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Inventories - Inventories (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 42,738 $ 33,927
Work-in-process 3,435 2,114
Finished goods 37,109 31,882
Inventories $ 83,282 $ 67,923