Balance Sheet Items - Summary of Prepaid and Other Current Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Prepaid Expense and Other Assets, Current [Abstract]
Prepaid insurance	$ 3,339	$ 2,099
Prepaid research and development expenses	3,461	1,945
Other prepaid expenses and other assets	839	1,015
Total prepaid expenses and other current assets	$ 7,639	$ 5,059