Balance Sheet Components - Schedule of Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 51,822	$ 46,234
Less accumulated depreciation and amortization	(14,599)	(13,174)
Property and equipment, net	37,223	33,060
Computer equipment and software
Property, Plant and Equipment [Line Items]
Total property and equipment	1,234	1,224
Laboratory equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	14,500	12,778
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property and equipment	1,136	1,136
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	26,696	26,701
Construction in progress
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 8,256	$ 4,395