Quarterly report pursuant to Section 13 or 15(d)

Related Party Transactions (Details)

v2.4.1.9
Related Party Transactions (Details) (Memorial Sloan Kettering Cancer Center [Member], USD $)
3 Months Ended
Mar. 31, 2015
New Drug Application [Member]
 
Summary of milestone payments related to related party  
Milestones payments $ 750,000atnm_RelatedPartyMilestonesPayment
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= atnm_NewDrugApplicationMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= atnm_MemorialSloanKetteringCancerCenterMember
Receipt of Regulatory Approval From U.S. FDA [Member]
 
Summary of milestone payments related to related party  
Milestones payments $ 1,750,000atnm_RelatedPartyMilestonesPayment
/ us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis
= atnm_ReceiptOfRegulatoryApprovalFromUSFdaMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= atnm_MemorialSloanKetteringCancerCenterMember