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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Inventory Net [Abstract]    
Raw materials $ 19,444 $ 24,339
Work in process 4,290 6,443
Finished goods 2,077 2,717
Obsolescence allowance (1,866) (990)
Inventory, net $ 23,945 $ 32,509