Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Amortization of debt discount Amortization of Debt Discount (Premium) China CHINA Share-based compensation, additional shares authorized (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized Service period Revenue From Contract With Customer, Service Period Revenue From Contract With Customer, Service Period Convertible notes embedded derivative Embedded derivative, beginning balance Embedded derivative, ending balance Embedded Derivative, Fair Value of Embedded Derivative Liability Debt issuance costs Debt Issuance Costs, Gross WARRANTY OBLIGATIONS Product Warranty Disclosure [Text Block] Allowances and reserves Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Current Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Current Statistical Measurement [Domain] Statistical Measurement [Domain] LIABILITIES AND STOCKHOLDERS’ EQUITY Liabilities and Equity [Abstract] Risks and Uncertainties [Abstract] Risks and Uncertainties [Abstract] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Changes in the Company's product warranty liability Movement in Standard and Extended Product Warranty Accrual, Increase (Decrease) [Roll Forward] Equity component of convertible notes due 2025, net Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt Security Exchange Name Security Exchange Name Sales and marketing Selling and Marketing Expense [Member] Proceeds from debt, net of issuance costs Proceeds from debt, net of issuance costs Proceeds from Issuance of Long-term Debt Total current liabilities Liabilities, Current $1.29 —– $1.29 Range Two [Member] Range Two [Member] Performance shares Performance Shares [Member] Products and services delivered over time Transferred over Time [Member] Prepaid expenses and other assets Prepaid Expense and Other Assets, Current Outstanding, beginning balance (in usd per share) Outstanding, ending balance (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 Expected to vest Share-based Compensation Arrangement by Share-based Payment Award, Other than Options, Expected to Vest, Weighted Average Remaining Contractual Term Share-based Compensation Arrangement by Share-based Payment Award, Other than Options, Expected to Vest, Weighted Average Remaining Contractual Term ASSETS Assets [Abstract] Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] AC Battery Storage Solution AC Battery Storage Solution [Member] AC Battery Storage Solution [Member] Accounting Policies [Abstract] Accounting Policies [Abstract] Revenue, Major Customer [Line Items] Revenue, Major Customer [Line Items] Envoy Communications Gateway Envoy Communications Gateway [Member] Envoy Communications Gateway [Member] Cash and Cash Equivalents and Restricted Cash Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Issuance of common stock from exercise of equity awards and employee stock purchase plan Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture Operating cash flows from operating leases Operating Lease, Payments Convertible Notes Convertible Notes Payable [Member] ACCRUED LIABILITIES Accounts Payable and Accrued Liabilities Disclosure [Text Block] Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Amortization period for acquired intangible assets Useful Life Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 2021 Lessee, Operating Lease, Liability, to be Paid, Year One Share-based compensation, outstanding (in shares) Outstanding, beginning balance (in shares) Outstanding, ending balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 2024 Lessee, Operating Lease, Liability, to be Paid, Year Four Schedule of Liabilities Measured at Fair Value on a Recurring Basis Schedule of Fair Value Of Convertible Notes Hedge and Warrants Liability Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Warranty obligations Increase (Decrease) In Warranty Obligations Increase (Decrease) In Warranty Obligations Total unrecognized compensation cost Total unrecognized compensation cost Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Safe harbor prepayments Contract With Customer Increase Due To Safe Harbor Prepayments Contract With Customer Increase Due To Safe Harbor Prepayments State Current State and Local Tax Expense (Benefit) Tax credit carryforward Tax Credit Carryforward, Amount Exercise price range, lower limit (usd per share) Share-based Payment Arrangement, Option, Exercise Price Range, Lower Range Limit Diluted (in USD per share) Net income per share, diluted (in USD per share) Income (Loss) from Continuing Operations, Per Diluted Share Share-based compensation, evergreen shares (in shares) Share Based Compensation Arrangement by Share Based Payment Award Evergreen Shares Share based compensation arrangement by share based payment award evergreen shares. Total operating expenses Operating Expenses Other comprehensive income (loss): Other Comprehensive Income (Loss), Net of Tax [Abstract] Non-cash settlement and other Restructuring Reserve, Settled without Cash Common stock, par value (in usd per share) Common stock, par value (in usd per share) Common Stock, Par or Stated Value Per Share Other liabilities Other Liabilities, Noncurrent Deferred tax assets, net Deferred Income Tax Assets, Net Canceled (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price Fair Value Option, Disclosures [Table] Fair Value Option, Disclosures [Table] Effect of exchange rate changes on cash and cash equivalents Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Inventory Total inventory Inventory, Net Aggregate intrinsic value, expected to vest Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Intrinsic Value, Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Expected to Vest, Intrinsic Value, Value Measurement Frequency [Domain] Measurement Frequency [Domain] Percentage of concentration risk % of Total Consideration Concentration Risk, Percentage Statement [Line Items] Statement [Line Items] Schedule of Potentially Dilutive Securities Excluded from the Computation of Diluted Net Income Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Computer equipment Computer Equipment [Member] Measurement Input Type [Domain] Measurement Input Type [Domain] Statement [Table] Statement [Table] Write-offs, net of recoveries Accounts Receivable, Allowance for Credit Loss, Writeoff Warranty Obligations Standard Product Warranty, Policy [Policy Text Block] Type of Restructuring [Domain] Type of Restructuring [Domain] Statistical Measurement [Axis] Statistical Measurement [Axis] India INDIA Warrants issued, strike price (in USD per share) Class of Warrant or Right, Exercise Price of Warrants or Rights Entity Small Business Entity Small Business Number of shares issued (in shares) Sale of Stock, Number of Shares Issued in Transaction Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Cost of revenues Cost of revenues Cost of Revenue Amendment Flag Amendment Flag 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] Denominator: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Balance at beginning of period Balance at end of period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Share-based compensation, shares authorized (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Share-based compensation, shares available for grant (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Other Other Accrued Liabilities, Current Product Warranty Liability [Line Items] Product Warranty Liability [Line Items] $1.37 —– $14.58 Range Four [Member] Range Four [Member] RESTRUCTURING Restructuring and Related Activities Disclosure [Text Block] Measurement Frequency [Axis] Measurement Frequency [Axis] Financing Receivable Financing Receivable [Member] Allowance for Doubtful Accounts Receivables, Trade and Other Accounts Receivable, Allowance for Doubtful Accounts, Policy [Policy Text Block] Fair Value, Option, Eligible Item or Group [Domain] Financial Instruments [Domain] Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block] Purchases of fixed assets included in accounts payable Capital Expenditures Incurred but Not yet Paid SUBSEQUENT EVENTS Subsequent Events [Text Block] Term of lease contract, maximum renewal term Lessee, Operating Lease, Renewal Term Commitments and Contingencies Commitments and Contingencies, Policy [Policy Text Block] Long-Lived Tangible Asset [Axis] Long-Lived Tangible Asset [Axis] Employee stock purchase plan Employee Stock [Member] Discount Rate Discount Rate [Member] Discount Rate Accounts Receivable, Allowance for Credit Loss, Current Accounts Receivable, Allowance for Credit Loss, Current Issuance of common stock related to acquisition Stock Issued During Period, Value, Acquisitions Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Report Line [Domain] Income Statement Location [Domain] 2022 Lessee, Operating Lease, Liability, to be Paid, Year Two State and Local Jurisdiction State and Local Jurisdiction [Member] Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Accounts Receivable, Second Largest Customer Accounts Receivable, Second Largest Customer [Member] Accounts Receivable, Second Largest Customer [Member] Components of Lease Lease, Cost [Table Text Block] Measurement period percentage of stock price trigger Debt Instrument, Convertible, Measurement Period Percentage Of Stock Price Trigger Debt Instrument, Convertible, Measurement Period Percentage Of Stock Price Trigger 2023 Lessee, Operating Lease, Liability, to be Paid, Year Three Other assets Other Assets, Noncurrent Plan Name [Axis] Plan Name [Axis] 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 Warrants (issued in conjunction with Notes due 2024) (in shares) Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants Conversion of debt Debt Conversion, Converted Instrument, Amount Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Total assets Assets RELATED PARTY Related Party Transactions Disclosure [Text Block] Accrued Liabilities [Abstract] Accrued Liabilities [Abstract] Interest income Interest Income, Deposits with Financial Institutions Exercise Price Range [Domain] Exercise Price Range [Domain] Total interest cost recognized Total interest cost recognized Interest Expense, Debt Outstanding, beginning balance (in shares) Outstanding, ending balance (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Conversion of convertible notes due 2023, net (in shares) Conversion shares (in shares) Debt Conversion, Converted Instrument, Shares Issued Subsequent Event Type [Axis] Subsequent Event Type [Axis] Antidilutive Securities [Axis] Antidilutive Securities [Axis] IRS limitation for employees right to acquire class common stock under ESPP 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. Cost of revenues Cost of Sales [Member] Stock-based compensation Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Amount Weighted-average exercise price, exercisable (in usd per share) Options Exercisable - weighted-average exercise price (usd per share) Share-based Payment Arrangement, Option, Exercise Price Range, Exercisable, Weighted Average Exercise Price Revenue, Initial Application Period Cumulative Effect Transition [Line Items] Revenue, Initial Application Period Cumulative Effect Transition [Line Items] Total liabilities Liabilities Expected volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Less: imputed lease interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Vested and expected to vest Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Level 1 Fair Value, Inputs, Level 1 [Member] Embedded derivative, host contract Embedded Derivative, Host Contract Embedded Derivative, Host Contract Inventory Increase (Decrease) in Inventories After August 1, 2012 After August 1, 2012 [Member] After August 1, 2012 Product warranty, term Product Warranty, Term Product Warranty Term Number of Shares Outstanding Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Net operating loss and tax credit carryforwards Deferred Tax Assets, Operating Loss Carryforwards, Noncurrent Deferred Tax Assets, Operating Loss Carryforwards, Noncurrent Stock options and RSUs and PSUs Employee Stock Options and Restricted Stock Units [Member] Employee Stock Options and Restricted Stock Units [Member] Additional Paid-In Capital Additional Paid-in Capital [Member] Expected Term Measurement Input, Expected Term [Member] Basic (in USD per share) Net income per share, basic (in USD per share) Net income per share, basic (in USD per share) Income (Loss) from Continuing Operations, Per Basic Share Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Equipment and machinery Machinery and Equipment [Member] Fair Value of Financial Instruments Fair Value of Financial Instruments, Policy [Policy Text Block] Common stock, shares outstanding (in shares) Balance, beginning of period (in shares) Balance, ending of period (in shares) Common Stock, Shares, Outstanding Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Income (loss) before income taxes Income (loss) before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Outstanding, beginning balance (in usd per share) Outstanding, ending balance (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Comprehensive Income (Loss) Comprehensive Income, Policy [Policy Text Block] Acquisition Payments to Acquire Businesses, Net of Cash Acquired Common stock, shares authorized (in shares) Common stock, shares authorized (in shares) Common Stock, Shares Authorized Voting interests acquired Business Acquisition, Percentage of Voting Interests Acquired Summary of Restricted Stock Unit Activity Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] Employee stock-based awards (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Property and equipment, gross Property, Plant and Equipment, Gross Federal Deferred Federal Income Tax Expense (Benefit) Third and Fourth Generation Third and Fourth Generation [Member] Third and Fourth Generation [Member] Income Statement [Abstract] Income Statement [Abstract] Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Prepaid expenses and other assets Increase (Decrease) in Prepaid Expense and Other Assets Convertible Senior Notes Due 2023 Convertible Senior Notes Due 2023 [Member] Convertible Senior Notes Due 2023 [Member] Less unamortized discount and issuance costs Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net Use of Estimates Use of Estimates, Policy [Policy Text Block] Income Tax Authority [Domain] Income Tax Authority [Domain] RSU's and PSU's RSU's and PSU's [Member] RSU's and PSU's Capitalized software costs Software and Software Development Costs [Member] Restructuring Reserve [Roll Forward] Restructuring Reserve [Roll Forward] Scenario [Domain] Scenario [Domain] Counterparty Name [Domain] Counterparty Name [Domain] Purchases of property and equipment Payments to Acquire Property, Plant, and Equipment Increased Tariffs And Labor Reimbursement Costs Increased Tariffs And Labor Reimbursement Costs [Member] Increased Tariffs And Labor Reimbursement Costs Warrant mark-to-mark adjustment Effective Income Tax Reconciliation, Warrant Mark-to-Mark Adjustment Effective Income Tax Reconciliation, Warrant Mark-to-Mark Adjustment DEBT Long-term Debt [Text Block] GOODWILL AND INTANGIBLE ASSETS Goodwill and Intangible Assets Disclosure [Text Block] Property, Plant and Equipment [Abstract] Property, Plant and Equipment [Abstract] Mexico MEXICO Section 301 Tariff Refunds Section 301 Tariff Refunds [Member] Section 301 Tariff Refunds [Member] Equity, measurement input Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Measurement Input Business Combination, Consideration Transferred, Equity Interests Issued and Issuable, Measurement Input Profit element and risk premium Measurement Input, Profit Element And Risk Premium [Member] Measurement Input, Profit Element And Risk Premium [Member] Summary of Inventory Schedule of Inventory, Current [Table Text Block] Product Warranties Disclosures [Abstract] Product Warranties Disclosures [Abstract] Potential positive impact of approval of requested Tariff refunds Gain Contingency, Unrecorded Amount Payment of withholding taxes related to net share settlement of equity awards Payment, Tax Withholding, Share-based Payment Arrangement Restructuring and Related Costs Restructuring and Related Costs [Table Text Block] SELECTED UNAUDITED QUARTERLY FINANCIAL INFORMATION Quarterly Financial Information [Text Block] Warranty obligations, measurement input Product Warranty Obligations, Measurement Input Product Warranty Obligations, Measurement Input New Zealand NEW ZEALAND Property, plant and equipment, useful life Estimated Useful Life Property, Plant and Equipment, Useful Life Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Share-based Payment Arrangement, Option, Exercise Price Range [Table] Share-based Payment Arrangement, Option, Exercise Price Range [Table] Net deferred tax asset Deferred Tax Assets, Net Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table] $0.70 —– $1.11 Range One [Member] Range One [Member] Convertible Senior Notes Due 2025 Convertible Senior Notes Due 2025 [Member] Convertible Senior Notes Due 2025 [Member] Share-based Payment Arrangement [Abstract] Share-based Payment Arrangement [Abstract] 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 Operating lease liabilities, current Operating lease liabilities, current (Accrued liabilities) Operating Lease, Liability, Current Warranty obligations, beginning of period Warranty obligations, end of period Total warranty obligations measured at fair value Standard and Extended Product Warranty Accrual 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 Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Fair Value Measurements Fair Value Disclosures [Text Block] Accounts receivable Accounts Receivable [Member] Name of Major Customer [Domain] Customer [Domain] Cumulative Effect, Period of Adoption, Adjustment Cumulative Effect, Period of Adoption, Adjustment [Member] Increase in common stock shares reserved for future issuance percentage Increase in Common Stock Shares Reserved for Future Issuance Percentage Increase in common stock shares reserved for future issuance percentage. Claim Rates Claim Rates [Member] Claim Rates Entity Registrant Name Entity Registrant Name Subsequent Event Type [Domain] Subsequent Event Type [Domain] Business Acquisition [Line Items] Business Acquisition [Line Items] Weighted average discount rate Operating Lease, Weighted Average Discount Rate, Percent Asset impairment Asset impairments Asset Impairment Charges Sale of warrants Proceeds from sale of warrants Proceeds from Issuance of Warrants Unamortized debt issuance costs Debt Issuance Costs, Net Weighted- Average Exercise Price per Share Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Lease Loss Reserves and Contractual Obligations Contract Termination [Member] Asset impairments Asset Impairments [Member] Asset Impairments Equity component of convertible notes due 2025, net Stock Issued During Period, Value, Conversion of Convertible Securities Entity Incorporation, State Entity Incorporation, State or Country Code Restructuring reserve, beginning Restructuring reserve, ending Restructuring Reserve Tax Credit Carryforward [Table] Tax Credit Carryforward [Table] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Total deferred tax assets Deferred Tax Assets, Net of Valuation Allowance Net Revenue, Second Largest Customer Net Revenue, Second Largest Customer [Member] Net Revenue, Second Largest Customer [Member] Period Two Debt Instrument, Redemption, Period Two [Member] Share-based compensation, purchase price of common stock percent to fair market value Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent Restructuring Type [Axis] Restructuring Type [Axis] Goodwill Goodwill, Net Goodwill Labor Reimbursement Costs Labor Reimbursement Costs [Member] Labor Reimbursement Costs Total acquisition related costs Business Acquisition, Transaction Costs Warrants Warrant [Member] Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] Charges Restructuring Costs and Asset Impairment Charges Timing of Transfer of Good or Service [Axis] Timing of Transfer of Good or Service [Axis] Purchase of convertible note hedges Payment for bonds hedge Payments for Hedge, Financing Activities Debt instrument face amount Debt Instrument, Face Amount Revenue recognized Contract With Customer, Asset, Amount Recognized Contract With Customer, Asset, Amount Recognized Equity [Abstract] Equity [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] Restructuring Plan 2016 Restructuring Plan 2016 [Member] Restructuring Plan 2016 [Member] Schedule of Goodwill and Intangible Assets Schedule of Intangible Assets and Goodwill [Table Text Block] Other indefinite-lived intangibles, Additions Indefinite-lived Intangible Assets Acquired Deferred revenues, current Short-term contract liabilities (Deferred revenues) Contract with Customer, Liability, Current Accounting Standards Update [Extensible List] Accounting Standards Update [Extensible List] Granted (in usd per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Customer concentration risk Customer Concentration Risk [Member] Diluted (in shares) Weighted average common shares outstanding for diluted calculation (in shares) Weighted Average Number of Shares Outstanding, Diluted Letter of credit Letter of Credit [Member] Net revenue Net Revenue [Member] Net Revenue [Member] Number of operating segments Number of Operating Segments Canceled (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Debt Disclosure [Abstract] Debt Disclosure [Abstract] Sales and marketing Sales and marketing Selling and Marketing Expense Restructuring Plan [Axis] Restructuring Plan [Axis] Non-cash interest expense Amortization of Debt Issuance Costs and Discounts Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Principal payments and financing fees on debt Repayments of Long-term Debt Sale of warrants related to the convertible notes Adjustments to Additional Paid in Capital, Warrant Issued Summary of Stock Option Outstanding Share-based Payment Arrangement, Option, Exercise Price Range [Table Text Block] Total estimated revenue expected to be recognized in future periods Revenue, Remaining Performance Obligation, Amount Revenues from External Customers and Long-Lived Assets [Line Items] Revenues from External Customers and Long-Lived Assets [Line Items] Tariff refund Gain Contingency, Tariff Refund Gain Contingency, Tariff Refund Partial repurchase of convertible notes due 2024 Repurchase For Repurchase Of Convertible Note Repurchase For Repurchase Of Convertible Note Unrecognized tax benefits—at beginning of year Unrecognized tax benefits—at end of year Unrecognized Tax Benefits Tax Credit Carryforward, Name [Domain] Tax Credit Carryforward, Name [Domain] Counterparty Name [Axis] Counterparty Name [Axis] Common stock, $0.00001 par value, 200,000 shares and 150,000 shares authorized; and 128,962 shares and 123,109 shares issued and outstanding at December 31, 2020 and December 31, 2019, respectively Common Stock, Value, Issued Deferred revenue Deferred Tax Assets, Deferred Income, Noncurrent Deferred Tax Assets, Deferred Income, Noncurrent Consultants engaged in restructuring activities Consultants Engaged In Restructuring Activities [Member] Consultants Engaged In Restructuring Activities Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Document Fiscal Year Focus Document Fiscal Year Focus Cash and Cash Equivalents [Axis] Cash and Cash Equivalents [Axis] Debt, current Less: current portion of convertible notes and long-term financing receivable recorded as debt Debt, current Long-term Debt, Current Maturities Entity Current Reporting Status Entity Current Reporting Status Price per share issued (in usd per share) Sale of Stock, Price Per Share Increase due to accretion expense Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Increase in liability as a result of increasing the profit element and risk premium input by 100 basis points Warranty Obligations At Fair Value, Increase In Fair Value Liability, Resulting From One Percentage Point Increase In Profit Element And Risk Premium Warranty Obligations At Fair Value, Increase In Fair Value Liability, Resulting From One Percentage Point Increase In Profit Element And Risk Premium Communication Accessories Communication Accessories [Member] Communication Accessories [Member] Related Party Transaction [Axis] Related Party Transaction [Axis] Earnings Per Share Earnings Per Share, Policy [Policy Text Block] 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 Inventory Disclosure [Abstract] Inventory Disclosure [Abstract] Common stock, shares issued (in shares) Common Stock, Shares, Issued Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Other Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Increase (Decrease) in Other Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Increase (Decrease) in Other Options outstanding, number of shares (shares) Share-based Payment Arrangement, Option, Exercise Price Range, Shares Outstanding Total operating lease liabilities Total lease liabilities Operating Lease, Liability Debt, noncurrent Long-term debt Long-term Debt, Excluding Current Maturities Segment Reporting [Abstract] Segment Reporting [Abstract] Debt Instrument [Line Items] Debt Instrument [Line Items] Total stockholders’ equity Balance, beginning of period Balance, end of period Stockholders' Equity Attributable to Parent Accounts Receivables and Contract Assets Accounts Receivables And Contract Assets [Policy Text Block] Accounts Receivables And Contract Assets Consideration transferred for business acquisition Total Business Combination, Consideration Transferred Foreign tax rate and tax law differential Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount Common stock issued for business acquisition (in shares) Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Before August 1, 2012 Before August 1, 2012 [Member] Before August 1, 2012 Raw materials Inventory, Raw Materials, Gross Entity Address, City or Town Entity Address, City or Town Salaries, commissions, incentive compensation and benefits Employee-related