Borrowings - Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Debt Instrument
Amortization of debt discount	$ 381	$ 0
2021 Convertible Note Payable \| Convertible Notes
Debt Instrument
Contractual interest expense	0	1,843
Amortization of debt discount	0	1,915
Amortization of debt issuance costs	0	184
Interest Expense, Debt, Total	0	3,942
AFG Convertible Notes \| Convertible Notes \| Related Party
Debt Instrument
Contractual interest expense	0	1,481
Amortization of debt discount	0	279
Amortization of debt issuance costs	0	79
Interest Expense, Debt, Total	0	1,839
May 2025 Convertible Notes \| Convertible Notes
Debt Instrument
Contractual interest expense	844
Amortization of debt discount	74
Amortization of debt issuance costs	6
Interest Expense, Debt, Total	924
November 2025 Convertible Notes \| Convertible Notes
Debt Instrument
Contractual interest expense	2,625
Amortization of debt discount	8,045
Amortization of debt issuance costs	9
Interest Expense, Debt, Total	10,679
DOE Loan Facility \| Line of Credit
Debt Instrument
Contractual interest expense	1,092	808
Amortization of debt issuance costs	141	91
Interest Expense, Debt, Total	$ 1,614	$ 899

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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