Document and Entity Information Statement [Table] Statement [Line Items] Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag Current Fiscal Year End Date Entity Current Reporting Status Entity Filer Category Entity Small Business Entity Emerging Growth Company Entity Ex Transition Period Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Period Focus CONDENSED CONSOLIDATED BALANCE SHEETS Assets [Abstract] Assets Assets, Current [Abstract] Current assets: Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Restricted Cash and Cash Equivalents, Current Restricted cash Available-for-sale Securities, Debt Securities, Current Short-term investments Accounts Receivable, Net, Current Accounts receivable, net Inventory, Net Inventories Total inventories Prepaid Expense and Other Assets, Current Prepaid expenses and other current assets Assets, Current Total current assets Property, Plant and Equipment, Net Property and equipment, net Property and equipment, net Available-for-sale Securities, Debt Securities, Noncurrent Long-term investments Finite-Lived Intangible Assets, Net Intangible assets, net Intangible assets, net Goodwill Balance at end of the period Balance at beginning of the period Other Assets, Noncurrent Other assets Assets Total assets Liabilities and Equity [Abstract] Liabilities and stockholders' equity Liabilities, Current [Abstract] Current liabilities: Accounts Payable, Current Accounts payable Accrued Liabilities, Current Accrued liabilities Total accrued liabilities Contract with Customer, Liability, Current Current portion of deferred revenue Liabilities, Current Total current liabilities Other Liabilities, Noncurrent Other long-term liabilities Total other long-term liabilities Liabilities Total liabilities Commitments and Contingencies. Commitments and contingencies (Note 11) Stockholders' Equity Attributable to Parent [Abstract] Stockholders' equity: Common Stock, Value, Issued Common stock, $0.0001 par value; 500,000,000 shares authorized; 26,707,025 and 25,832,895 shares issued and outstanding at September 30, 2018 and December 31, 2017, respectively Additional Paid in Capital, Common Stock Additional paid-in capital Retained Earnings (Accumulated Deficit) Accumulated deficit Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive loss Stockholders' Equity Attributable to Parent Stockholders' equity Total stockholders' equity Liabilities and Equity Total liabilities and stockholders' equity Common Stock, Par or Stated Value Per Share Common stock, par value (in dollars 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 CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS Revenue from Contract with Customer, Excluding Assessed Tax Revenue Cost of Goods and Services Sold Cost of revenue Gross Profit Gross margin Operating Expenses [Abstract] Operating expenses: Research and Development Expense Research and development Selling and Marketing Expense Sales and marketing General and Administrative Expense General and administrative Operating Expenses Total operating expenses Operating Income (Loss) Income from operations Nonoperating Income (Expense) [Abstract] Other income (expense), net: Interest Income (Expense), Nonoperating, Net Interest, net Other Nonoperating Income (Expense) Other income (expense), net Nonoperating Income (Expense) Total other income (expense), net Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Income before income taxes Income Tax Expense (Benefit) Income tax expense (benefit) Net Income (Loss) Available to Common Stockholders, Basic Net income Net income Earnings Per Share [Abstract] Net income per common share: Earnings Per Share, Basic Basic (in dollars per share) Basic earnings per share (in dollars per share) Earnings Per Share, Diluted Diluted (in dollars per share) Diluted earnings per share (in dollars per share) Weighted Average Number of Shares Outstanding, Diluted [Abstract] Weighted-average number of shares: Denominator: Weighted Average Number of Shares Outstanding, Basic Basic (in shares) Weighted average common stock outstanding for basic net income per common share (in shares) Weighted Average Number of Shares Outstanding, Diluted Diluted (in shares) Weighted average common shares and dilutive securities outstanding (in shares) CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Other comprehensive income (loss): Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Foreign currency translation adjustment, net of tax Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent Net unrealized gain (losses) on available-for-sale investments, net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Total other comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive income CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Operating activities Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net income Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Depreciation Depreciation expense Amortization of Intangible Assets Amortization of intangible assets Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Loss (gain) on disposal of fixed assets Provision for Doubtful Accounts Provision Provision for doubtful accounts Amortization of Debt Discount (Premium) Investment discount and premium amortization Share-based Compensation Stock-based compensation Amount of realized tax benefit related to acquisition of business. Tax Benefit From Business Acquisition Tax benefit from business acquisition Increase (Decrease) in Operating Capital [Abstract] Changes in assets and liabilities: Increase (Decrease) in Accounts Receivable Accounts receivable, net Increase (Decrease) in Inventories Inventories Increase (Decrease) in Prepaid Expense and Other Assets Prepaid expenses and other current assets Increase (Decrease) in Other Operating Assets Other assets Increase (Decrease) in Accounts Payable Accounts payable Increase (Decrease) in Accrued Liabilities Accrued liabilities Increase Decrease In Contract With Customer Liability Deferred revenue Increase (Decrease) in Other Noncurrent Liabilities Other long-term liabilities Net Cash Provided by (Used in) Operating Activities Net cash provided by operating activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations [Abstract] Investing activities Payments to Acquire Available-for-sale Securities Purchases of available-for-sale investments Proceeds from Sale of Available-for-sale Securities Proceeds from sales of available-for-sale investments Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities Proceeds from maturities of available-for-sale investments Payments to Acquire Property, Plant, and Equipment Purchases of property and equipment Payments to Acquire Businesses, Net of Cash Acquired Business acquisitions, net of cash acquired Net Cash Provided by (Used in) Investing Activities Net cash used in investing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Financing activities Proceeds from Stock Options Exercised Proceeds from exercise of options for common stock Payments Related to Tax Withholding for Share-based Compensation Payments for withholding taxes related to net share settlement of equity awards Payments for Repurchase of Common Stock Repurchase of common stock Value of common stock repurchased Payments of Financing Costs Payment of debt issuance costs Net Cash Provided by (Used in) Financing Activities Net cash (used in) provided by financing activities Effect of Exchange Rate on Cash and Cash Equivalents, Continuing Operations Effect of exchange rate changes on cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Net change in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Unrestricted and restricted cash and cash equivalents at end of period Unrestricted and restricted cash and cash equivalents at beginning of period Supplemental Cash Flow Information [Abstract] Supplemental disclosure of cash flow information Interest Paid Cash paid for interest Income Taxes Paid Cash paid for taxes Noncash Investing and Financing Items [Abstract] Supplemental schedule of non-cash investing and financing activities Represents a portion of the purchase price that will be held for up to 18 months from the acquisition date to cover any of the sellers’ post-closing obligations, including without limitation any indemnification obligations that may arise. Business Acquisitions Holdback Amount Other Current Liabilities Business acquisitions holdback liability Capital Expenditures Incurred but Not yet Paid Purchases of property and equipment financed by accounts payable Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax Net unrealized gains (losses) on available-for-sale investments Description of Business and Summary of Significant Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Description of Business and Summary of Significant Accounting Policies Balance Sheet Components Supplemental Balance Sheet Disclosures [Text Block] Balance Sheet Components Financial Instruments Fair Value Measurements Text Block Financial Instruments Acquisitions Business Combination Disclosure [Text Block] Acquisitions Goodwill and Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Goodwill and Intangible Assets Long-Term Obligations Long-term Debt [Text Block] Long-Term Obligations Revenue Recognition Revenue from Contract with Customer [Text Block] Revenue Recognition Equity Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Equity Compensation Share Repurchases Treasury Stock [Text Block] Share Repurchases Income Taxes Income Tax Disclosure [Text Block] Income Taxes Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies Disclosure of accounting policy for unaudited interim financial statements. Unaudited Interim Financial Statements Policy Unaudited Interim Financial Statements Basis of Accounting, Policy [Policy Text Block] Basis of Presentation Segment Reporting, Policy [Policy Text Block] Segment Reporting Concentration Risk, Credit Risk, Policy [Policy Text Block] Concentrations of Risk Use of Estimates, Policy [Policy Text Block] Use of Accounting Estimates Standard Product Warranty, Policy [Policy Text Block] Limited Product Warranties Earnings Per Share, Policy [Policy Text Block] Net Income Per Share Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Restricted Cash New Accounting Pronouncements, Policy [Policy Text Block] Recent Accounting Pronouncements Schedule of Product Warranty Liability [Table Text Block] Schedule of changes in the product warranty liability Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Schedule of reconciliation of the numerator and denominator used in the calculation of basic and diluted net income per share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Schedule of anti-dilutive weighted-average common stock equivalents excluded from the calculation of diluted net income per share Schedule of Inventory, Current [Table Text Block] Schedule of inventories Property, Plant and Equipment [Table Text Block] Schedule of property and equipment, net Schedule of Accrued Liabilities [Table Text Block] Schedule of accrued liabilities Other Noncurrent Liabilities [Table Text Block] Schedule of other long-term liabilities Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis and all investments in certain debt and equity securities classified as available-for-sale. Schedule of Fair Value Assets and Liabilities Measured on Recurring Basis and Available for Sale Securities [Table Text Block] Schedule of cash and available-for-sale investments' adjusted cost, gross unrealized gains, gross unrealized losses and fair value by significant investment category recorded as cash and cash equivalents or short- or long-term investments Derivative Instruments, Gain (Loss) [Table Text Block] Schedule of pre-tax income (losses) not designated as hedging instruments Schedule of Goodwill [Table Text Block] Schedule of changes in carrying amount of goodwill Schedule of Acquired Finite-Lived Intangible Assets by Major Class [Table Text Block] Schedule of company's intangible assets and related accumulated amortization Finite-lived Intangible Assets Amortization Expense [Table Text Block] Schedule of amortization expense during the respective periods Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Schedule of amortization of finite lived intangible assets Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block] Schedule of adoption of ASC 606 impacted the Company’s previously reported results Disaggregation of Revenue [Table Text Block] Schedule of revenue from United States, Canada and all other international dealers and distributors combined Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Summary of changes in the allowance for doubtful accounts Contract with Customer, Asset and Liability [Table Text Block] Schedule of changes in deferred revenue Class of Warrant or Right [Table] Class of Warrant or Right [Line Items] Equity compensation Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Summary of stock option activity Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] Summary of stock options outstanding and exercisable Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Intrinsic Value [Table Text Block] Summary of aggregate intrinsic-value of options exercised, exercisable, and vested and expected to vest Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] Summary of restricted stock unit activity Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] Schedule of total stock-based compensation expense classified in Statements of Operations Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Schedule of future minimum rental payments required under non-cancelable operating leases Segment Reporting, Disclosure of Other Information about Entity's Reportable Segments [Abstract] Segment Reporting Number of Operating Segments Number of operating segments Number of dealers or distributors that accounted for more than the benchmark percentage of revenue during the period. Revenue Concentration Revenue concentration Concentration Risk, Percentage Concentration risk, percentage Product Warranty Liability [Table] Product Warranty Liability [Line Items] Standard Product Warranty Disclosure [Abstract] Product Warranty Represents the warranty period over which the entity is required to repair or replace defective products. Product Warranty Period Product warranty period Movement in Standard Product Warranty Accrual [Roll Forward] Changes in the product warranty liability Standard Product Warranty Accrual Balance at the end of the period Balance at the beginning of the period Standard Product Warranty Accrual, Warranties Issued Warranty costs accrued Standard Product Warranty Accrual, Payments Warranty claims Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Numerator: Weighted Average Number Diluted Shares Outstanding Adjustment Effect of dilutive securities—stock options and restricted stock units (in shares) Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities [Axis] Antidilutive Securities Name [Domain] Antidilutive Securities, Name [Domain] Stock Option [Member] Options Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Anti-dilutive weighted-average common stock equivalents excluded from the calculation of diluted net income per share Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Total (in shares) Property, Plant and Equipment [Table] Property, Plant and Equipment, Type [Axis] Property Plant And Equipment Type [Domain] Property, Plant and Equipment, Type [Domain] Represents information pertaining to the long-lived, depreciable assets that are used in the creation, maintenance and utilization of information systems and purchased software applications. Computer Equipment And Software [Member] Computer equipment and software Represents information pertaining to the manufacturing tooling and test equipment. Manufacturing Tools And Test Equipment [Member] Manufacturing tooling and test equipment Represents information pertaining to the lab and warehouse equipment. Lab And Warehouse Equipment [Member] Lab and warehouse equipment Leasehold Improvements [Member] Leasehold improvements Furniture And Fixtures [Member] Furniture and fixtures Property, Plant and Equipment [Line Items] Balance sheet Inventory, Net, Items Net of Reserve Alternative [Abstract] Inventories Inventory, Finished Goods, Net of Reserves Finished goods Inventory, Parts and Components, Net of Reserves Component parts Inventory, Work in Process, Net of Reserves Work-in-process Property, Plant and Equipment, Net [Abstract] Property and equipment, net Property, Plant and Equipment, Gross Property and equipment, gross Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Less: accumulated depreciation Accrued Liabilities, Current [Abstract] Accrued liabilities Carrying value, as of the balance sheet date, of obligations incurred through that date and payable for goods returned by customers and estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle, if longer). Sales Returns and Warranty Accrual Current Sales returns and current portion of warranty liability Employee-related Liabilities, Current Compensation accruals Other Accrued Liabilities, Current Other accrued liabilities Contract with customer liability, noncurrent Deferred revenue Standard Product Warranty Accrual, Noncurrent Warranty Other Sundry Liabilities, Noncurrent Other Fair Value, by Balance Sheet Grouping [Table] Measurement Frequency [Axis] Fair Value Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value Measurements Recurring [Member] Measured on a recurring basis Fair Value, Hierarchy [Axis] Fair Value Measurements Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Fair Value Inputs Level1 [Member] Level 1 Fair Value Inputs Level2 [Member] Level 2 Investment Type [Axis] Investment Type Categorization [Member] Investments [Domain] Money Market Funds [Member] Money market funds Availableforsale Securities [Member] Available-for-sale investments Corporate Debt Securities [Member] Corporate bonds Commercial Paper [Member] Commercial paper Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Primary financial statement caption encompassing cash and cash equivalents. Cash And Cash Equivalents Balance Sheet Location [Member] Cash and Cash Equivalents Primary financial statement caption encompassing short-term investments. Short Term Investments Balance Sheet Location [Member] Short-term investments Primary financial statement caption encompassing long-term investments. Long Term Investments Balance Sheet Location [Member] Long-term investments Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value Measurements Cash and Cash Equivalents, Fair Value Disclosure Fair value, cash and cash equivalents Available-for-sale Securities, Amortized Cost Basis Adjusted Cost, available-for-sale securities Represents the adjusted cost of cash and cash equivalents and investments. Cash And Cash Equivalents And Investments Adjusted Cost Adjusted Cost, assets Available for Sale Securities Accumulated Gross Unrealized Gain before Tax Unrealized Gains, available-for-sale securities Available for Sale Securities Accumulated Gross Unrealized Loss before Tax Unrealized Losses, available-for-sale securities Available-for-sale Securities Fair Value, available-for-sale investments Assets, Fair Value Disclosure Fair Value, assets Range [Axis] Range [Member] Range [Domain] Minimum [Member] Minimum Maximum [Member] Maximum Represents the maturity period of long-term investments. Maturity Period of Long Term Investments Maturity period of long-term investments Derivative Asset Assets related to derivative instruments Derivative Liability Liabilities related to derivative instruments Derivative, Gain (Loss) on Derivative, Net Foreign exchange forward contracts Schedule of Business Acquisitions, by Acquisition [Table] Business Acquisition [Line Items] Payments to Acquire Businesses, Gross Purchase price to acquire common stock Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents Cash acquired in acquisition Represents a portion of the purchase price that will be held for up to 18 months from the acquisition date to cover any of the sellers’ post-closing obligations, including without limitation any indemnification obligations that may arise. Business Acquisitions Holdback Amount Other Noncurrent Liabilities Business acquisitions holdback liability Represents the period from the acquisition date during which time a portion of the purchase price is held. Purchase Agreement Portion Held Period From Acquisition Date Purchase agreement, portion of purchase price held, period from acquisition date (in months) Schedule of Goodwill [Table] Goodwill [Line Items] Business Combination, Goodwill [Abstract] Business Combination - Goodwill Goodwill, Purchase Accounting Adjustments Measurement period adjustments Goodwill, Translation Adjustments Foreign currency translation adjustment Schedule of Finite-Lived Intangible Assets [Table] Finite-Lived Intangible Assets [Line Items] Intangible assets Finite-Lived Intangible Assets, Net [Abstract] Intangible assets Finite-Lived Intangible Assets, Gross Gross Carrying Amount Finite-Lived Intangible Assets, Accumulated Amortization Accumulated Amortization Finite-Lived Intangible Asset, Useful Life Weighted average amortization period Amortization of Deferred Charges [Abstract] Amortization expense Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Amortization of finite-lived intangible assets Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year Remainder of 2018 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2019 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2020 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Five 2022 Finite-Lived Intangible Assets, Amortization Expense, after Year Five Thereafter Schedule of Long-term Debt Instruments [Table] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] Prime Rate [Member] Prime Rate Debt Instrument [Line Items] Long-Term Obligations Line of Credit Facility, Maximum Borrowing Capacity Maximum borrowing capacity Debt Instrument, Basis Spread on Variable Rate Basis spread on variable rate (as a percent) Line of Credit Facility, Fair Value of Amount Outstanding Outstanding borrowings Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Commitment fee for quarterly unused capacity (as a percent) The minimum amount of cash advances required to be utilized in order to avoid assessment of the unused 2016 revolving line facility fee. Revolving Credit Facility Unused Revolving Line Facility Fee Threshold Unused line of credit fee threshold Revenue, Initial Application Period Cumulative Effect Transition [Table] Revenue, Initial Application Period Cumulative Effect Transition [Line Items] Disaggregation of Revenue [Table] Disaggregation of Revenue [Line Items] Represents the international revenue except Canada as a percentage of total revenue. Percentage of International Revenue Except Canada To Total Revenue International revenue (excluding Canada) as a percent of total revenue Allowance for Doubtful Accounts Receivable [Roll Forward] Allowance for Doubtful Accounts Receivable Balance at the end of the period Balance at the beginning of the period Allowance for Doubtful Accounts Receivable, Write-offs Write-offs The term for general requirement of payment in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Payment Term General Requirement For Payment Payment term, general requirement for payment Contract with Customer, Liability Balance at the end of the period Balance at the beginning of the period The additional amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. Contract with Customer Liability Additions Deferred revenue Contract with Customer, Liability, Revenue Recognized Recognition of deferred revenue Revenue, Remaining Performance Obligation Contracted not recognized revenue Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Expected timing of satisfaction Revenue, Remaining Performance Obligation, Percentage Percentage expected to be recognized Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Represents information pertaining to the 2013 Stock Option and Incentive Plan. Stock Option And Incentive2013 Plan [Member] 2013 Plan Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Stock options Represents the potential annual increase in shares authorized for issuance as a percentage of shares outstanding as of the preceding December 31, under the equity-based compensation plan. Share Based Compensation Arrangement by Share Based Payment Award, Increase in Number of Shares Authorized as Percentage of Shares Outstanding Potential annual increase in shares authorized for issuance as a percentage of shares outstanding as of the preceding December 31 Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized Increase in number of shares authorized for issuance Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Shares Subject to Options Outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Balance at the end of the period (in shares) Balance at the beginning of the period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period Expired (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Forfeited (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Exercisable options (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Vested and expected to vest at the end of the period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Balance at the end of the period (in dollars per share) Balance at the beginning of the period (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price Expired (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Exercisable options at the end of the period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Vested and expected to vest (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Weighted-Average Remaining Contractual Life Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Exercisable options Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term Vested and expected to vest Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table] 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] Represents information pertaining to the first exercise price range. Exercise Price Range One [Member] 4.89-7.49 Represents information pertaining to the second exercise price range. Exercise Price Range Two [Member] 8.16-12.93 Represents information pertaining to the third exercise price range. Exercise Price Range Three [Member] 12.98-19.56 Represents information pertaining to the fourth exercise price range. Exercise Price Range Four [Member] 20.91-22.92 Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] Equity compensation Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit Range of Exercise Price, low end of range (in dollars per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit Range of Exercise Price, high end of range (in dollars per share) Share Based Compensation Shares Authorized under Stock Option Plans Exercise Price Range Outstanding Options [Abstract] Options Outstanding Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price Weighted Average Exercise Price (in dollars per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options Number of Underlying Shares Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term Weighted-Average Remaining Contractual Life Share Based Compensation Shares Authorized under Stock Option Plans Exercise Price Range Exercisable Options [Abstract] Options Exercisable Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options Number of Underlying Shares Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Remaining Contractual Term Weighted-Average Remaining Contractual Life Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value Total fair value for the awards vested during the period Share Based Compensation Arrangement by Share Based Payment Award, Aggregate Intrinsic Value [Abstract] Intrinsic-value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Options Exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Options Exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value Options Vested and Expected to Vest Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Restricted stock units Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Non-vested balance at end of period (in shares) Non-vested balance at beginning of period (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Awarded Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Forfeited Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Non-vested balance at end of period (in dollars per share) Non-vested balance at beginning of period (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Awarded (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Vested (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Forfeited (in dollars per share) Shares Paid for Tax Withholding for Share Based Compensation Shares withheld for tax purposes (in shares) Restricted Stock, Shares Issued Net of Shares for Tax Withholdings Issuance of shares net of shares withheld (in shares) Defined Contribution Plan Disclosure [Line Items] Defined Contribution Plan, Employer Matching Contribution, Percent of Match Employer matching contribution (as a percent) Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Employees' gross pay for which the employer contributes a matching contribution (as a percent) Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent Maximum amount of employees' gross pay the employee may contribute (as a percent) Stock Issued During Period, Shares, Employee Benefit Plan Shares contributed (in shares) Defined Contribution Plan, Cost Recognized Expenses associated with contribution Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Cost Of Sales [Member] Cost of revenue Research And Development Expense [Member] Research and development Selling And Marketing Expense [Member] Sales and marketing General And Administrative Expense [Member] General and administrative Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Total stock-based compensation expense Allocated Share-based Compensation Expense Total stock-based compensation expense Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options Total unrecognized compensation cost related to non-vested stock option awards Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options Total unrecognized compensation cost related to non-vested restricted stock units Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Weighted-average period over which unrecognized compensation cost will be recognized Class of Treasury Stock [Table] Equity, Class of Treasury Stock [Line Items] Stock Repurchase Program, Authorized Amount Common stock authorized for repurchase Stock Repurchased During Period, Shares Number of common stock repurchased (in shares) Table for income taxes. Income Taxes [Table] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Income Taxes [Line Items] Effective Income Tax Rate Reconciliation, Percent Effective income tax rate (as a percent) Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent U.S. federal statutory rate (as a percent) Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to increase (decrease) from transition tax pursuant to Tax Cuts and Jobs Act of 2017. Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of 2017 Transition Tax Amount One-time transition tax Amount of increase (decrease) in the valuation allowance from change in tax rate pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete. Tax Cuts And Jobs Act Of 2017 Incomplete Accounting Change In Tax Rate Valuation Allowance Increase Decrease Valuation allowance decrease Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to the total of all provisions of the Tax Cuts and Jobs Act of 2017. Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of 2017 Total Impact Amount Net tax expense or benefit Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operations, attributable to increase (decrease) from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act of 2017. Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of 2017 Transition Tax On Accumulated Foreign Earnings Amount Transition tax, unrepatriated foreign earnings Amount of reported income tax expense (benefit) attributable to the repeal of the Alternative Minimum Tax by the Tax Cuts and Jobs Act of 2017. Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of 2017 Alternative Minimum Tax Credit Amount AMT credit carryforwards, one-time tax benefit Amount of increase (decrease) in the valuation allowance attributable to the repeal of the Alternative Minimum Tax by the Tax Cuts and Jobs Act of 2017. Tax Cuts And Jobs Act Of 2017 Alternative Minimum Tax Credit Valuation Allowance Increase Decrease AMT valuation allowance decrease Amount of reasonable estimate for income tax benefit for remeasurement of deferred tax liability from change in tax rate pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete. Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Deferred Tax Liability, Provisional Income Tax Benefit Tax benefit arising from Tax Act Amount of undistributed accumulated earnings of foreign subsidiary intended to be permanently reinvested outside country of domicile for which accounting for tax effect is incomplete pursuant to Tax Cuts and Jobs Act of 2017 and no reasonable estimate is determined. Tax Cuts And Jobs Act Of 2017 Incomplete Accounting Existing Undistributed Accumulated Earnings Of Foreign Subsidiary Unrepatriated foreign earnings, incomplete accounting for tax effect Operating Loss Carryforwards Net operating loss The amount of deferred tax expense recognized in the period arising from income tax examinations. Income Tax Examination Deferred Tax Expense Income tax examination, deferred tax expense The amount of deferred tax benefit recognized in the period arising from income tax examinations. Income Tax Examination Deferred Tax Benefit Income tax examination, deferred tax benefit Income Tax Examination, Increase (Decrease) in Liability from Prior Year Income tax examination, net tax impact Tax Credit Carryforward, Amount Tax credit carryforwards Schedule of Operating Leased Assets [Table] Operating Leased Assets [Line Items] Operating Leases Represents the term over which operating leases can be extended. Operating Leases Term of Extension Extension term of leases Operating Leases, Rent Expense, Net Rental expense Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] Future minimum rental payments Operating Leases, Future Minimum Payments, Remainder of Fiscal Year Remainder of 2018 Operating Leases, Future Minimum Payments, Due in Two Years 2019 Operating Leases, Future Minimum Payments, Due in Three Years 2020 Operating Leases, Future Minimum Payments, Due in Four Years 2021 Operating Leases, Future Minimum Payments, Due in Five Years 2022 Operating Leases, Future Minimum Payments, Due Thereafter Thereafter Operating Leases, Future Minimum Payments Due Total Purchase Obligation, Fiscal Year Maturity [Abstract] Purchase Commitments Purchase Obligation Non-cancellable purchase commitments Loss Contingency Accrual, Disclosures [Abstract] Indemnification Loss Contingency Accrual Accrued liability Loss Contingency, Pending Claims, Number Number of outstanding claims Scenario [Axis] Scenario Unspecified [Domain] Scenario, Unspecified [Domain] Alternate value in the provided range. Alternate [Member] Alternate Restricted Stock Units R S U [Member] Restricted stock units Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock [Member] Common Stock Other Capitalized Property Plant And Equipment [Member] Other Cash [Member] Cash U S Treasury Notes Securities [Member] U.S. government notes Derivative Instrument [Axis] Derivative Contract Type [Domain] Derivative Contract [Domain] Foreign Exchange Contract [Member] Foreign exchange contracts Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Nondesignated [Member] Not designated as hedging instrument Other Nonoperating Income Expense [Member] Other income (expense), net Business Acquisition [Axis] Business Acquisition Acquiree [Domain] Business Acquisition, Acquiree [Domain] Represents Triad Holdings, Inc. Triad Holdings Inc [Member] Triad Holdings, Inc. Finite-Lived Intangible Assets by Major Class [Axis] Finite Lived Intangible Assets Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Developed Technology Rights [Member] Developed technology Customer Relationships [Member] Customer relationships Trademarks And Trade Names [Member] Trademark/trade name Noncompete Agreements [Member] Non-competition agreements Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Credit Facility [Member] Revolving credit facility London Interbank Offered Rate L I B O R [Member] LIBOR Adjustments for New Accounting Pronouncements [Axis] Type Of Adoption [Member] Type of Adoption [Domain] Accounting Standards Update201409 [Member] Accounting Standards Update 2014-09 Initial Application Period Cumulative Effect Transition [Axis] Initial Application Period Cumulative Effect Transition [Domain] Initial Application Period Cumulative Effect Transition [Domain] Calculated Under Revenue Guidance In Effect Before Topic606 [Member] As previously reported Difference Between Revenue Guidance In Effect Before And After Topic606 [Member] ASC 606 adjustment Geographical [Axis] Segment Geographical [Domain] Geographical [Domain] U [S] United States C [A] Canada Represents all other international sources. Foreign Countries Except Canada [Member] All other international sources Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Award Type [Axis] Share Based Compensation Arrangements By Share Based Payment Award Award Type And Plan Name [Domain] Equity Award [Domain] Employee Stock Option [Member] Stock options Represents information related to the first portion of employees' salary related to a defined benefit plan. First Portion Of Employees Salary [Member] First 1% of employees' salary Represents information related to the second portion of employees' salary related to a defined benefit plan. Second Portion Of Employees Salary [Member] Second 5% of employees' salary Income Tax Authority, Name [Axis] Income Tax Authority Name [Domain] Income Tax Authority, Name [Domain] Internal Revenue Service I R S [Member] Federal Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] State And Local Jurisdiction [Member] State Represents the amount before measurement period adjustment. Scenario Before Measurement Period Adjustment [Member] Before measurement period adjustment Scenario Adjustment [Member] Measurement period adjustment Represents the amount after measurement period adjustment. After Measurement Period Adjustment [Member] After measurement period adjustment Represents the amount after adjustment from transition tax pursuant to Tax Cuts and Jobs Act of 2017. After Transition Tax From Tax Cuts And Jobs Act Of2017 [Member] Amount after transition tax pursuant to Tax Cuts and Jobs Act Loss Contingency Nature [Axis] Loss Contingency Nature [Domain] Loss Contingency, Nature [Domain] Indemnification Guarantee [Member] Indemnification agreements