Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Prepaid research and development services	$ 247	$ 1,535
Prepaid insurance	505	362
Other prepaid expenses	2,813	19
Other receivable		2,876
Other current assets	4	373
Total prepaid expenses and other current assets	$ 3,569	$ 5,165