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Selected Balance Sheet Components - Property and Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Property and equipment, net:          
Total property and equipment, gross $ 11,565   $ 11,565   $ 10,692
Less: Accumulated depreciation (6,892)   (6,892)   (6,621)
Total, net 4,673   4,673   4,071
Depreciation and amortization 400 $ 400 800 $ 800  
Machinery and equipment          
Property and equipment, net:          
Total property and equipment, gross 1,212   1,212   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 3,554   3,554   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 $ 1,583   $ 1,583   $ 822