Issuance of restricted stock awards (in shares) Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Document Type Document Type Class A shares in escrow subject to future vesting RSUs Subject To Future Vesting [Member] RSUs Subject To Future Vesting Aggregate intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Other expenses, net Other Nonoperating Income (Expense) Common Stock Net Loss Per Share Attributable to Common Stockholders Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Capped calls Option Indexed to Issuer's Equity [Line Items] Amortization of debt discount Amortization of Debt Discount (Premium) Deferred tax liability Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Schedule of identifiable finite-lived intangible assets Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] SEC Schedule, 12-09, Valuation Allowances and Reserves [Domain] Vested (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 Increase in shares available for grant (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized Level 3 Fair Value, Inputs, Level 3 [Member] Class A common stock reserved for Twilio.org Donor Advised Fund [Member] Donor-advised fund. Goodwill additions and adjustments Goodwill, Purchase Accounting Adjustments Debt issuance costs, gross Debt Issuance Costs, Gross Intangible Assets Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Statistical Measurement [Domain] Statistical Measurement [Domain] LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities and Equity [Abstract] Weighted average discount rate: Weighted Average Discount Rate [Abstract] Weighted Average Discount Rate [Abstract] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Percentage of revenue by geographic area: Risks and Uncertainties [Abstract] Schedule of accrued expenses and other current liabilities Schedule of Accrued Expenses and Other Current Liabilities [Table Text Block] Tabular disclosure of the components of accrued expenses and other current liabilities. Capitalized internal use software development costs Capitalized Computer Software, Additions Deferred tax liability Deferred Income Tax Liabilities, Net Amortization of assets Finance Lease, Right-of-Use Asset, Amortization Other long-term liabilities Increase (Decrease) in Other Noncurrent Liabilities Votes per share Common Stock, Votes per Share Number of votes per common share a shareholder is entitled. Debt instrument, liability component Debt Instrument, Liability Component Debt Instrument, Liability Component Security Exchange Name Security Exchange Name Intangible assets, net Total Intangible Assets, Net (Excluding Goodwill) Accrued cost of revenue Accrued Cost of Revenue, Current Accrued cost of revenue, current. Assets and Liabilities, Lessee Assets And Liabilities, Lessee [Table Text Block] Assets And Liabilities Lessee Table [Text Block] Term of non-cancellable lease Lessee, Noncancellable Operating Lease, Term Of Contract Lessee, Noncancellable Operating Lease, Term Of Contract Sales and marketing Selling and Marketing Expense [Member] Loss from operations Operating Income (Loss) Payments of debt issuance costs Payments of Debt Issuance Costs Total current liabilities Liabilities, Current Schedule of weighted average grant date fair value Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value [Table Text Block] Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Nonvested RSUs at the beginning of the period (in dollars per share) Nonvested RSUs at the end of the period (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 Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Commitments and contingencies (Note 12) Commitments and Contingencies Total lease payments Finance Lease, Liability, Payment, Due Value of equity awards withheld for tax liability Share-based Payment Arrangement, Decrease for Tax Withholding Obligation ASSETS Assets [Abstract] Investment, Name [Axis] Investment, Name [Axis] Finance lease cost: Lessee, Finance Lease, Description [Abstract] Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Accounting Policies [Abstract] Accounting Policies [Abstract] Furniture and fixtures Furniture and Fixtures [Member] Sales and other taxes payable Taxes Payable, Current Entity Address, State or Province Entity Address, State or Province Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Employee and nonemployee stock options Employee And Nonemployee Stock Option [Member] Employee and Nonemployee Stock Options. Term of non-cancellable agreement Unrecorded Unconditional Purchase Obligation, Term Operating cash flows from operating leases Operating Lease, Payments Accounts payable Accounts Payable, Current One to three years, aggregate fair value Available-for-sale Securities, Debt Maturities, Rolling Year Two, Fair Value Fair value of available-for-sale debt securities maturing in the second rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. Accumulated deficit Retained Earnings (Accumulated Deficit) Thereafter Lessee, Operating Lease, Liability, Payments Due After Year Four Lessee, Operating Lease, Liability, Payments Due After Year Four Operating right-of-use asset Operating lease assets Operating Lease, Right-of-Use Asset Unamortized discount Debt Instrument, Unamortized Discount Loss on extinguishment of debt Loss on extinguishment of debt Gain (Loss) on Extinguishment of