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Inventory Valued at Lower of Cost (First-in, First-out) or Net Realizable Value, Net of Inventory Obsolescence Reserve (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Inventory [Line Items]    
Raw materials $ 5,729 $ 5,204
Finished goods 74,415 70,231
Inventory, net $ 80,144 $ 75,435