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Composition of Certain Financial Statement Captions - Property and Equipment, Net (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Property and Equipment, net [Abstract]    
Manufacturing and development equipment $ 3,753 $ 4,507
Office and computer equipment 1,242 1,805
Leasehold improvements 2,535 5,087
Property and equipment, gross 7,530 11,399
Less accumulated depreciation (4,971) (8,347)
Property and equipment, net $ 2,559 $ 3,052