acquired and liabilities assumed developed technology. Schedule Of Business Acquisitions By Acquisition [Table] Schedule Of Business Acquisitions By Acquisition [Table] Business Acquisition [Line Items] Business Acquisition [Line Items] Fair value of net assets acquired: Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Assets [Abstract] Net tangible assets (liabilities) Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Liabilities Developed technology Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Developed Technology Total fair value of net assets acquired Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Net Goodwill And Intangible Assets Disclosure [Abstract] Schedule Of Finite Lived Intangible Assets [Table] Schedule Of Finite Lived Intangible Assets [Table] Finite-Lived Intangible Assets by Major Class Finite Lived Intangible Assets By Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name Finite Lived Intangible Assets Major Class Name [Domain] Developed Technology Developed Technology Rights [Member] Customer Relationships Customer Relationships [Member] Finite Lived Intangible Assets [Line Items] Finite Lived Intangible Assets [Line Items] Gross Carrying Amount Finite Lived Intangible Assets Gross Accumulated Amortization Finite Lived Intangible Assets Accumulated Amortization Net Carrying Amount Amortization Period Finite Lived Intangible Assets Remaining Amortization Period1 Intangible amortization expense Amortization Of Intangible Assets Remainder of 2019 Finite Lived Intangible Assets Amortization Expense Remainder Of Fiscal Year 2020 Finite Lived Intangible Assets Amortization Expense Rolling Year Two 2021 Finite Lived Intangible Assets Amortization Expense Rolling Year Three Accrued compensation and commissions. Accrued early exercise liability stock options. Accrued compensation and commissions Accrued Compensation And Commissions Early exercise liability-stock options Accrued Early Exercise Liability Stock Options Income tax liability Accrued Income Taxes Current Payroll and sales taxes Accrued Payroll Taxes Current Deferred rent Accrued Rent Current Accrued expenses Accrued Liabilities Current Total accrued expenses and other current liabilities Lessee operating lease expiration period. Commitments and contingencies. Commitments and contingencies. Commitments And Contingencies [Table] Commitments And Contingencies [Table] Commitments And Contingencies [Line Items] Commitments And Contingencies [Line Items] Noncancelable operating leases Lessee Operating Lease Expiration Period Contingent federal payroll tax liability. Contingent federal payroll tax liability Contingent Federal Payroll Tax Liability Benefit on federal payroll tax liability Current Federal Tax Expense Benefit Total purchase commitment Long Term Purchase Commitment Amount Purchase commitment payable period Longterm Purchase Commitment Period Lessee operating lease termination term. Lessee Lease Description [Table] Lessee Lease Description [Table] Lessee Lease Description [Line Items] Lessee Lease Description [Line Items] Noncancelable operating lease expiration period Operating lease, renewal term Lessee Operating Lease Renewal Term Operating lease, termination term Lessee Operating Lease Termination Term Operating lease, option to terminate Lessee Operating Lease Option To Terminate Lessee, Operating Lease, Existence of Option to Terminate [true false] Lessee Operating Lease Existence Of Option To Terminate Lease, Practical Expedient, Lessor Single Lease Component [true false] Lease Practical Expedient Lessor Single Lease Component Operating lease cost Variable lease cost Short-term lease cost Operating lease right-of-use asset amortization. Operating lease, right of use amortization Operating Lease Right Of Use Asset Amortization Cash paid for amounts included in measurement of lease liabilities Operating Lease Payments Operating lease assets obtained in exchange for new lease liabilities Right Of Use Asset Obtained In Exchange For Operating Lease Liability Remainder of 2019 Lessee Operating Lease Liability Payments Remainder Of Fiscal Year 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 2024 and beyond 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 Present value of lease liabilities Weighted average remaining lease term Operating Lease Weighted Average Remaining Lease Term1 Weighted average discount rate Operating Lease Weighted Average Discount Rate Percent Number of voting rights entitled to stockholders per share. Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Plan Name Plan Name [Axis] Plan Name Plan Name [Domain] Two Thousand Twelve Equity Incentive Plan. 2012 Equity Incentive Plan Two Thousand Twelve Equity Incentive Plan [Member] Two Thousand Nineteen Equity Incentive Plan. 2019 Equity Incentive Plan Two Thousand Nineteen Equity Incentive Plan [Member] Award Type Award Type [Axis] Award Type Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain] Stock Option Employee Stock Option [Member] Employee Stock Purchase Plan. Employee Stock Purchase Plan Employee Stock Purchase Plan [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 voting rights entitled to stockholders per share Common Stock Voting Rights Number of voting rights entitled to stockholders per share Number Of Voting Rights Entitled To Stockholders Per Share Class A common