SEGMENT REPORTING - Schedule of Segment Revenue, Segment Profit or Loss, and Significant Segment Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Revenue	$ 807,832	$ 595,271	$ 608,181
Cost of revenue	(1,730,943)	(1,936,066)	(1,646,086)
Research and development	(1,176,453)	(937,012)	(821,512)
Selling, general and administrative	(900,952)	(797,235)	(734,574)
Restructuring charges	(20,304)	(24,546)	0
Change in fair value of common stock warrant liability	34,150	86,926	1,254,218
Change in fair value of equity securities of a related party	(43,057)	5,999	0
Change in fair value of derivative liabilities associated with redeemable convertible preferred stock (related party)	155,350	0	0
Interest income	213,026	204,274	56,756
Interest expense	(32,923)	(24,915)	(30,596)
Other income (expense), net	(18,469)	(90)	9,532
Provision for income taxes	(1,199)	(1,026)	(379)
Net loss	(2,713,942)	(2,828,420)	(1,304,460)
Reportable Segment
Segment Reporting Information [Line Items]
Revenue	807,832	595,271	608,181
Research and development	(1,176,453)	(937,012)	(821,512)
Selling, general and administrative	(900,952)	(797,235)	(734,574)
Restructuring charges	(20,304)	(24,546)	0
Change in fair value of common stock warrant liability	34,150	86,926	1,254,218
Change in fair value of equity securities of a related party	(43,057)	5,999	0
Change in fair value of derivative liabilities associated with redeemable convertible preferred stock (related party)	155,350	0	0
Interest income	213,026	204,274	56,756
Interest expense	(32,923)	(24,915)	(30,596)
Other income (expense), net	(18,469)	(90)	9,532
Provision for income taxes	(1,199)	(1,026)	(379)
Net loss	(2,713,942)	(2,828,420)	(1,304,460)
Cost of revenue - excluding LCNRV and provision for warranty | Reportable Segment
Segment Reporting Information [Line Items]
Cost of revenue	(993,154)	(935,118)	(1,043,383)
LCNRV | Reportable Segment
Segment Reporting Information [Line Items]
Cost of revenue	(617,446)	(926,898)	(569,479)
Warranty Provision | Reportable Segment
Segment Reporting Information [Line Items]
Cost of revenue	$ (120,343)	$ (74,050)	$ (33,224)