Balance Sheet Components - Property and Equipment (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 50,429	$ 50,429
Less: accumulated depreciation and amortization	(18,004)	(15,511)
Property and equipment, net	32,425	34,918
Laboratory Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	15,041	14,373
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	2,850	2,841
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	32,281	32,281
Construction-in-Progress [Member]
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 257	$ 934