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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Raw materials $ 19,652 $ 16,257
Work-in-process 2,991 2,879
Finished goods 3,919 4,306
Net balance $ 26,562 $ 23,442