WARRANTY OBLIGATIONS - Narrative (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Product Warranty Liability [Line Items] | ||||
| Change in estimates, increase (decrease) | $ (1,429) | $ 707 | $ (9,134) | $ 13,937 |
| Change In Replacement Costs | ||||
| Product Warranty Liability [Line Items] | ||||
| Change in estimates, increase (decrease) | $ (1,400) | |||
| Product Replacement Costs Related to Battery | ||||
| Product Warranty Liability [Line Items] | ||||
| Change in estimates, increase (decrease) | 7,600 | |||
| Enphase IQ Battery Storage System | ||||
| Product Warranty Liability [Line Items] | ||||
| Change in estimates, increase (decrease) | $ (6,900) | (6,900) | ||
| Product Replacement Costs To Tariff Costs | ||||
| Product Warranty Liability [Line Items] | ||||
| Change in estimates, increase (decrease) | 15,300 | |||
| Field Performance Data And Diagnostic Root-Cause Failure Analysis To Other Products | ||||
| Product Warranty Liability [Line Items] | ||||
| Change in estimates, increase (decrease) | $ 5,500 | |||