Liabilities, Current Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Restricted stock units Restricted Stock Units (RSUs) [Member] Share-based compensation, maximum employee subscription rate Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate 2025 Lessee, Operating Lease, Liability, to be Paid, Year Five Eligible Item or Group for Fair Value Option [Axis] Financial Instrument [Axis] Developed technology Intellectual Property [Member] Fees paid for repurchase and exchange of convertible notes due 2023 Gain (Loss) on Repurchase of Debt Instrument Liabilities: Liabilities [Abstract] Construction in process Construction in Progress [Member] Revenue Recognition, Cost of Revenues and Contract Liabilities Revenue from Contract with Customer [Policy Text Block] Credit-adjusted risk-free rate Measurement Input, Entity Credit Risk [Member] Changes in operating assets and liabilities: Increase (Decrease) in Operating Assets [Abstract] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Total current assets Assets, Current Earnings Per Share [Abstract] Earnings Per Share [Abstract] Operating loss carryforwards Operating Loss Carryforwards Debt converted Debt Conversion, Original Debt, Amount Restructuring charges Restructuring charges Restructuring Charges Schedule of Deferred Tax Assets and Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Warranty obligations, noncurrent (includes $20,469 and $13,012 measured at fair value at December 31, 2020 and December 31, 2019, respectively) Noncurrent Warranty obligations, non-current Product Warranty Accrual, Noncurrent Warranty Variable [Axis] Warranty Variable [Axis] Warranty Variable Convertible notes hedge, beginning balance Convertible notes hedge, ending balance Derivative Instruments and Hedges, Noncurrent Stockholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Document Fiscal Period Focus Document Fiscal Period Focus Warranty Variable [Domain] Warranty Variable [Domain] Warranty Variable Increase in liability as a result of decreasing the discount rate by 100 basis points 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 Restructuring Plan 2018 Restructuring Plan 2018 [Member] Restructuring Plan 2018 [Member] Sofdesk Sofdesk Inc. [Member] Sofdesk Inc. Redemption price percentage Debt Instrument, Redemption Price, Percentage Entity Filer Category Entity Filer Category Summary of the Components of Total Stock-Based Compensation Expense Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Common Stock Common Stock [Member] Product and Service [Domain] Product and Service [Domain] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Stock trigger price (in USD per share) Debt Instrument, Convertible, Stock Price Trigger Deferred cost of goods sold Deferred Tax Liabilities, Inventory Leasehold improvements Leasehold Improvements [Member] Exercise of convertible notes due 2024 (in shares) Convertible Notes, Hedge, Unwound Convertible Notes, Hedge, Unwound Interest rate Debt Instrument, Interest Rate, Stated Percentage Total estimated revenue expected to be recognized in future periods, expected timing Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Write off of deferred debt issuance cost Write off of Deferred Debt Issuance Cost Supplemental disclosures of non-cash investing and financing activities: Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract] Exercised (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Net increase in cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect ACQUISITION Business Combination Disclosure [Text Block] Total other expense, net Nonoperating Income (Expense) Stock options Employee stock-based awards Share-based Payment Arrangement, Option [Member] Subsequent Events [Abstract] Subsequent Events [Abstract] State Deferred State and Local Income Tax Expense (Benefit) Redundancy and employee severance and benefit arrangements Redundancy and Employee Severance and Benefits Employee Severance [Member] United States Income (Loss) from Continuing Operations before Income Taxes, Domestic Cash paid for interest Interest Paid, Excluding Capitalized Interest, Operating Activities Investment without readily determinable fair value Equity Securities without Readily Determinable Fair Value, Amount Additional paid-in capital Additional Paid in Capital Schedule of Derivative Instruments Schedule of Derivative Instruments [Table Text Block] Employee Stock Purchase Plan (ESPP) Employee Stock Purchase Plan (ESPP) [Member] Employee Stock Purchase Plan (ESPP) Share-based Compensation, Performance Shares Award Outstanding Activity Share-based Payment Arrangement, Performance Shares, Outstanding Activity [Table Text Block] Impairment of intangible assets Impairment of Intangible Assets (Excluding Goodwill) Total liabilities measured at fair value Financial and Nonfinancial Liabilities, Fair Value Disclosure Accrued liabilities Total accrued liabilities 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] Deferred tax liabilities: Deferred Tax Liabilities, Net [Abstract] Common stock issued Common stock issued Issuance of Common Stock Business Combination, Consideration Transferred, Equity Interests Issued and Issuable Schedule of Debt Schedule of Debt [Table Text Block] Goodwill and Intangible Assets Goodwill and Intangible Assets, Policy [Policy Text Block] Financing Receivable Recorded as Debt Financing Receivable Recorded As Debt Financing Receivable Recorded As Debt [Member] Financing Receivable Recorded As Debt [Member] Depreciation expense Depreciation Entity Address, Address Line One Entity Address, Address Line One Tax credits Effective Income Tax Rate Reconciliation, Tax Credit, Amount Entity Emerging Growth Company Entity Emerging Growth Company Other indefinite-lived intangibles Indefinite-lived Intangible Assets (Excluding Goodwill) Number of consecutive trading days Debt Instrument, Convertible, Threshold Consecutive Trading Days Total Deferred Income Tax Expense (Benefit) Limitation for number of shares to be transferred by acquiree, period Business Combination, Limitation For Number Of Shares To Be Transfered By Acquiree, Period Business Combination, Limitation For Number Of Shares To Be Transfered By Acquiree, Period Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Maximum Maximum [Member] 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 Accounts Receivable, Largest Customer Accounts Receivable, Largest Customer [Member] Accounts Receivable, Largest Customer [Member] Other nondeductible/nontaxable items Income Tax Reconciliation, Nondeductible and Nontaxable Expense Other Income Tax Reconciliation Nondeductible and Nontaxable Expense Other 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] Weighted-Average Remaining Contractual Term Weighted-Average Remaining Contractual Term Share-based Compensation Arrangement by Share-based Payment Award, Weighted-Average Remaining Contractual Term (in years) CONCENTRATION OF CREDIT RISK AND MAJOR CUSTOMERS Concentration Risk Disclosure [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] Balance, at beginning of year Balance, at end of year Accounts Receivable, Allowance for Credit Loss Warrants obligations measured at fair value Warrants liability, beginning balance Warrants liability, ending balance Warrants and Rights Outstanding $1.31 —– $1.31 Range Three [Member] Range Three [Member] Product warranty, measured at fair value, current enph_ProductWarrantyAccrualCurrentFairValueDisclosure enph_ProductWarrantyAccrualCurrentFairValueDisclosure Trading Symbol Trading Symbol Revenue from related parties Revenue from Related Parties Freight Accrued Freight Costs Accrued Freight Costs Schedule of Revenues from External Customers and Long-Lived Assets [Table] Schedule of Revenues from External Customers and Long-Lived Assets [Table] Outstanding 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 Proceeds from exercise of equity awards and employee stock purchase plan Proceeds, Issuance of Shares, Share-based Payment Arrangement, Including Option Exercised Settlements Standard Product Warranty Accrual, Decrease for Payments Revenue, Initial Application Period Cumulative Effect Transition [Table] Revenue, Initial Application Period Cumulative Effect Transition [Table] Deemed repayment of convertible notes due 2024 attributable to accreted debt discount Deemed Repayment Of Convertible Notes Attributable To Accreted Debt Discount Deemed Repayment Of Convertible Notes Attributable To Accreted Debt Discount Balance, beginning of period Balance, end of period Contract with Customer, Asset, after Allowance for Credit Loss Number of shares outstanding, expected to vest (in shares) Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Expected To