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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Property, plant and equipment    
Property, plant and equipment, gross $ 6,925 $ 6,387
Less: accumulated depreciation and amortization (6,896) (6,342)
Property, Plant and Equipment, Net 29 45
Leasehold improvements    
Property, plant and equipment    
Property, plant and equipment, gross $ 835 792
Leasehold improvements | Minimum    
Property, plant and equipment    
Lives in years 5 years  
Leasehold improvements | Maximum    
Property, plant and equipment    
Lives in years 15 years  
Research and laboratory equipment    
Property, plant and equipment    
Property, plant and equipment, gross $ 4,854 4,438
Research and laboratory equipment | Minimum    
Property, plant and equipment    
Lives in years 3 years  
Research and laboratory equipment | Maximum    
Property, plant and equipment    
Lives in years 5 years  
Office equipment and furniture    
Property, plant and equipment    
Property, plant and equipment, gross $ 1,236 $ 1,157
Office equipment and furniture | Minimum    
Property, plant and equipment    
Lives in years 3 years  
Office equipment and furniture | Maximum    
Property, plant and equipment    
Lives in years 5 years