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Equity-based Compensation - Schedule of Equity-based Compensation Expenses (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Equity-based compensation expense $ 33 $ 102 $ 87 $ 2,821
Research and Development Expense        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Equity-based compensation expense 0 0 0 232
General and Administrative Expense        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Equity-based compensation expense 33 102 87 466
Restructuring charges: expense acceleration        
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]        
Equity-based compensation expense $ 0 $ 0 $ 0 $ 2,123