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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials $ 18,612 $ 18,648
Work-in-process 3,800 3,361
Finished goods 5,017 5,127
Net balance $ 27,429 $ 27,136