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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials $ 35,253 $ 36,081
Work in process 24,535 22,644
Finished goods 16,853 8,412
Inventories $ 76,641 $ 67,137