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Inventories - Summary of Inventories (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Inventory Disclosure [Abstract]    
Raw materials $ 3,541 $ 3,367
Work-in-process 2,494 3,464
Finished products 9,746 9,883
Total inventory $ 15,781 $ 16,714