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Inventories - Schedule of Inventories (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 8,359 $ 8,463
Work-in-process 10,442 13,478
Finished products 60,327 54,906
Inventories $ 79,128 $ 76,847