Stockholders' Equity Note [Abstract] Stockholders' Equity Shareholders' Equity and Share-based Payments [Text Block] Earnings Per Share [Abstract] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Class A Common Class A [Member] Class B Common Class B [Member] Class of Stock [Line Items] Class of Stock [Line Items] Net loss attributable to common stockholders Net Income (Loss) Attributable to Parent Weighted-average number of common shares outstanding used in computing basic and diluted net loss per common share (in shares) Weighted Average Number of Shares Outstanding, Basic and Diluted Net loss per common share, basic and diluted (in dollars per share) Earnings Per Share, Basic and Diluted Organization, Consolidation and Presentation of Financial Statements [Abstract] Unsatisfied or partially unsatisfied performance obligations Revenue, Remaining Performance Obligation 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] Performance obligation satisfaction period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Related Party Transactions [Abstract] Related Party Transactions Related Party Transactions Disclosure [Text Block] Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Potentially Dilutive Securities Excluded from Computation of Earnings Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Income Statement [Abstract] Revenue Revenues Cost of revenue Cost of Revenue 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 Loss from operations Operating Income (Loss) Interest expense, net Interest Income (Expense), Nonoperating, Net Other income, net Other Nonoperating Income (Expense) Loss before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Provision for income taxes Income Tax Expense (Benefit) Net loss Net loss per share attributable to common stockholders, basic and diluted (in dollars per share) Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted (in shares) Fair Value Disclosures [Abstract] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [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 [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [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] U.S. Treasury securities US Treasury Securities [Member] U.S. agency obligations US Government Corporations and Agencies Securities [Member] Commercial paper Commercial Paper [Member] Corporate notes and obligations Corporate Debt Securities [Member] Certificates of deposit Certificates of Deposit [Member] Cash equivalents Cash Equivalents [Member] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Total cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Total short-term investments Available-for-sale Securities, Debt Securities Total cash equivalents and short-term investments Cash Equivalents, and Short-term Investments Cash Equivalents, and Short-term Investments Commitments and Contingencies Disclosure [Abstract] Loss Contingencies [Table] Loss Contingencies [Table] Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Letter of credit Financial Standby Letter of Credit [Member] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Gross rent expense Operating Leases, Rent Expense Sublease income Sublease Income Operating lease, minimum obligation Operating Lease, Minimum Obligations Operating Lease, Minimum Obligations Tenant improvement reimbursements Tenant Improvements Letter of credit supporting obligations Loss Contingency, Estimate of Possible Loss Subsequent Events [Abstract] Subsequent Events Subsequent Events [Text Block] Basis of presentation Basis of Accounting, Policy [Policy Text Block] Basis of consolidation Consolidation, Policy [Policy Text Block] Use of estimates Use of Estimates, Policy [Policy Text Block] Financial information about segments and geographic areas Segment Reporting, Policy [Policy Text Block] Foreign currency transactions Foreign Currency Transactions and Translations Policy [Policy Text Block] Revenue recognition Revenue Recognition, Policy [Policy Text Block] Stock-based compensation Compensation Related Costs, Policy [Policy Text Block] Cash and cash equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Short-term investments Marketable Securities, Policy [Policy Text Block] Concentrations of credit risk Concentration Risk, Credit Risk, Policy [Policy Text Block] Non-trade receivables Receivables, Policy [Policy Text Block] Deferred commissions, net Revenue Recognition, Customer Acquisitions [Policy Text Block] Property and equipment, net Property, Plant and Equipment, Policy [Policy Text Block] Lease obligations Lessee, Leases [Policy Text Block] Long-lived assets, including goodwill and other acquired intangible assets, net Impairment or Disposal of Long-Lived Assets, Including Intangible Assets, Policy [Policy Text Block] Income taxes Income Tax, Policy [Policy Text Block] Fair value measurement Fair Value Measurement, Policy [Policy Text Block] Recently issued accounting pronouncements not yet adopted and Recently adopted accounting pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Goodwill Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block] Net loss per share Earnings Per Share, Policy [Policy Text Block] Schedule of Stock Option and Restricted Stock Activity Share-based Compensation, Activity [Table Text Block] Schedule of Pre-Tax Intrinsic Value Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] 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] Infrastructure