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Inventories - Schedule of Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 46,660 $ 33,927
Work-in-process 4,071 2,114
Finished goods 43,304 31,882
Inventories $ 94,035 $ 67,923