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Balance Sheet Components - Summary of Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 2,337 $ 2,012
Less: Accumulated depreciation (919) (743)
Property and equipment, net 1,418 1,269
Tools and Equipment    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 1,552 1,523
Computer Equipment and Software    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 108 118
Furniture and Fixtures    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 43 43
Leasehold Improvements    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 30 30
Construction In Process    
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 604 $ 298