Assets Held under Capital Leases Assets Held under Capital Leases [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Property and equipment, gross Property, Plant and Equipment, Gross Accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Depreciation Depreciation Cash and Cash Equivalents [Abstract] Schedule of Cash and Cash Equivalents [Table] Schedule of Cash and Cash Equivalents [Table] Cash Cash [Member] Cash and Cash Equivalents [Line Items] Cash and Cash Equivalents [Line Items] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Short-term investments, amortized cost Available-for-sale Debt Securities, Amortized Cost Basis Short-term investments, unrealized gain Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax Short-term investments, unrealized loss Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax Short-term investments, estimated fair value Total cash, cash equivalents, and short term investments, before unrealized gains (losses) on investments Cash, Cash Equivalents, And Short Term Investments, Amortized Cost Cash, Cash Equivalents, And Short Term Investments, Amortized Cost Total cash, cash equivalents, and short term investments Cash, Cash Equivalents, and Short-term Investments Statement of Comprehensive Income [Abstract] Net loss Other comprehensive income, net of tax: Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Change in foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Change in net unrealized losses on short-term investments Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Total other comprehensive income, net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent Cash and cash equivalents Short-term investments Available-for-sale Securities, Debt Securities, Current Cash in transit for credit and debit card transactions Credit and Debit Card Receivables, at Carrying Value Number of investments in unrealized loss positions Debt Securities, Available-For-Sale, Unrealized Loss Position, Number Of Positions Debt Securities, Available-For-Sale, Unrealized Loss Position, Number Of Positions Gross unrealized gains (losses) on available-for-sale securities reclassified out of AOCI Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax Gross realized gains (losses) on available-for-sale securities reclassified out of AOCI Debt Securities, Available-For-Sale, Realized Gain (Loss) Debt Securities, Available-For-Sale, Realized Gain (Loss) Other-than-temporary impairment loss Other-Than-Temporary Impairment Loss, Debt Securities, Available-For-Sale Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale Document and Entity Information [Abstract] Document and Entity Information [Abstract] Document Information [Table] Document Information [Table] Class A common stock Class B common stock Class C common stock Common Class C [Member] Document Information [Line Items] Document Information [Line Items] 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 Entity Common Stock, Shares Outstanding Subsequent Event [Table] Subsequent Event [Table] Sale of Stock [Axis] Sale of Stock [Axis] Sale of Stock [Domain] Sale of Stock [Domain] Underwriters Over-allotment Option Over-Allotment Option [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Sale of stock (in shares) Sale of Stock, Number of Shares Issued in Transaction Proceeds received in sale of stock Sale of Stock, Consideration Received on Transaction Amortized Cost Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis [Abstract] Due within one year Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis Due between one to four years Available For Sale Securities, Debt Maturities After One Through Four Years, Amortized Cost Available For Sale Securities, Debt Maturities After One Through Four Years, Amortized Cost Total Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis Estimated Fair Value Available-for-sale Securities, Debt Maturities, Single Maturity Date [Abstract] Due within one year Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value Due between one to four years Available For Sale Securities, Debt Maturities After One Through Four Years, Fair Value Available For Sale Securities, Debt Maturities After One Through Four Years, Fair Value Total Available-for-sale Securities, Debt Maturities, Single Maturity Date Schedule of Future Minimum Payments Contractual Obligation, Fiscal Year Maturity Schedule [Table Text Block] Statement of Financial Position [Abstract] Statement [Table] Statement [Table] Convertible preferred stock Convertible Preferred Stock [Member] Statement [Line Items] Statement [Line Items] Assets Assets [Abstract] Current assets: Assets, Current [Abstract] Trade and other receivables, net Accounts Receivable, Net, 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 Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Goodwill Goodwill Other assets Other Assets, Noncurrent Total assets Assets Liabilities and stockholders’ equity Liabilities and Equity [Abstract] Liabilities Liabilities [Abstract] Current liabilities: Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Accrued and other current liabilities Accrued Liabilities and Other Liabilities, Current Accrued Liabilities and Other Liabilities, Current Accrued compensation and benefits Employee-related Liabilities, Current Capital lease obligation Capital Lease Obligations, Current Deferred revenue Contract with Customer, Liability, Current Total