Prepaid Expenses - Additional Information (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Prepaid expenses	$ 2,519	$ 12,076
Prepaid R&D clinical costs	1,481	11,286
Prepaid insurance	369	223
Other prepaid costs	$ 669	$ 567