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Property, Plant, and Equipment - Components of Property, Plant, and Equipment (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross $ 5,023 $ 4,886
Accumulated depreciation (3,770) (3,803)
Property, plant and equipment, net 1,253 1,083
Buildings and Land [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross 574 556
Enterprise Hardware and Software [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross 1,648 1,532
Leaseholds [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross 1,659 1,504
Equipment [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross 960 940
Furniture [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross $ 182 $ 354