Debt Accrued other expenses Other Accrued Liabilities, Noncurrent 2022 Lessee, Operating Lease, Liability, to be Paid, Year One Schedule of net carrying amount of the liability and equity components of the Notes Convertible Debt [Table Text Block] Common Stock Class B Common Class B [Member] Stock options issued and outstanding (in shares) Outstanding options as of the beginning of the period (in shares) Outstanding options as of the end of the period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 2022 Finance Lease, Liability, to be Paid, Year One 2025 Lessee, Operating Lease, Liability, to be Paid, Year Four Total Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Preferred stock Preferred Stock, Value, Issued Trading price as a percentage of the product of common stock sale price and conversion rate Debt Instrument, Conversion Eligibility Based on Debt Trading Price, Threshold Percentage for Eligibility The trading price of a specified principal amount of the debt instrument as a percent of the product of the last reported sale price of the equity security into which conversion will be made and the conversion rate, below which conversion eligibility is triggered after a specified number of trading days. Total net lease cost Lease, Cost Total operating expenses Operating Expenses Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Schedule of other long-term liabilities Other Noncurrent Liabilities [Table Text Block] Costs related to public debt and equity offerings, accrued but not paid Costs Related To Public Debt And Equity Offerings, Accrued But Not Paid Costs Related To Public Debt And Equity Offerings, Accrued But Not Paid Other comprehensive loss: Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Other long-term liabilities Total other long-term liabilities Other Liabilities, Noncurrent Acquired Finite-Lived Intangible Assets [Line Items] Acquired Finite-Lived Intangible Assets [Line Items] Financing cash flows from finance leases Finance Lease, Principal Payments Total estimated grant date fair value of options vested Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value Stock-based compensation APIC, Share-based Payment Arrangement, Increase for Cost Recognition Effect of exchange rate changes on cash, cash equivalents and restricted cash Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Revenue Revenue from Contract with Customer, Excluding Assessed Tax Aggregate intrinsic value (In thousands) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value [Abstract] Percentage of revenue (as a percent) Concentration Risk, Percentage Business Acquisition [Axis] Business Acquisition [Axis] Geographical [Domain] Geographical [Domain] Amortization of deferred commissions Capitalized Contract Cost, Amortization SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] Conversion ratio Debt Instrument, Convertible, Conversion Ratio Statement [Line Items] Statement [Line Items] Schedule of common stock equivalents excluded from the computation of the diluted net loss per share attributable to common stockholders Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Class of Stock [Domain] Class of Stock [Domain] Data center equipment Computer Equipment [Member] Acquisition related costs Business Combination, Acquisition Related Costs Statement [Table] Statement [Table] Write-offs Accounts Receivable, Allowance for Credit Loss, Writeoff Debt instrument, maximum redemption price as a percentage of principal 180 days after equity offer Debt Instrument, Maximum Redemption Price As A Percentage Of Principal 180 Days After Equity Offer Debt Instrument, Maximum Redemption Price As A Percentage Of Principal 180 Days After Equity Offer Statistical Measurement [Axis] Statistical Measurement [Axis] Preferred stock, issued (in shares) Preferred Stock, Shares Issued Expected volatility, low end of range (as a percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum Business Combinations [Abstract] Business Combinations [Abstract] Entity Small Business Entity Small Business Principles of Consolidation Consolidation, Policy [Policy Text Block] Purchase commitment Unrecorded Unconditional Purchase Obligation Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Shares sold in offering (in shares) Sale of Stock, Number of Shares Issued in Transaction Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Cost of revenue Cost of Revenue Redemption Period One Debt Instrument, Redemption, Period One [Member] Goodwill Goodwill [Roll Forward] Property and Equipment Property, Plant and Equipment, Net, by Type [Abstract] Amendment Flag Amendment Flag Schedule of the calculation of basic and diluted net loss per share attributable to common stockholders Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Options vested and exercisable and options vested and expected to vest Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract] Valuation Assumptions Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Initial cap price (in dollars per share) Option Indexed To Issuer's Equity, Cap Price Cap price stated in the contract for options indexed to the issuer's equity shares. Right-of-Use Asset and Lease Liabilities Lessee, Finance Leases [Text Block] Schedule of purchase price allocation Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Schedule of financial assets measured