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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Jun. 30, 2025 | Jan. 31, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Mar. 12, 2021 | Mar. 01, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Investment in debt securities |  |  |  |  |  | $ 6,300,000 | $ 0 |  |  |
Investment in tax equity fund | $ 1,400,000 | $ 1,400,000 | $ 6,900,000 |  |  | 9,752,000 | 0 |  |  |
Deferred tax asset, tax equity fund | $ 6,200,000 |  |  | $ 6,200,000 |  | 6,200,000 |  |  |  |
Other expense |  |  |  | 500,000 |  | 500,000 |  |  |  |
Allowance for credit losses during period |  |  |  | 0 |  | 0 |  |  |  |
Change in discount rate |  |  |  | $ 0 | $ 0 | 5,715,000 | (759,000) |  |  |
Increase in liability as a result of increasing the profit element and risk premium input by 100 basis points |  |  |  |  |  | 1,400,000 |  |  |  |
Decrease in liability as a result of decreasing the profit element and risk premium input by 100 basis points |  |  |  |  |  | 1,400,000 |  |  |  |
Decrease in liability as a result of increasing the discount rate by 100 basis points |  |  |  |  |  | 12,600,000 |  |  |  |
Increase in liability as a result of decreasing the discount rate by 100 basis points |  |  |  |  |  | $ 14,200,000 |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Loan receivables, contractual maturities | 1 year |  |  | 1 year |  | 1 year |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Loan receivables, contractual maturities | 3 years |  |  | 3 years |  | 3 years |  |  |  |
Convertible Notes | Related Party |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Investment in debt securities | $ 6,300,000 |  |  |  |  |  |  |  |  |
Debt instrument face amount | 7,000,000 |  |  | $ 7,000,000 |  | $ 7,000,000 |  |  |  |
Convertible Debt | Convertible Notes | Related Party |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Investment in debt securities | 6,300,000 |  |  |  |  |  |  |  |  |
Debt instrument face amount | 7,000,000 |  |  | 7,000,000 |  | 7,000,000 |  |  |  |
Level 2 | Recurring |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Tax equity fund investment, fair value | 0 |  |  | 0 |  | 0 |  | $ 0 |  |
Level 3 | Recurring |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Tax equity fund investment, fair value | 3,058,000 |  |  | 3,058,000 |  | 3,058,000 |  | $ 0 |  |
Level 3 | Recurring | Warranty obligations for products sold since January 1, 2014 |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Change in discount rate |  |  |  | 0 | $ 0 | 5,715,000 | $ (759,000) |  |  |
Notes due 2028 | Convertible Notes |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  |  |  | $ 575,000,000.0
Notes due 2028 | Level 2 | Recurring | Convertible Notes |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Notes payable fair value | 494,500,000 |  |  | 494,500,000 |  | 494,500,000 |  |  |  |
Notes due 2026 | Convertible Notes |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument face amount |  |  |  |  |  |  |  |  | $ 57,500,000 | $ 575,000,000
Notes due 2026 | Level 2 | Recurring | Convertible Notes |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Notes payable fair value | $ 617,800,000 |  |  | $ 617,800,000 |  | $ 617,800,000 |  |  |  |

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