Stockholders' Equity Attributable to Parent [Abstract] Stockholders' Equity Stockholders' Equity Note Disclosure [Text Block] Income Tax Disclosure [Abstract] Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract] Effective Income Tax Rate Reconciliation, Percent [Abstract] Federal statutory rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent State taxes Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent Stock-based compensation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Percent Foreign source income Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Percent Change in valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent Other Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Provision for income taxes Effective Income Tax Rate Reconciliation, Percent Property, Plant and Equipment [Abstract] Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Computer equipment Computer Equipment [Member] Computer software Computer Software, Intangible Asset [Member] Furniture, fixtures and equipment Furniture and Fixtures [Member] Scanner appliances Scanner appliances [Member] Scanner appliances [Member] Scanner appliances and other computer equipment subject to subscription Scanner appliances and other computer equipment subject to subscription [Member] Scanner appliances and other computer equipment subject to subscription [Member] Scanner appliances and other computer equipment not placed in service Scanner Appliances and Other Computer Equipment Not Placed in Service [Member] Scanner Appliances and Other Computer Equipment Not Placed in Service [Member] Leasehold improvements Leasehold Improvements [Member] Other fixed assets not placed in service Other Fixed Assets Not Placed in Service [Member] Other Fixed Assets Not Placed in Service [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Property and equipment Property, Plant and Equipment, Gross Less: accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Property and equipment, net Property, Plant and Equipment, Net Capital lease Capital Leased Assets, Gross Capital lease, accumulated depreciation Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation Depreciation and amortization expense Depreciation and Amortization of Leased Asset Depreciation and Amortization of Leased Asset 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 beginning balance Unrecognized Tax Benefits Gross increase for tax positions of prior years Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Gross decrease for tax positions of prior years Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Gross increase for tax positions of current year Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Settlements Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities Lapse of statute of limitations Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations Total unrecognized tax benefits Current deferred tax assets Deferred Tax Assets, Net, Current Current deferred tax liabilities Deferred Tax Liabilities, Net, Current Noncurrent deferred tax assets Deferred Tax Assets, Net, Noncurrent Noncurrent deferred tax liabilities Deferred Tax Liabilities, Net, Noncurrent Net deferred tax assets (liabilities) Deferred Tax Assets, Net Commitments and Contingencies Disclosure [Abstract] Leased Assets [Table] Leased Assets [Table] Leased Assets [Table] Recorded Unconditional Purchase Obligation by Category of Item Purchased [Axis] Recorded Unconditional Purchase Obligation by Category of Item Purchased [Axis] Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain] Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain] Maintenance and Support Maintenance and Support [Member] Maintenance and Support [Member] Category of Item Purchased [Axis] Category of Item Purchased [Axis] Long-term Purchase Commitment, Category of Item Purchased [Domain] Long-term Purchase Commitment, Category of Item Purchased [Domain] Capital Addition Purchase Commitments Capital Addition Purchase Commitments [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Capital Lease Obligations Capital Lease Obligations [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Leased Assets [Line Items] Leased Assets [Line Items] [Line Items] for Leased Assets [Table] Debt interest rate Debt Instrument, Interest Rate, Stated Percentage Debt face amount Debt Instrument, Face Amount Recorded unconditional purchase obligation Recorded Unconditional Purchase Obligation Rent expense Operating Leases, Rent Expense Deferred rent credit, noncurrent Deferred Rent Credit, Noncurrent Share-based Compensation [Abstract] Outstanding Shares 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 Canceled (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period Ending balance (in shares) Vested and Expected to vest (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Exercisable (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Weighted average exercise price, beginning balance (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price 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 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 Weighted average exercise price, canceled (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Weighted average exercise price, ending balance (in dollars per share) Vested and Expected to vest, weighted average exercise price (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Exercisable, Weighted average exercise price (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price Weighted Average Remaining Contractual Life (Years) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term [Abstract] Weighted average remaining contractual life Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Vested and Expected to vest, weighted average remaining contractual life Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Exercisable, weighted average remaining contractual life Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term Aggregate Intrinsic Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value [Abstract] Aggregate intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Vested and Expected to vest, aggregate intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Exercisable, aggregate intrinsic value Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value Quarterly Financial Information Disclosure [Abstract] Revenues [Abstract] Revenues [Abstract] Revenues Revenues Cost of revenues Cost of Revenue Gross profit Gross Profit Operating expenses: Operating Expenses [Abstract] Research and development Research and Development Expense Sales and marketing Selling and Marketing Expense General and administrative General and Administrative Expense Total operating expenses Operating Expenses Income from operations Operating Income (Loss) Other income (expense), net Nonoperating Income (Expense) Income before provision for income taxes Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Provision for (benefit from) income taxes Income Tax Expense (Benefit) Net income Net Income (Loss) Attributable to Parent Net income (loss) attributable to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Earnings Per Share [Abstract] Earnings Per Share [Abstract] Basic (in usd per share) Earnings Per Share, Basic Diluted (in usd per share) Earnings Per Share, Diluted Goodwill and Intangible Assets Disclosure [Abstract] Carrying value of intangible assets Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block] Intangible assets future periods amortization expense Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Statement of Cash Flows [Abstract] Statement [Table] Statement [Table] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Statement [Line Items] Statement [Line Items] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Net income Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization expense Depreciation, Depletion and Amortization Bad debt expense Provision for Doubtful Accounts Loss on disposal of property and equipment Gain (Loss) on Disposition of Property Plant Equipment Stock-based compensation Share-based Compensation Non-cash interest expense Other Noncash Expense Amortization of premiums on investments Accretion (Amortization) of Discounts and Premiums, Investments Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable Increase (Decrease) in Accounts Receivable Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Accounts payable Increase (Decrease) in Accounts Payable Accrued liabilities Increase (Decrease) in Accrued Liabilities Deferred revenues Increase (Decrease) in Deferred Revenue Other noncurrent liabilities Increase (Decrease) in Other Noncurrent Liabilities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Purchases of investments Payments to Acquire Available-for-sale Securities Sales and maturities of investments Proceeds from Sale and Maturity of Available-for-sale Securities Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Release of restricted cash Increase (Decrease) in Restricted Cash Purchases of intangible assets Payments to Acquire Intangible Assets Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds from initial public offering, net of offering costs Proceeds from Issuance of Common Stock Proceeds from exercise of stock options Proceeds from Stock Options Exercised Proceeds from early exercise of stock options Proceeds from Stock Options Exercised, Early Exercise Proceeds from Stock Options Exercised, Early Exercise Income tax benefits from exercise of stock options Excess Tax Benefit from Share-based Compensation, Financing Activities Proceeds from issuance of Series C Preferred Stock Proceeds from Issuance of Preferred Stock and Preference Stock Principal payments under capital lease obligations Repayments of Long-term Capital Lease Obligations Non-contingent payment related to acquisition Payments to Acquire Businesses, Net of Cash Acquired Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Effect of exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash and Cash Equivalents Net increase in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents at beginning of period Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents at end of period Supplemental disclosures of cash flow information Supplemental Cash Flow Information [Abstract] Cash paid for interest expense Interest Paid Cash paid for income taxes, net of refunds Income Taxes Paid, Net Non-cash investing and financing activities Noncash Investing and Financing Items [Abstract] Purchase of property and equipment recorded in accrued liabilities Capital Expenditures Incurred but Not yet Paid Purchase of property and equipment under capital lease Capital Lease Obligations Incurred Vesting of early exercised common stock options Adjustments to Additional Paid in Capital, Share-based Compensation, Stock Options, Requisite Service Period Recognition, Early Exercised Adjustments to Additional Paid in Capital, Share-based Compensation, Stock Options, Requisite Service Period Recognition, Early Exercised Conversion of convertible preferred stock to common stock Conversion of Stock, Amount Converted Issuance of common stock for acquisition of license Stock Issued Schedule of Quarterly Financial Information Schedule of Quarterly Financial Information [Table Text Block] Schedule of Earnings Per Share, Basic and Diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] 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] Award Type [Domain] Equity Award [Domain] Restricted Stock Restricted Stock [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 granted Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted Stock-based employee compensation Allocated Share-based Compensation Expense Equity Incentive Plan Annual Increase Feature [Axis] Equity Incentive Plan Annual Increase Feature [Axis] Equity Incentive Plan Annual Increase Feature [Axis] Equity Incentive Plan Annual Increase Feature [Domain] Equity Incentive Plan Annual Increase Feature [Domain] [Domain] for Equity Incentive Plan Annual Increase Feature [Axis] Increase of Number of Shares Option Increase of Number of Shares Option [Member] Increase of Number of Shares Option [Member] Increase of Percentage of Shares Outstanding Option Increase of Percentage of Shares Outstanding Option [Member] Increase of Percentage of Shares Outstanding Option [Member] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] 2012 Equity Incentive Plan 2012 Equity Incentive Plan [Member] 2012 Equity Incentive Plan [Member] 2000 Equity Incentive Plan 2000 Equity Incentive Plan [Member] 2000 Equity Incentive Plan [Member] Stock Options Employee Stock Option [Member] Equity incentive plan annual increase (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized, Annual Increase, Shares Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized, Annual Increase, Shares Equity incentive plan, annual increase, percent of shares outstanding Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized, Annual Increase, Percent of Shares Outstanding Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized, Annual Increase, Percent of Shares Outstanding Award vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Term of award Share-based Compensation Arrangement by Share-based Payment Award, Term of Award Share-based Compensation Arrangement by Share-based Payment Award, Term of Award Expiration period Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period Number of shares available for grant Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Award strike price as a percentage of market value Share-based Compensation Arrangement by Share-based Payment Award, Award Strike Price as a Percentage of Market Value Share-based Compensation Arrangement by Share-based Payment Award, Award Strike Price as a Percentage of Market Value Number of shares available for issuance Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Issuance Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Issuance Number of shares subject to repurchase (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Subject to Repurchase Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Subject to Repurchase Number of unvested shares repurchased (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Unvested Shares Repurchased Share-based Compensation Arrangement by Share-based Payment Award, Number of Unvested Shares Repurchased Liability for options early exercised Share-based Compensation Arrangement by Share Based Payment Award, Liability for Options Early Exercised Share-based Compensation Arrangement by Share Based Payment Award, Liability for Options Early Exercised Segment Reporting [Abstract] Segment Information and Information about Geographic Area Segment Reporting Disclosure [Text Block] Equity [Abstract] Foreign currency translation gain (loss), net of zero tax Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax Net unrealized gain on investments, net of zero tax Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Total Accumulated Other Comprehensive Income (Loss), Net of Tax Tax for foreign currency translation gain (loss) Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax Tax for net unrealized gain on investments Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Tax Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Tax Valuation and Qualifying Accounts [Abstract] Valuation and Qualifying Accounts Disclosure [Table] Valuation and Qualifying Accounts Disclosure [Table] Valuation Allowances and Reserves Type [Axis] Valuation Allowances and Reserves Type [Axis] Valuation Allowances and Reserves [Domain] Valuation Allowances and Reserves [Domain] Allowance for Doubtful Accounts Allowance for Doubtful Accounts [Member] Valuation and Qualifying Accounts Disclosure [Line Items] Valuation and Qualifying Accounts Disclosure [Line Items] Movement in Valuation Allowances and Reserves [Roll Forward] Movement in Valuation Allowances and Reserves [Roll Forward] Balance at Beginning of Year Valuation Allowances and Reserves, Balance Charged to Costs and Expenses Valuation Allowances and Reserves, Charged to Cost and Expense Deductions and Other Valuation Allowances and Reserves, Deductions Balance at End of Year Fair Value Disclosures [Abstract] Schedule of Cash and Cash Equivalents, Available-for-sale Securities Reconciliation Available-for-sale Securities [Table Text Block] Schedule of Assets Measured on Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Schedule of Investments Classified by Contractual Maturity Investments Classified by Contractual Maturity Date [Table Text Block] Business Combinations [Abstract] Business Combination Business Combination Disclosure [Text Block] Current Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Current Federal Tax Expense (Benefit) State Current State and Local Tax Expense (Benefit) Foreign Current Foreign Tax Expense (Benefit) Total current provision Current Income Tax Expense (Benefit) Deferred Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Deferred Federal Income Tax Expense (Benefit) State Deferred State and Local Income Tax Expense (Benefit) Foreign Deferred Foreign Income Tax Expense (Benefit) Total deferred provision (benefit) Deferred Income Tax Expense (Benefit) Provision for (benefit from) income taxes Property and equipment Property, Plant and Equipment [Table Text Block] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Geographical Area [Axis] Geographical [Axis] Segment, Geographical [Domain] Geographical [Domain] United States UNITED STATES Other Other Geographic Areas [Member] Other Geographic Areas [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Number of operating segments Number of Operating Segments Property and equipment, net Statement of Financial Position [Abstract] Allowance for Doubtful Accounts Receivable Allowance for Doubtful Accounts Receivable Preferred Stock, Par Value (in dollars per share) Preferred Stock, Par or Stated Value Per Share Preferred Stock, Shares Authorized Preferred Stock, Shares Authorized Preferred Stock, Shares Issued Preferred Stock, Shares Issued Preferred Stock, Shares Outstanding Preferred Stock, Shares Outstanding Common Stock, Par or Stated Value Per Share (in dollars per share) Common Stock, Par or Stated Value Per Share Common Stock, Shares Authorized Common Stock, Shares Authorized Common Stock, Shares, Issued Common Stock, Shares, Issued Common Stock, Shares, Outstanding Common Stock, Shares, Outstanding Deferred tax assets Deferred Tax Assets, Net [Abstract] Net operating loss carryforwards Deferred Tax Assets, Operating Loss Carryforwards Research and development credit carryforwards Deferred Tax Assets, Tax Credit Carryforwards, Research Accrued liabilities Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities Deferred revenues Deferred Tax Assets, Deferred Income Deferred rent Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Deferred Rent Intangible assets Deferred Tax Assets, Goodwill and Intangible Assets Stock-based compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Foreign Deferred Tax Assets, Foreign Taxes Deferred Tax Assets, Foreign Taxes Other Deferred Tax Assets, Other Gross deferred tax assets Deferred Tax Assets, Gross Valuation allowance Deferred Tax Assets, Valuation Allowance Net deferred tax assets Deferred Tax Assets, Net of Valuation Allowance Deferred tax liabilities Deferred Tax Liabilities, Net [Abstract] Fixed assets Deferred Tax Liabilities, Property, Plant and Equipment Intangible assets Deferred Tax Liabilities, Intangible Assets Total deferred tax liabilities Deferred Tax Liabilities, Net Assets Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Short-term investments Short-term Investments Accounts receivable, net of allowance of $389 and $331 at December 31, 2013 and 2012, respectively Accounts Receivable, Net, Current Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Total current assets Assets, Current Long-term investments Long-term Investments Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Goodwill Goodwill Other noncurrent 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 liabilities Accrued Liabilities, Current Deferred revenues, current Deferred Revenue, Current Capital lease obligations, current Capital Lease Obligations, Current Total current liabilities Liabilities, Current Deferred revenues, noncurrent Deferred Revenue, Noncurrent Income taxes payable, noncurrent Accrued Income Taxes, Noncurrent Other noncurrent liabilities Other Liabilities, Noncurrent Capital lease obligations, noncurrent Capital Lease Obligations, Noncurrent Total liabilities Liabilities Commitments and contingencies (Note 6) Commitments and Contingencies Stockholders' Equity: Preferred stock: $0.001 par value; 20,000,000 shares authorized, no shares issued and outstanding at December 31, 2013 and 2012 Preferred Stock, Value, Issued Common stock, $0.001 par value; 1,000,000,000 shares authorized, 32,375,299 and 31,420,028 shares issued and outstanding at December 31, 2013 and 2012, respectively Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Accumulated other comprehensive loss Accumulated deficit Retained Earnings (Accumulated Deficit) Total stockholders’ equity Stockholders' Equity Attributable to Parent Total liabilities and stockholders’ equity Liabilities and Equity Stock-based employee compensation Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] Fair value assumptions of options granted to employees Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Stock option activity Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of exercise price range, outstanding and vested Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] Accounting Policies [Abstract] The company and qualitative disclosure about market risk [Table] Derivative [Table] Offering Source [Axis] Offering Source [Axis] Offering Source [Axis] Offering Source [Domain] Offering Source [Domain] [Domain] for Offering Source [Axis] IPO IPO [Member] IPO Overallotment IPO Overallotment [Member] IPO Overallotment [Member] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Common Stock Common Stock [Member] Convertible Preferred Stock Convertible Preferred Stock [Member] 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] Software and software development costs Software and Software Development Costs [Member] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Preferred Stock Preferred Stock [Member] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Customer concentration risk Customer Concentration Risk [Member] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Accounts receivable Accounts Receivable [Member] Derivative, by Nature [Axis] Derivative, by Nature [Axis] Derivative Contract Type [Domain] Derivative Contract [Domain] Forward contracts Forward Contracts [Member] The company and qualitative disclosure about market risk [Line Items] Derivative [Line Items] Initial Public Offering Initial Public Offering [Abstract] Initial Public Offering [Abstract] Shares sold in IPO, including existing shares Shares Sold in Initial Public Offering, Including Existing Shares Shares Sold in Initial Public Offering, Including Existing Shares Shares sold in initial