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v3.7.0.1

Related Party Transactions (Details) - MSKCC [Member] | 6 Months Ended
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Jun. 30, 2017 USD ($)
New Drug Application [Member] |
Summary of milestone payments related to related party |
Milestone payments | $ 750,000
Receipt of Regulatory Approval From U.S. FDA [Member] |
Summary of milestone payments related to related party |
Milestone payments | $ 1,750,000

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- Definition Related party milestone payment. + References No definition available. + Details
Name: | atnm_RelatedPartyMilestonePayment
Namespace Prefix: | atnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionDueFromToRelatedPartyCurrentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=atnm_MemorialSloanKetteringCancerCenterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=atnm_NewDrugApplicationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=atnm_ReceiptOfRegulatoryApprovalFromUSFdaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |