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Inventory Valued at Lower of Cost (First-in, First-out) or Market, Net of Inventory Obsolescence Reserve (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Inventory [Line Items]    
Raw materials $ 1,094 $ 1,596
Finished goods 63,357 56,836
Inventory, net $ 64,451 $ 58,432