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Property and Equipment, Net (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Property and Equipment, Net [Abstract]      
Property and equipment, gross $ 47,521   $ 47,398
Less: accumulated depreciation and amortization (35,927)   (35,191)
Total property and equipment, net 11,594   12,207
Property Plant and Equipment Income Statement Disclosures [Abstract]      
Depreciation and amortization 736 $ 940  
Machinery [Member]      
Property and Equipment, Net [Abstract]      
Property and equipment, gross $ 20,905   20,681
Machinery [Member] | Minimum [Member]      
Property and Equipment, Net [Abstract]      
Useful lives 3 years    
Machinery [Member] | Maximum [Member]      
Property and Equipment, Net [Abstract]      
Useful lives 15 years    
Furniture and Fixtures [Member]      
Property and Equipment, Net [Abstract]      
Property and equipment, gross $ 1,150   1,150
Furniture and Fixtures [Member] | Minimum [Member]      
Property and Equipment, Net [Abstract]      
Useful lives 3 years    
Furniture and Fixtures [Member] | Maximum [Member]      
Property and Equipment, Net [Abstract]      
Useful lives 15 years    
Leasehold Improvements [Member]      
Property and Equipment, Net [Abstract]      
Property and equipment, gross [1] $ 21,333   21,333
Computer, Network Equipment and Software [Member]      
Property and Equipment, Net [Abstract]      
Property and equipment, gross $ 2,657   2,579
Computer, Network Equipment and Software [Member] | Minimum [Member]      
Property and Equipment, Net [Abstract]      
Useful lives 3 years    
Computer, Network Equipment and Software [Member] | Maximum [Member]      
Property and Equipment, Net [Abstract]      
Useful lives 7 years    
Construction in Progress [Member]      
Property and Equipment, Net [Abstract]      
Property and equipment, gross $ 1,476   $ 1,655
[1] Leasehold improvements are amortized over the shorter of the lease term or their estimated useful lives.