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Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Short-term marketable securities Marketable Securities, Current Accounts receivable, net of allowance of $558 and $683 as of September 30, 2019 and December 31, 2018, respectively Accounts Receivable, Net, Current Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Total current assets Assets, Current Long-term marketable securities Marketable Securities, Noncurrent Property and equipment, net Property, Plant and Equipment, Net Operating Lease, Right-of-Use Asset Operating Lease, Right-of-Use Asset Deferred tax assets, net Deferred Tax Assets, Net, Noncurrent Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Long-term investment Long-term Investments Goodwill Goodwill Restricted cash Restricted Cash and Cash Equivalents, Noncurrent 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 Contract with Customer, Liability, Current Finance Lease, Liability, Current Operating Lease, Liability, Current Operating Lease, Liability, Noncurrent Operating Lease, Liability, Noncurrent Total current liabilities Liabilities, Current Deferred revenues, noncurrent Contract with Customer, Liability, Noncurrent Other noncurrent liabilities Other Liabilities, Noncurrent Total liabilities Liabilities Commitments and contingencies (Note 8) Commitments and Contingencies Stockholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, $0.001 par value; 20,000,000 shares authorized, no shares issued and outstanding at September 30, 2019 and December 31, 2018 Preferred Stock, Value, Issued Common stock, $0.001 par value; 1,000,000,000 shares authorized; 38,750,803 and 39,015,034 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[Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Stock Options Employee Stock Option [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Antidilutive Securities [Abstract] Antidilutive Securities [Abstract] Antidilutive securities (shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Cash Equivalents [Member] Cash Equivalents [Member] Cash [Member] Cash [Member] Money market funds Money Market Funds [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] Current Assets [Member] Current Assets [Member] Current Assets [Member] Long-term investments Noncurrent Assets [Member] Noncurrent Assets [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, Fair Value Disclosure Cash and Cash Equivalents, Fair Value Disclosure Unrealized Gains Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax Unrealized (Losses) Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax Fair Value Available-for-sale Securities, Current Debt Securities, Available-for-sale, Amortized Cost Debt Securities, Available-for-sale, Amortized Cost Available-for-sale Securities, Amortized Cost Basis Available-for-sale Securities, Amortized Cost Basis Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Stock-based Compensation Disclosure of Compensation Related Costs, Share-based Payments [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] Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] Total employee stock-based compensation Allocated Share-based Compensation Expense 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 Income Tax Disclosure [Abstract] Provision (benefit) for income taxes Effective tax rate Effective Income Tax Rate Reconciliation, Percent Unrecognized Tax Benefits Unrecognized Tax Benefits Unrecognized Tax Benefits that Would Impact Effective Tax Rate Unrecognized Tax Benefits that Would Impact Effective Tax Rate Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Accrued Liabilities [Member] Other Noncurrent Liabilities [Member] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Lease, Expense Lease, Expense Lease, Expense Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year Operating Lease, Weighted Average Remaining Lease Term Operating Lease, Weighted Average Remaining Lease Term Finance Lease, Weighted Average Remaining Lease Term Finance Lease, Weighted Average Remaining Lease Term Operating Lease, Weighted Average Discount Rate, Percent Operating Lease, Weighted Average Discount Rate, Percent Finance Lease, Weighted Average Discount Rate, Percent Finance Lease, Weighted Average Discount Rate, Percent Lease, Right-of-Use Asset Lease, Right-of-Use Asset Lease, Right-of-Use Asset Operating Lease, Liability, Current Finance Lease, Liability, Current Finance Lease, Liability, Current Finance Lease, Liability, Noncurrent Finance Lease, Liability, Noncurrent Lease, Liability Lease, Liability Lease, Liability Finance Lease, Liability, Payments, Remainder of Fiscal Year Finance Lease, Liability, Payments, Remainder of Fiscal Year Lessee, Operating Lease, Liability, Payments, Due Year Two Lessee, Operating Lease, Liability, Payments, Due Year Two Finance Lease, Liability, Payments, Due Year Two Finance Lease, Liability, Payments, Due Year Two Lessee, Operating Lease, Liability, Payments, Due Year Three Lessee, Operating Lease, Liability, Payments, Due Year Three Finance Lease, Liability, Payments, Due Year Three Finance Lease, Liability, Payments, Due Year Three Lessee, Operating Lease, Liability, Payments, Due Year Four Lessee, Operating Lease, Liability, Payments, Due Year Four Finance Lease, Liability, Payments, Due Year Four Finance Lease, Liability, Payments, Due Year Four Lessee, Operating Lease, Liability, Payments, Due Year Five Lessee, Operating Lease, Liability, Payments, Due Year Five Finance Lease, Liability, Payments, Due Year Five Finance Lease, Liability, Payments, Due Year Five Lessee, Operating Lease, Liability, Payments, Due after Year Five Lessee, Operating Lease, Liability, Payments, Due after Year Five Finance Lease, Liability, Payments, Due after Year Five Finance Lease, Liability, Payments, Due after Year Five Lessee, Operating Lease, Liability, Payments, Due Lessee, Operating Lease, Liability, Payments, Due Finance Lease, Liability, Payments, Due Finance Lease, Liability, Payments, Due Lessee, Operating Lease, Liability, Undiscounted Excess Amount Lessee, Operating Lease, Liability, Undiscounted Excess Amount Finance Lease, Liability, Undiscounted Excess Amount Finance Lease, Liability, Undiscounted Excess Amount Finance Lease, Liability Finance Lease, Liability Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Income Taxes Income Tax Disclosure [Text Block] Net Income Per Share Earnings Per Share [Text Block] Revenue, Initial Application Period Cumulative Effect Transition [Table] Revenue, Initial Application Period Cumulative Effect Transition [Table] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Subscription Revenue Subscription Revenue [Member] Subscription Revenue [Member] Revenue, Initial Application Period Cumulative Effect Transition [Line Items] Revenue, Initial Application Period Cumulative Effect Transition [Line Items] Capitalized Contract Cost, Amortization Period Capitalized Contract Cost, Amortization Period Amortization of commissions assets Amortization of Deferred Sales Commissions Revenue recognized Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-sale [Table] Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-sale [Line Items] 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 Available-for-sale Securities, Debt and Equity Maturities, Next Twelve Months, Fair Value 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 Available-for-sale Securities, Debt and Equity Maturities, Year One through Two, Fair Value 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 Available-for-sale Securities, Debt and Equity Maturities, After Year Two, Fair Value Revenue from Contracts with Customers Revenue from Contract with Customer [Text Block] Fair Value of Financial Instruments Fair Value Disclosures [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 Retained Earnings [Member] Statement [Line Items] Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance (in shares) Shares, Outstanding Retained Earnings (Accumulated Deficit) Cumulative Effect of New Accounting Principle in Period of Adoption Cumulative Effect of New Accounting Principle in Period of Adoption 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) Stock Repurchased During Period, Shares Stock Repurchased During Period, Shares Treasury Stock, Value, Acquired, Cost Method Stock Repurchased During Period, Value Adjustment To Additional Paid In Capital, Share-Based Compensation, Taxes Related To Net Share Settlements Of Equity Awards Adjustment To Additional Paid In Capital, Share-Based Compensation, Taxes Related To Net Share Settlements Of Equity Awards Adjustment To Additional Paid In Capital, Share-Based Compensation, Taxes Related To Net Share Settlements Of Equity Awards 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 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 Stock-based compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Balance (in shares) Revenue, Remaining Performance Obligation, Amount Revenue, Remaining Performance Obligation, Amount Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Developed Technology [Member] Developed Technology [Member] Developed Technology [Member] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] 1Mobility 1Mobility [Member] 1Mobility [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Total purchase price Business Combination, Consideration Transferred Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Estimated useful life of technology-based intangible assets Acquired Finite-lived Intangible Assets, Weighted Average Useful Life