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Property and Equipment, net (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Property and Equipment, Net [Abstract]          
Property and equipment, gross $ 46,654   $ 46,654   $ 45,465
Less: accumulated depreciation and amortization (34,443)   (34,443)   (32,005)
Total property and equipment, net 12,211   12,211   13,460
Property Plant and Equipment Income Statement Disclosures [Abstract]          
Total depreciation and amortization 733 $ 944 2,438 $ 2,797  
Machinery [Member]          
Property and Equipment, Net [Abstract]          
Property and equipment, gross 20,440   $ 20,440   20,056
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 1,142   $ 1,142   1,109
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] 21,314   $ 21,314   21,271
Computer, Network Equipment and Software [Member]          
Property and Equipment, Net [Abstract]          
Property and equipment, gross 2,287   $ 2,287   2,108
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 $ 1,471   $ 1,471   $ 921
[1] Leasehold improvements are amortized over the shorter of the lease term or their estimated useful lives.