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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jan. 31, 2025	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in tax equity fund	$ 1,400	$ 6,900			$ 8,344	$ 0
Deferred tax asset, tax equity fund	6,600		$ 6,600		6,600
Other income (expense), net			100		100
Change in discount rate			5,715	$ (759)	5,715	(759)
Increase in liability as a result of increasing the profit element and risk premium input by 100 basis points					1,300
Decrease in liability as a result of decreasing the profit element and risk premium input by 100 basis points					1,300
Decrease in liability as a result of increasing the discount rate by 100 basis points					12,000
Increase in liability as a result of decreasing the discount rate by 100 basis points					13,500
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 2 | Recurring | Convertible Notes | Notes due 2028
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable fair value	470,100		470,100		470,100
Level 2 | Recurring | Convertible Notes | Notes due 2026
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable fair value	602,100		602,100		602,100
Level 3 | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Tax equity fund investment, fair value	$ 1,698		1,698		1,698		$ 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			$ 5,715	$ (759)	$ 5,715	$ (759)

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