Other Expense (Income), net - Schedule of Other Expense (Income) (Detail) - USD ($) $ in Thousands |
1 Months Ended | 3 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|---|
Sep. 30, 2023 |
Mar. 31, 2026 |
Mar. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Other Income and Expenses [Abstract] | ||||||
| Interest expense | $ 29 | $ 458 | $ 895 | $ 1,144 | $ 1,151 | |
| Interest income | (23) | (5) | (33) | (27) | (252) | |
| Imputed interest expense on 2025 bridge loans | 0 | 25 | 154 | 0 | 0 | |
| Gain on extinguishment of the CFF 2021 award | (1,236) | 0 | 0 | |||
| Gain on extinguishment of accrued interest | (56) | 0 | ||||
| Change in fair value of warrant liabilities | 0 | (376) | (1,593) | |||
| Change in fair value of derivative liabilities | (95) | 0 | 50 | |||
| Gain on sale of fixed assets | (1) | (38) | (288) | |||
| Gain on debt conversion | (154) | 0 | 0 | |||
| Loss on debt extinguishment | 0 | 25 | 436 | |||
| Loss on issuance of common stock | $ 200 | 0 | 0 | 231 | ||
| Other expense | 9 | 9 | 27 | (53) | 31 | |
| Total other expense (income), net | $ (41) | $ 487 | $ (443) | $ 675 | $ (234) | |