current liabilities Liabilities, Current Capital lease obligation, non-current Capital Lease Obligations, Noncurrent Deferred rent, non-current Deferred Rent Credit, Noncurrent Other non-current liabilities Other Liabilities, Noncurrent Total liabilities Liabilities Commitments and contingencies (Note 7) Commitments and Contingencies Stockholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Preferred stock Preferred Stock, Value, Issued Common stock Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Accumulated deficit Retained Earnings (Accumulated Deficit) Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Total stockholders’ equity Stockholders' Equity Attributable to Parent Total liabilities and stockholders’ equity Liabilities and Equity Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Controlling Shareholders Majority Shareholder [Member] Affiliated Entity Affiliated Entity [Member] Related Party Transaction [Axis] Related Party Transaction [Axis] Related Party Transaction [Domain] Related Party Transaction [Domain] Dropbox Charitable Foundation Dropbox Charitable Foundation [Member] Dropbox Charitable Foundation [Member] Infrastructure Equipment Under Capital Leases and Commercial Products and Services Infrastructure Equipment Under Capital Leases And Commercial Products And Services [Member] Infrastructure Equipment Under Capital Leases And Commercial Products And Services [Member] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Number of controlling shareholders in related party transaction Related Party Transaction, Number Of Controlling Shareholders Related Party Transaction, Number Of Controlling Shareholders Payments to related party Related Party Transaction, Amounts of Transaction Capital lease remaining obligation Capital Lease Obligations Cash, Cash Equivalents and Short-Term Investments Cash, Cash Equivalents, and Short-term Investments [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] Restricted Stock Restricted Stock [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Number of shares available for issuance under the Plans Share-based Compensation Arrangement By Share-based Payment Award, Shares Available For Issuance [Roll Forward] Share-based Compensation Arrangement By Share-based Payment Award, Shares Available For Issuance [Roll Forward] Beginning balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Reserved for issuance under the 2018 Plan (in shares) Common Stock, Capital Shares Reserved for Future Issuance Additional shares authorized (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized Options and RSUs canceled (in shares) Share-based Compensation Arrangement By Share-based Payment Award, Shares Canceled Share-based Compensation Arrangement By Share-based Payment Award, Shares Canceled Shares repurchased for tax withholdings on release of restricted stock (unaudited) (in shares) Shares Paid for Tax Withholding for Share Based Compensation Restricted stock granted (in shares) Share-Based Compensation Arrangement By Share-based Payment Award, Decrease In Number of Shares Authorized From Stock Granted Share-Based Compensation Arrangement By Share-based Payment Award, Decrease In Number of Shares Authorized From Stock Granted Ending balance (in shares) Options Outstanding, Number of shares outstanding under the Plans Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Beginning balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Options exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Ending balance (in shares) Vested during period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares Unvested at end of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares Options Outstanding, Weighted- average exercise price per share Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Beginning balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Options exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Ending balance (in dollars per share) Vested during period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Weighted Average Grant Date Fair Value Unvested at end of period (in dollars per shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value Options Outstanding, Weighted- average remaining contractual term (In years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Weighted-average contractual term Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Vested during period Share-based Compensation Arrangement By Share-based Payment Award, Options, Vested, Weighted Average Remaining Contractual Term Share-based Compensation Arrangement By Share-based Payment Award, Options, Vested, Weighted Average Remaining Contractual Term Restricted Stock Outstanding, Number of Plan shares outstanding Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Beginning balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number RSUs released (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period RSUs canceled (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Restricted stock granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Ending balance (in shares) Unvested at end of period (in shares) Restricted Stock Outstanding, Weighted- average grant date fair value per share Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Beginning balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value RSUs released (in dollars 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 