Property and Equipment - Summary of Property and Equipment (Detail) - USD ($) $ in Thousands |
Jun. 30, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Property Plant And Equipment [Line Items] | ||
| Property and equipment, gross | $ 2,621 | $ 2,584 |
| Less: accumulated depreciation and amortization | (2,396) | (2,327) |
| Property and equipment, net | 225 | 257 |
| Machinery and Equipment [Member] | ||
| Property Plant And Equipment [Line Items] | ||
| Property and equipment, gross | 1,687 | 1,662 |
| Computer Equipment and Software [Member] | ||
| Property Plant And Equipment [Line Items] | ||
| Property and equipment, gross | 223 | 221 |
| Office Equipment [Member] | ||
| Property Plant And Equipment [Line Items] | ||
| Property and equipment, gross | 64 | 64 |
| Leasehold Improvements [Member] | ||
| Property Plant And Equipment [Line Items] | ||
| Property and equipment, gross | 635 | 625 |
| Construction in Progress [Member] | ||
| Property Plant And Equipment [Line Items] | ||
| Property and equipment, gross | $ 12 | $ 12 |