Property and Equipment, net - Property and Equipment, Net (Detail) - USD ($) $ in Thousands |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|---|---|---|---|
| Property, Plant and Equipment [Line Items] | |||
| Total property and equipment, at cost | $ 0 | $ 0 | $ 313 |
| Less: Accumulated depreciation and amortization | 0 | 0 | (278) |
| Property and equipment, net | 0 | 0 | 35 |
| Computers and software [Member] | |||
| Property, Plant and Equipment [Line Items] | |||
| Total property and equipment, at cost | 0 | 0 | 26 |
| Office furniture and equipment [Member] | |||
| Property, Plant and Equipment [Line Items] | |||
| Total property and equipment, at cost | 0 | 0 | 15 |
| Laboratory equipment [Member] | |||
| Property, Plant and Equipment [Line Items] | |||
| Total property and equipment, at cost | 0 | 0 | 215 |
| Leasehold improvement [Member] | |||
| Property, Plant and Equipment [Line Items] | |||
| Total property and equipment, at cost | $ 0 | $ 0 | $ 57 |