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Balance Sheet Components - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Property Plant And Equipment [Line Items]
Depreciation expenses	$ 2,700	$ 2,900	$ 5,400	$ 5,700
Property and equipment, gross	103,055		103,055		$ 102,780
Less: accumulated depreciation	(52,625)		(52,625)		(47,160)
Total property and equipment, net	50,430		50,430		55,620
Leasehold improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 56,257		$ 56,257		56,180
Leasehold improvements \| Minimum
Property Plant And Equipment [Line Items]
Useful life (in years)	8 years		8 years
Leasehold improvements \| Maximum
Property Plant And Equipment [Line Items]
Useful life (in years)	12 years		12 years
Laboratory equipment
Property Plant And Equipment [Line Items]
Useful life (in years)	5 years		5 years
Property and equipment, gross	$ 41,216		$ 41,216		40,961
Furniture and fixtures
Property Plant And Equipment [Line Items]
Useful life (in years)	5 years		5 years
Property and equipment, gross	$ 2,890		$ 2,890		2,836
Computer equipment
Property Plant And Equipment [Line Items]
Useful life (in years)	3 years		3 years
Property and equipment, gross	$ 2,692		$ 2,692		2,689
Construction in progress
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 0		$ 0		$ 114