Property, Plant and Equipment [Abstract] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Internal-use software Software and Software Development Costs [Member] Developed internal-use software Software Development [Member] Purchased software for internal use Computer Software [Member] Computer Software [Member] Property, Plant and Equipment [Line Items] Amortization of capitalized internal use computer software Capitalized Computer Software, Amortization Capitalized Computer Software Capitalized Computer Software, Net [Abstract] Gross Cost Capitalized Computer Software, Gross Net of Accumulated Amortization Capitalized Computer Software, Net Capitalized Computer Software, Future Amortization Expense Capitalized Computer Software, Amortization Expense, Fiscal Year Maturity [Abstract] Capitalized Computer Software, Amortization Expense,, Fiscal Year Maturity [Abstract] 2014 Capitalized Computer Software, Amortization Expense, Next Twelve Months Capitalized Computer Software, Amortization Expense, Next Twelve Months 2015 Capitalized Computer Software, Amortization Expense, Year Two Capitalized Computer Software, Amortization Expense, Year Two 2016 Capitalized Computer Software, Amortization Expense, Year Three Capitalized Computer Software, Amortization Expense, Year Three Accounting Policies [Abstract] SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] Quarterly Financial Information Disclosure [Abstract] Net revenues Revenue, Net 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 Loss from operations Income (Loss) from Continuing Operations Attributable to Parent Other expense, net Nonoperating Income (Expense) Loss before income taxes Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest Provision for income taxes Income Tax Expense (Benefit) Net loss attributable to common stockholders Net Income (Loss) Attributable to Parent Net loss per share attributable to common stockholders, basic and diluted (usd per share) Income (Loss) from Continuing Operations, Per Basic and Diluted Share Organization, Consolidation and Presentation of Financial Statements [Abstract] DESCRIPTION OF BUSINESS Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis] Income Statement Location [Axis] Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Report Line [Domain] Income Statement Location [Domain] Cost of revenues Cost of Sales [Member] Research and development Research and Development Expense [Member] Sales and marketing Selling and Marketing Expense [Member] General and administrative General and Administrative Expense [Member] Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Allocation of Stock-based Compensation Expense Included in the Consolidated Statement of Operations [Abstract] Share-based Compensation, Allocation and Classification in Financial Statements [Abstract] Total stock-based compensation expense Allocated Share-based Compensation Expense Quarterly Financial Information Quarterly Financial Information [Text Block] Fair Value Disclosures [Abstract] Derivative [Table] Derivative [Table] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Not designated as hedging instrument Not Designated as Hedging Instrument [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Foreign exchange forward Foreign Exchange Forward [Member] Derivative [Line Items] Derivative [Line Items] Notional amount of foreign currency Derivative, Notional Amount Net loss on foreign currency Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments Debt Disclosure [Abstract] Schedule of long-term debt Schedule of Long-term Debt Instruments [Table Text Block] Schedule of maturities of long-term debt Schedule of Maturities of Long-term Debt [Table Text Block] FAIR VALUE OF FINANCIAL INSTRUMENTS Fair Value, Measurement Inputs, Disclosure [Text Block] STOCK-BASED COMPENSATION Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Inventory Disclosure [Abstract] Schedule of inventory Inventory, Net [Abstract] Raw materials Inventory, Raw Materials, Gross Finished goods Inventory, Finished Goods, Gross Total inventory Inventory, Net Inventory (Textual) [Abstract] Inventory (Textual) [Abstract] Inventory. Inventory write-downs Inventory Write-down Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Revolving Credit Facility Revolving Credit Facility [Member] Term loan Secured Debt [Member] Equipment financing facility Equipment Financing Facility [Member] Equipment financing facility. Lender Name [Axis] Lender Name [Axis] Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Wells Fargo Bank Wells Fargo Bank [Member] Wells Fargo Bank. Hercules Technology Growth Capital, Inc Hercules Technology Growth Capital Inc [Member] Hercules Technology Growth Capital, Inc. Horizon Technology Finance Corporation Horizon Technology Finance Corporation [Member] Horizon Technology Finance Corporation. Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] LIBOR or Base Rate London Interbank Offered Rate (LIBOR) or Base Rate [Member] London Interbank Offered Rate (LIBOR) or Base Rate [Member] Prime Rate Prime Rate [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Long-Term Debt (Textual) [Abstract] Long Term Debt (Textual) [Abstract] Long term debt. Convertible loan facility, maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Term Loan interest at an prime rate Debt Instrument, Basis Spread on Variable Rate Amount of liquidity required for debt compliance Amount of Liquidity Required for Debt Compliance Amount of Liquidity Required for Debt Compliance Amount of undrawn credit for debt compliance Amount of Undrawn Credit for Debt Compliance Amount of Undrawn Credit for Debt Compliance Amount of liquidity required for debt compliance Amount of Undrawn Credit for Debt Compliance, Amount Maturing in Year Three Amount of Undrawn Credit for Debt Compliance, Amount Maturing in Year Three Convertible loan facility, remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Debt instrument additional borrowing amount Proceeds from Issuance of Debt Repayment of term loans Repayments of Subordinated Debt Term Loan interest at an annual rate Line of Credit Facility, Interest Rate During Period Credit facility, end of term charge Line of Credit Facility, End of Term Fee Line of Credit Facility, End of Term Fee Long-term debt, gross Long-term Debt, Gross Income Tax Disclosure [Abstract] Income Taxes [Table] Income Taxes [Table] Income Taxes [Table] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] Internal Revenue Service (IRS) Internal Revenue Service (IRS) [Member] California CALIFORNIA Income Taxes [Line Items] Income Taxes [Line Items] [Line Items] for Income Taxes [Table] Provision for income taxes related to foreign operations Current Foreign Tax Expense (Benefit) Federal statutory income tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Operating loss carryforwards Operating Loss Carryforwards Net operating losses from excess stock option benefits Excess Tax Benefit from Share-based Compensation, Operating Activities Unrecognized tax benefits Unrecognized Tax Benefits Unrecognized tax benefits, increases in tax positions for the current year Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Unrecognized tax benefits, increases in tax positions for prior year Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions Unrecognized tax benefits, accrued interest and penalties Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense Schedule of valuation assumptions of stock options Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule of components of stock-based compensation expense in the consolidated statement of operations, by report line Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] Schedule of stock-based compensation expense by award type Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] Schedule of summary of stock option activity Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of stock options outstanding under the 2006 and 2011 Plans Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] Schedule of restricted stock unit activity Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] Schedule of summary of ESPP Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block] Statement of Financial Position [Abstract] Statement [Table] Statement [Table] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Statement [Line Items] Statement [Line Items] Allowances, accounts receivable Allowance for Doubtful Accounts Receivable Preferred stock, par value (usd per share) Preferred Stock, Par or Stated Value Per Share Preferred stock, shares authorized Preferred Stock, Shares Authorized Preferred stock, shares issued Preferred Stock, Shares Issued Preferred stock, shares outstanding Preferred Stock, Shares Outstanding Common stock, par value (usd per share) Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares issued Common Stock, Shares, Issued Common stock, shares outstanding Common Stock, Shares, Outstanding Product Warranties Disclosures [Abstract] Changes in the Company's product warranty liability Schedule of Product Warranty Liability [Table Text Block] Property, plant and equipment Property, Plant and Equipment [Table Text Block] Segment Reporting [Abstract] SEGMENT AND GEOGRAPHIC INFORMATION Segment Reporting Disclosure [Text Block] Equity [Abstract] STOCKHOLDERS' EQUITY Stockholders' Equity Note Disclosure [Text Block] Schedule of inventory Schedule of Inventory, Current [Table Text Block] Statement of Cash Flows [Abstract] Convertible debt Convertible Debt [Member] Debt, excluding convertible debt Debt, Excluding Convertible Debt [Member] Debt, Excluding Convertible Debt [Member] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Common Stock Common Stock [Member] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Net loss Adjustments to reconcile net loss to net cash used in operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Provision for doubtful accounts Provision for Doubtful Accounts Net loss on disposal of assets Gain (Loss) on Disposition of Other Assets Non-cash interest expense Amortization of Financing Costs and Discounts Stock-based compensation Share-based Compensation Change in fair value of convertible preferred stock warrants Unrealized Gain (Loss) on Derivatives Changes in operating assets and liabilities: Increase (Decrease) in Operating Assets [Abstract] Accounts receivable Increase (Decrease) in Accounts Receivable Inventory Increase (Decrease) in Inventories Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Accounts payable, accrued liabilities and warranty obligations Increase (Decrease) in Accounts Payable and Accrued Liabilities Deferred revenues Increase (Decrease) in Deferred Revenue Net cash used in 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 property and equipment Payments to Acquire Property, Plant, and Equipment Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Proceeds from issuance of convertible notes Proceeds from (Repayments of) Notes Payable Payments of costs related to issuance of convertible notes and financing costs Payments of Financing Costs Proceeds from private placement of common stock Proceeds from Issuance of Private Placement Principal payments under capital leases