Fair Value Disclosures [Abstract] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] 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] 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] Cash Cash [Member] Money market funds Money Market Funds [Member] U.S. government agencies US Government Agencies Debt Securities [Member] Commercial paper Commercial Paper [Member] Corporate bonds Corporate Bond Securities [Member] Asset-backed securities Asset-backed Securities [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] Amortized cost, total Available-for-sale Securities, Amortized Cost Basis Unrealized Gains Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax Unrealized Losses Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Fair value Available-for-sale Securities, Current 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 Available-for-sale Securities Segment Reporting [Abstract] Segment Information and Information about Geographic Area Segment Reporting Disclosure [Text Block] Revenue from Contract with Customer [Abstract] Revenue, Initial Application Period Cumulative Effect Transition [Table] Revenue, Initial Application Period Cumulative Effect Transition [Table] Products and Services [Axis] Products and Services [Axis] Products and Services [Domain] Products and Services [Domain] Subscription Revenue Subscription Revenue [Member] Subscription Revenue [Member] Initial Application Period Cumulative Effect Transition [Axis] Initial Application Period Cumulative Effect Transition [Axis] Initial Application Period Cumulative Effect Transition [Domain] Initial Application Period Cumulative Effect Transition [Domain] Difference between Revenue Guidance in Effect before and after Topic 606 Difference between Revenue Guidance in Effect before and after Topic 606 [Member] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Accounting Standards Update 2014-09 Accounting Standards Update 2014-09 [Member] Revenue, Initial Application Period Cumulative Effect Transition [Line Items] Revenue, Initial Application Period Cumulative Effect Transition [Line Items] Retained earnings Retained Earnings (Accumulated Deficit) Commission asset balance Commission Asset Commission Asset Deferred tax liability Deferred Tax Liabilities, Net Amortization of commissions assets Amortization of Deferred Sales Commissions Revenue recognized Revenue from Contract with Customer, Excluding Assessed Tax Unbilled contracts Unbilled Receivables, Not Billable Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Deferred Revenue Arrangement Type [Axis] Deferred Revenue Arrangement Type [Axis] Deferred Revenue [Domain] Deferred Revenue [Domain] ASC 606 Operating Lease Expected Revenue Accounting Standards Update 2016-02 [Member] Contract with Customer, Sales Channel [Axis] Contract with Customer, Sales Channel [Axis] Contract with Customer, Sales Channel [Domain] Contract with Customer, Sales Channel [Domain] Direct Sales Channel, Directly to Consumer [Member] Partner Sales Channel, Through Intermediary [Member] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Revenues Commitments and Contingencies Disclosure [Abstract] Operating Leases Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] 2018 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2019 Operating Leases, Future Minimum Payments, Due in Two Years 2021 Operating Leases, Future Minimum Payments, Due in Three Years 2022 Operating Leases, Future Minimum Payments, Due in Four Years Operating Leases, Future Minimum Payments, Due in Five Years Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total minimum lease payments Operating Leases, Future Minimum Payments Due Income Statement [Abstract] Revenues 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: Other Income (Expense), Net [Abstract] Other Income (Expense), Net [Abstract] Interest expense Interest Expense Interest income Investment Income, Interest Other expense, net Other Nonoperating Income (Expense) Total other income (expense), net Nonoperating Income (Expense) Income before 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 income Net Income (Loss) Attributable to Parent Net income per share: Earnings Per Share [Abstract] Basic (usd per share) Earnings Per Share, Basic Diluted (usd per share) Earnings Per Share, Diluted Weighted average shares used in computing net income per share: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Business Combinations [Abstract] Business Combination Business Combination Disclosure [Text Block] Deferred Revenue Arrangement, by Type [Table] Deferred Revenue Arrangement, by Type [Table] Operating Leases Deferred Revenue Arrangement [Line Items] Deferred Revenue Arrangement [Line Items] Deferred revenue, current Deferred Revenue, Current Deferred revenue, noncurrent Deferred Revenue, Noncurrent Total Deferred Revenue Net Income Per Share Attributable to Common Stockholders Earnings Per Share [Text Block] 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] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Forward contracts Forward Contracts [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] Foreign currency contract, asset, fair value disclosure Foreign Currency Contract, Asset, Fair Value Disclosure Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] 2000 Equity Incentive Plan 2000 Equity Incentive Plan [Member] 2000 Equity Incentive Plan [Member] 2012 Equity Incentive Plan 2012 Equity Incentive Plan [Member] 2012 Equity Incentive Plan [Member] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Preferred Stock Preferred Stock [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Options and RSUs outstanding under equity incentive plans Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Shares available for future grants under an equity incentive plan Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Total shares reserved for future issuance Common Stock, Capital Shares Reserved for Future Issuance Preferred Stock Preferred Stock, Number of Shares, Par Value and Other Disclosures [Abstract] Preferred stock, shares authorized Preferred Stock, Shares Authorized Preferred stock, par value per share (in dollars per share) Preferred Stock, Par or Stated Value Per Share Preferred stock, shares issued Preferred Stock, Shares Issued Preferred stock, shares outstanding Preferred Stock, Shares Outstanding Statement of Cash Flows [Abstract] 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 Amortization of premiums and accretion of discounts on investments Accretion (Amortization) of Discounts and Premiums, Investments Excess tax benefits from stock-based compensation Excess Tax Benefit from Share-based Compensation, Operating Activities Deferred income taxes Deferred Income Taxes and Tax Credits 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 Payments to Acquire Businesses, Gross Payments to Acquire Businesses, Gross Payments to Acquire Investments Payments to Acquire Investments Capitalized software development costs Capitalized Software Development Costs Capitalized Software Developpment Costs Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Payments for Repurchase of Common Stock Payments for Repurchase of Common Stock Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds from exercise of stock options Proceeds from Stock Options Exercised Payments Related to Tax Withholding for Share-based Compensation Payments Related to Tax Withholding for Share-based Compensation Excess tax benefits from stock-based compensation Excess Tax Benefit from Share-based Compensation, Financing Activities Repayments of Long-term Capital Lease Obligations Repayments of Long-term Capital Lease Obligations Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities 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] Business acquisitions recorded in Intangible Assets and Accrued liabilities Noncash or Part Noncash Acquisition, Net Nonmonetary Assets Acquired (Liabilities Assumed) Purchases of property and equipment recorded in accounts payable and accrued liabilities Capital Expenditures Incurred but Not yet Paid Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Accounting Policies [Abstract] The Company and Summary of Significant Accounting Policies Business Description and Accounting Policies [Text Block] Schedule of Future Minimum Lease Payments for Operating Leases Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Share-based Compensation [Abstract] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Restricted Stock Units Restricted Stock Units (RSUs) [Member] Number of Shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Beginning balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Canceled (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Ending balance (in shares) Expected to vest as of December 31, 2016 Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Vested And Expected To Vest, Outstanding, Number Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Vested And Expected To Vest, Outstanding, Number Weighted-Average Grant Date Fair Value Per Share Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Beginning balance (usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Canceled (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Ending balance (usd per share) Expected to vest as of December 31, 2016 Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Vested And Expected To Vest, Outstanding, Weighted Average Exercise Price Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Vested And Expected To Vest, Outstanding, Weighted Average Exercise Price 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] 1Mobility 1Mobility [Member] 1Mobility [Member] Layered Insight Layered Insights [Member] Layered Insights [Member] Nevis Nevis Networks Private Limited [Member] Nevis Networks Private Limited [Member] NetWatcher Defensative, LLC (NetWatcher) [Member] Defensative, LLC (NetWatcher) [Member] Nevis and NetWatcher Nevis And NetWatcher [Member] Nevis And NetWatcher [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Purchase Consideration Business Combination, Consideration Transferred Net Tangible Assets Acquired/ (liabilities assumed) Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Purchased Intangible Assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Goodwill Goodwill Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities The company and qualitative disclosure about market risk [Table] Derivative [Table] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Adjustments for Change in Accounting Principle [Axis] Adjustments for Change in Accounting Principle [Axis] Adjustments for Change in Accounting Principle [Domain] Adjustments for Change in Accounting Principle [Domain] Accounting Standards Update 2016-09 Accounting Standards Update 2016-09 [Member] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Scenario, Forecast Scenario, Forecast [Member] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Retained earnings Retained Earnings [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] 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] Foreign Exchange Contract [Member] Foreign Exchange Contract [Member] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Scanner appliances Scanner appliances [Member] Scanner appliances [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] The company and qualitative disclosure about market risk [Line Items] Derivative [Line Items] Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Capitalized Computer Software, Gross Capitalized Computer Software, Gross Capitalized Computer Software, Unamortized Capitalized Computer Software, Unamortized Capitalized Computer Software, Unamortized Long-term investments Long-term Investments 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 [Abstract] 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 software development costs Cost of intangible assets Finite-Lived Intangible Assets, Gross Accumulated amortization of intangible assets Finite-Lived Intangible Assets, Accumulated Amortization Derivative Financial Instruments Summary of Derivative Instruments [Abstract] Derivative, notional amount Derivative, Notional Amount Other foreign currency transaction gains (losses) Other Foreign Currency Transaction Gain (Loss), Before Tax Other Foreign Currency Transaction Gain (Loss), Before Tax Total foreign exchange loss, net Foreign Currency Transaction Gain (Loss) Including Derivatives, Before Tax Foreign Currency Transaction Gain (Loss) Including Derivatives, Before Tax Advertising Expenses Marketing and Advertising Expense [Abstract] Advertising expense Advertising Expense Income Taxes Income Tax Disclosure [Abstract] Tax Cuts and Jobs Act of 2017, Provisional income tax expense (benefit) Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit) Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Provisional Income Tax Expense (Benefit) Noncurrent deferred tax assets Deferred Tax Assets, Net, Noncurrent Cumulative effect adjustment Cumulative Effect of New Accounting Principle in Period of Adoption Restricted cash Restricted Cash and Cash Equivalents, Noncurrent Right of use asset Operating Lease, Right-of-Use Asset Operating lease, liability Operating Lease, Liability Deferred rent Deferred Rent Receivables, Net 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 Foreign tax credit carryforwards Deferred Tax Assets, Tax Credit Carryforwards, Foreign Accrued liabilities Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities Deferred revenues Deferred Tax Assets, Deferred Income 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 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 Net deferred tax assets Deferred Tax Assets, Net Statement of Comprehensive Income [Abstract] Change in net unrealized loss on investments, net of tax Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Reclassification adjustment for net change realized and included in net income, net of tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Total change in unrealized gain (loss) on marketable securities, net of tax Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Change in net unrealized loss, net of tax Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Other comprehensive (loss) income, net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Asset Acquisition [Axis] Asset Acquisition [Axis] Asset Acquisition [Axis] Asset Acquisition [Domain] Asset Acquisition [Domain] [Domain] for Asset Acquisition [Axis] Adya Assets Acquisition [Member] Adya Assets Acquisition [Member] Adya Assets Acquisition [Member] Total purchase price Reserve fund Business Combination, Consideration Transferred, Other Business Combination, Additional Consideration Business Combination, Additional Consideration Business Combination, Additional Consideration Business Combination, Earnout Milestone Business Combination, Earnout Milestone Business Combination, Earnout Milestone Business Combination, Future Payments To Key Employees Business Combination, Future Payments To Key Employees Business Combination, Future Payments To Key Employees Cash payment to acquire businesses Future payments for continued employment, year 1 Future Payments For Continued Employment, First Anniversary Future Payments For Continued Employment, First Anniversary Future payments for continued employment, year 2 Future Payments For Continued Employment, Second Anniversary Future Payments For Continued Employment, Second Anniversary Estimated useful life of technology-based intangible assets Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Payments For Asset Acquisitions Payments For Asset Acquisitions Payments For Asset Acquisitions Payments For Asset Acquisitions, Payable In Future, Round 1 Payments For Asset Acquisitions, Payable In Future, Round 1 Payments For Asset Acquisitions, Payable In Future, Round 1 Payments For Asset Acquisitions, Payable In Future, Round 2 Payments For Asset Acquisitions, Payable In Future, Round 2 Payments For Asset Acquisitions, Payable In Future, Round 2 Valuation and Qualifying Accounts [Abstract] 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, Additions for Charges to Cost and Expense Deductions and Other Valuation Allowances and Reserves, Deductions Balance at End of Year 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 Incremental federal rate benefit previously not recognized Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent Federal and state research and development credit Effective Income Tax Rate Reconciliation, Tax Credit, Research, Percent Other Effective Income Tax Rate Reconciliation, Other Adjustments, Percent Provision for (benefit from) income taxes Effective Income Tax Rate Reconciliation, Percent Commission asset balances Contract With Customer, Commission Asset Balances [Table Text Block] Contract With Customer, Commission Asset Balances [Table Text Block] Contract liabilities Contract with Customer, Asset and Liability [Table Text Block] Accounts receivable, net Contract With Customer, Accounts Receivable Disclosure [Table Text Block] Contract With Customer, Accounts Receivable Disclosure [Table Text Block] Expected revenue from contracts Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] Revenue by sales channel Disaggregation of Revenue [Table Text Block] Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Common Stock Common Stock [Member] Additional Paid-In Capital Additional Paid-in Capital [Member] Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Accumulated Deficit Statement [Line Items] Statement [Line Items] Accumulated deficit Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance Stockholders' Equity Attributable to Parent Balance (in shares) Shares, Outstanding Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Change in unrealized loss on investments 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) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Stock Repurchased During Period, Shares Stock Repurchased During Period, Shares Treasury Stock, Value, Acquired, Cost Method Stock Repurchased During Period, Value Issuance of common stock upon vesting of restricted stock units (in shares) Stock Issued During Period, Shares, Restricted Stock Award, Vested Stock Issued During Period, Shares, Restricted Stock Award, Vested Excess tax benefits from stock-based compensation Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation 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 Taxes from release of the restricted share units Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition Taxes related to net share settlement of equity awards, shares Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition, Shares Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition, Shares Stock-based compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Cumulative effect of a change in accounting principle related to stock-based compensation Balance Balance (in shares) 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] Commission asset, current Commission Asset, Current Commission Asset, Current Commission asset, noncurrent Commission Asset, Non-current Commission Asset, Non-current Contracts expected to be billed remainder of year Unbilled Receivables, Expected To Be Billed In Remainder Of Year Unbilled Receivables, Expected To Be Billed In Remainder Of Year Unbilled Receivables, Expected To Be Billed In 2019 Unbilled Receivables, Expected To Be Billed In Year Two Unbilled Receivables, Expected To Be Billed In Year Two Unbilled Receivables, Expected To Be Billed In 2020 Unbilled Receivables, Expected To Be Billed In Year Three Unbilled Receivables, Expected To Be Billed In Year Three Unbilled Receivables, Expected To Be Billed In 2021 Unbilled Receivables, Expected To Be Billed In Year Four Unbilled Receivables, Expected To Be Billed In Year Four Unbilled Receivables, Expected To Be Billed In 2022 Unbilled Receivables, Expected To Be Billed In Year Five Unbilled Receivables, Expected To Be Billed In Year Five Unbilled Receivables, Expected To Be Billed Thereafter Unbilled Receivables, Expected To Be Billed Thereafter Unbilled Receivables, Expected To Be Billed Thereafter Unbilled Receivables, Not Billable 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] 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 Weighted Remaining Average Lives Finite-Lived Intangible Assets, Remaining Amortization Period Cost 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 Intangible Assets, Net (Excluding Goodwill) Amortization of intangible assets Amortization of Intangible Assets Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Computer equipment Computer Equipment [Member] Computer software Computer Software, Intangible Asset [Member] Furniture, fixtures and equipment Furniture and Fixtures [Member] Equipment Under Capital Lease [Member] Equipment Under Capital Lease [Member] Equipment Under Capital Lease [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 Depreciation and amortization expense Depreciation, Depletion And Amortization, Excluding Intangible Asset Amortization Depreciation, Depletion And Amortization, Excluding Intangible Asset Amortization Loss on disposal of office facilities Assets Disposed of by Method Other than Sale, in Period of Disposition, Gain (Loss) on Disposition Gross amount of abandoned costs Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Noncurrent Accumulated depreciation on abandoned facility Disposal Group, Including Discontinued Operation, Depreciation and Amortization Income Taxes Income Tax Disclosure [Text Block] Employee Stock and Benefit Plans Compensation and Employee Benefit Plans [Text Block] Other Income and Expenses [Abstract] Schedule of Other Nonoperating Income (Expense) Schedule of Other Nonoperating Income (Expense) [Table Text Block] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Foreign exchange losses Foreign Currency Transaction Gain (Loss), before Tax Other expense Other non operating income expense other Other non operating income expense other Other income (expense), net Quarterly 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