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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Abstract]    
Land $ 1,000
Building 3,361
Machinery and equipment 10,620 10,636
Furniture and fixtures 440 440
Office equipment 2,456 2,401
Building improvements 103 1,458
Property, plant and equipment, gross 13,619 19,296
Less: Accumulated depreciation and amortization (13,227) (16,406)
Property, plant and equipment, net $ 392 $ 2,890