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WARRANTY OBLIGATIONS - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) country | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) country
Product Warranty Liability [Line Items] |  |  |  |
Change in estimates, increase (decrease) | $ 707 | $ 4,584 | $ 13,937 | $ (8,052)
Product warranty, product warranty replacements, number of countries | country |  | 9 |  | 9
Microinverter |  |  |  |
Product Warranty Liability [Line Items] |  |  |  |
Product warranty, term |  | 20 years |  | 20 years
Product Replacement Costs Related To Battery |  |  |  |
Product Warranty Liability [Line Items] |  |  |  |
Change in estimates, increase (decrease) | 7,600 |  | 15,300 | $ (15,500)
Enphase IQ Battery Storage System |  |  |  |
Product Warranty Liability [Line Items] |  |  |  |
Change in estimates, increase (decrease) | $ (6,900) |  | (6,900) | (4,400)
Defects In Materials |  |  |  |
Product Warranty Liability [Line Items] |  |  |  |
Change in estimates, increase (decrease) |  | $ 8,400 |  | 10,200
Change In Warranty Period |  |  |  |
Product Warranty Liability [Line Items] |  |  |  |
Change in estimates, increase (decrease) |  | 500 |  | 500
Product Replacement Costs Related To IQ Battery |  |  |  |
Product Warranty Liability [Line Items] |  |  |  |
Change in estimates, increase (decrease) |  | $ (4,300) |  |
Field Performance Data and Diagnostic Root-Cause Failure Analysis to Other Products |  |  |  |
Product Warranty Liability [Line Items] |  |  |  |
Change in estimates, increase (decrease) |  |  | $ 5,500 | $ 1,100

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- Definition Amount of increase (decrease) in the standard and extended product warranty accrual from changes in estimates attributable to preexisting product warranties. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (c)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482425/460-10-50-8 + Details
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