Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Shares Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Options outstanding, beginning (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Granted (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Exercised (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 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) Segment Reporting [Abstract] CONCENTRATION OF CREDIT RISK AND MAJOR CUSTOMERS Concentration Risk Disclosure [Text Block] Accounting Policies [Abstract] Accounting Policies [Table] Accounting Policies [Table] Accounting Policies [Table] Eligible Item or Group for Fair Value Option [Axis] Eligible Item or Group for Fair Value Option [Axis] Fair Value, Option, Eligible Item or Group [Domain] Fair Value, Option, Eligible Item or Group [Domain] Warranty obligations Warranty, Rights and Obligations, Fair Value Option [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Products and Services [Axis] Products and Services [Axis] Products and Services [Domain] Products and Services [Domain] Enlighten Enlighten Web-based Monitoring Service [Member] Enlighten Web-based Monitoring Service [Member] 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] Sales prior to January 1, 2014 Microinverter Warranties Issued in Period One [Member] Microinverter Warranties Issued in Period One [Member] Sales since January 1, 2014 Microinverter Warranties Issued in Period Two [Member] Microinverter Warranties Issued in Period Two [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 Allowance for Doubtful Accounts Receivable Property and equipment estimated useful life Property, Plant and Equipment, Useful Life Intangible assets, estimated useful life Finite-Lived Intangible Asset, Useful Life Impairment of intangible assets Impairment of Intangible Assets (Excluding Goodwill) 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 Research and Development Expense Stock-based compensation requisite service period Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period Fair value of liability Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value Equity [Abstract] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Common Stock Common Stock [Member] 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 Proceeds from Issuance Initial Public Offering 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 outstanding (shares) Preferred Stock, Shares Outstanding Convertible preferred stock outstanding, value Preferred Stock, Value, Outstanding 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. Convertible notes, outstanding balance of principal and accrued paid in kind interest Convertible Notes Payable 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 (shares) 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 Commitments and Contingencies Disclosure [Abstract] Schedule of Future Minimum Lease Payments Under Noncancelable Operating Leases Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Schedule of Activity in Allowance for Doubtful Accounts Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Debt Disclosure [Abstract] DEBT AND REVOLVING CREDIT FACILITY Long-term Debt [Text Block] Product Warranties Disclosures [Abstract] WARRANTY OBLIGATIONS Product Warranty Disclosure [Text Block] Income Tax Disclosure [Abstract] Schedule of Domestic and Foreign Components of Loss before Provision for Income Taxes Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] Schedule of Provision for Income Taxes Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] 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] Schedule of Reconciliation of Total Amounts of Unrecognized Tax Benefits Summary of Income Tax Contingencies [Table Text Block] Property, Plant and Equipment [Abstract] Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] 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 Software and Software Development Costs [Member] Leasehold improvements Leasehold Improvements [Member] Construction in progress Construction in Progress [Member] Property, Plant and Equipment [Line Items] 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 Property, Plant and Equipment, Net United States Income (Loss) from Continuing Operations before Income Taxes, Domestic Foreign Income (Loss) from Continuing Operations before Income Taxes, Foreign Loss before income taxes Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest Payables and Accruals [Abstract] Accrued Liabilities [Abstract] Accrued Liabilities [Abstract] Salaries, commissions, incentive compensation and benefits Employee-related Liabilities, Current Customer rebates and sales incentives Accrued Marketing Costs, Current Other Other Accrued Liabilities, Current Total Accrued Liabilities, Current Summary of 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] 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) Number of shares available for issuance (shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Issue of common stock (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. Increase in shares authorized for issuance under plan (shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized Yearly, share increase in reserved shares (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 (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 Income tax benefit recognized relating to stock-based compensation expense Employee Service Share-based Compensation, Tax Benefit from Compensation Expense Income tax benefit realized from exercised stock options Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options 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 (shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number Weighted-average fair value, vested (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 (shares) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options Common stock fair value (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 Summary of Property, Plant and Equipment Property, Plant and Equipment [Table Text Block] STOCKHOLDERS' EQUITY Stockholders' Equity Note Disclosure [Text Block] 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] 