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Inventory - Components of Inventory (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials $ 44,185 $ 40,461
Work in process 1,939 4,003
Finished goods 76,418 60,653
Total Inventory, net $ 122,542 $ 105,117