Vest, Outstanding, Number Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Expected To Vest, Outstanding, Number Summary of Estimated Revenue Expected to be Recognized in Future Periods Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] Notes payable fair value Notes Payable, Fair Value Disclosure GILTI Effective Income Tax Rate Reconciliation, Global Intangible Low-Taxed Income, Amount Effective Income Tax Rate Reconciliation, Global Intangible Low-Taxed Income, Amount Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Foreign Income (Loss) from Continuing Operations before Income Taxes, Foreign Entity Shell Company Entity Shell Company Fair Value Measurement Inputs and Valuation Techniques [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Line Items] Recurring Fair Value, Recurring [Member] Entity Public Float Entity Public Float Business Combinations Business Combinations Policy [Policy Text Block] Document Type Document Type ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Other expense, net Other income (expense) Other Nonoperating Income (Expense) Summary of Warranty Activities Schedule of Product Warranty Liability [Table Text Block] Grants in period (in shares) Granted (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross Accounts payable, accrued and other liabilities Increase (Decrease) in Accounts Payable and Accrued Liabilities Payables and Accruals [Abstract] Payables and Accruals [Abstract] Summary of identifiable intangible assets acquired Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block] 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 Goodwill Deferred Tax Liabilities, Goodwill Schedule of Restructuring and Related Costs [Table] Schedule of Restructuring and Related Costs [Table] Level 3 Fair Value, Inputs, Level 3 [Member] Leases Lessee, Leases [Policy Text Block] Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Warranty obligations, current (includes $8,267 and $6,794 measured at fair value at December 31, 2020 and December 31, 2019, respectively) Less: current portion Warranty obligations, current Product Warranty Accrual, Current Write off of debt discount Write Off Of Debt Discount Write Off Of Debt Discount Intangible assets, net Total purchased intangible assets, Net Intangible Assets, Net (Excluding Goodwill) Proceeds from convertible debt Proceeds from Convertible Debt Income from operations Operating Income (Loss) Options outstanding - weighted- average exercise price (usd per share) Share-based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Exercise Price Summary of Contract Assets and Contract Liabilities, and Changes in Balances from Contracts with Customers Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] General duration of employee stock purchase plan General Duration of Employee Stock Purchase Plan General duration of employee stock purchase plan. Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Commitments and contingencies (Note 12) Commitments and Contingencies Payment of withholding taxes related to net share settlement of equity awards Share-based Payment Arrangement, Decrease for Tax Withholding Obligation Share-based compensation, vesting period Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 2026 and thereafter Lessee, Operating Lease, Liability, to be Paid, after Year Five Furniture and fixtures Furniture and Fixtures [Member] Entity Address, State or Province Entity Address, State or Province Vested (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Income tax (benefit) provision at statutory federal rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Accounts payable Accounts Payable, Current Internal-Use Software Internal Use Software, Policy [Policy Text Block] Accumulated deficit Retained Earnings (Accumulated Deficit) Operating lease, right of use asset, net Operating Lease, Right-of-Use Asset Unamortized discount Debt Instrument, Unamortized Discount Loss on extinguishment of debt Gain (Loss) on Extinguishment of Debt Cash paid for income taxes Income Taxes Paid Major Customers [Axis] Customer [Axis] Credit concentration risk Credit Concentration Risk [Member] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Income Taxes Income Tax, Policy [Policy Text Block] Shares outstanding, exercisable (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Fees paid for repurchase and exchange of convertible notes due 2023 Payment for Debt Extinguishment or Debt Prepayment Cost Liability Class [Axis] Liability Class [Axis] Stock-based compensation APIC, Share-based Payment Arrangement, Increase for Cost Recognition Canceled (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period Net revenues Net revenues Revenue from Contract with Customer, Excluding Assessed Tax Gain Contingencies, Nature [Axis] Gain Contingencies, Nature [Axis] Share price (in usd per share) Share Price Business Acquisition [Axis] Business Acquisition [Axis] Geographical [Domain] Geographical [Domain] Conversion ratio Debt Instrument, Convertible, Conversion Ratio Issuance of common stock related to acquisition (shares) Stock Issued During Period, Shares, Acquisitions 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 Foreign Deferred Foreign Income Tax Expense (Benefit) Forecast Forecast [Member] Deferred income taxes Increase (Decrease) in Deferred Income Taxes Thurman John Rodgers Thurman John Rodgers [Member] Thurman John Rodgers [Member] Net income (loss) per share: Earnings Per Share, Basic and Diluted [Abstract] Entity Voluntary Filers Entity Voluntary Filers Tax Credit Carryforward [Axis] Tax Credit Carryforward [Axis] Notes due Convertible Debt Securities [Member] SunPower’s SunPower’s [Member] SunPower’s [Member] Credit Facility [Axis] Credit Facility [Axis] Conversion of convertible notes due 2023, net Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature Business Combinations [Abstract] Business Combinations [Abstract] Restructuring and Related Activities [Abstract] Restructuring and Related Activities [Abstract] 2006 Equity Incentive Plan Two Thousand Six Equity Incentive Plan [Member] Two thousand six equity incentive plan. Gain Contingency, Nature [Domain] Gain Contingency, Nature [Domain] Conversion shares (in shares) Debt Instrument, Convertible, Conversion Shares Debt Instrument, Convertible, Conversion Shares Exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Capitalized contract cost, amortization period Capitalized Contract Cost, Amortization Period Proceeds from issuance of common stock, net of issuance costs Proceeds from issuance of common stock Proceeds from Issuance of Common Stock Period One Debt Instrument, Redemption, Period One [Member] Schedule of Computation of Basic and Diluted Net Income Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Limitation for trade or transfer, period Business Combination, Limitation For Trade Or Transfer, Period Business Combination, Limitation For Trade Or Transfer, Period Research and Development Costs Research and Development Expense, Policy [Policy Text Block] Summary of fair values of assets acquired and liabilities assumed Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Fair Value Measurement Fair Value Measurement, Policy [Policy Text Block] Net cash provided by operating activities Cash purchase price allocated in cash flows from investing activities Net Cash Provided by (Used in) Operating Activities Entity Central Index Key Entity Central Index Key Notes due (in shares) Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities Line of credit Line of Credit Facility, Current Borrowing Capacity Related Party Transaction [Line Items] Related Party Transaction [Line Items] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Geographical [Axis] Geographical [Axis] Change in valuation allowance Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount Increase Contract With Customer, Asset, New Contract Additions Contract With Customer, Asset, New Contract Additions Contract Liabilities Change In Contract With Customer, Liability [Roll Forward] Change In Contract With Customer, Liability [Roll Forward] Adjusted net income (loss) Net Income (Loss) Attributable to Parent, Diluted Warrants liability, change in fair value Fair Value Adjustment of Warrants Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Income Statement Location [Axis] Income Statement Location [Axis] Outstanding Options outstanding - weighted- average remaining life Share-based Payment Arrangement, Option, Exercise Price Range, Outstanding, Weighted Average Remaining Contractual Term Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Customer rebates and sales incentives Accrued Marketing Costs, Current Federal Current Federal Tax Expense (Benefit) Amortization of intangible