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SEGMENT REPORTING - Schedule of Segment Revenue, Segment Profit or Loss, and Significant Segment Expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Segment Reporting [Line Items]          
Revenue $ 405,347 $ 259,432 $ 687,812 $ 494,480  
Cost of revenue (832,072) (531,783) (1,426,242) (995,343)  
Research and development expenses (321,336) (273,839) (657,006) (525,085)  
Selling, general, and administrative expenses (300,432) (256,857) (604,608) (469,032)  
Workforce reduction charges (33,675) 0 (71,609) 0  
Change in fair value of common stock warrant liability 0 5,322 0 18,183  
Change in fair value of equity securities 549 3,948 (9,672) (9,505)  
Change in fair value of derivative liabilities and subscription agreements associated with redeemable convertible preferred stock (related party) 102,790 111,475 110,165 393,175  
Gain on extinguishment of debt 0 116,360 0 116,360 $ 121,800
Interest income 9,634 44,318 22,738 96,527  
Interest expense (47,817) (23,749) (88,890) (35,632)  
Other income (expense), net (16,789) 3,572 (24,656) 6,537  
Benefit from (provision for) income taxes (1,050) 2,369 (1,227) 3,732  
Net loss (1,034,851) (539,432) (2,063,195) (905,603)  
Reportable Segment          
Segment Reporting [Line Items]          
Revenue 405,347 259,432 687,812 494,480  
Research and development expenses (321,336) (273,839) (657,006) (525,085)  
Selling, general, and administrative expenses (300,432) (256,857) (604,608) (469,032)  
Workforce reduction charges (33,675) 0 (71,609) 0  
Change in fair value of common stock warrant liability 0 5,322 0 18,183  
Change in fair value of equity securities 549 3,948 (9,672) (9,505)  
Change in fair value of derivative liabilities and subscription agreements associated with redeemable convertible preferred stock (related party) 102,790 111,475 110,165 393,175  
Gain on extinguishment of debt 0 116,360 0 116,360  
Interest income 9,634 44,318 22,738 96,527  
Interest expense (47,817) (23,749) (88,890) (35,632)  
Other income (expense), net (16,789) 3,572 (24,656) 6,537  
Benefit from (provision for) income taxes (1,050) 2,369 (1,227) 3,732  
Net loss (1,034,851) (539,432) (2,063,195) (905,603)  
Reportable Segment | Cost of revenue - excluding LCNRV and provision for warranty          
Segment Reporting [Line Items]          
Cost of revenue (514,194) (332,144) (851,400) (631,756)  
Reportable Segment | Cost of revenue - LCNRV          
Segment Reporting [Line Items]          
Cost of revenue (299,706) (184,679) (537,559) (336,315)  
Reportable Segment | Cost of revenue - provision for warranty          
Segment Reporting [Line Items]          
Cost of revenue $ (18,172) $ (14,960) $ (37,283) $ (27,272)