Repayments of Long-term Capital Lease Obligations Proceeds from borrowings under term loans Proceeds from Issuance of Long-term Debt Repayments of term loans Repayments of Long-term Debt Proceeds from issuance of common stock under employee stock plans Proceeds from Stock Plans Proceeds from issuance of common stock in IPO, net of underwriting discounts and commissions Proceeds from Issuance Initial Public Offering Payment of offering costs Payments of Stock Issuance Costs Net cash (used in) provided by financing activities Net Cash Provided by (Used in) Financing Activities Effect of exchange rate changes on cash Effect of Exchange Rate on Cash and Cash Equivalents Net (decrease) increase in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents — Beginning of period Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents — End of period Supplemental disclosures of cash flow information: Supplemental Cash Flow Information [Abstract] Cash paid for interest Interest Paid Cash paid for income taxes Income Taxes Paid Non-cash financing and investing activities: Noncash Investing and Financing Items [Abstract] Assets acquired under capital lease Capital Lease Obligations Incurred Purchases of property and equipment included in accounts payable Capital Expenditures Incurred but Not yet Paid Offering costs not yet paid Offering Costs not Yet Paid Offering costs not yet paid. Conversion of convertible notes into common stock upon IPO Stock Issued During Period, Value, Conversion of Convertible Securities Reclassification of convertible preferred stock warrant liability to additional paid-in capital upon IPO Reclassification of Preferred Stock Warrant Liability Reclassification of Preferred Stock Warrant Liability Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table] Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table] Exercise Price Range [Axis] Exercise Price Range [Axis] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain] $0.27 – $0.91 Range One [Member] Range One [Member] $1.63 - $1.63 Range Two [Member] Range Two [Member] $2.00 – $5.78 Range Three [Member] Range Three [Member] $5.87 - $7.50 Range Four [Member] Range Four [Member] $7.68 - $8.82 Range Five [Member] Range Five [Member] $9.40 - $11.00 Range Six [Member] Range Six [Member] Exercise Price Range of Options Outstanding and Options Exercisable [Line Items] Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] Range of Exercise Prices - Lower Range Limit (usd per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit Range of Exercise Prices - Upper Range Limit (usd per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit Number of Shares Outstanding Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options Weighted- Average Remaining Life of Outstanding Options (in years) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term Weighted- Average Exercise Price of Options Outstanding (usd per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Exercise Price Number of Shares Exercisable Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options Weighted- Average Exercise Price of Options Exercisable (usd per share) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Minimum Maximum Class of Stock [Line Items] Class of Stock [Line Items] Common stock shares issued during period, in connection with credit facility (shares) Stock Issued During Period, Shares, New Issues Common stock issued, price per share (usd per share) Share Price Net proceeds from IPO Underwriter's discounts and commissions Underwriters Discounts and Commissions Underwriters discounts and commissions. Other estimated offering costs Other Estimated Offering Costs Other estimated offering costs. Convertible preferred stock, shares outstanding Convertible preferred stock outstanding, value Preferred Stock, Value, Outstanding Convertible notes, outstanding balance of principal and accrued paid in kind interest Convertible Notes Payable Conversion of convertible preferred stock into common stock (shares) Conversion of Convertible Preferred Stock into Common Stock Conversion of convertible preferred stock into common stock. Conversion of notes into common stock (shares) Stock Issued During Period Shares Conversion of Convertible Securities and Paid in Kind Interest Stock issued during period shares conversion of convertible securities and paid in kind interest. Common stock conversion price per share (usd per share) Debt Instrument, Convertible, Conversion Price Debt interest expense Interest Expense, Debt Number of securities called by warrants Class of Warrant or Right, Number of Securities Called by Warrants or Rights Warrant to purchase common stock, price per share (usd per share) Class of Warrant or Right, Exercise Price of Warrants or Rights Accounting Policies [Table] Accounting Policies [Table] Accounting Policies [Table] Products and Services [Axis] Products and Services [Axis] Products and Services [Domain] Products and Services [Domain] First and Second Generation First and Second Generation [Member] First and Second Generation [Member] Third and Fourth Generation Third and Fourth Generation [Member] Third and Fourth Generation [Member] Enlighten Enlighten Web-based Monitoring Service [Member] Enlighten Web-based Monitoring Service [Member] Accounting Policies [Line Items] Accounting Policies [Line Items] [Line Items] for Accounting Policies [Table] Percent of revenue represented by product line or service Revenue, Net, Percentage Revenue, Net, Percentage Revenue recognition period Revenue Recognition, Recognition Period Revenue Recognition, Recognition Period Allowance for doubtful accounts Property and equipment estimated useful life Property, Plant and Equipment, Useful Life Product warranty, term Product Warranty, Term Product Warranty Term Product installation period Product Warranty, Estimated Failure Rate, Period Between Product Sale and Installation Product Warranty, Estimated Failure Rate, Period Between Product Sale and Installation Period failure rate measurement lags product sale Product Warranty, Estimated Failure Rate, Period Between Product Sale and Start of Monitoring Product Warranty, Estimated Failure Rate, Period Between Product Sale and Start of Monitoring Warranty obligation Product Warranty Accrual Research and development expense Stock-based compensation requisite service period Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period Schedule of Quarterly Financial Information Schedule of Quarterly Financial Information [Table Text Block] PROPERTY AND EQUIPMENT, NET Property, Plant and Equipment Disclosure [Text Block] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Recurring Fair Value, Measurements, Recurring [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Level 2 Fair Value, Inputs, Level 2 [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] Asset Derivatives Assets, Fair Value Disclosure [Abstract] Foreign currency forward contracts (Level 2) Foreign Currency Contract, Asset, Fair Value Disclosure Liability Derivatives Liabilities, Fair Value Disclosure [Abstract] Foreign currency forward contracts (Level 2) Foreign Currency Contracts, Liability, Fair Value Disclosure Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies [Table] Commitments and Contingencies [Table] Commitments and Contingencies [Table] Commitments and Contingencies [Line Items] Commitments and Contingencies [Line Items] [Line Items] for Commitments and Contingencies [Table] Rent expense Operating Leases, Rent Expense, Net Purchase obligation Purchase Obligation Purchase obligation time period Long Term Purchase Commitment, Time Period, Maximum Long Term Purchase Commitment, Time Period, Maximum Cancelable portion of purchase obligation Purchase Obligation, Cancelable Amount Purchase Obligation, Cancelable Amount Purchase obligation cancellation penalties Purchase Obligation, Cancellation Penalty, Maximum Purchase Obligation, Cancellation Penalty, Maximum Proceeds from common stock issued under ESPP Proceeds from Issuance of Common Stock, Employee Stock Purchase Plan Proceeds from Issuance of Common Stock, Employee Stock Purchase Plan Shares of common stock issued Stock Issued During Period, Shares, Employee Stock Purchase Plans Weighted-average price per share (usd per share) Employee Stock Purchase Plan, Weighted Average Purchase Price of Shares Purchased Employee Stock Purchase Plan, Weighted Average Purchase Price of Shares Purchased Principles of Consolidation Consolidation, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Risks and Uncertainties Risks and Uncertainties in Entity's Business, Policy [Policy Text Block] Risks and Uncertainties in Entity's Business, Policy [Policy Text Block] Revenue Recognition Revenue Recognition, Policy [Policy Text Block] Cost of Revenues Cost of Sales, Policy [Policy Text Block] Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Fair Value of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Derivatives Instruments Derivatives, Policy [Policy Text Block] Allowances for Doubtful Accounts Trade and Other Accounts Receivable, Policy [Policy Text Block] Inventory Inventory, Policy [Policy Text Block] Property and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Capitalized Software Costs Internal Use Software, Policy [Policy Text Block] Long-Lived Assets Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Warranty Obligations Standard Product Warranty, Policy [Policy Text Block] Research and Development Costs Research and Development Expense, Policy [Policy Text Block] Share-Based Compensation Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Comprehensive Loss Comprehensive Income, Policy [Policy Text Block] Income Taxes Income Tax, Policy [Policy Text Block] Statement of Stockholders' Equity [Abstract] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Convertible Preferred Stock Convertible Preferred Stock [Member] Common Stock Additional Paid-In Capital Additional Paid-in Capital [Member] Accumulated Deficit Retained Earnings [Member] Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income (Loss) [Member] 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 Private placement of common stock at $5.27 per share Stock Issued During Period, Value, Other Private placement of common stock at $5.27 per share (in shares) Stock Issued During Period, Shares, Other Exercise of stock options Adjustments to Additional Paid in Capital, Share-based Compensation and Exercise of Stock Options Exercise of stock options (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Stock-based compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Fair value of warrants and common stock issued in connection with convertible notes Adjustment to Additional Paid in Capital, Warrants and Common Stock Issued in Connection with Convertible Securities Adjustment to Additional Paid in Capital, Warrants and Common Stock Issued in Connection with Convertible Securities Fair value of beneficial conversion feature upon issuance of convertible notes Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature Fair value of beneficial conversion feature from accrued paid-in-kind interest of convertible notes Adjustments to Additional Paid