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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Inventory Disclosure [Abstract]    
Raw materials $ 16,257 $ 18,252
Work-in-process 2,879 3,339
Finished goods 4,306 4,737
Net balance $ 23,442 $ 26,328