stock issuable upon conversion of Class B common stock Number of shares authorized to grant award Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized Number of shares available for grant Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant Number Of Options Outstanding Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Roll Forward Balance—December 31, 2018 Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number Options granted Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross Options exercised Options forfeited Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period Balance—September 30, 2019 Exercisable—September 30, 2019 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 Rollforward Balance—December 31, 2018 Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price Options granted Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price Options exercised Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price Options forfeited Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price Balance—September 30, 2019 Exercisable—September 30, 2019 Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price Weighted-Average Remaining Contractual Life (in Years) Share Based Compensation Arrangement By Share Based Payment Award Options Additional Disclosures [Abstract] Options outstanding Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 Options exercisable Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 Total compensation cost related to unvested awards not yet recognized Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Weighted average period over compensation cost related to unvested employee awards Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 Weighted average grant-date fair value of options granted Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value Intrinsic value of options exercised Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value Aggregate fair value of options vested Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested In Period Fair Value1 Common stock issued subject to repurchase related to early exercise of options. Early exercise of common stock Common Stock Issued Subject To Repurchase Related To Early Exercise Of Options Employee stock purchase plans purchase price per share percentage. Initial public offering price Shares Issued Price Per Share Percentage of purchase the shares at a price per share Employee Stock Purchase Plans Purchase Price Per Share Percentage Share-based payment arrangement, expense Allocated Share Based Compensation Expense Amounts withheld on behalf of employees for a future purchase due to the timing of payroll deductions Payments Related To Tax Withholding For Share Based Compensation Share Based Compensation Allocation And Classification In Financial Statements [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] Cost of Revenue Cost Of Sales [Member] Research and Development Research And Development Expense [Member] General and Administrative General And Administrative Expense [Member] Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] Stock-based compensation, net of amounts capitalized Capitalized stock-based compensation expense Total stock-based compensation expense Sharebased Compensation Arrangement By Sharebased Payment Award Compensation Cost1 Effective tax rate Effective Income Tax Rate Continuing Operations Uncertain tax positions Unrecognized Tax Benefits Period Increase Decrease Reallocation of undistributed income (loss) result of conversion of common stock. Weighted average number diluted shares outstanding conversion of common shares class. Schedule Of Earnings Per Share Basic By Common Class [Table] Schedule Of Earnings Per Share Basic By Common Class [Table] Earnings Per Share Basic [Line Items] Earnings Per Share Basic [Line Items] Basic net loss per share: Earnings Per Share Basic [Abstract] Weighted average shares used in calculating net loss per share, basic Weighted Average Number Of Shares Outstanding Basic Basic net loss per share Earnings Per Share Basic Diluted net loss per share: Earnings Per Share Diluted [Abstract] Allocation of distributed loss for basic computation Distributed Earnings Reallocation of undistributed loss as a result of conversion of Class B to Class A shares Reallocation Of Undistributed Income Loss Result Of Conversion Of Common Stock Allocation of undistributed loss Undistributed Earnings Loss Available To Common Shareholders Diluted Conversion of Class B to Class A common shares outstanding Weighted Average Number Diluted Shares Outstanding Conversion Of Common Shares Class Number of shares used in diluted calculation Weighted Average Number Of Diluted Shares Outstanding Diluted net loss per share Earnings Per Share Diluted 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 Antidilutive Securities Excluded From Computation Of Earnings Per Share By Antidilutive Securities [Axis] Antidilutive Securities, Name Antidilutive Securities Name [Domain] Shares Subject to Outstanding Stock Options Unvested early exercised stock options. Unvested Early Exercised Stock Options Unvested Early Exercised Stock Options [Member] Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items] Potentially dilutive securities not included in diluted per share calculations Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount