Disclosure of Compensation Related Costs, Share-based Payments [Abstract] 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 (in years) 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 Business Combinations [Abstract] Acquisitions Business Combination Disclosure [Text Block] Goodwill and Intangible Assets Disclosure [Abstract] Schedule of Goodwill [Table] Schedule of Goodwill [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Synchronite, LLC [Member] Synchronite, LLC [Member] Synchronite, LLC [Member] Statement Business Segments [Axis] Segments [Axis] Segment [Domain] Segments [Domain] Business [Member] Business [Member] Business [Member]. Consumer [Member] Consumer [Member] Consumer [Member] Goodwill [Line Items] Goodwill [Line Items] Beginning Balance Goodwill Goodwill, Translation Adjustments Goodwill, Foreign Currency Translation Gain (Loss) Ending Balance Stockholders' Equity Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Accounting Policies [Abstract] Description of Business and Basis of Presentation Business Description and Accounting Policies [Text Block] Document - Document And Entity Information [Abstract] Document - Document and Entity Information [Abstract] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period 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 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 [Member] Cost of Sales [Member] Sales and marketing expense [Member] Selling and Marketing Expense [Member] General and administrative expense [Member] General and Administrative Expense [Member] Product development expense [Member] Research and Development Expense [Member] Statement [Line Items] Statement [Line Items] Revenue Revenues Costs and expenses (1) (2) Costs and Expenses [Abstract] Cost of revenue (3) Cost of Revenue Sales and marketing Selling and Marketing Expense General and administrative General and Administrative Expense Product development Research and Development Expense 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 (benefit from) income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Provision for (benefit from) income taxes Income Tax Expense (Benefit) Net loss Net Income (Loss) Attributable to Parent Basic net (loss) income per common share (in dollars per share) Earnings Per Share, Basic Diluted net (loss) income per common share (in dollars per share) Earnings Per Share, Diluted Weighted average shares outstanding used in basic net (loss) income per common share calculation (in shares) Weighted Average Number of Shares Outstanding, Basic Weighted average shares outstanding used in diluted net (loss) income per common share calculation (in shares) Weighted Average Number of Shares Outstanding, Diluted Stock compensation expense Share-based Compensation Depreciation expense Depreciation, Nonproduction Property, Plant and Equipment [Abstract] Summary of Property and Equipment Property, Plant and Equipment [Table Text Block] Revenue Recognition [Abstract] Revenue Recognition Revenue Recognition [Text Block] Revenue Recognition [Text Block] Payables and Accruals [Abstract] Payroll and other employee related costs Employee-related Liabilities, Current Professional services and consulting and other vendor fees Accrued Professional Fees, Current Sales commissions Accrued Sales Commission, Current Contingent earnout (see Notes 8 and 9) Contingent Earnout Liability Contingent earnout liability. Other Other Accrued Liabilities, Current Total Accrued Liabilities, Current Goodwill and Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Fair Value Disclosures [Abstract] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Liability Class [Axis] Liability Class [Axis] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Contingent Earn-Out [Member] Contingent Earn-Out [Member] Contingent Earn-Out [Member] Contact At Once! [Member] Contact At Once! [Member] Contact At Once! [Member] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Recurring [Member] 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 3 [Member] Fair Value, Inputs, Level 3 [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] Business Combination, Contingent Consideration Arrangements, Change In Contingent Consideration Liability [Roll Forward] Business Combination, Contingent Consideration Arrangements, Change In Contingent Consideration Liability [Roll Forward] Business Combination, Contingent Consideration Arrangements, Change In Contingent Consideration Liability [Roll Forward] Balance, Beginning of Period Business Combination, Contingent Consideration, Liability Change in fair value of contingent consideration Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Cash payment Business Combination, Contingent Consideration, Payment Of A Portion Of Potential Earn-Out Consideration Amount Business Combination, Contingent Consideration, Payment Of A Portion Of Potential Earn-Out Consideration Amount Balance, End of Period 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 - $7.02 [Member] Exercise Price Range One [Member] Exercise Price Range One [Member] $7.04 - $9.24 [Member] Exercise Price Range Two [Member] Exercise Price Range Two [Member] $9.34 - $10.05 [Member] Exercise Price Range Three [Member] Exercise Price Range Three [Member] $10.09 - $10.09 [Member] Exercise