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Inventories - Schedule of Inventories (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 32,545 $ 42,738
Work-in-process 4,112 3,435
Finished goods 36,232 37,109
Inventories $ 72,889 $ 83,282