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Components of Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Inventory [Line Items]    
Raw materials $ 10,075us-gaap_InventoryRawMaterialsNetOfReserves $ 4,856us-gaap_InventoryRawMaterialsNetOfReserves
Work-in-process 5,550us-gaap_InventoryWorkInProcessNetOfReserves 4,719us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 1,164us-gaap_InventoryFinishedGoodsNetOfReserves 95us-gaap_InventoryFinishedGoodsNetOfReserves
Total inventories $ 16,789us-gaap_InventoryNet $ 9,670us-gaap_InventoryNet