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Related Party Transactions (Details Textual) (USD $) | 6 Months Ended | 0 Months Ended | 3 Months Ended | 12 Months Ended | 0 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 30, 2014 | Dec. 09, 2013 | Mar. 31, 2015 | Dec. 31, 2014 | Feb. 11, 2015
Related Party Transactions (Textual) |  |  |  |  |
Common stock, par value |  |  | $ 0.001 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.001 us-gaap_CommonStockParOrStatedValuePerShare |
Gross proceeds received in Offering | $ 12,525,000 us-gaap_ProceedsFromIssuanceInitialPublicOffering |  |  |  |
Placement agent [Member] |  |  |  |  |
Related Party Transactions (Textual) |  |  |  |  |
Placement agent services fees |  |  |  | 75,000 atnm_PlacementAgentServicesFees / us-gaap_SubsidiarySaleOfStockAxis = atnm_PlacementAgentMember |
Description of receivables of placement agent for services |  | Agreement entered in on December 9, 2013 had similar terms as the 2012 agreement, including a cash fee equal to 10% of the gross proceeds raised, a non-accountable expense reimbursement equal to 2% of the gross proceeds raised and warrants to purchase shares of the Company's Common Stock |  |  |
Description of warrants receivables by placement |  | Warrants to purchase shares of the Company's Common Stock in an amount equal to 10% of the shares of common stock issued or issuable |  |  |
Monthly fee for financial advisory services |  | 25,000 atnm_PeriodicFeeForFinancialAdvisoryServices / us-gaap_SubsidiarySaleOfStockAxis = atnm_PlacementAgentMember |  |  |
Repayment of amount paid to placement agent |  |  | 25,000 us-gaap_RepaymentsOfDebt / us-gaap_SubsidiarySaleOfStockAxis = atnm_PlacementAgentMember | 25,000 us-gaap_RepaymentsOfDebt / us-gaap_SubsidiarySaleOfStockAxis = atnm_PlacementAgentMember |
IPO [Member] |  |  |  |  |
Related Party Transactions (Textual) |  |  |  |  |
Other expenses | 125,000 us-gaap_OtherExpenses / us-gaap_StatementClassOfStockAxis = us-gaap_IPOMember |  |  |  |
Amount paid to placement agent |  |  |  |  | 1,400,000 atnm_AmountPaidToPlacementAgent / us-gaap_StatementClassOfStockAxis = us-gaap_IPOMember
Underwritten offering common stock, Shares |  |  |  |  | 4,444,444 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_IPOMember
Auditor Fees | 72,000 atnm_AuditorFees / us-gaap_StatementClassOfStockAxis = us-gaap_IPOMember |  |  |  |
Common stock, par value | $ 0.001 us-gaap_CommonStockParOrStatedValuePerShare / us-gaap_StatementClassOfStockAxis = us-gaap_IPOMember |  |  |  |
Underwriting discount |  |  |  |  | 20,000,000 atnm_UnderwritingDiscount / us-gaap_StatementClassOfStockAxis = us-gaap_IPOMember
Gross proceeds received in Offering | 11,451,250 us-gaap_ProceedsFromIssuanceInitialPublicOffering / us-gaap_StatementClassOfStockAxis = us-gaap_IPOMember |  |  |  | 18,500,000 us-gaap_ProceedsFromIssuanceInitialPublicOffering / us-gaap_StatementClassOfStockAxis = us-gaap_IPOMember
MSKCC [Member] |  |  |  |  |
Related Party Transactions (Textual) |  |  |  |  |
Maintenance fees |  |  | 145,000 atnm_MaintenanceFeesAndResearchPayments / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = atnm_MemorialSloanKetteringCancerCenterMember | 189,537 atnm_MaintenanceFeesAndResearchPayments / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = atnm_MemorialSloanKetteringCancerCenterMember |
Royalty description |  |  | Under the agreement, the Company shall pay to MSKCC on a country-by-country basis a royalty of 2% of net sales of all licensed products until the later of: (1) 10 years from the first commercial sale, or (2) when the patents expire. |  |
MSKCC [Member] | Clinical Trial Agreement [Member] |  |  |  |  |
Related Party Transactions (Textual) |  |  |  |  |
Maintenance fees |  |  | $ 282,912 atnm_MaintenanceFeesAndResearchPayments / atnm_AgreementAxis = atnm_ClinicalTrialAgreementMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = atnm_MemorialSloanKetteringCancerCenterMember | $ 189,537 atnm_MaintenanceFeesAndResearchPayments / atnm_AgreementAxis = atnm_ClinicalTrialAgreementMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = atnm_MemorialSloanKetteringCancerCenterMember |

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- Definition Description of the commitments made for future artist advances payable and royalty guarantees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 928 -SubTopic 440 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6473578&loc=d3e63223-108013 + Details
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