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Inventories - Schedule of Inventories (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 7,760 $ 8,463
Work-in-process 10,532 13,478
Finished products 62,701 54,906
Inventories $ 80,993 $ 76,847