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Property, Plant and Equipment, Net - Components of Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Property, Plant and Equipment [Abstract]    
Land $ 260 $ 260
Buildings and improvements 7,652 5,015
Office furniture and equipment 4,393 3,705
Tooling and equipment 20,443 13,736
Transportation equipment 539 525
Construction in process 3,239 6,056
Property, plant and equipment, at cost 36,526 29,297
Accumulated depreciation (10,949) (8,405)
Property, plant and equipment, net $ 25,577 $ 20,892