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Balance Sheet Components - Property and Equipment, Net (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Property and Equipment, Net          
Property and equipment, gross $ 5,244   $ 5,244   $ 4,918
Less: Accumulated depreciation and amortization (3,196)   (3,196)   (3,022)
Property and equipment, net 2,048   2,048   1,896
Depreciation expense 200 $ 300 500 $ 800  
Machinery and equipment          
Property and Equipment, Net          
Property and equipment, gross 3,670   3,670   3,428
Construction in progress          
Property and Equipment, Net          
Property and equipment, gross 660   660   879
Computer and office equipment          
Property and Equipment, Net          
Property and equipment, gross 325   325   310
Leasehold improvements          
Property and Equipment, Net          
Property and equipment, gross 443   443   272
Furniture and fixtures          
Property and Equipment, Net          
Property and equipment, gross $ 146   $ 146   $ 29