Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Payables and Accruals [Abstract]
Accrued employee compensation and benefits	$ 6,067	$ 6,592
Accrued external research and development expenses	8,563	3,906
Accrued professional fees	976	571
Accrued deferred financing fees	0	591
Other	578	374
Total accrued expenses	$ 16,184	$ 12,034