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
Mar. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment, Gross $ 900 $ 897
Less: Accumulated depreciation and amortization (828) (813)
Property and equipment, net 72 84 [1]
Machinery and equipment [Member]    
Property, Plant and Equipment, Gross 774 771
Tooling [Member]    
Property, Plant and Equipment, Gross 11 11
Computer software [Member]    
Property, Plant and Equipment, Gross 89 89
Furniture and fixtures [Member]    
Property, Plant and Equipment, Gross 15 15
Leasehold improvements [Member]    
Property, Plant and Equipment, Gross $ 11 $ 11
[1] The condensed consolidated balance sheet as of December 31, 2019 was derived from the audited consolidated balance sheet as of that date.