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Components of Inventory (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Components of inventory, net of allowances    
Raw materials $ 4,742 $ 3,627
Work-in-process 1,651 1,379
Finished goods 7,150 7,560
Inventory, net $ 13,543 $ 12,566