public offering, including existing shares, price per share Shares sold in initial public offering, including existing shares, price per share Shares sold in initial public offering, including existing shares, price per share Issuance of common stock upon initial public offering, net of offering costs (in shares) Stock Issued During Period, Shares, New Issues Shares sold by existing stockholders during initial public offering Shares Sold by Existing Stockholders During Initial Public Offering Shares Sold by Existing Stockholders During Initial Public Offering Proceeds from issuance of initial public offering Proceeds from Issuance Initial Public Offering Sale of stock, expenses incurred in offering Sale of Stock, Expenses Incurred in Offering Sale of Stock, Expenses Incurred in Offering Conversion of stock, shares converted Conversion of Stock, Shares Converted Concentration of Credit Risk Concentration of Credit Risk [Abstract] Concentration of Credit Risk [Abstract] Concentration risk, number of customers Concentration risk, number of customers Concentration risk, number of customers Property Equipment, Net Property, plant and equipment, useful life Property, Plant and Equipment, Useful Life Goodwill and Intangible Assets Goodwill and Intangible Assets, Net [Abstract] Goodwill and Intangible Assets, Net [Abstract] Finite-lived intangible asset, useful life Finite-Lived Intangible Asset, Useful Life Software Development Costs Research and Development [Abstract] Capitalized development costs Finite-Lived Intangible Assets, Gross Derivative Financial Instruments Summary of Derivative Instruments [Abstract] Derivative, number of instruments held Derivative, Number of Instruments Held Derivative, notional amount Derivative, Notional Amount Foreign currency contract, asset, fair value disclosure Foreign Currency Contract, Asset, Fair Value Disclosure Derivative instruments not designated as hedging instruments, loss Derivative Instruments Not Designated as Hedging Instruments, Loss Foreign currency transaction gain, before tax Foreign Currency Transaction Gain, before Tax Foreign currency transaction gain (loss), before tax Foreign Currency Transaction Gain (Loss), before Tax Advertising Expenses Marketing and Advertising Expense [Abstract] Advertising expense Advertising Expense Reverse Stock Split Reverse Stock Split [Abstract] Reverse Stock Split [Abstract] Stockholders' equity, reverse stock split Stockholders' Equity, Reverse Stock Split Stockholders' equity note, stock split, conversion ratio Stockholders' Equity Note, Stock Split, Conversion Ratio Conversion of Stock, Amount Converted Other Income and Expenses [Abstract] Schedule of Other Nonoperating Income (Expense) Schedule of Other Nonoperating Income (Expense) [Table Text Block] Other Income (Expense), Net Other Income and Other Expense Disclosure [Text Block] Statement of Comprehensive Income [Abstract] Change in foreign currency translation gain (loss), net of zero tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Change in net unrealized gain on investments, net of zero tax Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Less: reclassification adjustment for net gain included in net income Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Net change, net of zero tax Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Other comprehensive income (loss), net Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Property and Equipment, net Property, Plant and Equipment Disclosure [Text Block] Net Income Per Share Attributable to Common Stockholders Earnings Per Share [Text Block] Statement of Stockholders' Equity [Abstract] Additional Paid-In Capital Additional Paid-in Capital [Member] Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Income (Loss) [Member] Accumulated Deficit Retained Earnings [Member] Increase (Decrease) in Temporary Equity [Roll Forward] Increase (Decrease) in Temporary Equity [Roll Forward] Convertible Preferred Stock balance Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests Convertible Preferred Stock, balance (in shares) Temporary Equity, Shares Outstanding Convertible Preferred Stock, Issuance of Series C Preferred Stock upon exercise of warrants Temporary Equity, Stock Issued During Period, Value, New Issues Convertible Preferred Stock, Issuance of Series C Preferred Stock upon exercise of warrants (shares) Temporary Equity, Stock Issued During Period, Shares, New Issues Temporary Equity, Stock Issued During Period, Shares, New Issues Convertible Preferred Stock, Conversion of preferred stock to common stock upon initial public offering Temporary Equity, Stock Issued During Period, Value, Conversion of Convertible Securities Temporary Equity, Stock Issued During Period, Value, Conversion of Convertible Securities Convertible Preferred Stock, Conversion of preferred stock to common stock upon initial public offering (in shares) Temporary Equity, Stock Issued During Period, Shares, Conversion of Convertible Securities Temporary Equity, Stock Issued During Period, Shares, Conversion of Convertible Securities Convertible Preferred Stock, balance (in shares) Convertible Preferred Stock balance Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance Balance (in shares) Shares, Outstanding Foreign currency translation Issuance of common stock upon initial public offering, net of offering costs Stock Issued During Period, Value, New Issues Conversion of preferred stock to common stock upon initial public offering Stock Issued During Period, Value, Conversion of Convertible Securities Conversion of preferred stock to common stock upon initial public offering (shares) Stock Issued During Period, Shares, Conversion of Convertible Securities Issuance of common stock upon exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Issuance