Goodwill and Intangible Assets Disclosure [Abstract] Schedule of Goodwill [Table] Schedule of Goodwill [Table] Statement Business Segments [Axis] Segments [Axis] Segment [Domain] Segments [Domain] Business Business [Member] Business [Member]. Consumer Consumer [Member] Consumer [Member] Goodwill [Line Items] Goodwill [Line Items] Beginning Balance Goodwill Foreign exchange adjustment Goodwill, Foreign Currency Translation Gain (Loss) Ending Balance Accounting Policies [Abstract] 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 Recognition, Policy [Policy Text Block] Net Loss Per Share Earnings Per Share, Policy [Policy Text Block] Segment Information Segment Reporting, Policy [Policy Text Block] Goodwill and Intangible Assets Goodwill and Intangible Assets, Policy [Policy Text Block] Stock-Based Compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] 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] Trade names Trade Names [Member] Non-compete agreements Noncompete Agreements [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 Intangible Assets, Net (Excluding Goodwill) Weighted Average Amortization Period Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Statement of Financial Position [Abstract] ASSETS Assets [Abstract] CURRENT ASSETS: Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Cash held as collateral Restricted Cash and Cash Equivalents Accounts receivable, net of allowance for doubtful accounts of $1,672 and $1,318 as of June 30, 2018 and December 31, 2017, respectively 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 Intangibles, net 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 Total current liabilities Liabilities, Current Deferred revenue Contract with Customer, Liability, Noncurrent Other liabilities Other Liabilities, Noncurrent Deferred tax liability Deferred Income Tax Liabilities, Net Total liabilities Liabilities Commitments and contingencies Commitments and Contingencies STOCKHOLDERS’ EQUITY: Stockholders' Equity Attributable to Parent [Abstract] Common stock Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Treasury stock 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 Revenue from Contract with Customer [Abstract] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Products and Services [Axis] Products and Services [Axis] Products and Services [Domain] Products and Services [Domain] Hosted Services - Business Hosted Services - Business [Member] Hosted Services - Business [Member] Hosted Services - Consumer Hosted Services - Consumer [Member] Hosted Services - Consumer [Member] Professional Services Professional Services [Member] Professional Services [Member] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Deferred Revenue Contract with Customer, Liability Payables and Accruals [Abstract] Schedule of Accrued Expenses and Other Current Liabilities Schedule of Accrued Liabilities [Table Text Block] 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 income (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 Allocated Share-based Compensation Expense Depreciation expense Depreciation, Nonproduction Amortization of purchased intangibles Cost of Goods Sold, Amortization Fair Value Disclosures [Abstract] 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 Derivative Instruments Schedule of Derivative Instruments [Table Text Block] Schedule of Derivative Liabilities at Fair Value Schedule of Derivative Liabilities at Fair Value [Table Text Block] Gain (Losses) on Derivative Instruments Recognized in Income Statement Derivative Instruments, Gain (Loss) [Table Text Block] Derivative [Table] Derivative [Table] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Derivatives not designated as hedging instruments Not Designated as Hedging Instrument [Member] Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Foreign currency derivative contracts Foreign Exchange Forward [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] Accrued expenses and other liabilities Accrued Liabilities [Member] Derivative [Line Items] Derivative [Line Items] Derivative Assets Derivative Asset [Abstract] Foreign currency derivative contracts Derivative Asset Derivative Liabilities Derivative Liability [Abstract] Foreign currency derivative contracts Derivative Liability Restructuring and Related Activities [Abstract] Restructuring expense Restructuring liability Restructuring Reserve Accrued Expenses and Other Current Liabilities Accounts Payable and Accrued Liabilities Disclosure [Text Block] Property, Plant and Equipment [Abstract] Summary of Property and Equipment Property, Plant and Equipment [Table Text Block] Revenue Recognition Revenue from Contract with Customer [Text Block] Segment Reporting [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Operating Segments Operating Segments [Member] Corporate Corporate, Non-Segment [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Revenue: Segment Reporting Information, Revenue for Reportable Segment [Abstract] Revenue Sales and marketing Unallocated corporate expenses Segment Reporting Unallocated Corporate Expenses Segment Reporting Unallocated Corporate Expenses Schedule of Restructuring and Related Costs Restructuring and Related Costs [Table Text