Balance Sheets Details - Property and Equipment, net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property and equipment	$ 60,253		$ 57,227
Less: accumulated depreciation and amortization	(36,779)		(35,882)
Property and equipment, net	23,474		21,345
Depreciation expense	1,215	$ 659
Laboratory equipment
Property, Plant and Equipment [Line Items]
Property and equipment	36,435		33,101
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment	16,506		16,117
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment	3,565		3,481
Office equipment and furniture
Property, Plant and Equipment [Line Items]
Property and equipment	1,297		1,297
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment	$ 2,450		$ 3,231