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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 34,328 $ 27,400
Work-in-process 3,864 3,596
Finished goods 5,252 5,503
Net balance $ 43,444 $ 36,499