Balance Sheet Components - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Property Plant And Equipment [Line Items]
Total property and equipment, gross	$ 92,471	$ 91,019
Less accumulated depreciation and amortization	(13,949)	(11,693)
Total property and equipment, net	78,522	79,326
Leasehold Improvements
Property Plant And Equipment [Line Items]
Total property and equipment, gross	66,618	66,618
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Total property and equipment, gross	746	745
Research Equipment
Property Plant And Equipment [Line Items]
Total property and equipment, gross	15,430	14,298
Computers and Software
Property Plant And Equipment [Line Items]
Total property and equipment, gross	404	404
Construction in Progress
Property Plant And Equipment [Line Items]
Total property and equipment, gross	$ 9,273	$ 8,954