Block] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] 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] Number of Shares (in thousands) Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] Beginning balance outstanding (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number Awarded (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted Released (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Forfeitures Non-vested and outstanding at end of period (in shares) Expected to vest (in shares) Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Expected To Vest Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Expected To Vest Weighted Average Grant Date Fair Value (usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Weighted Average Grant Date Fair Value [Abstract] [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Weighted Average Grant Date Fair Value [Abstract] [Roll Forward] Beginning balance outstanding (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 Awarded (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 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 Forfeited (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 Non-vested and outstanding at end of period (in dollars per share) Expected to vest (in dollars per share) Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Expected To Vest, Weighted Average Grant Date Fair Value Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Expected To Vest, Weighted Average Grant Date Fair Value Aggregate Fair Value (in thousands) Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Aggregate Intrinsic Value [Roll Forward] Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Aggregate Intrinsic Value [Roll Forward] Non-vested and outstanding at June 30, 2018 Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Aggregate Intrinsic Value, Nonvested And Outstanding Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Aggregate Intrinsic Value, Nonvested And Outstanding Expected to vest Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Aggregate Intrinsic Value, Expected To Vest Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Aggregate Intrinsic Value, Expected To Vest Statement of Comprehensive Income [Abstract] Net loss 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 Recognition of deferred revenue Contract with Customer, Liability, Revenue Recognized Anti-dilutive common stock awards not included in earnings per share calculation (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Restructuring Reserve [Roll Forward] Restructuring Reserve [Roll Forward] Balance, Beginning of the year Severance and other associated costs Severance Costs Cash payments Payments for Restructuring Wind down cost legacy platform Wind Down Costs of Legacy Platform Wind Down Costs of Legacy Platform Balance, End of period 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] 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] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Expected life Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Historical volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Restricted cash balance Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Recurring Fair Value, Measurements, Recurring [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value, Measurements, 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] Money market funds Money Market Funds [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] Assets: Assets, Fair Value Disclosure [Abstract] Money market funds Cash and Cash Equivalents, Fair Value Disclosure Assets Assets, Fair Value Disclosure Liabilities: Liabilities, Fair Value Disclosure [Abstract] Liabilities Financial and Nonfinancial Liabilities, Fair Value Disclosure Goodwill and Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Segment Information Segment Reporting Disclosure [Text Block] Rental expense for operating leases Operating Leases, Rent Expense Defined benefit plan employer matching contribution on first five percent of employee compensation Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Percentage of employees' eligible compensation for employer matching contribution Percentage Of Eligible Employee Compensation Percentage Of Eligible Employee Compensation Defined benefit plan employer contribution limit Defined Contribution Plan, Employer Discretionary Contribution Amount Defined benefit plan employer contribution vesting period Defined Benefit Plan Employers Contribution Of Vesting Period Defined Benefit Plan Employers Contribution of Vesting Period Defined benefit plan employer contribution Defined Benefit Plan, Plan Assets, Contributions by Employer Line of Credit Facility [Table] Line of Credit Facility [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] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] 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 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] 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 Amortization Amortization Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] BotCentral BotCentral [Member] BotCentral [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Equity consideration in acquisition Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Acquisition costs Business Acquisition, Transaction Costs Total consideration transferred Business Combination, Consideration Transferred Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] United States UNITED STATES Israel [Member] ISRAEL Australia [Member] AUSTRALIA Netherlands [Member] NETHERLANDS Other [Member] United Kingdom, Germany, Japan, France, Italy [Member] United Kingdom, Germany, Japan, France, Italy [Member] Total long-lived assets Assets, Noncurrent 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 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] Net Loss Per Share Earnings Per Share [Text Block] 2018 Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 2019 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2020 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2022 Finite-Lived Intangible Assets, Amortization Expense, Year Five Thereafter Finite-Lived Intangible Assets, Amortization Expense, after Year Five Total Finite-Lived Intangible Assets, Net 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) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 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 Weighted Average Assumptions of Fair Value Options Using Black-Scholes Option-Pricing Model Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Summary of Stock Option Activity and Weighted Average Exercise Prices Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] Other Americas Other Americas [Member] Other Americas [Member] Total Americas Americas [Member] EMEA EMEA [Member] APAC POSIT - ASIA PACIFIC [Member] United Kingdom UNITED KINGDOM 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 (decrease) in accounts receivable, net Increase (Decrease) In Billed Receivables Increase (Decrease) In Billed Receivables Increase (decrease) in unbilled receivables, net Increase (Decrease) in Unbilled Receivables Ending balance, Receivable Opening balance, Deferred Revenue (current) Increase (decrease) 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 (decrease) in long-term deferred revenue, net Increase (Decrease) in Deferred Revenue, Noncurrent Increase (Decrease) in Deferred Revenue, Noncurrent Ending balance, Deferred Revenue (long-term) Statement of Cash Flows [Abstract] OPERATING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net loss to net cash (used in) provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Stock-based compensation expense Share-based Compensation Depreciation Depreciation Amortization of purchased intangibles Amortization of tenant allowance Tenant Allowance, Amortization, Lessee Amortization of lessee lease liability over time which offsets lease expense. Deferred income taxes Deferred Income Tax Expense (Benefit) Provision for doubtful accounts, net Provision for Doubtful Accounts Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable Increase (Decrease) in Accounts Receivable Prepaid expenses and other current assets Increase Decrease In Prepaid Expense And Other Current Assets Increase (Decrease) In Prepaid Expense And Other Current Assets Other assets Increase (Decrease) in Other Operating Assets Accounts payable Increase (Decrease) in Accounts Payable Accrued expenses and other current liabilities Increase (Decrease) in Accrued Liabilities Deferred revenue Increase (Decrease) in Deferred Revenue Other liabilities Increase (Decrease) in Other Operating Liabilities Net cash (used in) provided by operating activities Net Cash Provided by (Used in) Operating Activities INVESTING ACTIVITIES: Net Cash Provided by (Used in) Investing Activities [Abstract] Purchases of property and equipment, including capitalized software Payments to Acquire Productive Assets Cash held as collateral for foreign exchange forward contracts Increase (Decrease) in Restricted Cash Payments for acquisitions and intangible assets, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities FINANCING ACTIVITIES: Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds from issuance of common stock in connection with the exercise of options Proceeds from Issuance of Common Stock Repurchase of common stock Payments for Repurchase of Common Stock Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities EFFECT OF FOREIGN 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 the period CASH AND CASH EQUIVALENTS - End of the period SUPPLEMENTAL DISCLOSURE OF OTHER CASH FLOW INFORMATION: Supplemental Cash Flow Information [Abstract] Cash paid for income taxes Income Taxes Paid, Net SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Purchase of property and equipment recorded in accounts payable Capital Expenditures Incurred but Not yet Paid Noncash or Part Noncash Acquisition, Costs Noncash or Part Noncash Acquisition, Costs Noncash or Part Noncash Acquisition, Costs Number of operating segments Number of Operating Segments Accounts receivable, allowance for doubtful accounts Allowance for Doubtful Accounts Receivable, Current Other (income) expense Other Nonoperating Income (Expense) [Member] Notional amount of foreign currency derivative contracts Derivative, Notional Amount Fair value of foreign currency derivatives contracts Derivative, Fair Value, Net Gain (losses) on Derivative Instruments Recognized in Statements of