Borrowings - Schedule of Interest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
2021 Convertible Notes Payable | Convertible Notes
Debt Instrument [Line Items]
Contractual interest expense	$ 7,053	$ 6,648
Amortization of debt discount	6,608	5,237
Amortization of debt issuance costs	638	508
Total	14,299	12,393
DOE Loan Facility | Equipment financing facility
Debt Instrument [Line Items]
Contractual interest expense	107
Amortization of debt issuance costs	9
Total	116
AFG Convertible Notes | Related Party
Debt Instrument [Line Items]
Total	2,873
AFG Convertible Notes | Convertible Notes | Related Party
Debt Instrument [Line Items]
Contractual interest expense	4,924	3,679
Amortization of debt discount	928	743
Amortization of debt issuance costs	262	209
Total	6,114	4,631
Senior Secured Term Loan | Secured Debt | Nonrelated Party
Debt Instrument [Line Items]
Contractual interest expense	6,858	13,943
Amortization of debt discount	224	407
Amortization of debt issuance costs	1,980	3,601
Total	$ 9,062	$ 17,951