Quarterly report pursuant to Section 13 or 15(d)

Balance Sheet Components - Property and equipment (Details)

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Balance Sheet Components - Property and equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Property and equipment, gross $ 1,057 $ 1,021
Less: Accumulated depreciation and amortization (918) (879)
Property and equipment, net 139 142 [1]
Machinery and equipment [Member]    
Property and equipment, gross 902 866
Tooling [Member]    
Property and equipment, gross 11 11
Computer software [Member]    
Property and equipment, gross 89 89
Furniture and fixtures [Member]    
Property and equipment, gross 15 15
Leasehold improvements [Member]    
Property and equipment, gross $ 40 $ 40
[1] The condensed consolidated balance sheet as of December 31, 2020 was derived from the audited consolidated balance sheet as of that date.