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 Warrant obligations at fair value, current Standard Product Warranty Accrual, Current, Fair Value Disclosure Standard Product Warranty Accrual, Current, Fair Value Disclosure Warrant obligations at fair value, noncurrent Standard Product Warranty Accrual, Noncurrent, Fair Value Disclosure Standard Product Warranty Accrual, Noncurrent, Fair Value Disclosure Preferred stock, par value (usd per share) Preferred Stock, Par or Stated Value Per Share Preferred stock, shares authorized (shares) Preferred Stock, Shares Authorized Preferred stock, shares issued (shares) Preferred Stock, Shares Issued Preferred stock, shares outstanding (shares) Common stock, par value (usd per share) Common Stock, Par or Stated Value Per Share Common stock, shares authorized (shares) Common Stock, Shares Authorized Common stock, shares issued (shares) Common Stock, Shares, Issued Common stock, shares outstanding (shares) Common Stock, Shares, Outstanding Business Combinations [Abstract] Summary of Allocated Purchase Price to Acquired Tangible and Identifiable Intangible Assets Based on Estimated Fair Value Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block] Summary of Goodwill and Purchased Intangible Assets Schedule of Intangible Assets and Goodwill [Table Text Block] Schedule of Estimated Future Amortization Expense Related to Finite-lived Intangible Assets Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Current: Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Current Federal Tax Expense (Benefit) State Current State and Local Tax Expense (Benefit) Foreign Current Foreign Tax Expense (Benefit) Total Current Income Tax Expense (Benefit) Deferred: Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Federal Deferred Federal Income Tax Expense (Benefit) State Deferred State and Local Income Tax Expense (Benefit) Foreign Deferred Foreign Income Tax Expense (Benefit) Provision for income taxes Income Tax Expense (Benefit) 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 (shares) 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 Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] 2015 Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 2016 Finite-Lived Intangible Assets, Amortization Expense, Year Two 2017 Finite-Lived Intangible Assets, Amortization Expense, Year Three 2018 Finite-Lived Intangible Assets, Amortization Expense, Year Four 2019 Finite-Lived Intangible Assets, Amortization Expense, Year Five Total Finite-Lived Intangible Assets, Net Inventory Disclosure [Abstract] INVENTORY Inventory Disclosure [Text Block] 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 PROPERTY AND EQUIPMENT, NET Property, Plant and Equipment Disclosure [Text Block] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Customer Relationships Customer Relationships [Member] Patents Patents [Member] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Next Phase Solar, Inc. Next Phase Solar, Inc. [Member] Next Phase Solar, Inc. [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Goodwill, gross Goodwill, Gross Goodwill Goodwill Other indefinite-lived intangibles, gross Indefinite-Lived Intangible Assets (Excluding Goodwill) Intangibles assets with finite lives: Finite-Lived Intangible Assets, Net [Abstract] Finite-lived intangible assets, gross Finite-Lived Intangible Assets, Gross Finite-lived intangible assets, accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Total purchased intangibles, gross Intangible Assets, Gross (Excluding Goodwill) Total purchased intangibles, accumulated amortization Intangible Assets, Accumulated Amortization Intangible Assets, Accumulated Amortization Total purchased intangibles, net Intangible Assets, Net (Excluding Goodwill) Earnings Per Share [Abstract] 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 Employee Stock Option [Member] Unvested restricted stock units Warrants to purchase common stock Warrant [Member] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Total (shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount ASSETS Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Accounts receivable, net of allowances of $569 and $2,000 at December 31, 2014 and 2013, respectively Accounts Receivable, Net, Current Inventory Inventory, Net Prepaid expenses and other Prepaid Expense and Other Assets, Current Total current assets Assets, Current Property and equipment, net Intangibles, 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 Deferred revenues Deferred Revenue, Current Warranty obligations, current portion (includes $1,125 and $0 measured at fair value at December 31, 2014 and 2013, respectively) Product Warranty Accrual, Current Current portion of term loans Loans Payable, Current Total current liabilities Liabilities, Current Long-term liabilities: Liabilities, Noncurrent [Abstract] Deferred revenues, noncurrent Deferred Revenue, Noncurrent Warranty obligations, noncurrent (includes $2,437 and $0 measured at fair value at December 31, 2014 and 2013, respectively) Product Warranty Accrual, Noncurrent Other liabilities Other Liabilities, Noncurrent Term loans, noncurrent 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; 43,756 and 42,123 shares issued and outstanding at December 31, 2014 and 2013, respectively Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Accumulated deficit Retained Earnings (Accumulated Deficit) Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Total stockholders’ equity Stockholders' Equity Attributable to Parent Total liabilities and stockholders’ equity Liabilities and Equity Fair Value Disclosures [Abstract] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Level 3 Fair Value, Inputs, Level 3 [Member] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Recurring Fair Value, Measurements, Recurring [Member] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Warranty Obligations at Fair Value [Roll Forward] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Beginning balance Accruals for warranties issued during period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances Changes in estimates Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability, Change in