assets Amortization of Intangible Assets Line of Credit Facility [Table] Line of Credit Facility [Table] Threshold percentage Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger SEGMENT AND GEOGRAPHIC INFORMATION Segment Reporting Disclosure [Text Block] Issuance of common stock, net of offering costs Stock Issued During Period, Value, New Issues Scenario [Axis] Scenario [Axis] Tariff refund receivable Gain Contingency, Tariff Refund Receivable Gain Contingency, Tariff Refund Receivable Debt conversion, issuable (in shares) Debt Conversion, Converted Instrument, Shares Issuable Debt Conversion, Converted Instrument, Shares Issuable Title of 12(b) Security Title of 12(b) Security Schedule of Accrued Liabilities Schedule of Accrued Liabilities [Table Text Block] Net Finite-Lived Intangible Assets, Net Long-lived assets Long-Lived Assets Weighted average grant date fair value (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Convertible note, liability component Convertible Notes Payable Uncertain tax positions Effective Income Tax Rate Reconciliation, Tax Contingency, Foreign, Amount Interest expense Interest expense Interest Expense 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] Research Tax Credit Carryforward Research Tax Credit Carryforward [Member] Depreciation and amortization Depreciation, Depletion and Amortization Second And Third Generations Second And Third Generations [Member] Second And Third Generations Schedule of Provision for Income Taxes Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Unrecognized tax benefits Unrecognized Tax Benefits, Period Increase (Decrease) Product and Service [Axis] Product and Service [Axis] Products delivered at a point in time Transferred at Point in Time [Member] Weighted-average recognition period for unrecognized compensation cost Weighted-average recognition period for unrecognized compensation cost Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Revenue recognized Contract with Customer, Liability, Revenue Recognized Section 301 Tariff Refunds, Accrued Interest Section 301 Tariff Refunds, Accrued Interest [Member] Section 301 Tariff Refunds, Accrued Interest Accruals for warranties issued during period Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Warranties Issued Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Warranties Issued Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Timing of Transfer of Good or Service [Domain] Timing of Transfer of Good or Service [Domain] Sec. 163(j) interest carryforward Deferred Tax Assets, Interest Carryforward Deferred Tax Assets, Interest Carryforward Debt Instrument [Axis] Debt Instrument [Axis] Summary of consideration transferred for business acquisition Schedule of Business Acquisitions, by Acquisition [Table Text Block] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Schedule of Quarterly Financial Information Quarterly Financial Information [Table Text Block] Contract Assets Change In Contract With Customer, Asset [Roll Forward] Change In Contract With Customer, Asset [Roll Forward] Adjustments to reconcile net income (loss) to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Revenue from Contract with Customer [Abstract] Revenue from Contract with Customer [Abstract] Accrued interest payable unpaid upon exchange of convertible notes due 2023 Accrued Interest Payable Upon Exchange Of Convertible Notes Accrued Interest Payable Upon Exchange Of Convertible Notes Debt issuance costs, allocated to capital Debt Issuance Costs, Allocated to Capital Debt Issuance Costs, Allocated to Capital 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 State taxes, net of federal benefit Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Options exercisable - number of shares exercisable (shares) Share-based Payment Arrangement, Option, Exercise Price Range, Shares Exercisable Research and development Research and development Research and Development Expense Subsequent Event Subsequent Event [Member] Domestic Tax Authority Domestic Tax Authority [Member] Letters of credit outstanding Letters of Credit Outstanding, Amount Concentration Risk Type [Axis] Concentration Risk Type [Axis] Restructuring Plan [Domain] Restructuring Plan [Domain] Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Net Revenues, Largest Customer Net Revenues, Largest Customer [Member] Net Revenues, Largest Customer [Member] Notes due 2023 interest and financing costs, net Interest on Convertible Debt, Net of Tax Contractual interest expense Contractual interest expense Interest Expense, Debt, Excluding Amortization Lease loss reserves (benefit) Lease Loss Reserves And Contract Termination Costs [Member] Lease Loss Reserves And Contract Termination Costs [Member] Operating lease liabilities, noncurrent (Other liabilities) Operating Lease, Liability, Noncurrent Accruals for warranties issued during period Standard Product Warranty Accrual, Increase for Warranties Issued Total purchased intangible assets, Gross, Additions Intangible Assets, Acquired Intangible Assets, Acquired Equity component of convertible notes Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt, Subsequent Adjustments Tax Credit Carryforward [Line Items] Tax Credit Carryforward [Line Items] Current assets: Assets, Current [Abstract] Fair Value, Option, Quantitative Disclosures [Line Items] Fair Value, Option, Quantitative Disclosures [Line Items] Goodwill, Gross Goodwill, Gross Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent Dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Intangible assets Increase (Decrease) in Intangible Assets, Current Documents Incorporated by Reference Documents Incorporated by Reference [Text Block] Schedule of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Failure Rates Failure Rate [Member] Failure Rate City Area Code City Area Code Embedded derivative, change in the fair value Embedded Derivative, Gain (Loss) on Embedded Derivative, Net Income Tax Authority [Axis] Income Tax Authority [Axis] Document Period End Date Document Period End Date Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Change in fair value of derivatives Change in fair value of derivatives Convertible notes hedge, change in the fair value Gain (Loss) on Derivative Instruments, Net, Pretax Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Summary of Revenue Disaggregation Disaggregation of Revenue [Table Text Block] Share-based compensation, increase in number of shares authorized Share-based Compensation Arrangement by Share-based Payment Award, Increase in Number of Shares Authorized, Ratio Share-based Compensation Arrangement by Share-based Payment Award, Increase in Number of Shares Authorized, Ratio Impairment of Long-Lived Assets Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block] Quarterly Financial Information Disclosure [Abstract] Quarterly Financial Information Disclosure [Abstract] Summary of Stock-Based Compensation Associated with Each Type of Award Share-based Payment Arrangement, Cost by Plan [Table Text Block] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Stock-based compensation Share-based Payment Arrangement, Noncash Expense Intangible Assets, Net (Excluding Goodwill) [Abstract] Intangible Assets, Net (Excluding Goodwill) [Abstract] Cover [Abstract] Cover [Abstract] Measurement Input Type [Axis] Measurement Input Type [Axis] Restructuring reserve, accrual adjustment Restructuring Reserve, Accrual Adjustment Deferred tax assets: Deferred Tax Assets, Net of Valuation Allowance, Current Classification [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] Increase due to accretion expense Product Warranty Accrual, Accretion Expense Product Warranty Accrual, Accretion Expense Change in fair value of common stock related to acquisition Adjustments To Additional Paid In Capital, Acquisitions, Change In Fair Value Of Common Stock Adjustments To Additional Paid In Capital, Acquisitions, Change In Fair Value Of Common Stock Cash and Cash Equivalents [Domain] Cash and Cash Equivalents [Domain] Remaining discount amortization period Debt Instrument, Convertible, Remaining Discount Amortization Period Section 162(m) Effective Income Tax Rate Reconciliation, Nondeductible Expense, Excess Compensation, Amount Effective Income Tax Rate Reconciliation, Nondeductible Expense, Excess Compensation, Amount Total carrying amount of debt Long-term Debt Deferred revenues Increase (Decrease) in Contract with Customer, Liability Asset impairment Asset Impairment and Lease Loss Reserve Asset Impairment and Lease Loss Reserve Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Customer relationship Customer relationships Customer Relationships [Member] Award Date [Domain] Award Date [Domain] Equity