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Property, Plant and Equipment - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Property, Plant and Equipment [Abstract]        
Depreciation expense $ 274,000 $ 246,000 $ 778,000 $ 766,000