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Selected Balance Sheet Components - Property and Equipment (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:          
Total property and equipment, gross $ 12,419   $ 12,419   $ 10,692
Less: Accumulated depreciation (7,212)   (7,212)   (6,621)
Total, net 5,207   5,207   4,071
Depreciation and amortization 300 $ 400 1,100 $ 1,200  
Machinery and equipment          
Property and equipment, net:          
Total property and equipment, gross 1,424   1,424   1,249
Furniture, fixtures and office equipment          
Property and equipment, net:          
Total property and equipment, gross 757   757   872
Computer equipment and software          
Property and equipment, net:          
Total property and equipment, gross 3,695   3,695   3,536
Leasehold improvements          
Property and equipment, net:          
Total property and equipment, gross 4,459   4,459   4,213
Construction in process          
Property and equipment, net:          
Total property and equipment, gross $ 2,084   $ 2,084   $ 822