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, 2019
Dec. 31, 2018
Property, Plant and Equipment, Gross $ 893 $ 868
Less: Accumulated depreciation and amortization (786) (758)
Property and equipment, net 107 110 [1]
Machinery and equipment [Member]    
Property, Plant and Equipment, Gross 771 746
Tooling [Member]    
Property, Plant and Equipment, Gross 7 7
Computer software [Memebr]    
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, 2018 was derived from the audited consolidated balance sheet as of that date.