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Balance Sheet Components - Property and Equipment, Net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Property and Equipment, Net    
Property and equipment, gross $ 5,518 $ 4,918
Less: Accumulated depreciation and amortization (3,364) (3,022)
Property and equipment, net 2,154 1,896
Depreciation expense 700 1,000
Machinery and equipment    
Property and Equipment, Net    
Property and equipment, gross 3,785 3,428
Construction in progress    
Property and Equipment, Net    
Property and equipment, gross 730 879
Computer and office equipment    
Property and Equipment, Net    
Property and equipment, gross 407 310
Leasehold improvements    
Property and Equipment, Net    
Property and equipment, gross 448 272
Furniture and fixtures    
Property and Equipment, Net    
Property and equipment, gross $ 148 $ 29