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Inventory (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Disclosure Inventory Net [Abstract]    
Raw materials $ 3,742us-gaap_InventoryRawMaterialsNetOfReserves $ 3,453us-gaap_InventoryRawMaterialsNetOfReserves
Work in process 9,360us-gaap_InventoryWorkInProcessNetOfReserves 7,991us-gaap_InventoryWorkInProcessNetOfReserves
Inventory, net $ 13,102us-gaap_InventoryNet $ 11,444us-gaap_InventoryNet