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Composition of Certain Financial Statement Captions - Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Property and Equipment, net [Abstract]    
Manufacturing and development equipment $ 4,256 $ 5,464
Office and computer equipment 1,953 1,939
Leasehold improvements 3,399 3,391
Property and equipment, gross 9,608 10,794
Less accumulated depreciation (8,451) (9,163)
Property and equipment, net $ 1,157 $ 1,631