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Composition of Certain Financial Statement Captions - Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property and Equipment, net [Abstract]    
Manufacturing and development equipment $ 4,507 $ 4,256
Office and computer equipment 1,805 1,953
Leasehold improvements 5,087 3,399
Property and equipment, gross 11,399 9,608
Less accumulated depreciation (8,347) (8,451)
Property and equipment, net $ 3,052 $ 1,157