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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Property, plant and equipment
Property, plant and equipment, gross	$ 13,384	$ 14,742
Less: accumulated depreciation and amortization	5,603	6,503
Property, plant and equipment gross, excluding land	7,781	8,239
Land	134	134
Property, plant and equipment, net	7,915	8,373
Buildings and improvements
Property, plant and equipment
Property, plant and equipment, gross	$ 8,083	8,117
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	$ 2,126	2,583
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	$ 118	265
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	$ 2,963	3,349
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	$ 94	$ 428

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
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Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Topic 210
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 13
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