RSUs canceled (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Restricted stock granted (in dollars 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 Ending balance (in dollars per share) Unvested at end of period (in dollars per share) Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Buildings Building [Member] Datacenter and other computer equipment Computer Equipment [Member] Office equipment and other Office Equipment [Member] Property and equipment, useful life Property, Plant and Equipment, Useful Life Goodwill and Intangible Assets Disclosure [Abstract] Goodwill impairment Goodwill, Impairment Loss Schedule of Property and Equipment, Net Property, Plant and Equipment [Table Text Block] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Co-Founder Grants Co-Founder Grants [Member] Co-Founder Grants [Member] Stock Conversion Description [Axis] Stock Conversion Description [Axis] Conversion of Stock, Name [Domain] Conversion of Stock, Name [Domain] Conversion of Convertible Preferred Stock to Class B Common Stock Conversion Of Convertible Preferred Stock To Class B Common Stock [Member] Conversion Of Convertible Preferred Stock To Class B Common Stock [Member] Conversion of Convertible Preferred Stock to Class A Common Stock Conversion Of Convertible Preferred Stock To Class A Common Stock [Member] Conversion Of Convertible Preferred Stock To Class A Common Stock [Member] Votes per share Common Stock, Vote Equivalent Common Stock, Vote Equivalent Common stock, shares authorized (in shares) Common Stock, Shares Authorized Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares issued (in shares) Common Stock, Shares, Issued Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Shares converted in conversion (in shares) Conversion of Stock, Shares Converted Shares issued in conversion (in shares) Conversion of Stock, Shares Issued Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Shares granted (in shares) Statement of Cash Flows [Abstract] Cash flow from operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] 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 Deprecation, Depletion And Amortization (Excluding Amortization Of Deferred Sales Commissions Deprecation, Depletion And Amortization (Excluding Amortization Of Deferred Sales Commissions Stock-based compensation Share-based Compensation Amortization of deferred commissions Amortization of Deferred Sales Commissions Other Other Noncash Income (Expense) Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Trade and other receivables, net Increase (Decrease) in Accounts and Other Receivables Prepaid expenses and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Other assets Increase (Decrease) in Other Operating Assets Accounts payable Increase (Decrease) in Accounts Payable Accrued and other current liabilities Increase (Decrease) In Accrued Liabilities and Other Liabilities Increase (Decrease) In Accrued Liabilities and Other Liabilities Accrued compensation and benefits Increase (Decrease) in Employee Related Liabilities Deferred revenue Increase (Decrease) in Deferred Revenue Non-current liabilities Increase (Decrease) in Other Noncurrent Liabilities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash flow from investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Capital expenditures Payments to Acquire Property, Plant, and Equipment Purchases of intangible assets Payments to Acquire Intangible Assets Cash received from equipment rebates Proceeds From Equipment Rebates Proceeds From Equipment Rebates Purchases of short-term investments Payments to Acquire Available-for-sale Securities, Debt Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Cash flow from financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds from initial public offering and private placement, net of underwriters' discounts and commissions Proceeds from Issuance Initial Public Offering Payments of deferred offering costs Payments of Stock Issuance Costs Shares repurchased for tax withholdings on release of restricted stock Payments Related to Tax Withholding for Share-based Compensation Principal payments against capital lease obligations Repayments of Long-term Capital Lease Obligations Other Proceeds from (Payments for) Other Financing Activities Net cash provided by (used in) 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 and Cash Equivalents Change in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents—beginning of period Cash and cash equivalents—end of period Supplemental cash flow data: Supplemental Cash Flow Information [Abstract] Non-cash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Property and equipment acquired under capital leases Capital Lease Obligations Incurred Schedule of Cash, Cash Equivalents and Short-Term Investments Cash, Cash Equivalents and Investments [Table Text Block] Contractual Maturities of Short Term Investments Investments Classified by Contractual Maturity Date [Table Text Block] Debt Disclosure [Abstract] Line of Credit Facility [Table] Line of Credit Facility [Table] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Credit And Guarantee Agreement Credit And Guarantee Agreement [Member] Credit And Guarantee Agreement [Member] 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] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Credit Facility Revolving Credit Facility [Member] Letter of Credit Letter of Credit [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] LIBOR London Interbank Offered Rate (LIBOR) [Member] Base Rate Base Rate [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Line of credit facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Debt issuance fees Debt Issuance Costs, Line of Credit Arrangements, Gross Debt instrument, term Debt Instrument, Term Line of credit facility, accordion feature, increase limit Line Of Credit Facility, Accordion Feature, Increase Limit Line of Credit Facility, Accordion Feature, Increase Limit Unused capacity, commitment fee percentage Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Commitment fee percentage Line of Credit Facility, Commitment Fee Percentage Fronting fee Line Of Credit Facility, Fronting Fee Percentage Line Of Credit Facility, Fronting Fee Percentage Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Covenant terms, minimum liquidity balance Line Of Credit Facility, Covenant Terms, Liquidity Ratio Required, Minimum Line Of Credit Facility, Covenant Terms, Liquidity Ratio Required, Minimum Aggregate letters of credit outstanding amount Letters of Credit Outstanding, Amount Remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Net Loss Per Share Earnings Per Share [Text Block] 2018 Plan 2018 Plan [Member] 2018 Plan [Member] Employee Stock Option Employee Stock Option [Member] Expiration period Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Number of shares reserved for future issuance (in shares) Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Options granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Additional shares available for grant (in shares) Shares issued and outstanding (in shares) Shares available for grant (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Remaining unamortized stock-based compensation Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Unamortized stock-based compensation, requisite service period Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Revolving Credit Facility Debt Disclosure [Text Block] Segment Reporting [Abstract] Geographic Areas Segment Reporting Disclosure [Text Block] Fair Value Measurements Fair Value Disclosures [Text Block] Long-lived Assets by Geographic Areas Long-lived Assets by Geographic Areas [Table Text Block] Revenue by Geographic Areas Revenue from External Customers by Geographic Areas [Table Text Block] Conversion of Stock [Table] Conversion of Stock [Table] Private Placement Private Placement [Member] Convertible preferred stock Conversion of Class B Common Stock to Class A Common Stock Conversion Of Class B Common Stock To Class A Common Stock [Member] Conversion Of Class B Common Stock To Class A Common Stock [Member] Two-Tier RSUs Two-Tier Restricted Stock Units (RSUs) [Member] Two-Tier Restricted Stock Units (RSUs) [Member] Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] One-Tier RSU One-Tier Restricted Stock Units (RSUs) [Member] One-Tier Restricted Stock Units (RSUs) [Member] Title of Individual [Axis] Title of Individual [Axis] Relationship to Entity [Domain] Relationship to Entity [Domain] Chief Executive Officer Chief Executive Officer [Member] Director Director [Member] Vesting [Axis] Vesting [Axis] Vesting [Domain] Vesting [Domain] Tranche One Share-based Compensation Award, Tranche One [Member] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Customer Concentration Risk Customer Concentration Risk [Member] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Trade and Other Receivables Accounts Receivable And Other Receivable [Member] Accounts Receivable And Other Receivable [Member] Customer [Axis] Customer [Axis] Customer [Domain] Customer [Domain] Customer A Customer A [Member] Customer A [Member] Customer B Customer B [Member] Customer B [Member] Capitalized Contract Cost [Axis] Capitalized Contract Cost [Axis] Capitalized Contract Cost [Domain] Capitalized Contract Cost [Domain] Incremental Costs Incremental Costs [Member] Incremental Costs [Member] Deferred Commissions Deferred Commissions [Member] Deferred Commissions [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Prepaid Expenses and Other Current Assets Prepaid Expenses and Other Current Assets [Member] Other Assets Other Noncurrent Assets [Member] Infrastructure Equipment Infrastructure Equipment [Member] Infrastructure Equipment [Member] Change in Accounting Estimate by Type [Axis] Change in Accounting Estimate by Type [Axis] Change in Accounting Estimate, Type [Domain] Change in Accounting Estimate, Type [Domain] Change in Accounting Method Accounted for as Change in Estimate Change in Accounting Method Accounted for as Change in Estimate [Member] Conversion of Stock [Line Items] Conversion of Stock [Line Items] Stock issued in IPO (in shares) Stock Issued During Period, Shares, New Issues Share price of stock issued in IPO (in dollars per share) Shares Issued, Price Per Share Proceeds from initial public offering and private placement Offering costs Share price of stock sold in shares) Sale of Stock, Price Per Share Recognized cumulative unrecognized stock-based compensation Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost Shares released (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number Employer related payroll expense Labor and Related Expense Reverse stock split ratio Stockholders' Equity Note, Stock Split, Conversion Ratio Net foreign currency transaction gain Foreign