Related Party Transactions [Abstract] RELATED PARTY TRANSACTIONS Related Party Transactions Disclosure [Text Block] Long-term Debt, by Current and Noncurrent [Abstract] LONG-TERM DEBT Long-term Debt [Text Block] Earnings Per Share [Abstract] 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] 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 [Member] Cost of Sales [Member] Research and development [Member] Research and Development Expense [Member] Sales and marketing [Member] Selling and Marketing Expense [Member] General and administrative [Member] 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 NET LOSS PER SHARE ATTRIBUTABLE TO COMMON STOCKHOLDERS Earnings Per Share [Text Block] Product Warranties Disclosures [Abstract] Product Liability Contingency [Table] Product Liability Contingency [Table] Products and Services [Axis] Products and Services [Axis] Products and Services [Domain] Products and Services [Domain] Second generation products [Member] Second Generation Products [Member] Second Generation Products [Member] Third generation products [Member] Third Generation Product s [Member] Third Generation Products [Member] Warranty Variable [Axis] Warranty Variable [Axis] Warranty Variable [Axis] Warranty Variable [Domain] Warranty Variable [Domain] [Domain] for Warranty Variable [Axis] Failure rate [Member] Failure Rate [Member] Failure Rates [Member] Replacement cost [Member] Replacement Cost [Member] Replacement Cost [Member] Claim rate [Member] Claim Rate [Member] Claim Rate [Member] Shipping cost [Member] Shipping Cost [Member] Shipping Cost [Member] Product Liability Contingency [Line Items] Product Liability Contingency [Line Items] Standard Product Warranty Disclosure [Abstract] Standard Product Warranty Disclosure [Abstract] Changes in warranty accrual Product Warranty Accrual, Preexisting, Increase (Decrease) 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 Product warranty term Product Warranty, Term Product Warranty Term Schedule of summary of stock option activity Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of restricted stock unit activity Schedule of Share-based Compensation, Restricted Stock Units Award Activity [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 valuation assumptions of stock options Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Fair Value Disclosures [Abstract] FAIR VALUE OF FINANCIAL INSTRUMENTS Fair Value Disclosures [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Basis of Presentation, Consolidation and Related Party Transactions Basis of Presentation, Consolidation and Related Party Transactions, Policy [Policy Text Block] Basis of Presentation, Consolidation and Related Party Transactions, Policy [Policy Text Block] Unaudited Interim Financial Information Condensed Financial Statements, Policy [Policy Text Block] Condensed Financial Statements, Policy [Policy Text Block] Significant Accounting Policies Comparability of Prior Year Financial Data, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Statement of Cash Flows [Abstract] Statement [Table] Statement [Table] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Statement [Line Items] Statement [Line Items] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Net loss Net Income (Loss) Attributable to Parent 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 Prepayment to supplier Increase (Decrease) in Advance Payments to Suppliers Increase (Decrease) in Advance Payments to Suppliers Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Accounts payable, accrued and other liabilities 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 term loans and debt Proceeds from Issuance of Long-term Debt Repayments of term loans Repayments of Long-term Debt Principal payments under capital leases Repayments of Long-term Capital Lease Obligations Proceeds from issuance of common stock under employee stock plans Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options 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 Noncash financing and investing activities: Noncash Investing and Financing Items [Abstract] Purchases of property and equipment included in accounts payable Capital Expenditures Incurred but 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 Income Tax Disclosure [Abstract] Provision for U.S. federal or state income taxes Current Federal State and Local Tax Expense Benefit Current federal state and local tax expense benefit. Provision for income taxes related to subsidiaries located outside the U.S. Current Foreign Tax Expense (Benefit) 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 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] Fair value, measurements, recurring [Member] 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 [Member] 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 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] Inventory Disclosure [Abstract] Schedule of inventory Schedule of Inventory, Current [Table Text Block] Statement of Financial Position [Abstract] Scenario, Unspecified [Domain] Allowances, accounts receivable Allowance for Doubtful Accounts Receivable 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 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 Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Award Type [Domain] Equity Award [Domain] Employee stock options and restricted stock units [Member] Employee Stock Options and Restricted Stock Units [Member] Employee Stock Options and Restricted Stock Units [Member] Employee Stock Purchase Plan [Member] Employee Stock [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Total stock-based compensation expense Schedule of long-term debt Schedule of Long-term Debt Instruments [Table Text Block] Statement of Comprehensive Income [Abstract] Net loss attributable to common stockholders Other comprehensive (loss) income: Other Comprehensive Income (Loss), Net of Tax [Abstract] Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Comprehensive loss attributable to common stockholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent INCOME TAXES Income Tax Disclosure [Text Block] Derivative [Table] Derivative [Table] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Not designated as hedging instrument [Member] Not Designated as Hedging Instrument [Member] Derivative Instrument Risk [Axis] Derivative Instrument [Axis] Derivative Contract Type [Domain] Derivative Contract [Domain] Foreign exchange forward [Member] 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 Schedule of inventory Inventory, Net [Abstract] Raw materials Inventory, Raw Materials, Gross Finished goods Inventory, Finished Goods, Gross Total inventory Inventory, Net Common stock, shares issued Stock Issued During Period, Shares, New Issues Stock