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Cash held as collateral Increase (Decrease) in Restricted Cash 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] Repurchase of common stock Payments for Repurchase of Common Stock Excess tax benefit from the exercise of employee stock options Excess Tax Benefit from Share-based Compensation, Financing Activities Payments related to contingent consideration Payments for Previous Acquisition Proceeds from issuance of common stock in connection with the exercise of options Proceeds from Issuance of Common Stock Net cash provided by (used in) 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 year Cash and Cash Equivalents, at Carrying Value CASH AND CASH EQUIVALENTS - End of the year 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 Leasehold improvements funded by landlord Capital Expenditures Paid By Landlord Capital Expenditures Paid By Landlord 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 Dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend 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$10.31 - $12.32 [Member] Exercise Price Range Six [Member] Exercise Price Range Six [Member] $12.46 - $13.28 [Member] Exercise Price Range Seven [Member] Exercise Price Range Seven [Member] $13.34 - $14.30 [Member] Exercise Price Range Eight [Member] Exercise Price Range Eight [Member] $15.66 - $18.09 [Member] Exercise Price Range Nine [Member] Exercise Price Range Nine [Member] $18.24 - $18.24 [Member] 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 Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options Options Outstanding, Weighted-Average Remaining Contractual Life (Years) 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 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 Income Tax Contingency [Table] Income Tax Contingency [Table] Germany [Member] GERMANY Japan [Member] JAPAN Income Tax Contingency [Line Items] Income Tax Contingency [Line Items] United States Income (Loss) from Continuing Operations before Income Taxes, Domestic Foreign Income (Loss) from Continuing Operations before Income Taxes, Foreign (Loss) income before provision for (benefit from) income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Property and Equipment Property, Plant and Equipment Disclosure [Text Block] Reconciliation of Shares Used in Calculating Basic and Diluted Earnings Per Share Schedule of Weighted Average Number of Shares [Table Text Block] Federal Statutory Rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent State taxes, net of federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Non-deductible expenses – ISO Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent Non-deductible expenses – Other Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent Foreign tax rate differential Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent Change in valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Return to provision true-up adjustment Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Percent Effect of new tax legislation Effective Income Tax Rate Reconciliation, Tax Cuts And Jobs Act Of 2017, Percent Percentage of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to increase (decrease) in income tax rate and transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act of 2017. Other Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Total provision for income taxes Effective Income Tax Rate Reconciliation, Percent Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis 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 Derivative Instruments Schedule of Derivative Instruments [Table Text Block] Schedule of Derivative Assets at Fair Value Schedule of Derivative Assets at Fair Value [Table Text Block] Schedule of Derivative Liabilities at Fair Value Schedule of Derivative Liabilities at Fair Value [Table Text Block] Schedule of Gains (Losses) on Derivative Instruments Recognized in the Income Statement Derivative Instruments, Gain (Loss) [Table Text Block] Future Minimum Lease Payments Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] 2018 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2019 Operating Leases, Future Minimum Payments, Due in Two Years 2020 Operating Leases, Future Minimum Payments, Due in Three Years 2021 Operating Leases, Future Minimum Payments, Due in Four Years 2022 Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total minimum lease payments Operating Leases, Future Minimum Payments Due Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Unrecognized tax benefits balance at January 1 Gross increase for tax positions of prior years Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Gross increase for tax positions of current years Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Decrease due to expiration of statue Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations Gross unrecognized tax benefits at December 31 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 Investments, All Other Investments [Abstract] Investments Cost-method Investments, Description [Text Block] Technology licenses and consulting services purchased Payments to Acquire Intangible Assets Intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Intangible assets written off due to impairment of investment Intangible Assets Written Off Intangible Assets Written Off Restructuring charges incurred before adjustment for recovery of bad debt Restructuring and Related Cost, Incurred Cost Restructuring liability Payables and Accruals [Abstract] Payroll and other employee related costs Employee-related Liabilities, Current Professional services, consulting and other vendor fees Accrued Professional Fees, Current Unrecognized tax benefits Taxes Payable, Current Sales commissions Accrued Sales Commission, Current Contingent earn-out (Note 7 and 8) Contingent Earnout Liability Contingent earnout liability. Restructuring Reserve Other Other Accrued Liabilities, Current Total Accrued Liabilities, Current Goodwill and Intangible Assets Goodwill and Intangible Assets Disclosure [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 [Member] Technology [Member] Technology [Member] Customer Contracts [Member] Customer Contracts [Member] Trade Names [Member] Trade Names [Member] Non-compete Agreements [Member] Noncompete Agreements [Member] Patents [Member] Patents [Member] Other [Member] 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 Acquired Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Net Carrying Amount Weighted Average Amortization