Prepaid Expenses, Other Current Assets and Other Noncurrent Assets - Summary of Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Prepaid Expense and Other Assets, Current [Abstract]
Payroll tax credit	$ 563	$ 755
Prepaid external research and development	2,901	1,834
Prepaid expenses	1,127	427
Other	229	83
Total prepaid expenses and other current assets	$ 4,820	$ 3,099