of common stock upon exercise of stock options (shares) Change in unrealized gain (loss) on investments Income tax benefits from exercise of stock options Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation Repurchase of unvested early exercised stock options Stock Repurchased During Period, Value Repurchase of unvested early exercised stock options (shares) Stock Repurchased During Period, Shares Issuance of common stock in exchange for services Stock Issued During Period, Value, Issued for Services Issuance of common stock in exchange for services (shares) Stock Issued During Period, Shares, Issued for Services Issuance of common stock for acquisition of license Stock Issued During Period, Value, Purchase of Assets Issuance of common stock for acquisition of license (shares) Stock Issued During Period, Shares, Purchase of Assets Stock-based compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Other adjustments Adjustments to Additional Paid in Capital, Other Balance Balance (in shares) Income Taxes Income Tax Disclosure [Text Block] Operating Leases Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] 2014 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2015 Operating Leases, Future Minimum Payments, Due in Two Years 2016 Operating Leases, Future Minimum Payments, Due in Three Years 2017 Operating Leases, Future Minimum Payments, Due in Four Years 2018 Operating Leases, Future Minimum Payments, Due in Five Years 2019 Operating Leases, Future Minimum Payments, Due Thereafter Total minimum lease payments Operating Leases, Future Minimum Payments Due Capital Leases Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] 2014 Capital Leases, Future Minimum Payments Due, Next Twelve Months 2015 Capital Leases, Future Minimum Payments Due in Two Years 2016 Capital Leases, Future Minimum Payments Due in Three Years 2017 Capital Leases, Future Minimum Payments Due in Four Years 2018 Capital Leases, Future Minimum Payments Due in Five Years 2019 Capital Leases, Future Minimum Payments Due Thereafter Total minimum lease payments Capital Leases, Future Minimum Payments Due Less amount representing interest Capital Leases, Future Minimum Payments, Interest Included in Payments Present value of minimum payments Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments Less current portion Expected term Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Sales and other taxes, current Sales and Excise Tax Payable, Current The Company and Summary of Significant Accounting Policies Business Description and Accounting Policies [Text Block] Schedule of shares reserved for future issuance Schedule of Shares Reserved for Future Issuance [Table Text Block] Schedule of Shares Reserved for Future Issuance [Table Text Block] Schedule of accumulated other comprehensive income (loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] Money market funds Money Market Funds [Member] Commercial paper Commercial Paper [Member] Corporate bonds Corporate Bond Securities [Member] Municipal bonds Municipal Bonds [Member] U.S. government agencies US Government Agencies Debt Securities [Member] Asset-backed securities Asset-backed Securities [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Cash and Cash Equivalents Cash and Cash Equivalents [Member] Short-term Investments Available-for-sale Securities, Line Item [Member] Available-for-sale Securities, Line Item [Member] Long-Term Investments Long-Term Investments [Member] Long-Term Investments [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] Cash and cash equivalents Cash Amortized cost, total Available-for-sale Securities, Amortized Cost Basis Unrealized Gains Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. Unrealized Losses Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. Fair value Available-for-sale Securities, Current Income (Loss) from Continuing Operations Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract] Domestic Income (Loss) from Continuing Operations before Income Taxes, Domestic Foreign Income (Loss) from Continuing Operations before Income Taxes, Foreign Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Numerator: Numerator [Abstract] Numerator [Abstract] Net income attributable to participating securities Participating Securities, Distributed and Undistributed Earnings Net income attributable to common stockholders - basic Undistributed earnings reallocated to participating securities Undistributed Earnings Allocated to Participating Securities Net income attributable to common stockholders - diluted Net Income (Loss) Available to Common Stockholders, Diluted Denominator: Denominator [Abstract] Denominator [Abstract] Weighted-average shares used in computing net income per share attributable to common stockholders - basic Weighted Average Number of Shares Outstanding, Basic Effect of potentially dilutive securities: Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] Convertible preferred stock (in shares) Incremental Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock Common stock options (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Warrants (in shares) Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants Contingently issuable shares related to an acquisition (in shares) Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares Weighted - average shares used in computing net income (loss) per share attributable to common stockholders - diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Basic (usd per share) Diluted (usd per share) Antidilutive Securities Antidilutive Securities [Abstract] Antidilutive Securities [Abstract] Common stock options (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Goodwill and Intangible Assets, Net Goodwill and Intangible Assets Disclosure [Text Block] Stockholders' Equity [Table] Stockholders Equity [Table] Stockholders Equity [Table] Stockholders Equity [Line Items] Stockholders Equity [Line Items] [Line Items] for Stockholders Equity [Table] Common Stock Shareholders' Equity, Common Stock [Abstract] Shareholders' Equity, Common Stock [Abstract] Options outstanding under equity incentive plans Shares available for future grants under equity incentive plans Total shares reserved for future issuance Common Stock, Capital Shares Reserved for Future Issuance Convertible Preferred Stock and Preferred Stock Shareholders' Equity, Convertible Preferred Stock and Preferred Stock [Abstract] Shareholders' Equity, Convertible Preferred Stock and Preferred Stock [Abstract] Convertible preferred stock, shares authorized Temporary Equity, Shares Authorized Convertible preferred stock, shares issued Temporary Equity, Shares Issued Convertible preferred stock outstanding Preferred stock, shares authorized Preferred stock, par value per share (in dollars per share) Employee Stock and Benefit Plans Compensation and Employee Benefit Plans [Text Block] Income Tax [Table] Income Tax [Table] Income Tax [Table] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] Internal Revenue Service (IRS) [Member] Internal Revenue Service (IRS) [Member] State and Local Jurisdiction [Member] State and Local Jurisdiction [Member] Tax Credit Carryforward [Axis] Tax Credit Carryforward [Axis] Tax Credit Carryforward, Name [Domain] Tax Credit Carryforward, Name [Domain] Research and Development Credits [Member] Research Tax Credit Carryforward [Member] Income Tax [Line Items] Income Tax [Line Items] Income Tax Valuation allowance increase (decrease) Valuation Allowance, Deferred Tax Asset, Change in Amount Operating loss carryforwards Operating Loss Carryforwards Tax credit carryforward Tax Credit Carryforward, Amount Undistributed earnings of foreign subsidiaries Undistributed Earnings of Foreign Subsidiaries Unrecognized tax benefits that would impact effective tax rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] 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] Fair Value Estimate of Fair Value Measurement [Member] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Recurring Basis Fair Value, Measurements, Recurring [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, Fair Value Disclosure [Abstract] Assets, Fair Value Disclosure [Abstract] Available-for-sale securities, fair value Available-for-sale Securities 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] Nemean Networks, LLC Nemean Networks, LLC [Member] Nemean Networks, LLC [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Consideration for acquisition Business Combination, Consideration Transferred Non-contingent payment Payments to Acquire Businesses, Gross Non-contingent payment, number of shares Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Quarterly Financial Information (Unaudited) Quarterly Financial Information [Text Block] Schedule of Geographical Breakdown of Income (Loss) Before Provision for (Benefit From) Income Taxes Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] Schedule of Provision for (Benefit From) Income Taxes Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule of Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Schedule of Unrecognized Tax Benefits Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis] Income Statement Location [Axis] Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Report Line [Domain] Income Statement Location [Domain] Cost of revenues Cost of Sales [Member] Research and development Research and Development Expense [Member] Sales and marketing Selling and Marketing Expense [Member] General and administrative General and Administrative Expense [Member] Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Unrecognized employee compensation cost Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Unrecognized employee compensation cost, period for recognition Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Non-employee share-based compensation expense Issuance of Stock and Warrants for Services or Claims Income Statement [Abstract] Revenues Other income (expense), net: Other Income (Expense), Net [Abstract] Other Income (Expense), Net [Abstract] Interest expense Interest Expense Interest income Investment Income, Interest Other income (expense), net Other Nonoperating Income (Expense) Total other income (expense), net Provision for income taxes Net income attributable to common stockholders Net income per share attributable to common stockholders: Weighted average shares used in computing net income per share attributable to common stockholders: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic (in shares) Diluted (in shares) Schedule of Goodwill and Intangible Assets [Table] Schedule of Goodwill and Intangible Assets [Table] Schedule of Goodwill and Intangible Assets [Table] Existing technology Developed Technology Rights [Member] Patent license Patents [Member] Non-competition agreements and other Non-competition Agreements and Other Intangible Assets [Member] [Member] Non-competition Agreements and Other Intangible Assets [Member] [Member] Schedule of Goodwill and Intangible Assets [Line Items] Schedule of Goodwill and Intangible Assets [Line Items] [Line Items] for Schedule of Goodwill and Intangible Assets [Table] Estimated Lives Cost Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Net Book Value Finite-Lived Intangible Assets, Net Intangible assets not subject to amortization Indefinite-Lived Intangible Assets (Excluding Goodwill) Total intangible assets, net Amortization of intangible assets Amortization of Intangible Assets Fair Value of Financial Instruments Fair Value Disclosures [Text Block] 2014 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 2015 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2016 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2017 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2018 Finite-Lived Intangible Assets, Amortization Expense, Year Five 2019 and thereafter Finite-Lived Intangible Assets, Amortization Expense, after Year Five Revenues and property and equipment, net, by geographic area Schedule of Segment Reporting Information, by Segment [Table Text Block] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Schedule II Schedule of Valuation and Qualifying Accounts Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] 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] $0.10 - $1.90 Exercise Price Range One [Member] Exercise Price Range One [Member] $2.10 - $2.80 Exercise Price Range Two [Member] Exercise Price Range Two [Member] $3.80 - $3.80 Exercise Price Range Three [Member] Exercise Price Range Three [Member] $4.10 - $5.10 Exercise Price Range Four [Member] Exercise Price Range Four [Member] $5.90 - $10.77 Exercise Price Range Five [Member] Exercise Price Range Five [Member] $12.68 - $16.68 Exercise Price Range Six [Member] Exercise Price Range Six [Member] $20.80 - $23.81 Exercise Price Range Seven [Member] Exercise Price Range Seven [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, lower limit (in dollar per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit Exercise price range, upper limit (in dollar per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit Number of shares, outstanding Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options Weighted average exercise price per share, outstanding (in dollar per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price Weighted average remaining contractual life, outstanding Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term Number of shares, vested Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Vested Options Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Vested Options Weighted average exercise price per share, vested (in dollar per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Vested Options, Weighted Average Exercise Price Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Vested Options, Weighted Average Exercise Price Weighted average grant date fair value (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Grant date fair value Share-based Compensation Arrangement by Share-based Payment Award, Options, Granted in Period, Total Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Granted in Period, Total Fair Value Intrinsic value of options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Document and Entity Information [Abstract] Document and Entity Information [Abstract] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus 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 Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Public Float Entity Public Float Foreign exchange gains (losses) Other income (expense) Other non operating income expense other Other non operating income expense other Other income (expense), net Basis of presentation Basis of Accounting, 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] Cash, cash equivalents and short-term and long-term investments Cash, Cash Equivalents and Short-Term and Long-Term Investments Policy [Policy Text Block] Cash, Cash Equivalents and Short-Term and Long-Term Investments Policy [Policy Text Block] Accounts receivable Trade and Other Accounts Receivable, Policy [Policy Text Block] Property and equipment, net Property, Plant and Equipment, Policy [Policy Text Block] Impairment of long-lived assets Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Goodwill and intangible assets Goodwill and Intangible Assets, Policy [Policy Text Block] Software development cost Research, Development, and Computer Software, Policy [Policy Text Block] Derivative financial instruments Derivatives, Reporting of Derivative Activity [Policy Text Block] Share-based compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Revenue recognition Revenue Recognition, Policy [Policy Text Block] Advertising expenses Advertising Costs, Policy [Policy Text Block] Income taxes Income Tax, Policy [Policy Text Block] Other comprehensive income (loss) Comprehensive Income, Policy [Policy Text Block] Foreign currency translation and transactions Foreign Currency Transactions and Translations Policy [Policy Text Block] Fair value measurement Fair Value Measurement, Policy [Policy Text Block] Net income per share attributable to common stockholders Earnings Per Share, Policy [Policy Text Block] Recent accounting pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Reverse stock split Reverse Stock Split, Policy [Policy Text Block] Reverse Stock Split, Policy [Policy Text Block] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Line Items] Schedule of Available-for-sale Securities [Line Items] Mature within One Year Available-for-sale Securities, Debt and Equity Maturities, Next Twelve Months, Fair Value Available-for-sale Securities, Debt and Equity Maturities, Next Twelve Months, Fair Value After One Year through Two Years Available-for-sale Securities, Debt and Equity Maturities, Year One through Two, Fair Value Available-for-sale Securities, Debt and Equity Maturities, Year One through Two, Fair Value Over Two Years Available-for-sale Securities, Debt and Equity Maturities, After Year Two, Fair Value Available-for-sale Securities, Debt and Equity Maturities, After Year Two, Fair Value Fair Value Schedule of Future Minimum Lease Payments for Capital and Operating Leases Schedule of Future Minimum Lease Payments for Operating and Capital Leases [Table Text Block] Schedule of Future Minimum Lease Payments for Operating and Capital Leases [Table Text Block]