Period Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Segment Information Segment Reporting Disclosure [Text Block] Accrued Liabilities and Other Current Liabilities Accounts Payable and Accrued Liabilities Disclosure [Text Block] Income Statement [Abstract] Cost Of Revenue [Member] Cost of Sales [Member] Sales and Marketing [Member] Selling and Marketing Expense [Member] General and Administrative [Member] General and Administrative Expense [Member] Product Development [Member] Research and Development Expense [Member] 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 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 Provision for income taxes Net loss Net loss per share of common stock: Basic (in dollars per share) Earnings Per Share, Basic Diluted (in dollars per share) Earnings Per Share, Diluted Weighted-average shares used to compute net loss income per share: Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] Diluted (in shares) Additional Information on Operating Expenses: Operating Expenses [Abstract] Stock compensation expense Depreciation expense Depreciation, Nonproduction Amortization of purchased intangibles Cost of Goods Sold, Amortization Business [Member] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Corporate [Member] Corporate, Non-Segment [Member] Hosted services – Business Business Services Revenue Business Services Revenue Hosted services – Consumer Consumer Services Revenue Consumer Services Revenue Professional services Professional Services Revenue Professional Services Revenue Total revenue Unallocated corporate expenses Segment Reporting Unallocated Corporate Expenses Segment Reporting Unallocated Corporate Expenses Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Contingent Earn-Out [Member] Contingent Earn-Out [Member] Contingent Earn-Out [Member] Foreign currency derivative contracts [Member] Foreign Exchange Forward [Member] Money Market Funds [Member] Money Market Funds [Member] Fair value of assets Fair value of liabilities Schedule of Change in Accounting Estimate [Table] Schedule of Change in Accounting Estimate [Table] Change in Accounting Estimate by Type [Axis] Change in Accounting Estimate by Type [Axis] Change in Accounting Estimate, Type [Domain] Change in Accounting Estimate, Type [Domain] Change in Estimated Useful Life [Member] Service Life [Member] Change in Accounting Estimate [Line Items] Change in Accounting Estimate [Line Items] Net income (loss) Basic earnings (loss) per share (in dollars per share) Diluted earnings (loss) per share (in dollars per share) Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Options outstanding, 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 Options outstanding, ending balance (in shares) Options vested and expected to vest Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Options exercisable 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] Options outstanding, 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 (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Options outstanding, 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 (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 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 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 Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Options vested and expected to vest Share-based Compensation Arrangement By Share-based Payment Award, Options, Vested And Expected To Vest, Aggregate Intrinsic Value Share-based Compensation Arrangement By Share-based Payment Award, Options, Vested And Expected To Vest, Aggregate Intrinsic Value Options exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Description of Business and Summary of Significant Accounting Policies Business Description and Accounting Policies [Text Block] 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] Schedule 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 Units Award Activity Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] Schedule of Accrued Liabilities Schedule of Accrued Liabilities [Table Text Block] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Balance, Beginning of year Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value Cash payment Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements Balance, End of year ASSETS Assets [Abstract] CURRENT ASSETS: Assets, Current [Abstract] Cash and cash equivalents Accounts receivable, net of allowance for doubtful accounts of $1,318 and $1,732, in 2017 and 2016, 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 Intangibles, net Intangible Assets, Net (Excluding Goodwill) Goodwill Deferred tax assets, net Deferred Income Tax Assets, Net 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 Deferred revenue Deferred Revenue, Current Total current liabilities Liabilities, Current Other liabilities Other Liabilities, Noncurrent Deferred tax liability Deferred Income Tax Liabilities, Net Total liabilities Liabilities Commitments and contingencies (See Note 9) 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 Total liabilities and stockholders’ equity Liabilities and Equity Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Summary of Operations Summary Of Operations [Policy Text Block] The accounting policy related to summary of operations. Principles of Consolidation Consolidation, Policy [Policy Text Block] Reclassification Reclassification, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Concentration of Credit Risk Concentration Risk, Credit Risk, Policy [Policy Text Block] Foreign Currency Translation Foreign Currency Transactions and Translations Policy [Policy Text Block] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Accounts Receivable Trade and Other Accounts Receivable, Policy [Policy Text Block] Property and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Internal-Use Software Development Costs Internal Use Software, Policy [Policy Text Block] Goodwill and Intangible Assets Goodwill and Intangible Assets, Policy [Policy Text Block] Impairment of Long-Lived Assets Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Revenue Recognition Revenue Recognition, Policy [Policy Text Block] Advertising Costs Advertising Cost, Policy, Expensed Advertising Cost [Policy Text Block] Stock-based Compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Deferred Rent Deferred Charges, Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Comprehensive Loss Comprehensive Income, Policy [Policy Text Block] Recently Issued Accounting Standards New Accounting Pronouncements, Policy [Policy Text Block]