in Capital, Other Accrued Paid-in-Kind Interest, Convertible Notes Adjustments to Additional Paid in Capital, Other Accrued Paid-in-Kind Interest, Convertible Notes Common stock issued upon initial public offering (“IPO”), net of offering costs Stock Issued During Period, Value, New Issues Common stock issued upon initial public offering (“IPO”), net of offering costs (in shares) Issuance of common stock under employee stock plans Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures Issuance of common stock under employee stock plans (in shares) Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Conversion of convertible preferred stock into common stock upon IPO Stock Issued During Period Value Conversion of Convertible Preferred Stock in to Common Stock Stock issued during period value conversion of convertible preferred stock in to common stock. Conversion of convertible preferred stock into common stock upon IPO (in shares) Stock Issued During Period Share Conversion of Convertible Preferred Stock into Common Stock Stock issued during period share conversion of convertible preferred stock into common stock. Conversion of convertible notes and paid-in-kind interest into common stock upon IPO Debt Conversion, Converted Instrument, Amount Conversion of convertible notes and paid-in-kind interest into common stock upon IPO (in shares) Debt Conversion, Converted Instrument, Shares Issued Reclassification of preferred stock warrant liability to APIC upon IPO Adjustments to Additional Paid in Capital, Reclassification of Preferred Stock Warrant Liability to Additional Paid in Capital Upon IPO Adjustment to Additional Paid in Capital, Reclassification of Preferred Stock Warrant Liability to Additional Paid in Capital Upon IPO Issuance of common stock upon exercise of warrants Issuance of common stock upon exercise of warrants (in shares) Stock Issued During Period, Shares, Conversion of Convertible Securities Foreign currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax BALANCE BALANCE (in shares) 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] 2006 Plan Two Thousand Six Plan [Member] Two thousand six plan. 2011 Plan Two Thousand and Eleven Plan [Member] Two thousand and eleven plan. 2011 Employee Stock Purchase Plan (ESPP) Employee Stock Purchase Plan (ESPP) [Member] Employee Stock Purchase Plan (ESPP) Award Date [Axis] Award Date [Axis] Award Date [Domain] Award Date [Domain] Before August 2012 Before August [Member] Before August. After August 2012 After August [Member] After August. Award Type [Axis] Award Type [Axis] Award Type [Domain] Equity Award [Domain] Restricted stock units Restricted Stock Units (RSUs) [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent event Subsequent Event [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Equity awards granted period vest over Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Equity awards granted contractual term Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Common stock, shares outstanding (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Number of shares outstanding, granted (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Issue of common stock (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Expiration term of ESPP Share Based Compensation Arrangement by Share Based Payment Award Expiration in Years Share based compensation arrangement by share based payment award expiration in years. Increase in number of shares of common stock reserved for issuance under the stock incentive plan Increase in Common Stock Shares Reserved for Future Issuance Percentage Increase in common stock shares reserved for future issuance percentage. Maximum number of shares that be issued pursuant to the exercise of incentive stock options Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Increase in shares authorized for issuance under plan Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized Yearly, share increase in reserved shares Share Based Compensation Arrangement by Share Based Payment Award Evergreen Shares Share based compensation arrangement by share based payment award evergreen shares. Number of interim purchase periods Employee Stock Purchase Plan, Number of Interim Purchase Periods Employee Stock Purchase Plan, Number of Interim Purchase Periods General duration (in months) of employee stock purchase plan General Duration of Employee Stock Purchase Plan General duration of employee stock purchase plan. Payroll deductions Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate Fair market value Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent Look-back feature in ESPP Share Based Compensation Arrangement by Share Based Payment Award Look Back Feature Period Share based compensation arrangement by share based payment award look back feature period. Recognition period for additional expense triggered by the reset feature Employee Stock Purchase Plan, Additional Expense Trigged by Reset Feature, Period for Recognition Employee Stock Purchase Plan, Additional Expense Trigged by Reset Feature, Period for Recognition Purchase of common stock IRS Limitation for Employees Right to Acquire Class Common Stock Under ESPP IRS Limitation for an employee's right to acquire class common stock under ESPP. Total unrecognized compensation cost Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Weighted-average period Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Intrinsic value of options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Number of options outstanding that were vested and expected to