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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 37,205 $ 37,696
Work-in-process 6,386 4,740
Finished goods 7,998 4,934
Net balance $ 51,589 $ 47,370