at fair value on a recurring basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Stock-based awards available for grant under 2016 Plan (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Accrued other expense Other Accrued Liabilities, Current Value of donated common stock Common Stock, Donor Advised Fund, Value Common Stock, Donor Advised Fund, Value Supplemental Balance Sheet Information Supplemental Balance Sheet Disclosures [Text Block] Total lease liabilities Lease, Liability Lease Liability Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Entity Central Index Key Entity Central Index Key Accrued expenses and other current liabilities Total accrued expenses and other current liabilities Accrued Liabilities and Other Liabilities, Current Accrued expenses and other current liabilities. Short-term marketable securities Debt Securities, Available-for-sale, Current Finance lease liability, current Deferred Rent Credit, Current Capitalized software development costs Payments to Develop Software Financial Instruments [Domain] Financial Instruments [Domain] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Redemption Period Three Debt Instrument, Redemption, Period Three [Member] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Shares subject to future vesting conditions, weighted average grant date fair value (in dollars per share) Stock Issued During Period, Shares Subject To Future Vesting Conditions, Weighted Average Grant Date Fair Value Stock Issued During Period, Shares Subject To Future Vesting Conditions, Weighted Average Grant Date Fair Value Senior Notes Senior Notes [Member] Geographical [Axis] Geographical [Axis] Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table] Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table] Additions SEC Schedule, 12-09, Valuation Allowances and Reserves, Additions, Charge to Other Account Maturity Of Finance Lease Liabilities Finance Lease, Liability, Payment, Due, Rolling Maturity [Abstract] Schedule of intangible assets Schedule of Intangible Assets, Excluding Goodwill [Table Text Block] Tabular disclosure of intangible assets, excluding goodwill, which may be broken down by segment or major class. Total amortized cost Debt Securities, Available-for-sale, Amortized Cost Unvested stock options Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount Renewal option Lessee, Operating Lease, Renewal Term Capped calls Capped Call Option [Member] Capped call options covering shares of the entity's Class A Common Stock, intended to reduce or offset potential dilution resulting from the conversion of convertible senior notes. Gross Unrealized Gains Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Conversion of shares of Class B common stock into shares of Class A common stock Conversion of Stock, Amount Converted Net proceeds from the debt offering Proceeds from Debt, Net of Issuance Costs Property, Plant and Equipment, Type [Axis] Long-Lived Tangible Asset [Axis] Convertible senior notes, 0.25%, due 2023 Convertible Senior Notes0.25 Percent Due2023 [Member] Represents convertible senior notes that bear an interest rate of 0.25 percent and will mature in 2023. Class A common stock committed under 2016 ESPP Employee Stock [Member] Balance, beginning of period Balance, end of period SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount Balance, beginning of period Balance, end of period Accounts Receivable, Allowance for Credit Loss, Current Income Statement Location [Axis] Income Statement Location [Axis] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Income Statement Location [Domain] Income Statement Location [Domain] 2023 Lessee, Operating Lease, Liability, to be Paid, Year Two CASH FLOWS FROM FINANCING ACTIVITIES: Net Cash Provided by (Used in) Financing Activities [Abstract] Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] Accrued bonus and commission Accrued Bonuses, Current Thereafter Finite-Lived Intangible Asset, Expected Amortization, after Year Four Finite-Lived Intangible Asset, Expected Amortization, after Year Four Amortization expense Amortization of Intangible Assets Lease, Cost Lease, Cost [Table Text Block] 2024 Lessee, Operating Lease, Liability, to be Paid, Year Three Other long-term assets Other Assets, Noncurrent Plan Name [Axis] Plan Name [Axis] Minimum sale price of stock as a percentage of the conversion price Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger Issuance of common stock in connection with a follow-on public offering, net of underwriter discounts Stock Issued During Period, Value, New Issues Cash and cash equivalents: Cash and Cash Equivalents, Fair Value Disclosure Value of common stock issued to settle convertible senior notes Debt Conversion, Converted Instrument, Amount Concentration Risk [Table] Concentration Risk [Table] Operating cash flows from finance leases (interest) Finance Lease, Interest Payment on Liability Total assets Assets Revenue from Contract with Customer Benchmark Revenue from Contract with Customer Benchmark [Member] Total interest expense Interest Expense, Debt Summary of Significant Accounting Policies Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Nonvested restricted stock units issued and outstanding (in shares) Nonvested RSUs at the beginning of the period (in shares) Nonvested RSUs at the end of the period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Title of 12(b) Security Title of 12(b) Security Order backlog Order or Production Backlog [Member] Redemption Period Six Debt Instrument, Redemption, Period Six [Member] Debt Instrument, Redemption, Period Six Net Finite-Lived Intangible Assets, Net Weighted-average grant date fair value per share of options granted (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Antidilutive Securities [Axis] Antidilutive Securities [Axis] Cost of revenue Cost of Sales [Member] Concentration of Credit Risk Concentration Risk, Credit Risk, Policy [Policy Text Block] Finance Lease, Liability, Maturity Finance Lease, Liability, Fiscal Year Maturity [Table Text Block] Aggregate proceeds from stock offering Sale of Stock, Consideration Received on Transaction Depreciation and amortization Depreciation, Depletion and Amortization Total liabilities Liabilities Weighted-average period (in years) Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition International Non-US [Member] Less: imputed interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Stockholders' Equity Class of Stock Disclosures [Abstract] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Net loss attributable to common stockholders Net loss Net loss attributable to common stockholders (in thousands) Net Income (Loss) Available to Common Stockholders, Basic Level 1 Fair Value, Inputs, Level 1 [Member] Options vested and exercisable - weighted-average remaining contractual term Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term Schedule of unrecognized compensation Schedule of Deferred Compensation Arrangement with Individual, Share-based Payments [Table Text Block] Class A common stock reserved for Twilio.org (in shares) Common Stock, Capital Shares Reserved for Future Issuance, Donor-advised Fund Number of common shares reserved for issuance in relation to a donor-advised fund. Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Number of consecutive trading days of threshold Notes trading price for conversion eligibility to follow Debt Instrument, Conversion Eligibility Based on Debt Trading Price, Consecutive Trading Days Number of consecutive trading days for which the trading price of the debt must meet specified criteria to trigger conversion eligibility for a number of trading days following this consecutive trading day period. Accounts payable Increase (Decrease) in Accounts Payable Number of awards outstanding Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Outstanding RSUs, aggregate intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Outstanding Donated common stock (in shares) Stock Issued During Period, Shares, Donor Advised Fund Stock Issued During Period, Shares, Donor Advised Fund Debt Instrument [Axis] Debt Instrument [Axis] Additional Paid-In Capital Additional Paid-in Capital [Member] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Other adjustments Other Operating Activities, Cash Flow Statement Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Class of Stock [Line Items] Class of Stock [Line Items] Acquisitions Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill [Abstract] Accrued expenses and other current liabilities Increase (Decrease) in Accrued Liabilities Finance lease accumulated depreciation Lessee, Finance Lease, Accumulated Depreciation Finance Lease Accumulated Depreciation Balance (in shares) Balance (in shares) Shares, Issued Accrued Expenses and Other Liabilities Accrued Liabilities and Other Liabilities Disclosure [Text Block] The entire disclosure for accrued expenses and other liabilities. Interest on lease liabilities Finance Lease, Interest Expense Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Unrealized loss on marketable securities Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Proceeds from a public equity offering Proceeds From A Public Equity Offering Proceeds From A Public Equity Offering Common stock, outstanding (in shares) Common Stock, Shares, Outstanding Entity Information [Line Items] Entity Information [Line Items] Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Variable lease cost Variable Lease, Cost Senior Notes 3.525 Percent Due 2029 Senior Notes 3.625 Percent Due 2029 [Member] Senior Notes 3.625 Percent Due 2029 Loss before provision for income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Options vested and exercisable - weighted-average exercise price (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price Loss Contingency Nature [Axis] Loss Contingency Nature [Axis] Adjustments to reconcile net loss to net cash provided by operating activities: Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Research and development Research and Development Expense Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Outstanding options as of the beginning of the period (in dollars per share) Outstanding options as of the end of the period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Common stock, authorized (in shares) Common Stock, Shares Authorized Acquisitions, net of cash acquired and other related payments Payments to Acquire Businesses, Net of Cash Acquired Concentration Risk Type [Axis] Concentration Risk Type [Axis] Proceeds from exercises of stock options and shares issued in ESPP Proceeds from Stock Options Exercised Impairment of long-lived assets Impairment of Long-Lived Assets Held-for-use SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] SEC Schedule, 12-09, Valuation Allowances and Reserves Type [Axis] Less than one year, amortized cost Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Rolling within One Year, Amortized Cost Contractual interest expense Interest Expense, Debt, Excluding Amortization Aggregate Fair Value Estimate of Fair Value Measurement [Member] Income Statement [Abstract] Income Statement [Abstract] Accumulated Other Comprehensive Income AOCI Attributable to Parent [Member] Convertible senior notes, 0.25%, due 2023 - over-allotment Convertible Senior Notes0.25 Percent Due2023 Over Allotment [Member] Represents convertible senior notes that bear an interest rate of 0.25 percent and will mature in 2023, issued pursuant to the exercise of the over-allotment options of the initial purchasers. Schedule of contractual maturities of marketable securities Investments Classified by Contractual Maturity Date [Table Text Block] Operating lease liability, noncurrent Operating Long-term lease obligations Operating Lease, Liability, Noncurrent 2025 Finite-Lived Intangible Asset, Expected Amortization, Year Four Prepaid expenses and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles Operating lease liabilities Increase (Decrease) In Operating Lease Liability Increase (Decrease) In Operating Lease Liability Use of Estimates Use of Estimates, Policy [Policy Text Block] Current assets: Assets, Current [Abstract] Interest earned on marketable securities Investment Income, Interest Comprehensive loss attributable to common stockholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent Sales credit reserve Contract With Customer Liability Promotions [Member] Liability for certain customer discounts and rewards for which consideration for transfer good or service has been received or is receivable. 2024 Finance Lease, Liability, to be Paid, Year Three Dividend rate (as a percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Patent Patents [Member] Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Class A common stock in escrow Class A Common Stock Held In Escrow [Member] Class A Common Stock Held In Escrow Net Loss Per Share Attributable to Common Stockholders Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Deductions against reserve SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction Purchases of long-lived and intangible assets Payments to Acquire Property, Plant, and Equipment City Area Code City Area Code Net cost to purchase the transactions Payments for Capped Call Options The cash outflow for the purchase of capped call options, not accounted for as derivatives. Document Period End Date Document Period End Date Percentage of revenue Allowance For Doubtful Account, Percent Of Revenue Allowance For Doubtful Account, Percent Of Revenue Notes Payable Long-term Debt [Text Block] Senior Notes 3.875 Percent Due 2031 Senior Notes 3.875 Percent Due 2031 [Member] Senior Notes 3.875 Percent Due 2031 Goodwill and Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Abstract] Amount accrued Loss Contingency Accrual Gross Unrealized Losses Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss Total (in shares) Common Stock, Capital Shares Reserved for Future Issuance Net loss Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Schedule of revenue by geographic area Disaggregation of Revenue [Table Text Block] Term of lease Lessee, Operating Lease, Term of Contract Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Proceeds from issuance of senior notes Proceeds from Issuance of Senior Long-term Debt Option Indexed to Issuer's Equity, Type [Domain] Option Indexed to Issuer's Equity, Type [Domain] Stock-based compensation capitalized in software development costs Share-based Payment Arrangement, Amount Capitalized Stock-based compensation Share-based Payment Arrangement, Noncash Expense Acquisition holdback Business Combination, Consideration Holdback , Non-Current Carrying amount as of the balance sheet date pertaining to business combination consideration withheld by the entity and expected to be paid after one year (or the normal operating cycle, if longer), from the balance sheet date. Value of equity awards withheld for tax liabilities Payment, Tax Withholding, Share-based Payment Arrangement Vesting of restricted stock units (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Gross Cover [Abstract] Cover [Abstract] Maturity Of Operating Lease Liabilities Lessor, Operating Lease, Payments, Fiscal Year Maturity [Abstract] Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Costs related to proposed investment in Syniverse, accrued but not paid Costs Related To Proposed Investment, Accrued But Not Paid Costs Related To Proposed Investment, Accrued But Not Paid Long-term debt Long-term Debt Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Deferred revenue and customer deposits Increase (Decrease) in Contract with Customer, Liability Right-of-Use Asset and Lease Liabilities Lessee, Operating Leases [Text Block] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Net amortization of investment premium and discount Accretion (Amortization) of Discounts and Premiums, Investments Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Customer relationships