vest Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number Weighted-average fair value, vested (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price Weighted-average remaining contractual term, vested Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term Aggregate intrinsic value, exercisable shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Number of shares exercisable Common stock fair value (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Basis for Determining Aggregate Intrinsic Value, Company's Share Price, Per Share Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Basis for Determining Aggregate Intrinsic Value, Company's Share Price, Per Share Intrinsic value of units vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested Weighted average remaining contractual term Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms Intrinsic value of restricted stock units outstanding Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Intrinsic Value, Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Intrinsic Value, Value Stock options and restricted stock units Employee Stock Options and Restricted Stock Units [Member] Employee Stock Options and Restricted Stock Units [Member] ESPP Employee Stock [Member] Total stock-based compensation expense Earnings Per Share [Abstract] NET LOSS PER SHARE ATTRIBUTABLE TO COMMON STOCKHOLDERS Earnings Per Share [Text Block] LONG-TERM DEBT Long-term Debt [Text Block] Stock options Employee Stock Option [Member] The Fair Value of Each Option Granted During the Period [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Expected term (in years) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Expected volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Annual risk-free rate of return Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Weighted-average fair value on grant date (usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value INCOME TAXES Income Tax Disclosure [Text Block] Effective Income Tax Rate Reconciliation, Percent [Abstract] Income tax benefit at statutory rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount State taxes, net of federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Change in valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Stock-based compensation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Amount Other Income Tax Reconciliation, Nondeductible and Nontaxable Expense Other Income Tax Reconciliation Nondeductible and Nontaxable Expense Other Uncertain tax positions Effective Income Tax Rate Reconciliation, Tax Contingency, Foreign, Amount Provision for income taxes Schedule of Revenues from External Customers and Long-Lived Assets [Table] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Geographical [Axis] Geographical [Axis] Segment, Geographical [Domain] Geographical [Domain] United States UNITED STATES China CHINA Other Other Country [Member] Other country. Revenues from External Customers and Long-Lived Assets [Line Items] Revenues from External Customers and Long-Lived Assets [Line Items] Long-lived assets by geographic region Long Lived Assets [Abstract] Long lived assets. Total Long-Lived Assets Related Party Transactions [Abstract] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] KPCB Holdings, Inc. KPCB Holdings, Inc. [Member] KPCB Holdings, Inc. [Member] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Percentage of Company owned by related party Related Party, Ownership Percentage Of Company Related Party, Ownership Percentage Of Company Revenue from related parties Revenue from Related Parties WARRANTY OBLIGATIONS Product Warranty Disclosure [Text Block] Schedule of financial instruments that are measured at fair value on a recurring basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Schedule of potential common shares outstanding that were excluded from the computation of diluted net loss per share attributable to common stockholders Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] CONCENTRATION OF CREDIT RISK AND MAJOR CUSTOMERS Concentration Risk Disclosure [Text Block] Schedule of Revenue by Major Customers, by Reporting Segments [Table] Schedule of Revenue by Major Customers, by Reporting Segments [Table] Major Customers [Axis] Customer [Axis] Name of Major Customer [Domain] Customer [Domain] Customer Providing Largest Concentration of Receivable Customer With Highest Balance Due [Member] Customer With Highest Balance Due [Member] Customer Providing Second Largest Concentration of Receivable Customer With Second Highest Balance Due [Member] Customer With Second Highest Balance Due [Member] Customer Accounting for the Largest Concentration of Revenue Largest Customer Accounting for Most Revenue [Member] Largest Customer Accounting for Most Revenue [Member] Customer Accounting for Second Largest Concentration of Revenue Second Largest Customer Accounting for Most Revenue [Member] Second Largest Customer Accounting for Most Revenue [Member] Customer Accounting for Third Largest Concentraion Third Largest Customer Accounting for Most Revenue [Member] Third Largest Customer Accounting for Most Revenue [Member] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Accounts Receivable Accounts Receivable [Member] Net Revenue Net Revenue [Member] Net Revenue [Member] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Credit Concentration Risk Credit Concentration Risk [Member] Customer Concentration Risk Customer Concentration Risk [Member] Revenue, Major Customer [Line Items] Revenue, Major Customer [Line Items] Number of customers considered to give rise to concentration