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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Inventories    
Finished goods $ 6,972 $ 11,728
Work-in-process 6,828 7,297
Raw materials 16,991 15,562
Less: Inventory reserves (6,191) (6,700)
Inventories, net $ 24,600 $ 27,887