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Commitments and Contingencies (Details Textual) (USD $) | 3 Months Ended | 0 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended |  |  |
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Mar. 31, 2015 | Mar. 31, 2014 | Feb. 27, 2014 | Dec. 31, 2014 | Mar. 31, 2015 | Dec. 31, 2007 | Dec. 31, 2012 | Jun. 15, 2012 patients | Aug. 28, 2012 patients | Jun. 20, 2014 | Sep. 30, 2014 | Jul. 31, 2013
Commitments and Contingencies (Textual) |  |  |  |  |  |  |  |  |  |  |  |
Research recorded fees | $ 4,048,714 us-gaap_ResearchAndDevelopmentExpense | $ 1,589,776 us-gaap_ResearchAndDevelopmentExpense |  |  |  |  |  |  |  |  |  |
Total project estimated to cost |  |  |  |  |  |  |  |  |  | 800,000 us-gaap_DevelopmentInProcess |  |
Letter of credit | 34,733 us-gaap_LineOfCredit |  |  |  | 34,733 us-gaap_LineOfCredit |  |  |  |  |  |  |
Amount paid to goodwin | 1,849,000 atnm_AmountPaidToGoodwin | 522,000 atnm_AmountPaidToGoodwin |  |  |  |  |  |  |  |  |  |
Manufacturing Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies (Textual) |  |  |  |  |  |  |  |  |  |  |  |
Project estimated cost for clinical trials of drug Ac-225-HuM195 |  |  | 2,100,000 atnm_ProjectEstimatedCost / atnm_AgreementAxis = atnm_ManufacturingAgreementMember |  |  |  |  |  |  |  |  |
Non - refundable institutional fee |  |  | 562,790 atnm_NonRefundableInstitutionalFee / atnm_AgreementAxis = atnm_ManufacturingAgreementMember |  |  |  |  |  |  |  |  |
Total project estimated to cost |  |  | 3,300,000 us-gaap_DevelopmentInProcess / atnm_AgreementAxis = atnm_ManufacturingAgreementMember |  |  |  |  |  |  |  |  |
Research and development costs | 200,000 us-gaap_ResearchAndDevelopmentInProcess / atnm_AgreementAxis = atnm_ManufacturingAgreementMember |  |  | 100,000 us-gaap_ResearchAndDevelopmentInProcess / atnm_AgreementAxis = atnm_ManufacturingAgreementMember |  |  |  |  |  |  |  |
Einstein [Member] |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies (Textual) |  |  |  |  |  |  |  |  |  |  |  |
Research recorded fees | 55,000 us-gaap_ResearchAndDevelopmentExpense / atnm_AgreementAxis = atnm_AlbertEinsteinMember | 0 us-gaap_ResearchAndDevelopmentExpense / atnm_AgreementAxis = atnm_AlbertEinsteinMember |  |  | 146,713 us-gaap_ResearchAndDevelopmentExpense / atnm_AgreementAxis = atnm_AlbertEinsteinMember |  |  |  |  |  |  |
Total project estimated to cost |  |  |  |  |  |  |  |  |  |  | 183,391 us-gaap_DevelopmentInProcess / atnm_AgreementAxis = atnm_AlbertEinsteinMember |
Abbview Biotherapeutics Corp [Member] | Product Development and Patent License Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies (Textual) |  |  |  |  |  |  |  |  |  |  |  |
License fee payment | 3,000,000 us-gaap_LicenseCosts / atnm_AgreementAxis = atnm_ProductDevelopmentAndPatentLicenseAgreementMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = atnm_AbbviewBiotherapeuticsCorpMember |  |  |  |  |  |  |  |  |  |  |
Milestones payments | 7,750,000 atnm_LongTermPurchaseCommitmentMilestonesPayment / atnm_AgreementAxis = atnm_ProductDevelopmentAndPatentLicenseAgreementMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = atnm_AbbviewBiotherapeuticsCorpMember |  |  |  |  |  |  |  |  |  |  |
Description of royalty payment | The Company shall pay to AbbVie Biotherapeutics Corp. on a country-by-country basis a royalty of 12% of net sales of all licensed products until the later of: (1) 12.5 years after the first commercial sale, or (2) when the patents expire. |  |  |  |  |  |  |  |  |  |  |
Royalty of net sales percentage | 12.00%atnm_RoyaltyOfNetSalesPercentage / atnm_AgreementAxis = atnm_ProductDevelopmentAndPatentLicenseAgreementMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = atnm_AbbviewBiotherapeuticsCorpMember |  |  |  |  |  |  |  |  |  |  |
Abbview Biotherapeutics Corp [Member] | After First Net Sales [Member] |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies (Textual) |  |  |  |  |  |  |  |  |  |  |  |
