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Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Inventory [Line Items]    
Raw materials $ 0us-gaap_InventoryRawMaterialsNetOfReserves $ 0us-gaap_InventoryRawMaterialsNetOfReserves
Work in process 447us-gaap_InventoryWorkInProcessNetOfReserves 460us-gaap_InventoryWorkInProcessNetOfReserves
Finished goods 704us-gaap_InventoryFinishedGoodsNetOfReserves 979us-gaap_InventoryFinishedGoodsNetOfReserves
Total 1,151aria_InventoryCurrentAndNoncurrentNet 1,439aria_InventoryCurrentAndNoncurrentNet
Current portion (704)us-gaap_InventoryNet (979)us-gaap_InventoryNet
Non-current portion included in intangible and other assets, net 447us-gaap_InventoryNoncurrent 460us-gaap_InventoryNoncurrent
Total $ 1,151aria_InventoryCurrentAndNoncurrentNet $ 1,439aria_InventoryCurrentAndNoncurrentNet