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Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Inventory Disclosure [Abstract]    
Raw materials $ 1,573us-gaap_InventoryRawMaterialsNetOfReserves $ 1,555us-gaap_InventoryRawMaterialsNetOfReserves
Work in process 9,789us-gaap_InventoryWorkInProcessNetOfReserves 8,544us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 3,734us-gaap_InventoryFinishedGoodsNetOfReserves 5,235us-gaap_InventoryFinishedGoodsNetOfReserves
Total inventories $ 15,096us-gaap_InventoryNet $ 15,334us-gaap_InventoryNet