Milestones payments | 1,500,000 atnm_LongTermPurchaseCommitmentMilestonesPayment / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = atnm_AfterFirstNetSalesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = atnm_AbbviewBiotherapeuticsCorpMember |  |  |  |  |  |  |  |  |  |  |
Abbview Biotherapeutics Corp [Member] | Phase I Clinical Trial of a licensed product [Member] |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies (Textual) |  |  |  |  |  |  |  |  |  |  |  |
Milestones payments | 750,000 atnm_LongTermPurchaseCommitmentMilestonesPayment / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = atnm_PhaseFirstClinicalTrialOfLicensedProductMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = atnm_AbbviewBiotherapeuticsCorpMember |  |  |  |  |  |  |  |  |  |  |
Abbott Biotherapeutics Corp [Member] | After First Net Sales [Member] | Product Development and Patent License Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies (Textual) |  |  |  |  |  |  |  |  |  |  |  |
Net sales in milestones payment | 10,000,000 us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized / atnm_AgreementAxis = atnm_ProductDevelopmentAndPatentLicenseAgreementMember / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = atnm_AfterFirstNetSalesMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = atnm_AbbottBiotherapeuticsCorpMember |  |  |  |  |  |  |  |  |  |  |
Abbott Biotherapeutics Corp [Member] | Phase I Clinical Trial of a licensed product [Member] |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies (Textual) |  |  |  |  |  |  |  |  |  |  |  |
First commercial sale period | 750,000 atnm_FirstCommercialSalePeriod / us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis = atnm_PhaseFirstClinicalTrialOfLicensedProductMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = atnm_AbbottBiotherapeuticsCorpMember |  |  |  |  |  |  |  |  |  |  |
Aptiv Solutions [Member] |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies (Textual) |  |  |  |  |  |  |  |  |  |  |  |
Down payment of project estimated cost percentage | 12.50%atnm_DownPaymentOfProjectEstimatedCostPercentage / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = atnm_AptivSolutionsMember |  |  |  |  |  |  |  |  |  |  |
Down payment for project |  |  |  |  |  | 239,000 atnm_DownPaymentForProject / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = atnm_AptivSolutionsMember | 239,000 atnm_DownPaymentForProject / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = atnm_AptivSolutionsMember |  |  |  |  |
Accrued expenses | 0 us-gaap_AccruedProfessionalFeesCurrentAndNoncurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = atnm_AptivSolutionsMember | 100,000 us-gaap_AccruedProfessionalFeesCurrentAndNoncurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = atnm_AptivSolutionsMember |  |  | 0 us-gaap_AccruedProfessionalFeesCurrentAndNoncurrent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = atnm_AptivSolutionsMember |  |  |  |  |  |  |
Total project estimated to cost | 1,900,000 us-gaap_DevelopmentInProcess / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = atnm_AptivSolutionsMember |  |  |  | 1,900,000 us-gaap_DevelopmentInProcess / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = atnm_AptivSolutionsMember |  |  |  |  |  |  |
Fred Hutchinson Cancer Research Center [Member] | license and sponsored research agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies (Textual) |  |  |  |  |  |  |  |  |  |  |  |
Milestones payments |  |  |  |  |  |  |  | 1,000,000 atnm_LongTermPurchaseCommitmentMilestonesPayment / atnm_AgreementAxis = atnm_LicenseAndSponsoredResearchAgreementMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = atnm_FredHutchinsonCancerResearchCenterMember |  |  |  |
Description of royalty payment |  |  |  |  |  |  |  | Royalty payments of 2% of net sales will be due to FHCRC. |  |  |  |
Fund for Fred Hutchinson Cancer Research Center lab ( Per year for the first two years ) |  |  |  |  |  |  |  | 150,000 atnm_FundToRelatedPartyUnderAgreementForFirstTwoYear / atnm_AgreementAxis = atnm_LicenseAndSponsoredResearchAgreementMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = atnm_FredHutchinsonCancerResearchCenterMember |  |  |  |
