Borrowings - Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
2025 Convertible Notes \| Convertible Notes
Debt Instrument [Line Items]
Contractual interest expense	$ 1,223		$ 1,223
Amortization of debt discount	115		115
Amortization of debt issuance costs	10		10
Total	1,348		1,348
2021 Convertible Note Payable \| Convertible Notes
Debt Instrument [Line Items]
Contractual interest expense	1,229	$ 1,737	3,072	$ 3,474
Amortization of debt discount	1,315	1,588	3,230	3,119
Amortization of debt issuance costs	127	154	311	302
Total	2,671	3,479	6,613	6,895
DOE Loan Facility \| Line of Credit
Debt Instrument [Line Items]
Contractual interest expense	827		1,635
Amortization of debt issuance costs	581		1,200
Total	1,408		2,835
AFG Convertible Notes \| Convertible Notes \| Related Party
Debt Instrument [Line Items]
Contractual interest expense	1,481	1,154	2,962	2,309
Amortization of debt discount	279	218	558	436
Amortization of debt issuance costs	79	61	158	123
Total	$ 1,839	1,433	$ 3,678	2,868
Senior Secured Term Loan \| Secured Debt \| Nonrelated Party
Debt Instrument [Line Items]
Contractual interest expense		3,174		6,858
Amortization of debt discount		109		224
Amortization of debt issuance costs		963		1,980
Total		$ 4,246		$ 9,062

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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