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Fair Value Measurements - Summary of Significant Unobservable Inputs used in the Fair Value Measurements of the Company's Liabilities Designated as Level 3 (Details) (Discounted cash flows, Recurring, Level 3)
 12 Months Ended
Dec. 31, 2014
Warranty obligations for microinverters sold since January 1, 2014  
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]  
Profit element and risk premium 18.00%enph_FairValueInputsProfitElementandRiskPremium
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Credit-adjusted risk-free rate 18.00%us-gaap_FairValueInputsEntityCreditRisk
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Contingent consideration  
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]  
Risk-adjusted discount rate 18.00%us-gaap_FairValueInputsDiscountRate
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