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Other Assets, Net (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]    
Less accumulated amortization $ (5,044)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization $ (5,036)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Intangible assets, net 931us-gaap_FiniteLivedIntangibleAssetsNet 939us-gaap_FiniteLivedIntangibleAssetsNet
Inventory, non-current 447us-gaap_InventoryNoncurrent 460us-gaap_InventoryNoncurrent
Other assets 2,466us-gaap_OtherAssets 2,494us-gaap_OtherAssets
Intangible and other assets 3,844aria_IntangibleAssetsAndOtherAssetsNoncurrent 3,893aria_IntangibleAssetsAndOtherAssetsNoncurrent
Capitalized patent and license costs    
Finite-Lived Intangible Assets [Line Items]    
Intangible assets, gross $ 5,975us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= aria_PatentsAndLicensingRightsMember
$ 5,975us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= aria_PatentsAndLicensingRightsMember