issued during period offering price Share Price Underwriters 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 Conversion of convertible preferred stock into common stock Conversion of Convertible Preferred Stock into Common Stock Conversion of convertible preferred stock into common stock. Convertible notes, outstanding balance of principal and accrued paid in kind interest Convertible Notes Payable Conversion of notes into common stock 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. Conversion price of convertible notes Debt Instrument, Convertible, Conversion Price INVENTORY Inventory Disclosure [Text Block] STOCK-BASED COMPENSATION Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Restricted Stock [Member] Restricted Stock [Member] Fair value of options exercised during period Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercised in Period, Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercised in Period, Fair Value Intrinsic value of options outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Fair value of stock vested during period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value 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 Total unrecognized compensation cost Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Weighted-average recognition period for unrecognized compensation cost Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition ASSETS Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Accounts receivable, net of allowances of $1,460 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 Product Warranty Accrual, Noncurrent Other liabilities Other Liabilities, Noncurrent Term loans Loans Payable, 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; 41,813 and 40,856 shares issued and outstanding as of September 30, 2013 and December 31, 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 Stockholders' Equity Attributable to Parent Total liabilities and stockholders’ equity Liabilities and Equity WARRANTY OBLIGATIONS Product Warranty Disclosure [Text Block] Number of Shares Outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Outstanding at December 31, 2012 (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Canceled (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period Outstanding at September 30, 2013 (in shares) Weighted- Average Exercise Price per Share Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Outstanding at December 31, 2012 (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Granted (in usd per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Exercised (in usd per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Canceled (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Outstanding at September 30, 2013 (in usd per share) 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] Term loans [Member] Secured Debt [Member] Equipment Financing Facility [Member] Equipment Financing Facility [Member] Equipment financing facility. Debt Instrument [Line Items] Debt Instrument [Line Items] 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 Unamortized discount Debt Instrument, Unamortized Discount Stock Issuance from Initial Public Offering [Abstract] Stock Issuance from Initial Public Offering [Abstract] Stock Issuance from Initial Public Offering [Abstract] Common stock shares issued from the IPO Conversion of preferred stock into common stock (in shares) Stock Issued During Period, Shares, Conversion of Convertible Securities Income Statement [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 income (expense), net: Other Nonoperating Income (Expense) [Abstract] Interest expense Interest Expense Other income (expense) Other Nonoperating Income (Expense) Total 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 loss per share attributable to common stockholders, basic and diluted (usd per share) Income (Loss) from Continuing Operations, Per Basic and Diluted Share Shares used in computing net loss per share attributable to common stockholders, basic and diluted Weighted Average Number of Shares Outstanding, Basic and Diluted Restricted stock units [Member] Restricted Stock Units (RSUs) [Member] Restricted Stock Units Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Outstanding at December 31, 2012 (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Canceled (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Outstanding at September 30, 2013 (in 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 at December 31, 2012 (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Granted (in 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 (in 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 (in 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 at September 30, 2013 (in usd per share) Overview and Summary of Significant Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [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 period Product Warranty Accrual Accruals for warranties issued during the period Extended Product Warranty Accrual, Warranties Issued Changes in estimates Settlements Standard Product Warranty Accrual, Payments Balance, at end of period Current portion included in accrued liabilities Product Warranty Accrual, Current Long-term portion 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. [Member] 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 Stock options [Member] Employee Stock Option [Member] The fair value of each option granted during the periods Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Expected term 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 grant date fair value Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value 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] Stock options to purchase common stock [Member] Restricted stock units [Member] Warrants to purchase common stock [Member] Warrant [Member] 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 Changes in the Company's product warranty liability Schedule of Product Warranty Liability [Table Text Block] Lender Name [Axis] Lender Name [Axis] Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Wells Fargo Bank [Member] Wells Fargo Bank [Member] Wells Fargo Bank. Hercules Technology Growth Capital Inc [Member] Hercules Technology Growth Capital, Inc. Revolving Credit Facility [Member] Revolving Credit Facility [Member] Secured Debt [Member] Equipment Financing Facility [Member] Number of debt agreements Line of Credit, Number of Debt Agreements Line of Credit, Number of Debt Agreements Credit line facility Line of Credit Facility, Maximum Borrowing Capacity Debt instrument additional borrowing amount Proceeds from Issuance of Debt Commitments and Contingencies Disclosure [Abstract] COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block]