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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

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