Price Range Four [Member] Exercise Price Range Four [Member] $10.13 - $10.13 [Member] Exercise Price Range Five [Member] Exercise Price Range Five [Member] $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 - $16.00 [Member] Exercise Price Range Eight [Member] Exercise Price Range Eight [Member] $16.98 - $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 Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit Exercise price range, maximum 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 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 Fair Value, Assets Measured on Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Change 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 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] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] 2015 Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year 2016 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2017 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2018 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2019 Finite-Lived Intangible Assets, Amortization Expense, Year Five Thereafter Finite-Lived Intangible Assets, Amortization Expense, after Year Five Total Finite-Lived Intangible Assets, Net Revenue Recognition, Multiple-deliverable Arrangements [Table] Revenue Recognition, Multiple-deliverable Arrangements [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Revenue Recognition, Multiple-deliverable Arrangements [Line Items] Revenue Recognition, Multiple-deliverable Arrangements [Line Items] Typical service agreements Service Agreement Term Service Agreement Term Typical service agreements termination notice period Termination Notice Period2 Termination Notice Period2 Property and Equipment Property, Plant and Equipment Disclosure [Text Block] Statement of Financial Position [Abstract] Accounts receivable, allowance for doubtful accounts Allowance for Doubtful Accounts Receivable, Current Granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Options Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Options outstanding at December 31, 2014 Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Granted Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Options cancelled Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Options outstanding at June 30, 2015 Options vested and expected to vest at June 30, 2015 Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Options exercisable at June 30, 2015 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 at December 31, 2013 Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Options granted Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Options exercised Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Options cancelled Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Options outstanding at June 30, 2015 Options vested and expected to vest at June 30, 2015 Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Options exercisable at June 30, 2015 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 June 30, 2015 Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Options vested and expected to vest at June 30, 2015 Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Options exercisable at June 30, 2015 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 June 30, 2015 Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Options vested and expected to vest at June 30, 2015 Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Options exercisable at June 30, 2015 Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Earnings Per Share [Abstract] Reconciliation of Shares Used in Calculating Basic and Diluted Earnings Per Share Schedule of Weighted Average Number of Shares [Table Text Block] Aggregate amortization expense for intangible assets Amortization Legal Matters Legal Matters and Contingencies [Text Block] Segment Reporting [Abstract] Number of operating segments Number of Operating Segments Net Loss Per Share Earnings Per Share [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 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 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] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Share Repurchase Program [Domain] Share Repurchase Program [Domain] 2012 Stock Repurchase Program [Member] 2012 Stock Repurchase Program [Member] 2012 Stock Repurchase Program [Member] Period Reported [Axis] Period Reported [Axis] Period Reported [Axis] Period Reported [Domain] Period Reported [Domain] Period Reported [Domain] 2009 Plan [Member] Amended [Member] Amended [Member] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] 1998 Plan [Member] Nineteen Ninety Eight Plan [Member] Nineteen Ninety Eight Plan [Member] 2000 Plan [Member] Two Thousand Plan [Member] Two Thousand Plan [Member] 1998 and 2000 Plan [Member] Nineteen Ninety Eight And Two Thousand Plan [Member] Nineteen Ninety Eight and Two Thousand Plan [Member] 2009 Plan [Member] Two Thousand Nine Plan [Member] Two Thousand Nine Plan [Member] 2010 Employee Stock Purchase Plan [Member] Employee Stock Purchase Plan Twenty Ten [Member] Employee Stock Purchase Plan, 2010 [Member] Award Type [Axis] Award Type [Axis] Award Type [Domain] Equity Award [Domain] Incentive Stock Option [Member] Incentive Stock Option [Member] Incentive Stock Option [Member] Restricted Stock Units (RSUs) [Member] 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 repurchase program, authorized amount Stock Repurchase Program, Authorized Amount Shares repurchased Treasury Stock, Shares Stock repurchase program, remaining authorized repurchase amount Stock Repurchase Program, Remaining Authorized Repurchase Amount Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 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 Share-based Compensation Arrangement By Share-based Payment Award, Fair Value Assumptions, Period Used To Determine Volatility Shares of common stock available for issuance 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 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 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 relationships [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 Intangibles, net Intangible Assets, Net (Excluding Goodwill) Weighted Average Amortization Period Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Fair Value Measurements Fair Value Disclosures [Text Block] Summary of Stock-Based Compensation Expense Related to Employee Stock Options Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table 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] Summary of Stock Option Activity and Weighted Average Exercise Prices Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Summary of Status of Nonvested Shares Schedule of Nonvested Share 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] Statement of Cash Flows [Abstract] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] OPERATING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities [Abstract] Net loss Adjustments to reconcile net loss to net cash provided by (used in) operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Stock-based compensation expense Depreciation Depreciation Amortization of purchased intangibles Deferred income taxes and other non-cash tax items 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 provided by (used in) 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 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] Excess tax benefit from the exercise of employee stock options Excess Tax Benefit from Share-based Compensation, Financing Activities 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 (used in) 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, at Carrying Value 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 Contingent earn-out in connection with acquisitions recorded in accrued expenses Noncash of Part Noncash Acquisition, Noncash Financial or Equity Instrument Consideration, Contingent Earn-Out Noncash of Part Noncash Acquisition, Noncash Financial or Equity Instrument Consideration, Contingent Earn-Out Leasehold improvements funded by landlord Noncash or Part Noncash Acquisition, Costs Noncash or Part Noncash Acquisition, Costs Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs By Report Line [Axis] Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Report Line [Domain] Accrued Liabilities Schedule of Accrued Liabilities [Table Text Block] ASSETS Assets [Abstract] CURRENT ASSETS: Assets, Current [Abstract] Cash and cash equivalents Cash held as collateral Restricted Cash and Cash Equivalents Accounts receivable, net of allowance for doubtful accounts of $1,072 and $1,184 as of March 31, 2016 and December 31, 2015, respectively Accounts Receivable, Net, Current Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Deferred tax assets, net Deferred Tax Assets, Net of Valuation Allowance, Current Total current assets Assets, Current Property and equipment, net Property, Plant and Equipment, Net Goodwill Deferred tax assets, net Deferred Tax Assets, Net of Valuation Allowance, Noncurrent 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 Tax Liabilities, Net, Noncurrent 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 Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Corporate [Member] Corporate Segment [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Revenue Segment Reporting Information, Revenue for Reportable Segment [Abstract] 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 Cost of revenue Sales and marketing Unallocated corporate expenses Segment Reporting Unallocated Corporate Expenses Segment Reporting Unallocated Corporate Expenses Operating income (loss) 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 [Member] Computer Equipment And Software [Member] Computer Equipment And Software [Member] Furniture, Equipment and Building Improvements [Member] 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 plant and equipment gross Property, Plant and Equipment, Gross Less: accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Total Engage [Member] Engage Pty Limited [Member] Engage Pty Limited [Member]. Foreign Exchange Forward [Member] Foreign Exchange Forward [Member] Asset Class [Axis] Asset Class [Axis] Fair Value by Asset Class [Domain] Asset Class [Domain] Money Market Funds [Member] Money Market Funds [Member] Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Assets, Fair Value Disclosure Assets, Fair Value Disclosure Liabilities, Fair Value Disclosure Financial and Nonfinancial Liabilities, Fair Value