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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials $ 27,400 $ 18,648
Work-in-process 3,596 3,361
Finished goods 5,503 5,127
Net balance $ 36,499 $ 27,136