Annual report pursuant to Section 13 and 15(d)

Balance Sheet Components - Property and equipment (Details)

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Balance Sheet Components - Property and equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Property and equipment, gross $ 1,120 $ 1,021
Less: Accumulated depreciation and amortization (958) (879)
Property and equipment, net 162 142
Machinery and equipment    
Property and equipment, gross 965 866
Tooling    
Property and equipment, gross 11 11
Computer software    
Property and equipment, gross 89 89
Furniture and fixtures    
Property and equipment, gross 15 15
Leasehold improvements    
Property and equipment, gross $ 40 $ 40