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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 30,489 $ 27,400
Work-in-process 3,266 3,596
Finished goods 5,204 5,503
Net balance $ 38,959 $ 36,499