Balance Sheet Components - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Property Plant And Equipment [Line Items]
Total property and equipment, gross	$ 87,129	$ 67,732
Less accumulated depreciation and amortization	(9,442)	(5,824)
Total property and equipment, net	77,687	61,908
Leasehold Improvements
Property Plant And Equipment [Line Items]
Total property and equipment, gross	66,619	4,402
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Total property and equipment, gross	645	645
Research Equipment
Property Plant And Equipment [Line Items]
Total property and equipment, gross	14,621	12,900
Computers and Software
Property Plant And Equipment [Line Items]
Total property and equipment, gross	130	130
Construction in Progress
Property Plant And Equipment [Line Items]
Total property and equipment, gross	$ 5,114	$ 49,655