Currency Transaction Gain (Loss), before Tax Revenue recognized Contract with Customer, Liability, Revenue Recognized Number of award types Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Award Types Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Award Types Number of tranches Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Tranches Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Tranches Shares granted (in dollars per share) Award requisite period Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period Concentration risk, percentage Concentration Risk, Percentage Non-trade receivables Nontrade Receivables, Current Deferred contract costs Capitalized Contract Cost, Net Deferred contract costs, amortization period Capitalized Contract Cost, Amortization Period Capitalized Contract Cost, Amortization Period Impairment loss related to deferred costs Capitalized Contract Cost, Impairment Loss Reduction in depreciation expense 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] Restricted stock units Options to purchase shares of common stock Shares subject to repurchase from early-exercised options and unvested restricted stock Shares Subject To Repurchase [Member] Shares Subject To Repurchase [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 Description of the Business and Summary of Significant Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Percentage vested maximum Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Weighted-average grant date fair value (in dollars per share) Property and Equipment, Net Property, Plant and Equipment Disclosure [Text Block] Capital lease commitments Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments, Fiscal Year Maturity [Abstract] 2018 Capital Leases, Future Minimum Payments, Remainder of Fiscal Year 2019 Capital Leases, Future Minimum Payments Due in Two Years 2020 Capital Leases, Future Minimum Payments Due in Three Years 2021 Capital Leases, Future Minimum Payments Due in Four Years 2022 Capital Leases, Future Minimum Payments Due in Five Years Thereafter Capital Leases, Future Minimum Payments Due Thereafter Future minimum payments Capital Leases, Future Minimum Payments Due Less interest and taxes Capital Leases, Future Minimum Payments, Interest Included in Payments Less current portion of the present value of minimum lease payments Capital lease obligations, net of current portion Operating lease commitments Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] 2018 Operating Leases, Future Minimum Payments, Remainder of Fiscal Year 2019 Operating Leases, Future Minimum Payments, Due in Two Years 2020 Operating Leases, Future Minimum Payments, Due in Three Years 2021 Operating Leases, Future Minimum Payments, Due in Four Years 2022 Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Future minimum payments Operating Leases, Future Minimum Payments Due Other commitments Other Commitment, Fiscal Year Maturity [Abstract] 2018 Other Commitments, Future Minimum Payments, Remainder of Fiscal Year 2019 Other Commitment, Due in Second Year 2020 Other Commitment, Due in Third Year 2021 Other Commitment, Due in Fourth Year 2022 Other Commitment, Due in Fifth Year Thereafter Other Commitment, Due after Fifth Year Future minimum payments Other Commitment Rent payments from sub-tenants Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals Schedule of Estimated Useful Lives of Property and Equipment Intrinsic value of options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] United States UNITED STATES International Non-US [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Total revenue Building Datacenter and other computer equipment Furniture and fixtures Furniture and Fixtures [Member] Leasehold improvements Leasehold Improvements [Member] Construction in process Construction in Progress [Member] Total property and equipment Accumulated depreciation and amortization Property and equipment, net Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Income tax expense Unrecognized tax benefits Unrecognized Tax Benefits Unrecognized tax benefits that would impact effective tax rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Estimated reduction in deferred tax assets due to remeasurement Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Change In Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense Estimated tax benefit from repealed corporate AMT Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Alternative Minimum Tax, Provisional Income Tax Benefit Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Alternative Minimum Tax, Provisional Income Tax Benefit Estimated transition tax inclusion Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Transition Tax For Accumulated Foreign Earnings, Provisional Income Tax Expense Tax Cuts And Jobs Act Of 2017, Incomplete Accounting, Transition Tax For Accumulated Foreign Earnings, Provisional Income Tax Expense Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Cost of revenue Cost of Sales [Member] Research and development Research and Development Expense [Member] Sales and marketing Selling and Marketing Expense [Member] General and administrative General and Administrative Expense [Member] Allocated share-based compensation expense Allocated Share-based Compensation Expense Schedule of Fair Value Assets Measured On Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Goodwill Goodwill Disclosure [Text Block]