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Property, Plant, and Equipment - Components of Property, Plant, and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross $ 5,202 $ 5,174
Accumulated depreciation (4,103) (3,876)
Property, plant and equipment, net 1,099 1,298
Buildings and Land [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross 579 579
Enterprise Hardware and Software [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross 1,743 1,744
Leaseholds [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross 1,702 1,705
Equipment [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross 979 971
Furniture [Member]    
Property Plant And Equipment [Line Items]    
Property, plant and equipment, gross $ 199 $ 175