risk Number of Customers Considered to Give Rise to Concentration Risk Number of Customers Considered to Give Rise to Concentration Risk Percentage of concentration risk Concentration Risk, Percentage RELATED PARTY TRANSACTIONS Related Party Transactions Disclosure [Text Block] Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Options outstanding, beginning (shares) Granted (shares) Exercised (shares) Canceled (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period Options outstanding, ending (shares) Weighted- Average Exercise Price per Share Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Options outstanding, beginning (usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Granted (usd per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Exercised (usd per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Canceled (usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Options outstanding, ending (usd per share) INVENTORY Inventory Disclosure [Text Block] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Convertible preferred stock Stock options to purchase common stock Convertible notes Convertible Debt Securities [Member] Unvested restricted stock units Warrants to purchase common stock Warrant [Member] Convertible preferred stock warrants Warrant Convertible Common Stock [Member] Warrant convertible common stock. Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] The potential common shares outstanding that were excluded from the computation of diluted net loss per share attributable to common stockholders Antidilutive Securities [Abstract] Antidilutive securities. Total Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Components of Deferred Tax Assets and Liabilities [Abstract] Current: Deferred Tax Assets, Net of Valuation Allowance, Current Classification [Abstract] Reserves and allowances Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Current Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Current Valuation allowance Deferred Tax Assets, Valuation Allowance, Current Total current Deferred Tax Assets, Net of Valuation Allowance, Current Non-current: Deferred Tax Assets, Net of Valuation Allowance, Noncurrent Classification [Abstract] Net operating losses Deferred Tax Assets, Operating Loss Carryforwards, Noncurrent Deferred Tax Assets, Operating Loss Carryforwards, Noncurrent Stock-based compensation Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost, Noncurrent Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost, Noncurrent Deferred revenue Deferred Tax Assets, Deferred Income, Noncurrent Deferred Tax Assets, Deferred Income, Noncurrent Fixed assets and intangibles Deferred Tax Liabilities, Property, Plant and Equipment and Intangible Assets, Noncurrent Deferred Tax Liabilities, Property, Plant and Equipment and Intangible Assets, noncurrent Other Deferred Tax Assets, Deferred Expense Other, Noncurrent Deferred Tax Assets Tax Deferred Expense Other Current Valuation allowance Deferred Tax Assets, Valuation Allowance, Noncurrent Total non-current Deferred Tax Assets, Net of Valuation Allowance, Noncurrent Deferred tax liability Deferred Tax Liabilities, Gross Net deferred tax assets Deferred Tax Assets, Net 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] Term loans Equipment financing facility, net of unamortized discount of $31 and $94, respectively Schedule of long-term debt Long-term Debt, Current and Noncurrent [Abstract] Total debt Long-term Debt Less current portion Long-term Debt, Current Maturities Long-term portion Long-term Debt, Excluding Current Maturities Net of unamortized discount Debt Instrument, Unamortized Discount Schedule of changes in allowance for doubtful accounts Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Income Statement [Abstract] Other income (expense), net: Other Nonoperating Income (Expense) [Abstract] Interest expense Interest Expense Other income (expense) Other Nonoperating Income (Expense) Total other expense, net Shares used in computing net loss per share attributable to common stockholders, basic and diluted Weighted Average Number of Shares Outstanding, Basic and Diluted Schedule of future minimum rental payments for operating leases Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] 2014 Long-term Debt, Gross, Maturities, Repayments of Principal in Next Twelve Months Long-term Debt, Gross, Maturities, Repayments of Principal in Next Twelve Months 2015 Long-term Debt, Gross, Maturities, Repayments of Principal in Year Two Long-term Debt, Gross, Maturities, Repayments of Principal in Year Two 2016 Long-term Debt, Gross, Maturities, Repayments of Principal in Year Three Long-term Debt, Gross, Maturities, Repayments of Principal in Year Three Total United States International International [Member] International [Member] Revenues Net revenues and long-lived assets by geographic region Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] Changes in the Company's product warranty liability Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward] Balance, at beginning of year Accruals for warranties issued during the year Extended Product Warranty Accrual, Warranties Issued Changes in estimates Product Warranty Accrual, Preexisting, Increase (Decrease) Settlements Standard Product Warranty Accrual, Payments Balance, at end of year Less current portion included in accrued liabilities Product Warranty Accrual, Current Long-term portion Product Warranty Accrual, Noncurrent Allowance for Doubtful Accounts Receivable [Roll Forward] Allowance for Doubtful Accounts Receivable [Roll Forward] Balance, at beginning of