Prepaid Expenses, Other Current Assets and Other Noncurrent Assets - Summary of Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Prepaid Expense and Other Assets, Current [Abstract]
Payroll tax credit	$ 563	$ 755
Prepaid external research and development	1,572	1,834
Prepaid expenses	529	427
Other	67	83
Total prepaid expenses and other current assets	$ 2,731	$ 3,099