Components [Axis] Equity Components [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Subtotal Deferred Tax Assets, Gross Employee stock purchase plan, number of interim purchase periods Employee Stock Purchase Plan, Number of Interim Purchase Periods Employee Stock Purchase Plan, Number of Interim Purchase Periods Minimum Minimum [Member] Net assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets First and Second Generation First and Second Generation [Member] First and Second Generation [Member] Award Date [Axis] Award Date [Axis] Long-term contract assets (Other assets) Contract with Customer, Asset, after Allowance for Credit Loss, Noncurrent Entity Interactive Data Current Entity Interactive Data Current Debt converted, settled Debt Conversion, Amount Settled Debt Conversion, Amount Settled U.S. United States UNITED STATES Exercised (in usd per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] SALE OF COMMON STOCK Stockholders' Equity Note Disclosure [Text Block] Components of Deferred Tax Assets and Liabilities [Abstract] Components of Deferred Tax Assets and Liabilities [Abstract] Summary of Stock Option Activity Share-based Payment Arrangement, Option, Activity [Table Text Block] Purchase obligation Purchase Obligation Other Other Country [Member] Other country. $64.17 —– $64.17 Range Five [Member] Range Five [Member] Stock-Based Compensation Share-based Payment Arrangement [Policy Text Block] Foreign Current Foreign Tax Expense (Benefit) Contract asset impairment charges Capitalized Contract Cost, Impairment Loss Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Total deferred tax liabilities Deferred Tax Liabilities, Gross Accounts Receivable, Allowance for Credit Loss [Roll Forward] Accounts Receivable, Allowance for Credit Loss [Roll Forward] Cash Purchase Price Cash consideration Payments To Acquire Business, Total Gross Amount Payments To Acquire Business, Total Gross Amount Aggregate Intrinsic Value Share-based Payment Arrangement, Additional Disclosure [Abstract] Total purchased intangible assets, Gross Intangible Assets, Gross (Excluding Goodwill) Number of reportable segments Number of Reportable Segments Other expense, net Other Nonoperating Income (Expense) [Abstract] Exercise Price Range [Axis] Exercise Price Range [Axis] Effective percentage rate Debt Instrument, Interest Rate, Effective Percentage Research and development Research and Development Expense [Member] Goodwill, impairment loss Goodwill, Impairment Loss Accounts receivable, net of allowances of $462 and $564 at December 31, 2020 and December 31, 2019, respectively Receivables Accounts Receivable, after Allowance for Credit Loss, Current Finished goods Inventory, Finished Goods, Gross Total lease payments Lessee, Operating Lease, Liability, to be Paid Number of threshold trading days Debt Instrument, Convertible, Threshold Trading Days Increased U.S. Tariffs For Products Manufactured In China Increased U.S. Tariffs For Products Manufactured In China [Member] Increased U.S. Tariffs For Products Manufactured In China Restructuring Restructuring Charges [Member] Weighted-Average Fair Value per Share at Grant Date, Expected to vest (in usd per share) Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other than Options, Expected To Vest, Outstanding, Weighted Average Exercise Price Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other than Options, Expected To Vest, Outstanding, Weighted Average Exercise Price Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period [Domain] Foreign Currency Translation Foreign Currency Transactions and Translations Policy [Policy Text Block] Agreement for exclusive supplier rights, period Business Combination, Supply Agreement, Period Business Combination, Supply Agreement, Period Weighted average common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic and Diluted Cash payments Payments for Restructuring Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Convertible Senior Notes Due 2024 Convertible Senior Note Due 2024 [Member] Convertible Senior Note Due 2024 [Member] Document Transition Report Document Transition Report Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Axis] Deferred: Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Numerator: Net Income (Loss) Attributable to Parent [Abstract] Developed Technology And Goodwill Developed technology and goodwill Developed Technology And Goodwill [Member] Developed Technology And Goodwill [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Current: Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Accounts receivable, related parties Accounts Receivable, Related Parties General and administrative General and Administrative Expense [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Changes in estimates Additional warranty expense Standard and Extended Product Warranty Accrual, Increase (Decrease) for Preexisting Warranties Cumulative Effect, Period of Adoption [Axis] Cumulative Effect, Period of Adoption [Axis] Shares outstanding, vested and expected to vest (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number Credit Facility [Domain] Credit Facility [Domain] Debt conversion price (in USD per share) Debt Instrument, Convertible, Conversion Price Expected term Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Entity File Number Entity File Number Weighted average remaining lease term Operating Lease, Weighted Average Remaining Lease Term Additions Finite-lived Intangible Assets Acquired Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] Share-based Payment Arrangement, Option, Exercise Price Range [Line Items] Total stock-based compensation expense Share-based Payment Arrangement, Expense Shares used in per share calculation: Earnings Per Share, Basic and Diluted, Other Disclosures [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Goodwill and Intangible Assets Disclosure [Abstract] Document Annual Report Document Annual Report Exercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Income tax benefit included in the provision for incomes taxes Share-based Payment Arrangement, Expense, Tax Benefit Schedule of Activity in Allowance for Doubtful Accounts Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Subsequent Event [Table] Subsequent Event [Table] Issuance of common stock from exercise of equity awards and employee stock purchase plan (in shares) Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture Schedule of Reconciliation of Total Amounts of Unrecognized Tax Benefits Summary of Income Tax Contingencies [Table Text Block] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Decrease in liability as a result of decreasing the profit element and risk premium input by 100 basis points Warranty Obligations At Fair Value, Decrease In Fair Value Liability, Resulting From One Percentage Point Decrease In Profit Element And Risk Premium Warranty Obligations At Fair Value, Decrease In Fair Value Liability, Resulting From One Percentage Point Decrease In Profit Element And Risk Premium 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 Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Schedule of Revenue by Major Customers, by Reporting Segments [Table] Schedule of Revenue by Major Customers, by Reporting Segments [Table] Unamortized capitalized software costs Capitalized Computer Software, Net Accounts receivable Increase (Decrease) in Accounts Receivable Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Share-based compensation, look-back feature 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. Total liabilities and stockholders’ equity Liabilities and Equity Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax INCOME TAXES Income Tax Disclosure [Text Block] Lapses in statutes of limitations Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations Operating lease costs Operating Lease, Cost General and administrative General and administrative General and Administrative Expense Unremitted foreign earnings Undistributed Earnings of Foreign Subsidiaries Antidilutive securities (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Total Current Income Tax Expense (Benefit) Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Increases in balances related to tax positions taken in current year Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions Intangible assets, estimated useful life Finite-Lived Intangible Asset, Useful Life Equity Component [Domain] Equity Component [Domain] Product warranty, measured at fair value, noncurrent enph_ProductWarrantyAccrualNoncurrentFairValueDisclosure enph_ProductWarrantyAccrualNoncurrentFairValueDisclosure Gross profit Gross Profit Property and equipment, net Property and equipment, net Property, Plant