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Related Party Transactions (Details) - MSKCC [Member]	9 Months Ended
	Sep. 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

X

- 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

X

- 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: