Commitments and Contingencies Disclosure [Abstract] Schedule of Lease Information Lease, Cost [Table Text Block] Schedule of Undiscounted Future Lease Payments Lessee, Operating Lease, Liability, Maturity [Table Text Block] Business Combinations [Abstract] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Liability Class [Axis] Liability Class [Axis] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Contingent earn-out Contingent Earn-Out [Member] Contingent Earn-Out [Member] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] AdvantageTec AdvantageTec Inc [Member] AdvantageTec Inc [Member] Conversable, Inc. Conversable Inc [Member] Conversable Inc [Member] BotCentral BotCentral [Member] BotCentral [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Aggregate purchase price Business Combination, Consideration Transferred Cash payment in acquisition Payments to Acquire Businesses, Gross Equity consideration in acquisition Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Potential earn-out consideration payments based on achieving targets Potential Earn-Out Contingent Consideration Payments, Target Based Potential Earn-Out Contingent Consideration Payments, Target Based Re-measurement to fair value Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Fair Value Adjustments Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Fair Value Adjustments Contingent earn-out Business Combination, Contingent Consideration, Liability, Current Payments related to contingent consideration Payment for Contingent Consideration Liability, Financing Activities Goodwill acquired in acquisition Goodwill, Acquired During Period Intangible assets acquired Finite-lived Intangible Assets Acquired Business acquisition transaction costs Business Acquisition, Transaction Costs Assets acquired and liabilities assumed, net liability Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Share-based Payment Arrangement [Abstract] Share-based Payment Arrangement, Option, Exercise Price Range [Table] Share-based Payment Arrangement, Option, Exercise Price Range [Table] Exercise Price Range [Axis] Exercise Price Range [Axis] Exercise Price Range [Domain] Exercise Price Range [Domain] $5.15 - $7.60 Exercise Price Range One [Member] Exercise Price Range One [Member] $7.95 - $10.05 Exercise Price Range Two [Member] Exercise Price Range Two [Member] $10.13 - $11.95 Exercise Price Range Three [Member] Exercise Price Range Three [Member] $11.96 - $12.32 Exercise Price Range Four [Member] Exercise Price Range Four [Member] $12.45 - $12.45 Exercise Price Range Five [Member] Exercise Price Range Five [Member] $12.46 - $14.3 Exercise Price Range Six [Member] Exercise Price Range Six [Member] $14.5 - $17.88 Exercise Price Range Seven [Member] Exercise Price Range Seven [Member] $18.09 - $28.18 Exercise Price Range Eight [Member] Exercise Price Range Eight [Member] $28.23 - $29.55 Exercise Price Range Nine [Member] Exercise Price Range Nine [Member] $29.55 - $29.55 Exercise Price Range Ten [Member] Exercise Price Range Ten [Member] Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] Exercise price range, minimum (in dollars per share) Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit Exercise price range, maximum (in dollars per share) Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit Options outstanding, Number of shares outstanding (in shares) Share-based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding Options outstanding, Weighted-average remaining contractual life Share-based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Remaining Contractual Term Options outstanding, Weighted-average exercise price (in dollars per share) Share-based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Exercise Price Options exercisable, Number of shares (in shares) Share-based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable Options exercisable, Weighted-average exercise price (in dollars per share) Share-based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price Income Statement [Abstract] Statement [Table] Statement [Table] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Cost of revenue Cost of Sales [Member] Sales and marketing Selling and Marketing Expense [Member] General and administrative General and Administrative Expense [Member] Product development Research and Development Expense [Member] Statement [Line Items] Statement [Line Items] Revenue Revenues Costs and expenses Costs and Expenses [Abstract] Cost of revenue Cost of Revenue Sales and marketing Selling and Marketing Expense General and administrative General and Administrative Expense Product development Research and Development Expense Restructuring costs Restructuring Charges Amortization of purchased intangibles Amortization of Intangible Assets Total costs and expenses Costs and Expenses Loss from operations Operating Income (Loss) Other expense, net Nonoperating Income (Expense) Loss before provision for income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Provision for income taxes Income Tax Expense (Benefit) Net loss Net Income (Loss) Attributable to Parent Net loss per share of common stock: Earnings Per Share [Abstract] Basic net loss per common share (in dollars per share) Earnings Per Share, Basic Diluted net loss per common share (in dollars per share) Earnings Per Share, Diluted Weighted-average shares used to compute net loss per share: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Weighted average shares outstanding used in basic net loss per common share calculation (in shares) Weighted Average Number of Shares Outstanding, Basic Weighted average shares outstanding used in diluted net loss per common share calculation (in shares) Weighted Average Number of Shares Outstanding, Diluted Additional Information on Operating Expenses Operating Expenses [Abstract] Stock-based compensation expense Share-based Payment Arrangement, Expense Depreciation expense Depreciation, Nonproduction Amortization of purchased intangibles Cost, Amortization Fair Value Disclosures [Abstract] Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Conversable, Inc. and AdvntageTec Conversable Inc And AdvntageTec Inc [Member] Conversable Inc And AdvntageTec Inc [Member] Measurement Frequency [Axis] Measurement Frequency [Axis] Measurement Frequency [Domain] Measurement Frequency [Domain] Recurring Fair Value, Recurring [Member] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Convertible senior note Senior Debt Obligations [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Convertible senior note net Convertible Debt, Fair Value Disclosures Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Period Increase (Decrease) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Period Increase (Decrease) Cash payment related to contingent consideration Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements Goodwill and Intangible Assets Disclosure [Abstract] Schedule of Goodwill [Table] Schedule of Goodwill [Table] Segments [Axis] Segments [Axis] Segment [Domain] Segments [Domain] Business Business [Member] Business [Member]. Consumer Consumer [Member] Consumer [Member] Goodwill [Line Items] Goodwill [Line Items] Goodwill [Roll Forward] Goodwill [Roll Forward] Goodwill, beginning balance Goodwill Foreign exchange adjustment Goodwill, Foreign Currency Translation Gain (Loss) Goodwill, ending balance Restructuring and Related Activities [Abstract] Restructuring Reserve [Roll Forward] Restructuring Reserve [Roll Forward] Balance, Beginning of the year Restructuring Reserve Severance and other associated costs Severance Costs Cash payments Payments for Restructuring Balance, End of period Statement of Financial Position [Abstract] 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 $2,894 and $2,276 as of September 30, 2019 and December 31, 2018, respectively Accounts Receivable, after Allowance for Credit Loss, Current Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Total current assets Assets, Current Operating lease right of use asset Operating Lease, Right-of-Use Asset Property and equipment, net Property, Plant and Equipment, Net Intangibles, net Intangible Assets, Net (Excluding Goodwill) Goodwill Deferred tax assets Deferred Tax Assets, Net of Valuation Allowance Other assets Other Assets, Noncurrent Total assets Assets LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities and Equity [Abstract] CURRENT LIABILITIES: Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Accrued expenses and other current liabilities Accrued Liabilities, Current Deferred revenue Contract with Customer, Liability, Current Operating lease liability Operating Lease, Liability, Current Total current liabilities Liabilities, Current Deferred revenue Contract with Customer, Liability, Noncurrent Convertible senior notes, net Convertible Notes Payable, Noncurrent Other liabilities Other Liabilities, Noncurrent Operating lease liability, net of current portion Operating Lease, Liability, Noncurrent Deferred tax liability Deferred Income Tax Liabilities, Net Total liabilities Liabilities Commitments and contingencies (see note 11 in the notes to the Condensed Consolidated Financial Statement) Commitments and Contingencies STOCKHOLDERS’ EQUITY: Stockholders' Equity Attributable to Parent [Abstract] Common stock, $0.001 par value - 100,000,000 shares authorized, 66,035,099 shares issued and outstanding and 63,676,229 shares issued and outstanding, respectively Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Treasury stock, at cost; 2,704,706 and 2,681,285 shares, respectively Treasury Stock, Value Accumulated deficit Retained Earnings (Accumulated Deficit) Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Total stockholders’ equity Stockholders' Equity Attributable to Parent Total liabilities and stockholders’ equity Liabilities and Equity Payables and Accruals [Abstract] Schedule of Accrued Expenses and Other Current Liabilities Schedule of Accrued Liabilities [Table Text Block] Revenue from Contract with Customer [Abstract] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Hosted Services - Business Hosted Services - Business [Member] Hosted Services - Business [Member] Professional Services Professional Services [Member] Professional Services [Member] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Recognition of deferred revenue Contract with Customer, Liability, Revenue Recognized Total deferred revenue - short term Total deferred revenue - long term Cover page. Document Type Document Type Document Quarterly Report Document Quarterly Report Document Period End Date Document Period End Date Document Transition Report Document Transition Report Entity File Number Entity File Number Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Tax Identification Number Entity Address, Address Line One Entity Address, Address Line One 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 Entity Current Reporting Status Entity Current Reporting Status Entity Interactive Data Current Entity Interactive Data Current Entity Filer Category Entity Filer Category Entity Small Business Entity Small Business Entity Emerging Growth Company Entity Emerging Growth Company Entity Shell Company Entity Shell Company Title of 12(b) Security Title of 12(b) Security Trading Symbol Trading Symbol Security Exchange Name Security Exchange Name Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Amortization Amortization Segment Reporting [Abstract] 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 Israel ISRAEL Australia AUSTRALIA Netherlands NETHERLANDS Other United Kingdom, Germany, Japan, France, Italy [Member] United Kingdom, Germany, Japan, France, Italy [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Total long-lived assets Long-Lived Assets Option-Pricing Model Weighted Average Assumptions Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Dividend yield (percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Risk-free interest rate (percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Risk-free interest rate, minimum (percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum Risk-free interest rate, maximum (percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum Expected life (in years) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Historical volatility (percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Historical volatility, minimum (percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum Historical volatility, maximum (percent) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum Accounts receivable, allowance for doubtful accounts Accounts Receivable, Allowance for Credit Loss, Current Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares authorized (in shares) Common Stock, Shares Authorized Common stock, shares issued (in shares) Common Stock, Shares, Issued Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding Treasury stock (in shares) Treasury Stock, Common, Shares Statement of Stockholders' Equity [Abstract] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock Common Stock [Member] Treasury Stock Treasury Stock [Member] Additional Paid-in Capital Additional Paid-in Capital [Member] Accumulated Deficit Retained Earnings [Member] Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning balance Beginning balance (in shares) Common stock issued upon exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Common stock issued upon exercise of stock options (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Common stock issued upon vesting of restricted stock units Stock Issued During Period, Value, New Issues Common stock issued upon vesting of restricted stock units (in shares) Stock Issued During Period, Shares, New Issues Stock-based compensation APIC, Share-based Payment Arrangement, Increase for Cost Recognition Common stock issued under Employee Stock Purchase Plan Stock Issued During Period, Value, Employee Stock Purchase Plan Common stock issued under Employee Stock Purchase Plan (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Common stock repurchase Stock Repurchased During Period, Value Common stock repurchase (in shares) Stock Repurchased During Period, Shares ASC 606 prior period adjustment (see note 1) Cumulative Effect on Retained Earnings, Net of Tax Issuance of common stock in connection with acquisitions Stock Issued During Period, Value, Acquisitions Issuance of common stock in connection with acquisitions (in shares) Stock Issued During Period, Shares, Acquisitions Equity component of convertible senior notes Debt Conversion Options Issued During Period Debt Conversion Options Issued During Period Equity component of convertible senior notes issuance costs Adjustments to Additional Paid in Capital, Debt Conversion Option, Issuance Costs Amount of decrease in additional paid in capital (APIC) resulting from direct costs associated with issuing debt conversion option. Includes, but is not limited to, legal and accounting fees and other direct costs of issuance. Purchase of capped call option Adjustments to Additional Paid in Capital, Capped Call Option, Issuance Costs Amount of decrease in additional paid in capital (APIC) resulting from direct costs associated with issuing capped call options. Includes, but is not limited to, legal and accounting fees and direct costs associated with issuance. Net loss Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Ending balance Ending balance (in shares) Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] Common stock to be authorized pending charter amendment Common Stock, Shares Authorized Pending Charter Amendment Common Stock, Shares Authorized Pending Charter Amendment Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] Preferred stock, shares authorized (in shares) Preferred Stock, Shares Authorized Preferred stock, shares issued (in shares) Preferred Stock, Shares Issued Preferred stock, shares outstanding (in shares) Preferred Stock, Shares Outstanding Preferred stock, par value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Statistical Measurement [Axis] Statistical Measurement [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] 1998 Plan Nineteen Ninety Eight Plan [Member] Nineteen Ninety Eight Plan [Member] 2000 Plan Two Thousand Plan [Member] Two Thousand Plan [Member] 1998 and 2000 Plan Nineteen Ninety Eight And Two Thousand Plan [Member] Nineteen Ninety Eight and Two Thousand Plan [Member] 2009 Plan Two Thousand Nine Plan [Member] Two Thousand Nine Plan [Member] 2009 Plan, Amended Two Thousand Nine Plan, Amended [Member] Two Thousand Nine Plan, Amended [Member] 2010 Employee Stock Purchase Plan Employee Stock Purchase Plan Twenty Ten [Member] Employee Stock Purchase