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Property, Plant, and Equipment - Components of Property, Plant, and Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross $ 5,226 $ 5,232
Accumulated depreciation (4,365) (4,307)
Property, plant and equipment, net 861 925
Buildings and Land [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross 589 589
Enterprise Hardware and Software [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross $ 1,741 1,742
Property, plant and equipment, estimated useful life 3 years  
Leaseholds [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross $ 1,696 1,701
Property, plant and equipment, estimated useful life Lesser of lease term or estimated useful life  
Equipment [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross $ 1,002 1,002
Property, plant and equipment, estimated useful life 7 years  
Furniture [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross $ 198 $ 198
Property, plant and equipment, estimated useful life 5 years  
Buildings [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, estimated useful life 30 years