year Charged to expenses Charged to Other Accounts Allowance for Doubtful Accounts, Charged to Other Accounts Allowance for Doubtful Accounts, Charged to Other Accounts Balance, at end of year Restricted Stock Units Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Outstanding units, beginning (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Canceled (shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Outstanding units, ending (shares) Weighted Average Fair Value per Share at Grant Date Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Outstanding units, beginning (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 (usd 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 Vested (usd 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 Canceled (usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Outstanding units, ending (usd per share) Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] 2014 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2015 Operating Leases, Future Minimum Payments, Due in Two Years 2016 Operating Leases, Future Minimum Payments, Due in Three Years 2017 Operating Leases, Future Minimum Payments, Due in Four Years 2018 Operating Leases, Future Minimum Payments, Due in Five Years Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total minimum lease payments Operating Leases, Future Minimum Payments Due ASSETS Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Accounts receivable, net of allowances of $2,000 and $1,177 Accounts Receivable, Net, Current Inventory Prepaid expenses and other Prepaid Expense and Other Assets, Current Total current assets Assets, Current Property and equipment, net Property, Plant and Equipment, Net Other 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 Deferred Revenue, Current Current portion of term loans Loans Payable, Current Total current liabilities Liabilities, Current Long-term liabilities: Liabilities, Noncurrent [Abstract] Deferred revenues Deferred Revenue, Noncurrent Warranty obligations Other liabilities Other Liabilities, Noncurrent Term loans Loans Payable, Noncurrent Total long-term liabilities Liabilities, Noncurrent Total liabilities Liabilities Commitments and contingencies Commitments and Contingencies Stockholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Preferred stock, $0.00001 par value, 10,000 shares authorized; none issued and outstanding Preferred Stock, Value, Issued Common stock, $0.00001 par value, 100,000 shares authorized; 42,123 and 40,856 shares issued and outstanding at December 31, 2013 and 2012, respectively Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Accumulated deficit Retained Earnings (Accumulated Deficit) Accumulated other comprehensive income Accumulated Other Comprehensive Income (Loss), Net of Tax Total stockholders’ equity Total liabilities and stockholders’ equity Liabilities and Equity Statement of Comprehensive Income [Abstract] Net loss attributable to common stockholders Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Foreign currency translation adjustments Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax Comprehensive loss attributable to common stockholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Equipment and machinery Machinery and Equipment [Member] Furniture and fixtures Furniture and Fixtures [Member] Computer equipment Computer Equipment [Member] Capitalized software Leasehold improvements Leasehold Improvements [Member] Construction in progress Construction in Progress [Member] Property, Plant and Equipment [Line Items] Estimated useful life Property and equipment, gross Property, Plant and Equipment, Gross Less accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Property and equipment, net Depreciation and amortization Depreciation COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Product Liability Contingency [Table] Product Liability Contingency [Table] Second Generation Second Generation Products [Member] Second Generation Products [Member] Third Generation Third Generation Product s [Member] Third Generation Products [Member] Fourth Generation Fourth Generation [Member] Fourth Generation [Member] Second and Third Generation Second and Third Generation [Member] Second and Third Generation [Member] Warranty Variable [Axis] Warranty Variable [Axis] Warranty Variable [Axis] Warranty Variable [Domain] Warranty Variable [Domain] [Domain] for Warranty Variable [Axis] Failure rate Failure Rate [Member] Failure Rates [Member] Replacement cost Replacement Cost [Member] Replacement Cost [Member] Claim rate Claim Rate [Member] Claim Rate [Member] Shipping cost Shipping Cost [Member] Shipping Cost [Member] Product Liability Contingency [Line Items] Product Liability Contingency [Line Items] Number of units sold Number of Units Sold Number of Units Sold Increase (decrease) in warranty expense due to changes in warranty variables estimates Product Warranty Expense, Increase (Decrease) in Warranty Expense Due to Changes in Warranty Variables Product Warranty Expense, Increase (Decrease) in Warranty Expense Due to Changes in Warranty Variables Percent of end user customers using performance tracking system Percent of Customers Using Performance Tracking System Percent of Customers Using Performance Tracking System Document and Entity Information [Abstract] Document and entity information. Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Well-Known Seasoned Issuer Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Voluntary Filers Entity Current Reporting Status Entity Current Reporting Status Entity Public Float Entity Public Float