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Derivatives (Details Textual) (USD $) | 1 Months Ended | 3 Months Ended
--- | --- | ---
Dec. 31, 2014 | Mar. 31, 2015
Derivatives (Textual) |  |  |  |
Expected dividend yield |  | [1] |  | [1]
Warrant [Member] |  |  |  |
Derivatives (Textual) |  |  |  |
Warrants exercised |  |  | 1,021,369 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised / us-gaap_DerivativeByNatureAxis = us-gaap_WarrantMember |
Derivative warrants |  |  | 21,960 atnm_NumberOfDerivativeWarrants / us-gaap_DerivativeByNatureAxis = us-gaap_WarrantMember |
Fair value of warrants |  |  | 48,691 us-gaap_FairValueAdjustmentOfWarrants / us-gaap_DerivativeByNatureAxis = us-gaap_WarrantMember |
[1] | Management determined the dividend yield to be 0% based upon its expectation that it will not pay dividends for the foreseeable future.

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- Definition Number of derivative warrants. + References No definition available. + Details
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- Definition Amount of expense (income) related to adjustment to fair value of warrant liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 25 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6939902&loc=d3e20148-110875 + Details
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- Definition Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Number of non-option equity instruments exercised by participants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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