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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Inventory, Net [Abstract]    
Raw materials $ 18,872 $ 18,848
Work in process 2,342 2,644
Finished goods 2,361 2,492
Obsolescence allowance (823) (568)
Inventory, net $ 22,752 $ 23,416