Customer Relationships [Member] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Cash paid for amounts included in the measurement of lease liabilities: Lease, Cost [Abstract] Marketable securities, aggregate fair value Total aggregate fair value Debt Securities, Available-for-sale Equity Components [Axis] Equity Components [Axis] RSAs Restricted Stock [Member] Share-based Payment Arrangement [Abstract] Share-based Payment Arrangement [Abstract] Deferred costs Deferred Costs Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Receivables [Abstract] Receivables [Abstract] Minimum Minimum [Member] Debt instrument, minimum redemption price as a percentage of principal outstanding Debt Instrument, Minimum Redemption Price As A Percentage Of Principal Outstanding Debt Instrument, Minimum Redemption Price As A Percentage Of Principal Outstanding Property and equipment, net Total property and equipment, net Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Operating lease liability, current Operating Less: current obligations Operating Lease, Liability, Current Unrecognized compensation cost, other than options Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Unvested restricted stock units and awards issued and outstanding (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number Forfeited and 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 Schedule of valuation assumptions, options Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Entity Interactive Data Current Entity Interactive Data Current United States UNITED STATES Exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Revenues: Revenues [Abstract] Fair Value Measurements Fair Value Disclosures [Text Block] CASH FLOWS FROM OPERATING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities [Abstract] Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] Non-cash reduction to the right-of-use asset Leases, Right-Of-Use Asset, Amortization Leases, Right-Of-Use Asset, Amortization Schedule of stock options activity Share-based Payment Arrangement, Option, Activity [Table Text Block] Proceeds from sales and maturities of marketable securities Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-sale Schedule of the sales credit reserve Sales Credit Reserve [Table Text Block] Tabular disclosure of the sales credit reserve. 2021 (remaining nine months) Finite-Lived Intangible Asset, Expected Amortization, Remainder of Fiscal Year Sales credit reserve SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] Purchases of property and equipment through finance leases Purchases Of Property Equipment Through Financing Lease Purchases Of Property Equipment Through Financing Lease Additional paid-in capital Additional Paid in Capital, Common Stock Entity Registrant Name Entity Registrant Name Stock Based Compensation Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized [Abstract] Financial Assets, Amortized Cost or Carrying Value Financial Assets, Amortized Cost or Carrying Value The aggregate of carrying value for assets with carrying value that approximates fair value and amortized cost basis for assets carried at fair value. Business Acquisition [Line Items] Business Acquisition [Line Items] Business Acquisition [Line Items] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Concentration Risk [Line Items] Concentration Risk [Line Items] Operating leases (as a percent) Operating Lease, Weighted Average Discount Rate, Percent Fair Value Measurements, Financial Assets Assets, Fair Value Disclosure [Abstract] Debt conversion, converted instrument, amount including cash Debt Conversion, Converted Instrument, Amount Including Cash Debt Conversion, Converted Instrument, Amount Including Cash Options vested and exercisable - number of options outstanding (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number Allowance for doubtful accounts Accounts Receivable, Allowance for Credit Loss [Roll Forward] Unamortized issuance costs Debt Issuance Costs, Net Weighted- average exercise price (Per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Intangible assets, gross Intangible Assets, Gross (Excluding Goodwill) Percentage of revenue Sales Credit Reserve, Percent Of Revenue Sales Credit Reserve, Percent Of Revenue Performance-based stock options Performance Based Employee Stock Options [Member] Performance-based stock options awarded to employees. 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Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. 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Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] 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 Forfeited and cancelled (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Interest expense recognized related to the Notes Interest Expense, Debt [Abstract] Sale of Stock [Domain] Sale of Stock [Domain] Loss Contingencies [Table] Loss Contingencies [Table] Carrying Value Reported Value Measurement [Member] Plan Name [Domain] Plan Name [Domain] 2016 Stock Option and Incentive Plan Stock Option And Incentive Plan2016 [Member] 2016 Stock Option and Incentive Plan. 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Recently Issued Accounting Guidance, Not yet Adopted New Accounting Pronouncements, Policy [Policy Text Block] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract]