Document and Entity Information Statement [Table] Statement Statement Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Filer Category Entity Public Float Entity Common Stock, Shares Outstanding Document Fiscal Year Focus Document Fiscal Period Focus CONSOLIDATED BALANCE SHEETS Assets [Abstract] Assets Assets, Current [Abstract] Current assets: Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents at end of period Cash and cash equivalents at beginning of period Cash and cash equivalents Restricted Cash and Cash Equivalents, Current Restricted cash Short-term Investments 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 Long-term Investments 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 Other assets total 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 Deferred Revenue, Current Deferred revenue Notes Payable, Current Current portion of notes payable Liabilities, Current Total current liabilities Notes Payable, Noncurrent Notes payable Other Liabilities, Noncurrent 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; 24,305,381 and 24,590,768 shares issued; 24,305,381 and 23,436,288 shares outstanding at December 31, 2014 and 2015, respectively Treasury Stock, Value Treasury stock, at cost; 0 and 1,154,480 shares at December 31, 2014 and 2015, 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 Balance Balance 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 Treasury Stock, Shares Treasury stock, shares CONSOLIDATED STATEMENTS OF OPERATIONS Revenues Revenue Total revenue Cost of Revenue. Cost of revenue Represents the aggregate gain or loss related to inventory purchase commitments incurred during the period. Cost of Revenue Inventory Purchase Commitment Cost of revenue - inventory purchase commitment Gain on inventory purchase commitment Gain on inventory purchase commitment 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 Litigation Settlement, Expense Litigation settlement Operating Expenses Total operating expenses Operating Income (Loss) Income (loss) from operations Nonoperating Income (Expense) [Abstract] Other income (expense): Interest Income (Expense), Net Interest, net Other Nonoperating Income (Expense) Other expense Nonoperating Income (Expense) Total other income (expense) Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Income (loss) before income taxes Income Tax Expense (Benefit) Income tax expense Total income tax expense Net Income (Loss) Available to Common Stockholders, Basic Net income (loss) Net income (loss) Earnings Per Share [Abstract] Net income (loss) per common share: Earnings Per Share, Basic Basic (in dollars per share) Earnings Per Share, Diluted Diluted (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 (loss) per common share (in shares) Weighted Average Number of Shares Outstanding, Diluted Diluted (in shares) Weighted average common shares and dilutive securities outstanding CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS 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 gains (losses) on available-for-sale investments, net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other comprehensive income (loss) Total other comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive income (loss) CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock [Member] Common Stock Additional Paid In Capital [Member] Additional Paid-In Capital Retained Earnings [Member] Accumulated Deficit Accumulated Other Comprehensive Income [Member] Accumulated Other Comprehensive (Loss) Income Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity Shares, Issued Balance (in shares) Balance (in shares) Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net Excess tax benefit from exercise of options for common stock Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Stock-based compensation Adjustment to additional paid in capital resulting from the issuance of common stock options in connection with a business acquisition. Adjustments To Additional Paid In Capital Stock Options Issued In Connection With Business Acquisition Issuance of common stock options in connection with a business acquisition Stock Issued During Period, Value, Conversion of Convertible Securities Conversion of redeemable convertible preferred stock into common stock Stock Issued During Period, Shares, Conversion of Convertible Securities Conversion of redeemable convertible preferred stock into common stock (in shares) Stock Issued During Period, Value, New Issues Issuance of common stock, net of issuance costs Stock Issued During Period, Shares, New Issues Issuance of common stock, net of issuance costs (in shares) Represents the amount of increase in additional paid in capital (APIC) resulting from the reclassification of redeemable convertible preferred stock warrant liability upon conversion to common stock warrant. Adjustments to Additional Paid in Capital Reclassification of Redeemable Convertible Preferred Stock Warrant Liability Reclassification of redeemable convertible preferred stock warrant liability upon conversion to common stock warrant Value of stock issued as a result of the exercise of warrants. Stock Issued During Period Stock Warrants Exercised Issuance of common stock upon net exercise of common stock warrants Represents the number of common stock warrants exercised during the current period. Stock Issued During Period Shares Stock Warrants Exercised Issuance of common stock upon net exercise of common stock warrants (in shares) Represents the amount of increase in additional paid in capital (APIC) resulting from the reclassification of redeemable convertible preferred stock warrant liability upon conversion to preferred stock. Adjustments to Additional Paid in Capital Reclassification of Redeemable Convertible Preferred Stock Warrant Liability Upon Conversion to Preferred Stock Reclassification of redeemable convertible preferred stock warrant liability upon conversion to preferred stock Stock Issued During Period, Value, Stock Options Exercised Issuance of common stock upon exercise of stock options Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Exercised (in shares) Issuance of common stock upon exercise of stock options (in shares) Stock Repurchased During Period, Value Repurchase of common stock for treasury Stock Repurchased During Period, Shares Repurchase of common stock for treasury (in shares) Temporary Equity, by Class of Stock [Table] Class of Stock [Axis] Class Of Stock [Domain] Class of Stock [Domain] Redeemable Convertible Preferred Stock [Member] Redeemable Convertible Preferred Stock Temporary Equity [Line Items] Statement Increase (Decrease) in Temporary Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity Temporary Equity, Carrying Amount, Attributable to Parent Balance Balance Temporary Equity, Shares Issued Balance (in shares) Balance (in shares) CONSOLIDATED STATEMENTS OF CASH FLOWS Net Cash Provided by (Used in) Operating Activities, Continuing Operations [Abstract] Operating activities Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income (loss) to net cash provided by operating activities: Depreciation Depreciation expense Amortization of Intangible Assets Amortization of intangible assets Provision for Doubtful Accounts Provision Provision for doubtful accounts Share-based Compensation Stock-based compensation Excess Tax Benefit from Share-based Compensation, Operating Activities Excess tax benefit from exercise of options for common stock Fair Value Adjustment of Warrants Warrant liability expense Increase (Decrease) in Operating Capital [Abstract] Changes in assets and liabilities: Increase (Decrease) in Accounts Receivable Accounts receivable Increase (Decrease) in Inventories Inventories Increase (Decrease) in Restricted Cash Restricted cash 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 Deferred Revenue Deferred revenue Increase (Decrease) in Other Noncurrent Liabilities Other long-term liabilities Net Cash Provided by (Used in) Operating Activities, Continuing Operations 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, Continuing Operations Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations [Abstract] Financing activities Proceeds from Issuance Initial Public Offering Proceeds from issuance of common stock, net of issuance costs Proceeds from Stock Options Exercised Proceeds from exercise of options for common stock Excess Tax Benefit from Share-based Compensation, Financing Activities Excess tax benefit from exercise of options for common stock Payments for Repurchase of Common Stock Repurchase of common stock Treasury Stock, Value Proceeds from Notes Payable Proceeds from notes payable Repayments of Notes Payable Repayment of notes payable Net Cash Provided by (Used in) Financing Activities, Continuing Operations Net cash provided by (used in) 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 decrease in cash and cash equivalents 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 the amount of options for common stock granted in connection with a business acquisition. Options for Common Stock Granted in Connection with Acquisition Options for common stock granted in connection with a business acquisition Amount of liability eliminated upon net exercise of warrants to purchase preferred stock. Elimination of Liability upon Net Exercise of Warrants to Purchase Preferred Stock Elimination of liability upon net exercise of warrants to purchase preferred stock Conversion of Stock, Amount Converted Conversion of redeemable convertible preferred stock to common stock Represents non-cash investing and financing activities of payments to tenant improvements by landlord. Noncash Or Part Noncash Landlord Paid Tenant Improvements Landlord paid tenant improvements Capital Expenditures Incurred but Not yet Paid Purchases of property and equipment financed by accounts payable Available-for-sale Securities, Gross Unrealized Gain (Loss) Net unrealized 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 Fair Value Measurements. Fair Value Measurements Acquisition Business Combination Disclosure [Text Block] Acquisition Goodwill and Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Goodwill and Intangible Assets Long-Term Obligations The entire disclosure for long-term obligations. Long Term Obligations Disclosure [Text Block] Long-Term Obligations Income Taxes Income Tax Disclosure [Text Block] Income Taxes Equity Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Equity Compensation Share Repurchases Treasury Stock [Text Block] Share Repurchases Related Party Transactions Related Party Transactions Disclosure [Text Block] Related Party Transactions Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies Subsequent Event Subsequent Events [Text Block] Subsequent Event 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 Disclosure of accounting policy for geographic information. Geographic Information [Policy Text Block] Geographic Information Use of Estimates, Policy [Policy Text Block] Use of Accounting Estimates Standard Product Warranty, Policy [Policy Text Block] Product Warranty