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Related Party Transaction - Additional Information (Detail) - Professional Power Products, Inc. [Member] - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Apr. 01, 2014
Related Party Transaction [Line Items]          
Initial term of lease agreement     7 years    
Lease agreement expiration date     Mar. 31, 2021    
Initial lease obligation         $ 480,000
Lease expense $ 120,000 $ 120,000 $ 360,000 $ 240,000