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Components of Inventory (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Components of inventory, net of allowances    
Raw materials $ 3,394 $ 3,627
Work-in-process 1,567 1,379
Finished goods 6,301 7,560
Inventory, net $ 11,262 $ 12,566