Estimate Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability, Change in Estimate Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements Increase due to accretion expense Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability, Accretion Expense Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability, Accretion Expense Fair value adjustments Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability, Adjustments Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability, Adjustments Ending balance Basis of Presentation and Consolidation Consolidation, Policy [Policy Text Block] Use of Estimates Use of Estimates, 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] Foreign Currency Forward Contracts 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] Business Combinations Business Combinations Policy [Policy Text Block] Goodwill and Intangible Assets Goodwill and Intangible 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] Contingent Consideration Liability Commitments and Contingencies, Policy [Policy Text Block] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table] Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs, by Report Line [Axis] Income Statement Location [Axis] Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Report Line [Domain] Income Statement Location [Domain] Cost of revenues Cost of Sales [Member] Research and development Research and Development Expense [Member] Sales and marketing Selling and Marketing Expense [Member] General and administrative General and Administrative Expense [Member] Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] Total stock-based compensation expense Allocated Share-based Compensation Expense 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] Equipment financing facility Equipment Financing Facility [Member] Equipment financing facility. Debt Instrument [Line Items] Debt Instrument [Line Items] Unamortized discount Debt Instrument, Unamortized Discount Schedule of Debt Obligations Schedule of Long-term Debt Instruments [Table Text Block] 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 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) Provision for income taxes 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 Shares used in computing net loss per share attributable to common stockholders, basic and diluted (shares) Weighted Average Number of Shares Outstanding, Basic and Diluted Raw materials Inventory, Raw Materials, Gross Finished goods Inventory, Finished Goods, Gross Total inventory Term loan Secured Debt [Member] 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 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 – $0.27 Range One [Member] Range One [Member] $0.64 - $2.54 Range Two [Member] Range Two [Member] $3.35 – $7.44 Range Three [Member] Range Three [Member] $7.50 - $9.53 Range Four [Member] Range Four [Member] $9.54 - $16.01 Range Five [Member] Range Five [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 (shares) Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options Weighted- Average Remaining Life of Outstanding Options 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 (shares) 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 SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] STOCK-BASED COMPENSATION Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Statement of Stockholders' Equity [Abstract] Convertible Preferred Stock Convertible Preferred Stock [Member] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock Additional Paid-In Capital Additional Paid-in Capital [Member] Accumulated Deficit Retained Earnings [Member] Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) [Member] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] BALANCE, Beginning BALANCE, Beginning (shares) Shares, Outstanding 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 (shares) Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Stock-based compensation Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition 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 (shares) 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 (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 (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 Stock Issued During Period, Value, Conversion of Convertible Securities Issuance of common stock upon exercise of warrants (shares) Stock Issued During Period, Shares, Conversion of Convertible Securities Net loss Foreign currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax BALANCE, Ending BALANCE, Ending (shares) RELATED PARTY TRANSACTIONS Related Party Transactions Disclosure [Text Block] FAIR VALUE MEASUREMENTS Fair Value, Measurement Inputs, Disclosure [Text Block] Stock options 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 Revolving Credit Facility Revolving Credit Facility [Member] Term loan 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. 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] 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 drawn from line of credit Proceeds from Lines of Credit Convertible loan facility, remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Debt instrument additional borrowing amount Proceeds from Issuance of Debt Term Loan interest at an annual rate Line of Credit Facility, Interest Rate During Period Interest only period Line of Credit Facility, Interest Only Period Line of Credit Facility, Interest Only Period Credit facility, end of term charge Line of Credit Facility, End of Term Fee Line of Credit Facility, End of Term Fee Repayment of term loans Repayments of Subordinated Debt Equipment financing facility term Debt Instrument, Term 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 Product Warranty Accrual, Warranties Issued Changes in estimates Product Warranty Accrual, Preexisting, Increase (Decrease) Settlements Product Warranty Accrual, Payments Increase due to accretion expense Product Warranty Accrual, Accretion Expense Product Warranty Accrual, Accretion Expense Fair value adjustments Product Warranty Accrual, Fair Value Adjustment Product Warranty Accrual, Fair Value Adjustment Balance, at end of year Less current portion Long-term portion Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] 2015 Operating Leases, Future Minimum Payments Due, Next Twelve Months 2016 Operating Leases, Future Minimum Payments, Due in Two Years 2017 Operating Leases, Future Minimum Payments, Due in Three Years 2018 Operating Leases, Future Minimum Payments, Due in Four Years 2019 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 NET LOSS PER SHARE ATTRIBUTABLE TO COMMON STOCKHOLDERS Earnings Per Share [Text Block] Rent expense Operating Leases, Rent Expense, Net Purchase obligation Purchase Obligation BUSINESS COMBINATION, GOODWILL AND INTANGIBLE ASSETS Business Combination And Intangible Assets Disclosure [Text Block] Business Combination And Intangible Assets 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 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) Statement of Cash Flows [Abstract] Debt, excluding convertible debt Debt, Excluding Convertible Debt [Member] Debt, Excluding Convertible Debt [Member] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] 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 (net of acquisition): 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 and other liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Warranty obligations Product Warranty Accrual, Period Increase (Decrease) Deferred revenues Increase (Decrease) in Deferred Revenue Net cash provided by (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 Purchase of patents Payments to Acquire Intangible Assets Acquisition of a business Payments to Acquire Businesses, Net of Cash Acquired Change in restricted cash (See Note 5) Increase (Decrease) in Restricted Cash 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] 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 Payments of financing costs Payments of Financing Costs 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 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 increase (decrease) in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents — Beginning of period 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] 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 Acquisition-related contingent consideration liability Noncash or Part Noncash Acquisition, Other Liabilities Assumed 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 Weighted Average Assumptions used to Estimate Fair Value of Stock Options Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Summary of Total Stock Based Compensation Expense Components Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block] Summary of Stock Based Compensation Expense Associated with Each Award Type Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] Summary of Stock Option Activity Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Summary of Stock Options Outstanding Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] Summary of Restricted Stock Unit Activity Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] Summary of ESPP Activity Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block] Product Liability Contingency [Table] Product Liability Contingency [Table] Second generation Second Generation Products [Member] Second Generation Products [Member] All product generations All Product Generations [Member] All Product Generations [Member] Third generation Third Generation Products [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 Net 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, Net Product Warranty Expense, Increase (Decrease) in Warranty Expense Due to Changes in Warranty Variables, Net Percent of end user customers using performance tracking system Percent of Customers Using Performance Tracking System Percent of Customers Using Performance Tracking System ACCRUED LIABILITIES Accounts Payable and Accrued Liabilities Disclosure [Text Block] Depreciation and amortization Depreciation Unamortized capitalized software costs Capitalized Computer Software, Net Schedule of Potential Common Shares Outstanding 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] Derivative [Table] Derivative [Table] Contingent consideration Guarantees [Member] Valuation Technique [Axis] Valuation Technique [Axis] Valuation Technique [Domain] Valuation Technique [Domain] Discounted cash flows Income Approach Valuation Technique [Member] 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 gain (loss) on foreign currency Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments Probability adjusted level of revenue Fair Value Inputs, Probability Adjusted Revenue Fair Value Inputs, Probability Adjusted Revenue Decrease to fair value measurement as a result of 100 basis point increase Warranty Obligations at Fair Value, Decrease in Fair Value Resulting from One Percentage Point Increase in Discount Rate Warranty Obligations at Fair Value, Decrease in Fair Value Resulting from One Percentage Point Increase in Discount Rate Increase to fair value measurement as a result of 100 basis point decrease Warranty Obligations at Fair Value, Increase in Fair Value Resulting from One Percentage Point Decrease in Discount Rate Warranty Obligations at Fair Value, Increase in Fair Value Resulting from One Percentage Point Decrease in Discount Rate Contingent consideration earnout period Business Combination, Contingent Consideration Arrangements, Determination Period Business Combination, Contingent Consideration Arrangements, Determination Period 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 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 Total purchase consideration Business Combination, Consideration Transferred Purchase consideration, cash Payments to Acquire Businesses, Gross Purchase consideration, cash withheld Business Combination, Indemnification Assets, Amount as of Acquisition Date Contingent consideration Business Combination, Consideration Transferred, Liabilities Incurred Indemnity hold back period Business Combination, Indemnification Assets, Period Business Combination, Indemnification Assets, Period Contingent consideration, minimum Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low Contingent consideration, maximum Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High Acquisition related costs Business