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Balance Sheet Components - Schedule of Components of Property and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 129 $ 2,309
Less: accumulated depreciation and amortization (92) (1,449)
Total property and equipment, net 37 860
Computer Hardware and Software    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 61 146
Machinery and Equipment    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 41 1,698
Furniture and Fixtures    
Property Plant And Equipment [Line Items]    
Property and equipment, gross 9 36
Leasehold Improvements    
Property Plant And Equipment [Line Items]    
Property and equipment, gross $ 18 $ 429