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Borrowings - Schedule of Net Carrying Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Nov. 30, 2025
Nov. 24, 2025
Jun. 13, 2025
Jun. 11, 2025
Jun. 03, 2025
Dec. 31, 2024
Debt Instrument              
Principal $ 939,476           $ 395,535
Total borrowings 813,266           316,896
2021 Convertible Notes Payable | Convertible Notes              
Debt Instrument              
Principal 0           122,868
Unamortized debt discount 0           (13,045)
Unamortized debt issuance costs 0           (1,257)
Embedded conversion feature 0           1,272
Total borrowings 0           109,838
DOE Loan Facility              
Debt Instrument              
Total borrowings 84,327           65,452
DOE Loan Facility | PIK interest              
Debt Instrument              
Principal 90,945           68,279
Capitalized PIK Interest 3,740           107
Unamortized debt discount (7,609)           0
Unamortized debt issuance costs (2,749)           (2,934)
Total borrowings 84,327           65,452
AFG Convertible Note | Convertible Notes | Related Party              
Debt Instrument              
Principal 0           22,353
Unamortized debt discount 0           (1,906)
Unamortized debt issuance costs 0           (538)
Embedded conversion feature 0           43,124
Total borrowings 0           63,033
2025 Convertible Notes Due | Convertible Notes              
Debt Instrument              
Principal 50,000 $ 250,000     $ 237,500 $ 225,000  
Unamortized debt discount (1,799)     $ (10,000) (9,500) (9,000)  
Unamortized debt issuance costs (157)     (874) (874) (874)  
Total borrowings 48,044     $ 239,126 $ 227,126 $ 215,126  
November 2025 Convertible Notes | Convertible Notes              
Debt Instrument              
Principal 600,000   $ 600,000        
Unamortized debt discount (298,297)   (301,554)        
Unamortized debt issuance costs (326)   (330)        
Total borrowings 530,096   580,170        
November 2025 Convertible Notes | Convertible Notes | Related Party              
Debt Instrument              
Embedded conversion feature 228,719   $ 282,054        
Senior Secured Term Loan              
Debt Instrument              
Total borrowings 0           0
Senior Secured Term Loan | Secured Debt              
Debt Instrument              
Principal 50,000           0
Total borrowings $ 48,044           $ 0