Balance Sheet Components - Summary of Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Property Plant And Equipment [Line Items]
Total property and equipment, gross	$ 18,637	$ 3,906
Less: accumulated depreciation	(789)	(1,971)
Total property and equipment, net	17,848	1,935
Leasehold Improvements [Member]
Property Plant And Equipment [Line Items]
Total property and equipment, gross	16,594	3,061
Laboratory Equipment [Member]
Property Plant And Equipment [Line Items]
Total property and equipment, gross	1,353	555
Furniture and Fixtures [Member]
Property Plant And Equipment [Line Items]
Total property and equipment, gross	649	263
Computer Equipment and Software [Member]
Property Plant And Equipment [Line Items]
Total property and equipment, gross	$ 41	$ 27