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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Property, plant and equipment    
Property, plant and equipment, gross $ 13,500 $ 13,238
Less: accumulated depreciation and amortization 6,714 6,074
Property, plant and equipment net, excluding land 6,786 7,164
Land 134 134
Property, plant and equipment, net 6,920 7,298
Buildings and improvements    
Property, plant and equipment    
Property, plant and equipment, gross $ 7,876 7,972
Buildings and improvements | Minimum    
Property, plant and equipment    
Property, plant and equipment, Estimated Useful Lives (years) 15 years  
Buildings and improvements | Maximum    
Property, plant and equipment    
Property, plant and equipment, Estimated Useful Lives (years) 25 years  
Office equipment and furniture    
Property, plant and equipment    
Property, plant and equipment, gross $ 2,194 2,135
Office equipment and furniture | Minimum    
Property, plant and equipment    
Property, plant and equipment, Estimated Useful Lives (years) 2 years  
Office equipment and furniture | Maximum    
Property, plant and equipment    
Property, plant and equipment, Estimated Useful Lives (years) 7 years  
Automobiles and trucks    
Property, plant and equipment    
Property, plant and equipment, gross $ 164 157
Automobiles and trucks | Minimum    
Property, plant and equipment    
Property, plant and equipment, Estimated Useful Lives (years) 2 years  
Automobiles and trucks | Maximum    
Property, plant and equipment    
Property, plant and equipment, Estimated Useful Lives (years) 5 years  
Machinery and shop equipment    
Property, plant and equipment    
Property, plant and equipment, gross $ 3,162 2,951
Machinery and shop equipment | Minimum    
Property, plant and equipment    
Property, plant and equipment, Estimated Useful Lives (years) 2 years  
Machinery and shop equipment | Maximum    
Property, plant and equipment    
Property, plant and equipment, Estimated Useful Lives (years) 10 years  
Construction in Progress    
Property, plant and equipment    
Property, plant and equipment, gross $ 104 $ 23