Combination, Acquisition Related Costs Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table] Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table] Warranty obligations for microinverters sold since January 1, 2014 Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] Profit element and risk premium Fair Value Inputs, Profit Element and Risk Premium Fair Value Inputs, Profit Element and Risk Premium Credit-adjusted risk-free rate Fair Value Inputs, Entity Credit Risk Risk-adjusted discount rate Fair Value Inputs, Discount Rate Summary of Inventory Schedule of Inventory, Current [Table Text Block] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] 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] Schedule of Financial Instruments Measured at Fair Value on a Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Schedule of Reconciliation of Beginning and Ending Balances of Warranty Obligations/Contingent Consideration Measured at Fair Value Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Summary of Significant Unobservable Inputs used in the Fair Value Measurements of the Company's Liabilities Designated as Level 3 Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table Text Block] INCOME TAXES Income Tax Disclosure [Text Block] 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 Federal Domestic Tax Authority [Member] State State and Local Jurisdiction [Member] Tax Credit Carryforward [Axis] Tax Credit Carryforward [Axis] Tax Credit Carryforward, Name [Domain] Tax Credit Carryforward, Name [Domain] Research Tax Credit Carryforward Research Tax Credit Carryforward [Member] Income Taxes [Line Items] Income Taxes [Line Items] [Line Items] for Income Taxes [Table] Federal statutory income tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Undistributed earnings of foreign subsidiaries Undistributed Earnings of Foreign Subsidiaries Operating loss carryforwards Operating Loss Carryforwards Research tax credit carryforwards Tax Credit Carryforward, Amount Increase in equity if and when deferred tax assets are ultimately realized Excess Tax Benefit from Share-based Compensation, Operating Activities Unrecognized tax benefits Unrecognized Tax Benefits Increases in balances related to tax positions taken in 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 Change to unrecognized tax benefits Unrecognized Tax Benefits, Period Increase (Decrease) Allowance for Doubtful Accounts Receivable [Roll Forward] Allowance for Doubtful Accounts Receivable [Roll Forward] Balance, at beginning of year Net charges to expenses Allowance for Doubtful Accounts Receivable, Period Increase (Decrease) Write-offs, net of recoveries Allowance for Doubtful Accounts Receivable, Write-offs Balance, at end of year 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 International International [Member] International [Member] Revenues from External Customers and Long-Lived Assets [Line Items] Revenues from External Customers and Long-Lived Assets [Line Items] Revenues SEGMENT AND GEOGRAPHIC INFORMATION Segment Reporting Disclosure [Text Block] Effective Income Tax Rate Reconciliation, Percent [Abstract] Income tax benefit at statutory federal 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 Foreign tax rate and tax law differential Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount Tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Amount Stock-based compensation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Compensation Cost, Amount Other permanent items Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Other nondeductible/nontaxable items 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 Total Purchase Price Payments to Acquire Businesses and Interest in Affiliates [Abstract] Cash consideration Total purchase consideration Net Assets Acquired Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract] Property and equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Customer relationships Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Net assets acquired Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net Summary of Changes in the Company's Product Warranty Liability Schedule of Product Warranty Liability [Table Text Block] Components of Deferred Tax Assets and Liabilities [Abstract] Deferred Tax Assets Deferred Tax Assets, Net of Valuation Allowance, Current Classification [Abstract] Allowances and reserves Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Current Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Current Net operating loss and tax credit carryforwards 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 Total gross deferred tax assets Deferred Tax Assets, Gross Less valuation allowance Deferred Tax Assets, Valuation Allowance, Noncurrent Deferred tax assets, net of valuation allowance Deferred Tax Assets, Net of Valuation Allowance, Noncurrent Deferred tax liabilities Deferred Tax Liabilities, Gross Net deferred tax assets, net of valuation allowance Deferred Tax Assets, Net Schedule of Accrued Liabilities Schedule of Accrued Liabilities [Table Text Block] Level 2 Fair Value, Inputs, Level 2 [Member] Assets: Assets, Fair Value Disclosure [Abstract] Foreign currency forward contracts Foreign Currency Contract, Asset, Fair Value Disclosure Liabilities: Liabilities, Fair Value Disclosure [Abstract] Foreign currency forward contracts Foreign Currency Contracts, Liability, Fair Value Disclosure Warranty obligations/Contingent Consideration COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] Unrecognized tax benefits—at beginning of year Increases in balances related to tax positions taken in prior years Unrecognized tax benefits—at end of year 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 United States China CHINA Other Other Country [Member] Other country. Total Long-Lived Assets Contingent Consideration at Fair Value [Roll Forward] Fair value of contingent consideration—acquisition of NPS Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability, Additions from Business Acquisition Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability, Additions from Business Acquisition Fair value adjustment to contingent consideration