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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Inventory Net [Abstract]    
Raw materials $ 24,339 $ 18,848
Work in process 6,443 2,644
Finished goods 2,717 2,492
Obsolescence allowance (990) (568)
Inventory, net $ 32,509 $ 23,416