Quarterly report pursuant to Section 13 or 15(d)

Components of Inventories (Detail)

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Components of Inventories (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Inventory [Line Items]    
Raw materials $ 300 $ 300
Finished goods 28,200 27,100
Total 28,500 27,400
Less: Provision for obsolescence (1,200) (1,200)
Inventories, net $ 27,276 $ 26,164