Prepaid Expenses, Other Current Assets - Summary of Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Prepaid Expense and Other Assets, Current [Abstract]
Amounts due under Asset Purchase Agreement	$ 4,837	$ 4,837
Prepaid external research and development	160	528
Prepaid expenses	554	813
Deferred transaction costs	325	0
Payroll tax credit	555	555
Other	20	20
Total prepaid expenses and other current assets	$ 6,451	$ 6,753