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Property, Plant, and Equipment - Components of Property, Plant, and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross $ 4,740 $ 4,638
Accumulated depreciation (3,678) (3,506)
Property, plant and equipment, net 1,062 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 1,527 1,520
Leaseholds [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross 1,377 1,305
Equipment [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross 925 902
Furniture [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross $ 355 $ 355