Fund for Fred Hutchinson Cancer Research Center lab ( thereafter ) |  |  |  |  |  |  |  | 250,000 atnm_FundToRelatedPartyUnderAgreementAfterYearTwo / atnm_AgreementAxis = atnm_LicenseAndSponsoredResearchAgreementMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = atnm_FredHutchinsonCancerResearchCenterMember |  |  |  |
Number of Patients |  |  |  |  |  |  |  | 2 atnm_NumberOfPatients / atnm_AgreementAxis = atnm_LicenseAndSponsoredResearchAgreementMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = atnm_FredHutchinsonCancerResearchCenterMember |  |  |  |
Accrued expenses | 46,000 us-gaap_AccruedProfessionalFeesCurrentAndNoncurrent / atnm_AgreementAxis = atnm_LicenseAndSponsoredResearchAgreementMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = atnm_FredHutchinsonCancerResearchCenterMember | 37,500 us-gaap_AccruedProfessionalFeesCurrentAndNoncurrent / atnm_AgreementAxis = atnm_LicenseAndSponsoredResearchAgreementMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = atnm_FredHutchinsonCancerResearchCenterMember |  |  | 46,000 us-gaap_AccruedProfessionalFeesCurrentAndNoncurrent / atnm_AgreementAxis = atnm_LicenseAndSponsoredResearchAgreementMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = atnm_FredHutchinsonCancerResearchCenterMember |  |  |  |  |  |  |
Fred Hutchinson Cancer Research Center [Member] | Maximum [Member] | license and sponsored research agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies (Textual) |  |  |  |  |  |  |  |  |  |  |  |
Clinical trial cost for approval of food and drug administration |  |  |  |  |  |  |  | 23,500,000 atnm_ClinicalTrialCostForApprovalForFoodAndDrugAdministration / atnm_AgreementAxis = atnm_LicenseAndSponsoredResearchAgreementMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = atnm_FredHutchinsonCancerResearchCenterMember |  |  |  |
Fred Hutchinson Cancer Research Center [Member] | Minimum [Member] | license and sponsored research agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies (Textual) |  |  |  |  |  |  |  |  |  |  |  |
Clinical trial cost for approval of food and drug administration |  |  |  |  |  |  |  | 13,200,000 atnm_ClinicalTrialCostForApprovalForFoodAndDrugAdministration / atnm_AgreementAxis = atnm_LicenseAndSponsoredResearchAgreementMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = atnm_FredHutchinsonCancerResearchCenterMember |  |  |  |
University of Texas M.D. Anderson Cancer Center [Member] | Clinical Trial Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies (Textual) |  |  |  |  |  |  |  |  |  |  |  |
Number of Patients |  |  |  |  |  |  |  |  | 24 atnm_NumberOfPatients / atnm_AgreementAxis = atnm_ClinicalTrialAgreementMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = atnm_UniversityOfTexasMDAndersonCancerCenterMember |  |  |
Amount paid to each patient after Completing clinical trial |  |  |  |  |  |  |  |  |  |  |  | 34,383 atnm_AmountPaidToEachPatient / atnm_AgreementAxis = atnm_ClinicalTrialAgreementMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = atnm_UniversityOfTexasMDAndersonCancerCenterMember
Start-up fee for clinical trial |  |  |  |  |  |  |  |  | 33,946 atnm_StartUpFeeForClinicalTrial / atnm_AgreementAxis = atnm_ClinicalTrialAgreementMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = atnm_UniversityOfTexasMDAndersonCancerCenterMember |  |  |
Non - refundable institutional fee |  |  |  |  |  |  |  |  | 14,500 atnm_NonRefundableInstitutionalFee / atnm_AgreementAxis = atnm_ClinicalTrialAgreementMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = atnm_UniversityOfTexasMDAndersonCancerCenterMember |  |  |
Total project estimated to cost |  |  |  |  |  |  |  |  | $ 500,000 us-gaap_DevelopmentInProcess / atnm_AgreementAxis = atnm_ClinicalTrialAgreementMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = atnm_UniversityOfTexasMDAndersonCancerCenterMember |  |  |

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