Borrowings - Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Debt Instrument
Amortization of debt discount	$ 402	$ 0	$ 783	$ 0
2021 Convertible Note Payable \| Convertible Notes
Debt Instrument
Contractual interest expense	0	1,229	0	3,072
Amortization of debt discount	0	1,315	0	3,230
Amortization of debt issuance costs	0	127	0	311
Total	0	2,671	0	6,613
AFG Convertible Notes \| Convertible Notes \| Related Party
Debt Instrument
Contractual interest expense	0	1,481	0	2,962
Amortization of debt discount	0	279	0	558
Amortization of debt issuance costs	0	79	0	158
Total	0	1,839	0	3,678
May 2025 Convertible Notes \| Convertible Notes
Debt Instrument
Contractual interest expense	844	1,223	1,688	1,223
Amortization of debt discount	85	115	159	115
Amortization of debt issuance costs	7	10	14	10
Total	936	1,348	1,861	1,348
November 2025 Convertible Notes \| Convertible Notes
Debt Instrument
Contractual interest expense	2,625		5,250
Amortization of debt discount	8,455		16,500
Amortization of debt issuance costs	9		18
Total	11,089		21,768
DOE Loan Facility \| Line of Credit
Debt Instrument
Contractual interest expense	1,117	827	2,209	1,635
Amortization of debt issuance costs	147	581	288	1,200
Total	$ 1,666	$ 1,408	$ 3,280	$ 2,835

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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