and Equipment, Net Entity Tax Identification Number Entity Tax Identification Number STOCK-BASED COMPENSATION Share-based Payment Arrangement [Text Block] Net income (loss) Net income (loss) Net Income (Loss) Attributable to Parent Convertible note, equity component Debt Instrument, Convertible, Carrying Amount of Equity Component INVENTORY Inventory Disclosure [Text Block] DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] 2011 Equity Incentive Plan Two Thousand and Eleven Equity Incentive Plan [Member] Two thousand and eleven equity incentive plan. Current Fiscal Year End Date Current Fiscal Year End Date Operating expenses: Operating expenses: Operating Expenses [Abstract] Total warranty obligations measured at fair value Warranty obligations for microinverters sold since January 1, 2014 Warranty, Rights and Obligations, Fair Value Option [Member] Intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Recognized in current period Former Gain Contingency, Recognized in Current Period Warrants sold (in shares) Class of Warrant or Right, Number of Securities Called by Warrants or Rights Developed technology, and patents and licensed technology Developed technology Developed Technology Rights [Member] Number of Shares Outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Deferred revenues, noncurrent Long-term contract liabilities (Deferred revenues) Contract with Customer, Liability, Noncurrent Accounts Receivable, Third Largest Customer Accounts Receivable, Third Largest Customer [Member] Accounts Receivable, Third Largest Customer [Member] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Effective Income Tax Rate Reconciliation, Percent [Abstract] Effective Income Tax Rate Reconciliation, Percent [Abstract] Shares of common stock issued (shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Long-Lived Tangible Asset [Domain] Long-Lived Tangible Asset [Domain] Cost of convertible notes hedge related to the convertible notes Adjustments to Additional Paid in Capital, Convertible Bond Hedge Adjustments to Additional Paid in Capital, Convertible Bond Hedge Summary of Property and Equipment Property, Plant and Equipment [Table Text Block] Measurement input Debt Instrument, Measurement Input Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] Issuance of common stock, net of offering costs (shares) Stock Issued During Period, Shares, New Issues Gross Intangible assets Finite-Lived Intangible Assets, Gross Intangible assets with finite lives: Finite-Lived Intangible Assets, Net [Abstract] Increase due to billings Contract With Customer, Liability, Increase From Cash Receipts Contract With Customer, Liability, Increase From Cash Receipts Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Exercise of warrants (shares) Stock Issued During Period, Shares, Conversion of Convertible Securities Money market funds Money Market Funds [Member] Provision for doubtful accounts Net charges to expenses Accounts Receivable, Credit Loss Expense (Reversal) Less accumulated depreciation and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Short-term contract assets (Prepaid expenses and other assets) Contract with Customer, Asset, after Allowance for Credit Loss, Current Vested and expected to vest Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value Product Warranty Liability [Table] Product Warranty Liability [Table] Related Party Transactions [Abstract] Related Party Transactions [Abstract] Fees paid for repurchase and exchange of convertible notes Repayments of Convertible Debt Schedule of Future Minimum Rental Payments for Operating Leases Lessee, Operating Lease, Liability, Maturity [Table Text Block] Basis of Presentation and Consolidation Basis of Accounting, Policy [Policy Text Block] Other permanent items Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Acquisition funded by issuance of common stock Stock Issued Basic (in shares) Weighted Average Number of Shares Outstanding, Basic Annual risk-free rate of return Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Liability due to supply agreements Supply Agreements Liability, Current Supply Agreements Liability, Current Backwards Compatibility Cables Backwards Compatibility Cables [Member] Backwards Compatibility Cables Other Deferred Tax Assets, Deferred Expense Other, Noncurrent Deferred Tax Assets Tax Deferred Expense Other Current Plan Name [Domain] Plan Name [Domain] Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer REVENUE RECOGNITION Revenue from Contract with Customer [Text Block] Summary of Significant Unobservable Inputs used in the Fair Value Measurement of Liabilities Designated as Level 3 Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques [Table Text Block] Lease liabilities arising from obtaining right-of-use assets Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Inventory Inventory, Policy [Policy Text Block] Income tax benefit (provision) Income taxes (benefit) provision Income tax (benefit) provision Income tax benefit (provision) Income Tax Expense (Benefit) Cash, cash equivalents and restricted cash—Beginning of period Cash. cash equivalents and restricted cash—End of period Total cash, cash equivalents, and restricted cash Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Property and Equipment Property, Plant and Equipment, Policy [Policy Text Block] Local Phone Number Local Phone Number Purchase price Payments to Acquire Businesses, Gross Cumulative Effect, Period of Adoption [Domain] Cumulative Effect, Period of Adoption [Domain] Schedule of Amortization Expense Finite-lived Intangible Assets Amortization Expense [Table Text Block] Exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Schedule of Changes in Nonfinancial Liabilities Related to Warrant Obligations Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Exercise price range, upper limit (usd per share) Share-based Payment Arrangement, Option, Exercise Price Range, Upper Range Limit Other Standard And Extended Product Warranty Accrual, Other Period Increase (Decrease) Standard And Extended Product Warranty Accrual, Other Period Increase (Decrease) Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Long-term debt, gross Long-term Debt, Gross Decreases in balances related to tax positions taken in prior years Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions Balance, beginning of period Balance, end of period Contract with Customer, Liability Related Party Transaction [Domain] Related Party Transaction [Domain] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Award Type [Axis] Award Type [Axis] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] 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] Vested Vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Amortization of debt issuance costs Amortization of Debt Issuance Costs International International [Member] International [Member] Outstanding Outstanding Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Nonvested Restricted cash Restricted cash Restricted Cash Accumulated Income (Deficit) Retained Earnings [Member] Issuance of convertible notes, net of issuance costs Proceeds from Convertible Debt, Net of Issuance Costs Proceeds from Convertible Debt, Net of Issuance Costs SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] Net cash used in investing activities Cash purchase price allocated in cash flows from operating activities Net Cash Provided by (Used in) Investing Activities Purchase of investment in private company Payments to acquire investments Payments to Acquire Investments Share-based compensation, weighted-average remaining contractual term Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Award Type [Domain] Award Type [Domain] Award Type [Domain] Decrease in liability as a result of increasing the discount rate by 100 basis points 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 Long-term liabilities: Liabilities, Noncurrent [Abstract] Schedule of Restructuring Reserve by Type of Cost Schedule of Restructuring Reserve by Type of Cost [Table Text Block] PROPERTY AND EQUIPMENT, NET Property, Plant and Equipment Disclosure [Text Block] NET INCOME (LOSS) PER SHARE Earnings Per Share [Text Block] Current liabilities: Liabilities, Current [Abstract] Monitoring Hardware And Service Monitoring Hardware And Service [Member] Monitoring Hardware And Service [Member] Weighted-average exercise price, vested and expected (in usd per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price Recently Issued Accounting Pronouncements Not Yet Effective and Recently Adopted Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Discount rate Measurement Input, Discount Rate [Member] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract]