Condensed Consolidated Balance Sheet Components - Property and Equipment, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 69,484	$ 41,484
Less: accumulated depreciation	(7,409)	(5,833)
Total property and equipment, net	62,075	35,651
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	43,032	29,064
Laboratory equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	12,745	10,467
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	9,973	1,159
Production equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,504	0
Other
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 1,230	$ 794