Stock-based Compensation - Summary of Allocated Stock-based Compensation Expense (Detail) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | |||||
| Stock-based compensation expense | $ 46 | $ 20 | $ 235 | $ 541 | $ 1,965 |
| Research and Development Expense [Member] | |||||
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | |||||
| Stock-based compensation expense | 16 | 15 | 51 | 142 | 691 |
| General and Administrative Expense [Member] | |||||
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | |||||
| Stock-based compensation expense | $ 30 | $ 5 | $ 184 | $ 399 | $ 1,274 |