Operations Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net Description of Business and Basis of Presentation Business Description and Accounting Policies [Text Block] Fair Value Measurements Fair Value Disclosures [Text Block] Basic (in shares) Effect of assumed exercised options (in shares) Weighted Average Number Diluted Shares Outstanding Adjustment Diluted (in shares) Schedule of Restructuring and Related Costs [Table] Schedule of Restructuring and Related Costs [Table] Restructuring Type [Axis] Restructuring Type [Axis] Type of Restructuring [Domain] Type of Restructuring [Domain] Severance and other associated costs Employee Severance [Member] Wind down cost legacy platform Wind Down Costs [Member] Wind Down Costs [Member] Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Reconciliation of Shares Used in Calculating Basic and Diluted Earnings Per Share Schedule of Weighted Average Number of Shares [Table Text Block] 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. 2014-09 Accounting Standards Update 2014-09 [Member] New Accounting Pronouncements or Change in Accounting Principle [Line Items] New Accounting Pronouncements or Change in Accounting Principle [Line Items] Cumulative effect on retained earnings Cumulative Effect of New Accounting Principle in Period of Adoption Prepaid commissions Deferred Sales Commission Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table] Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table] Exercise Price Range [Axis] Exercise Price Range [Axis] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain] $1.79 - $7.45 Exercise Price Range One [Member] Exercise Price Range One [Member] $7.60 - $7.60 Exercise Price Range Two [Member] Exercise Price Range Two [Member] $7.95 - $9.55 Exercise Price Range Three [Member] Exercise Price Range Three [Member] $9.90 - $10.13 Exercise Price Range Four [Member] Exercise Price Range Four [Member] $10.31 - $11.95 Exercise Price Range Five [Member] Exercise Price Range Five [Member] $11.96 - $12.32 Exercise Price Range Six [Member] Exercise Price Range Six [Member] $12.45 - $12.45 Exercise Price Range Seven [Member] Exercise Price Range Seven [Member] $12.46 - $13.59 Exercise Price Range Eight [Member] Exercise Price Range Eight [Member] $14.30- $15.85 Exercise Price Range Nine [Member] Exercise Price Range Nine [Member] $15.96 - $21.75 Exercise Price Range Ten [Member] Exercise Price Range Ten [Member] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] Exercise price range, minimum (in dollars per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit Exercise price range, maximum (in dollars per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit Options outstanding, Number of shares outstanding (in shares) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options Options outstanding, Weighted-average remaining contractual life Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term Options outstanding, Weighted-average exercise price (in dollars per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price Options exercisable, Number of shares (in shares) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options Options exercisable, Weighted-average exercise price (in dollars per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price Stockholders' Equity Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Property and Equipment Property, Plant and Equipment Disclosure [Text Block] Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract] 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 Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share 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 Share Repurchase Program [Axis] Share Repurchase Program [Axis] Share Repurchase Program [Domain] Share Repurchase Program [Domain] 2012 Stock Repurchase Program 2012 Stock Repurchase Program [Member] 2012 Stock Repurchase Program [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 [Domain] Stock Option Employee Stock Option [Member] Stock repurchase program, authorized amount Stock Repurchase Program, Authorized Amount Increase to authorized amount Stock Repurchase Program, Increase To Authorized Amount Stock Repurchase Program, Increase To Authorized Amount Stock repurchased during period (in shares) Stock Repurchased During Period, Shares Stock repurchase program, remaining authorized repurchase amount Stock Repurchase Program, Remaining Authorized Repurchase Amount 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 Total value of stock options exercised Stock Issued During Period, Value, Stock Options Exercised Unrecognized compensation cost related to nonvested share-based compensation arrangements Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options Weighted average recognition period of unrecognized compensation cost Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Document And Entity Information [Abstract] Document And Entity Information [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Trading Symbol Trading Symbol 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 Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Legal Matters Legal Matters and Contingencies [Text Block] Restructuring Restructuring and Related Activities Disclosure [Text Block]