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Derivatives (Details 1) (USD $) | 1 Months Ended | 3 Months Ended
--- | --- | ---
Dec. 31, 2014 | Mar. 31, 2015
Summary of fair values of derivative warrants on basis of valuation model |  |  |  |
Market value of common stock on measurement date (1) | $ 5.89 atnm_MarketValueOfCommonStockOnMeasurementDate | [1] | $ 2.47 atnm_MarketValueOfCommonStockOnMeasurementDate | [1]
Adjusted exercise price | $ 2.48 us-gaap_FairValueAssumptionsExercisePrice |  | $ 2.48 us-gaap_FairValueAssumptionsExercisePrice |
Risk free interest rate (2) | 1.10%us-gaap_FairValueAssumptionsRiskFreeInterestRate | [2] | 0.89%us-gaap_FairValueAssumptionsRiskFreeInterestRate | [2]
Warrant lives in years | 3 years |  | 2 years 9 months |
Expected volatility (3) | 71.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate | [3] | 72.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate | [3]
Expected dividend yield (4) |  | [4] |  | [4]
Probability of stock offering in any period over 5 years (5) | 100.00%us-gaap_FairValueInputsProbabilityOfDefault | [5] | 100.00%us-gaap_FairValueInputsProbabilityOfDefault | [5]
Offering price (6) | $ 4.50 atnm_FairValueAssumptionOfferingPrice | [6] | $ 4.50 atnm_FairValueAssumptionOfferingPrice | [6]
[1] | The market value of common stock at the above measurement dates is based on the Company's trading price quoted on the NYSE MKT.
[2] | The risk-free interest rate was determined by management using the Treasury Bill as of the respective measurement date.
[3] | Because the Company does not have adequate trading history to determine its historical trading volatility, the volatility factor was estimated by management using the historical volatilities of comparable companies in the same industry and region.
[4] | Management determined the dividend yield to be 0% based upon its expectation that it will not pay dividends for the foreseeable future.
[5] | Management determines the probability of future stock offering at each evaluation date.
[6] | Represents the estimated offering price in future offerings as determined by management.

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- Definition Agreed upon price for the exchange of the underlying asset. + 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 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 Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock 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 Percentage of likelihood a loan will not be repaid and instead default, used as an input to measure fair value. + 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 (bbb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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