XML 22 R48.htm IDEA: XBRL DOCUMENT v2.4.1.9
Intangible and Other Assets, Net - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Finite-Lived Intangible Liabilities [Line Items]      
Finite lived intangible assets, amortization expense $ 29,000us-gaap_AmortizationOfIntangibleAssets $ 25,000us-gaap_AmortizationOfIntangibleAssets $ 218,000us-gaap_AmortizationOfIntangibleAssets
Finite lived intangible assets, estimated future amortization expense year one 31,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths    
Finite lived intangible assets, estimated future amortization expense year two 31,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo    
Finite lived intangible assets, estimated future amortization expense year three 31,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree    
Finite lived intangible assets, estimated future amortization expense year four 31,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour    
Finite lived intangible assets, estimated future amortization expense year five 31,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive    
Finite lived intangible assets, estimated future amortization expense after year five 241,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive    
Weighted Average      
Finite-Lived Intangible Liabilities [Line Items]      
Finite lived intangible assets, Weighted average amortization period 17 years 17 years 17 years
Capitalized patent and license costs      
Finite-Lived Intangible Liabilities [Line Items]      
Impairment of the carrying value of intangible asset     5,200,000us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= aria_PatentAndLicenseMember
Ridaforolimus, the Company's investigational oral mTOR inhibitor      
Finite-Lived Intangible Liabilities [Line Items]      
Impairment of the carrying value of intangible asset     $ 4,800,000us-gaap_ImpairmentOfIntangibleAssetsFinitelived
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= aria_ClinicalTrialsMember