Disclosure Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Engage Pty Ltd. [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Business acquisition, acquisition date Business Acquisition, Effective Date of Acquisition Total consideration transferred Business Combination, Consideration Transferred Acquisition costs incurred to acquire entity Business Combination, Acquisition Related Costs Assets acquired liabilities assumed, net Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Potential earn-out consideration Change in fair value of contingent consideration Intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Payments for previous acquisition Payments for Previous Acquisition Cash payment Payments to Acquire Businesses, Gross Consideration transferred, shares Business Combination, Consideration Transferred, Equity Interests Issued and Issuable 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 Statement Geographical [Axis] Geographical [Axis] Segment, Geographical [Domain] Geographical [Domain] United States [Member] UNITED STATES Israel [Member] ISRAEL Australia [Member] AUSTRALIA Netherlands [Member] NETHERLANDS United Kingdom [Member] UNITED KINGDOM Total long-lived assets Assets, Noncurrent Compensation Related Costs [Abstract] Equity Award [Domain] Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] Balance outstanding at December 31, 2015 Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number Granted Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted Exercised Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised Forfeited Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Forfeitures Non-vested and outstanding at March 31, 2016 Expected to vest 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] Non-vested and outstanding at March 31, 2016 Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Nonvested And Outstanding, Weighted Average Grant Date Fair Value Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Nonvested And Outstanding, Weighted Average Grant Date Fair Value 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 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 March 31, 2016 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 Segment Information Segment Reporting Disclosure [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] Effect of option to purchase share of common stock on diluted net income per share Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Accrued Liabilities Accounts Payable and Accrued Liabilities Disclosure [Text Block] Other Americas [Member] Other Americas [Member] Other Americas [Member] Americas [Member] Americas [Member] EMEA [Member] EMEA [Member] APAC [Member] POSIT - ASIA PACIFIC [Member] Derivative [Table] Derivative [Table] Other Expense [Member] Other Expense [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Prepaid Expenses and Other Current Assets [Member] Prepaid Expenses and Other Current Assets [Member] Accrued Expenses And Other Liabilities [Member] Accrued Liabilities [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Foreign Currency Derivatives Contracts [Member] Foreign Exchange Contract [Member] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Not Designated as Hedging Instrument [Member] Not Designated as Hedging Instrument [Member] Derivative [Line Items] Derivative [Line Items] Notional amount Derivative, Notional Amount Fair value Derivative, Fair Value, Net Derivative assets Derivative Asset Derivative liabilities Derivative Liability Gain (losses) on derivative instruments Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net Basic Effect of assumed exercised options Weighted Average Number Diluted Shares Outstanding Adjustment Diluted SUMMARY OF OPERATIONS Summary Of Operations [Policy Text Block] The accounting policy related to summary of operations. BASIS OF PRESENTATION Unaudited Condensed Consolidated Financial Information [Policy Text Block] The accounting policy related to the unaudited condensed consolidated financial information. REVENUE RECOGNITION Revenue Recognition, Policy [Policy Text Block] NET LOSS PER SHARE Earnings Per Share, Policy [Policy Text Block] SEGMENT REPORTING 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] Summary of Financial Information by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Revenues Attributable to Domestic and Foreign Operations Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area [Table Text Block] Long-Lived Assets by Geographic Region Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block] Long Lived Assets By Geographic Region Long-lived Assets by Geographic Areas [Table Text Block] Rental expense for operating leases Operating Leases Rent Expenses Operating Leases Rent Expenses 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, 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 For Office Space [Member] Letter Of Credit For Office Space [Member] Letter Of Credit For Office Space [Member] Letter Of Credit For Security Deposit [Member] Letter Of Credit For Security Deposit [Member] Letter Of Credit For Security Deposit [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Line of Credit [Member] Line of Credit [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Letter of credit outstanding Long-term Line of Credit