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Property, Plant, and Equipment - Components of Property, Plant, and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross $ 4,886 $ 4,638
Accumulated depreciation (3,803) (3,506)
Property, plant and equipment, net 1,083 1,132
Buildings and Land [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross 556 556
Enterprise Hardware and Software [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross 1,532 1,520
Leaseholds [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross 1,504 1,305
Equipment [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross 940 902
Furniture [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross $ 354 $ 355