Balance Sheet Components - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property Plant And Equipment [Line Items]
Total property and equipment, gross	$ 91,019	$ 67,732
Less accumulated depreciation and amortization	(11,693)	(5,824)
Total property and equipment, net	79,326	61,908
Leasehold Improvements
Property Plant And Equipment [Line Items]
Total property and equipment, gross	66,618	4,402
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Total property and equipment, gross	745	645
Research Equipment
Property Plant And Equipment [Line Items]
Total property and equipment, gross	14,298	12,900
Computers and Software
Property Plant And Equipment [Line Items]
Total property and equipment, gross	404	130
Construction in Progress
Property Plant And Equipment [Line Items]
Total property and equipment, gross	$ 8,954	$ 49,655