Plan, 2010 [Member] 2018 Plan 2018 Plan [Member] 2018 Plan [Member] Award Type [Axis] Award Type [Axis] Award Type [Domain] Award Type [Domain] Stock Option Share-based Payment Arrangement, Option [Member] Incentive Stock Option Incentive Stock Option [Member] Incentive Stock Option [Member] Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Stock repurchased during period (in shares) Per share weighed average fair value of stock options granted during the period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Period used to determine volatility Share-based Compensation Arrangement By Share-based Payment Award, Fair Value Assumptions, Period Used To Determine Volatility Share-based Compensation Arrangement By Share-based Payment Award, Fair Value Assumptions, Period Used To Determine Volatility Shares of common stock available for issuance (up to) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Increase in number of shares of common stock available for issuance Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized Shares reserved for future issuance Common Stock, Capital Shares Reserved for Future Issuance Stock option term Share Based Compensation Arrangement By Share Based Payment Award Options Expiration Term Share Based Compensation Arrangement by Share Based Payment Award, Options, Expiration Term Fair value of stock options exercised Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Exercises in Period, Fair Value Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Exercises in Period, Fair Value Unrecognized compensation cost related to novested share-based compensation arrangements Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Unrecognized compensation cost related to nonvested share-based compensation arrangements Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Weighted average recognition period of unrecognized compensation cost Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Component of stock-based compensation expense to be paid out in RSUs Share-Based Compensation, Component To Be Paid Out In RSU Amount of noncash expense for share-based payment arrangement related to component that will be paid out in Restricted Stock Units. Accrual for stock-based compensation arrangement to be paid out in RSUs Deferred Compensation Share-based Arrangements, Liability, Current Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Stock-based compensation expense Share-based Payment Arrangement, Noncash Expense Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Schedule of Acquired Finite-Lived Intangible Asset by Major Class [Table] Finite Lived Intangible Assets By Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Technology Technology [Member] Technology [Member] Customer relationships Customer Contracts [Member] Patents Patents [Member] Other Other Intangible Assets [Member] Acquired Finite-Lived Intangible Assets [Line Items] Acquired 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 Weighted Average Amortization Period Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Operating leases, initial lease terms Lessee, Operating Lease, Term of Contract Operating lease right-of-use asset Operating lease liabilities Operating Lease, Liability Cash payments for operating leases Operating Lease, Payments Rental expense for operating leases Operating Lease, Expense Fair Value Measurements Fair Value Disclosures [Text Block] Property, Plant and Equipment [Abstract] Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Property Plant And Equipment By Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Computer equipment and software Computer Equipment And Software [Member] Computer Equipment And Software [Member] Software Development [Member] Software Development [Member] Furniture, equipment and building improvements Furniture Equipment And Building Improvements [Member] Furniture, Equipment and Building Improvements [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Property and equipment, gross Property, Plant and Equipment, Gross Less: accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Total Revenue Recognition Revenue from Contract with Customer [Text Block] Schedule of Deferred Revenues and Contract Balances Contract with Customer, Asset and Liability [Table Text Block] Schedule of Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Schedule of Revenue by Geographic Region Revenue from External Customers by Geographic Areas [Table Text Block] Accounting Policies [Abstract] Description of Business and Basis of Presentation Business Description and Accounting Policies [Text Block] Schedule of Goodwill Schedule of Goodwill [Table Text Block] Summary of Intangible Assets Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block] Schedule of Finite-Lived Intangible Assets, Future Amortization Expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Basic (in shares) Effect of assumed exercised options (in shares) Weighted Average Number Diluted Shares Outstanding Adjustment Diluted (in shares) Property and Equipment Property, Plant and Equipment Disclosure [Text Block] Hosted Services - Consumer Hosted Services - Consumer [Member] Hosted Services - Consumer [Member] Accrued Expenses and Other Current Liabilities Accounts Payable and Accrued Liabilities Disclosure [Text Block] Options 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 Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Exercised (in shares) Cancelled or expired (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Ending balance (in shares) Options vested and expected to vest (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Options exercisable at end of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Beginning balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Cancelled or expired (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Ending balance (in dollars per share) Options vested and expected to vest (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Options exercisable at end of period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Weighted Average Remaining Contractual Term (in years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Options outstanding at end of period Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Options vested and expected to vest Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Options exercisable at end of period Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract] Options outstanding at end of period Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Options vested and expected to vest Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Options exercisable at end of period Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Restructuring Restructuring and Related Activities Disclosure [Text Block] Other Commitments [Table] Other Commitments [Table] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Letter of Credit Letter of Credit [Member] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] LOC for Office Space Letter Of Credit For Office Space [Member] Letter Of Credit For Office Space [Member] LOC for Security Deposit Letter Of Credit For Security Deposit [Member] Letter Of Credit For Security Deposit [Member] Defined Contribution Plan Match Groups [Axis] Defined Contribution Plan Match Groups [Axis] Defined Contribution Plan Match Groups [Axis] Defined Contribution Plan Match Groups [Domain] Defined Contribution Plan Match Groups [Domain] [Domain] for Defined Contribution Plan Match Groups [Axis] Match Step One Matching Tranche One [Member] Matching Tranche One [Member] Match Step Two Matching Tranche Two [Member] Matching Tranche Two [Member] Other Commitments [Line Items] Other Commitments [Line Items] Employer matching contribution, percent of match Defined Contribution Plan, Employer Matching Contribution, Percent of Match Employer matching contribution percent of eligible compensation Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Employer contribution limit Defined Contribution Plan, Employer Discretionary Contribution Amount Employer contribution vesting period Defined Benefit Plan Employers Contribution Of Vesting Period Defined Benefit Plan Employers Contribution of Vesting Period Employer matching contributions Defined Benefit Plan, Plan Assets, Contributions by Employer Letters of credit outstanding Line of Credit Facility, Maximum Borrowing Capacity Proceeds from amounts drawn against letters of credit Proceeds from Lines of Credit Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Convertible Debt Convertible Debt [Member] Convertible Senior Notes Convertible Senior Notes [Member] Convertible Senior Notes [Member] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Anti-dilutive common stock awards not included in earnings per share calculation (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Convertible debt conversion price (in dollars per share) Debt Instrument, Convertible, Conversion Price Summary of Financial Information by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Long-Lived Assets by Geographic Region Long-lived Assets by Geographic Areas [Table Text Block] Goodwill and Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Schedule of Restructuring and Related Costs Restructuring and Related Costs [Table Text Block] Number of operating segments Number of Operating Segments Payroll and other employee related costs Employee-related Liabilities, Current Professional services and consulting and other vendor fees Accrued Professional Fees, Current Unrecognized tax benefits Taxes Payable, Current Sales commissions Accrued Sales Commission, Current Restructuring Other Other Accrued Liabilities, Current Total New Accounting Pronouncements or Change in Accounting Principle [Table] New Accounting Pronouncements or Change in Accounting Principle [Table] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] ASU No. 2016-02 Accounting Standards Update 2016-02 [Member] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Billing Status, Type [Axis] Billing Status, Type [Axis] Receivables Billing Status [Domain] Receivables Billing Status [Domain] Accounts Receivable Billed Revenues [Member] Unbilled Receivable Unbilled Revenues [Member] Contract Balances [Roll Forward] Contract Balances [Roll Forward] Contract Balances [Roll Forward] Opening balance, Receivable Increase in accounts receivable, net Increase (Decrease) In Billed Receivables Increase (Decrease) In Billed Receivables Increase in unbilled receivables, net Increase (Decrease) in Unbilled Receivables Ending balance, Receivable Opening balance, Prepaid Commissions Capitalized Contract Cost, Net Increase in prepaid commissions, net Increase (Decrease) In Capitalized Contract Cost Increase (Decrease) In Capitalized Contract Costs Ending balance, Prepaid Commissions Opening balance, Deferred Revenue (current) Increase in current deferred revenue, net Increase (Decrease) in Deferred Revenue, Current Increase (Decrease) in Deferred Revenue, Current Ending balance, Deferred Revenue (current) Opening balance, Deferred Revenue (long-term) Increase in long-term deferred revenue, net Increase (Decrease) in Deferred Revenue, Noncurrent Increase (Decrease) in Deferred Revenue, Noncurrent Ending balance, Deferred Revenue (long-term) Derivative [Table] Derivative [Table] Hedging Designation [Axis] Hedging Designation [Axis] Hedging 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recorded in accounts payable Capital Expenditures Incurred but Not yet Paid Issuance of 85,861 shares of common stock in connection with the BotCentral transaction on January 22, 2018 Other Significant Noncash Transaction, Value of Consideration Given Debt offering costs, accrued but not paid Debt Offering Costs Incurred But Not Yet Paid Debt Offering Costs Incurred But Not Yet Paid Schedule of Financial Assets and Liabilities Measured at Fair Value Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Schedule of Changes in Fair Value of Level 3 Liabilities Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Schedule of Gains (Losses) on Derivative Instruments Recognized in Income Statement Derivative Instruments, Gain (Loss) [Table Text Block] Award Type [Domain] Number of Shares (in thousands) Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, 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payments Lessee, Operating Lease, Liability, Payment, Due [Abstract] 2019 (remaining three months) 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 Lessee, Operating Lease, Liability, Payments, Due Year Six Lessee, Operating Lease, Liability, Payments, Due Year Six Thereafter Lessee, Operating Lease, Liability, Payments, Due After Year Six Lessee, Operating Lease, Liability, Payments, Due After Year Six Total undiscounted lease payments Lessee, Operating Lease, Liability, Payments, Due Less: present value adjustment Lessee, Operating Lease, Liability, Undiscounted Excess Amount Total operating lease liability Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation 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Nonfinancial Liabilities, Fair Value Disclosure Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Principles of Consolidation Consolidation, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Recently Issued Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block] Revenue Recognition Revenue from Contract with Customer [Policy Text Block] Net Loss Per Share Earnings Per Share, Policy [Policy Text Block] Segment Information Segment Reporting, Policy [Policy Text Block] Stock-Based Compensation Share-based Payment Arrangement [Policy Text Block] Other expense, ent Other Expense [Member] Capped Calls Capped Calls [Member] Capped Calls [Member] Aggregate principal Debt Instrument, Face Amount Debt instrument stated rate (percent) Debt Instrument, Interest Rate, Stated Percentage Aggregate principal from exercise in full of over-allotment options Aggregate Principal From Exercise In Full Of Over-Allotment Options Aggregate Principal From Exercise In Full Of Over-Allotment Options Proceeds from debt offering, net of debt issuance costs Proceeds from Debt, Net of Issuance Costs Debt instrument, unit of principal for conversion Debt Instrument, Unit Of Principal For Conversion, Amount Debt Instrument, Unit Of Principal For Conversion, Amount Number of shares per convertible note Debt Instrument, Convertible, Number of Equity Instruments Per 1000 Principal Debt Instrument, Convertible, Number of Equity Instruments Per 1000 Principal Percentage of principal amount paid if repurchase due to fundamental change (percent) Debt Instrument, Redemption Price, Percentage Threshold trading days in consideration of note conversion Debt Instrument, Convertible, Threshold Trading Days Threshold consecutive trading days in analysis of conversion price Debt Instrument, Convertible, Threshold Consecutive Trading Days Threshold percentage of stock price if converted Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger Threshold for five day period, product of sale price of common stock and conversion rate of notes Debt Instrument, Convertible, Five Day Period, Threshold Of Product Of Sale Price Of Stock And Conversion Rate Debt Instrument, Convertible, Five Day Period, Threshold Of Product Of Sale Price Of Stock And Conversion Rate Carry amount of equity component of convertible notes Total deferred issuance costs Deferred Finance Costs, Liability And Equity Component Deferred Finance Costs, Liability And Equity Component Debt issuance costs attributable to liability Debt Issuance Costs, Gross Remaining amortization period for debt discount and debt issuance costs Debt Instrument, Convertible, Remaining Discount Amortization Period Effective interest rate (percent) Debt Instrument, Interest Rate During Period Interest expense Capped caps initial strike price (in dollars per share) Capped Calls, Initial Option Strike Price Capped Calls, Initial Option Strike Price Capped caps initial cap price (in dollars per share) Capped Calls, Initial Cap Price Capped Calls, Initial Cap Price Number of shares of common stock covered by called caps (shares) Number Of Shares Of Common Stock Covered By Capped Calls Number Of Shares Of Common Stock Covered By Capped Calls Reduction to additional paid-in-capital related to called caps Adjustments to additional paid in capital related to issuance costs attributable to equity component Statement of Comprehensive Income [Abstract] Foreign currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Comprehensive loss Comprehensive Income (Loss), Net of Tax, Attributable to Parent Acquisitions Business Combination Disclosure [Text Block] Legal Matters Legal Matters and Contingencies [Text Block]