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Balance Sheet Components - Summary of Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 3,323 $ 3,267
Less: Accumulated depreciation (1,773) (1,627)
Property and equipment, net 1,550 1,640
Tools and Equipment    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 2,010 2,010
Computer Equipment and Software    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 37 37
Furniture and Fixtures    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 323 323
Leasehold Improvements    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 38 38
Construction In Process    
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 915 $ 859