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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Inventory Net [Abstract]    
Raw materials $ 22,006 $ 24,339
Work in process 4,528 6,443
Finished goods 2,365 2,717
Obsolescence allowance (1,770) (990)
Inventory, net $ 27,129 $ 32,509