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Property, Plant, and Equipment - Components of Property, Plant, and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross $ 5,174 $ 4,886
Accumulated depreciation (3,876) (3,803)
Property, plant and equipment, net 1,298 1,083
Buildings and Land [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross 579 556
Enterprise Hardware and Software [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross 1,744 1,532
Leaseholds [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross 1,705 1,504
Equipment [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross 971 940
Furniture [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross $ 175 $ 354