Equity-based Compensation - Schedule of Equity-based Compensation Expenses (Detail) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | ||
| Equity-based compensation expense | $ 10 | $ 25 |
| Research and Development Expense | ||
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | ||
| Equity-based compensation expense | 0 | 0 |
| General and Administrative Expense | ||
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | ||
| Equity-based compensation expense | 10 | 25 |
| Restructuring charges: expense acceleration | ||
| Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | ||
| Equity-based compensation expense | $ 0 | $ 0 |