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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Inventory Net [Abstract]    
Raw materials $ 21,381 $ 24,339
Work in process 7,664 6,443
Finished goods 2,720 2,717
Obsolescence allowance (1,201) (990)
Inventory, net $ 30,564 $ 32,509