Balance Sheet Items - Summary of Prepaid and Other Current Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Prepaid Expense and Other Assets, Current [Abstract]
Prepaid research and development expenses	$ 2,767	$ 2,099
Prepaid insurance	2,459	1,945
Other prepaid expenses and other assets	946	1,015
Total prepaid expenses and other current assets	$ 6,172	$ 5,059