Borrowings - Schedule of Net Carrying Value (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Total	$ 395,535	$ 238,962
Total borrowings	316,896	203,859
2021 Convertible Notes Payable | Convertible Notes
Debt Instrument [Line Items]
Total	122,868	115,815
Unamortized debt discount	(13,045)	(19,612)
Unamortized debt issuance costs	(1,257)	(1,895)
Embedded derivative liability	1,272	78
Total borrowings	109,838	94,386
DOE Loan Facility | PIK interest
Debt Instrument [Line Items]
Total	68,279
Capitalized PIK Interest	107
Unamortized debt issuance costs	(2,934)
Total borrowings	65,452
AFG Convertible Notes | Convertible Notes | Related Party
Debt Instrument [Line Items]
Total	22,353	17,429
Unamortized debt discount	(1,906)	(2,835)
Unamortized debt issuance costs	(538)	(800)
Embedded derivative liability	43,124	4,345
Total borrowings	63,033	18,139
Senior Secured Term Loan
Debt Instrument [Line Items]
Total borrowings	0	85,624
Senior Secured Term Loan | Secured Debt
Debt Instrument [Line Items]
Total	0	100,000
Total borrowings	$ 0	85,624
Senior Secured Term Loan | Secured Debt | Nonrelated Party
Debt Instrument [Line Items]
Total		100,000
Unamortized debt discount		(1,459)
Unamortized debt issuance costs		(12,917)
Total borrowings		$ 85,624