Prepaid Expenses, Other Current Assets and Other Noncurrent Assets - Summary of Prepaid Expenses and Other Noncurrent Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Prepaid Expense and Other Assets, Noncurrent [Abstract]
Deferred transaction costs	$ 0	$ 3,912
Prepaid external research and development—long term	1,084	676
Other	17	23
Total other noncurrent assets	$ 1,101	$ 4,611