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Equity (Details Textual) (USD $) | 1 Months Ended | 3 Months Ended | 0 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Mar. 31, 2015 | Mar. 31, 2014 | Mar. 09, 2015 | Feb. 18, 2015 | Dec. 31, 2014 | Feb. 11, 2015 | Feb. 18, 2015 | Dec. 31, 2013 | May 08, 2015
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of warrants |  |  |  |  |  |  |  |  | $ 6.50 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 |  |  |
Proceeds from the sale of common stock |  |  | $ 18,484,998 us-gaap_ProceedsFromIssuanceOfCommonStock |  | $ 2,871,477 us-gaap_ProceedsFromIssuanceOfCommonStock |  |  |  |  |  |  |
Warrants to purchase common stock expected to vest, shares |  |  | 75,000 atnm_WarrantsToPurchaseCommonStockExpectedToVest |  |  |  |  |  |  |  |  |
Fair value assumptions, expected term | 3 years |  | 2 years 9 months |  |  |  |  |  |  |  |  |
Fair value assumptions, expected volatility rate | 71.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate | [1] | 72.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate | [1] |  |  |  |  |  |  |  |
Fair value assumptions, expected dividend rate |  | [2] |  | [2] |  |  |  |  |  |  |  |
Unrecognized compensation expense |  |  | 10,800,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |  |  |  |  |  |  |  |  |
Stock-based compensation expense |  |  | 2,908,167 us-gaap_ShareBasedCompensation |  | 1,750,926 us-gaap_ShareBasedCompensation |  |  |  |  |  |  |
Expense related to common stock granted |  |  | 1,000,000 us-gaap_AllocatedShareBasedCompensationExpense |  | 300,000 us-gaap_AllocatedShareBasedCompensationExpense |  |  |  |  |  |  |
Underwriting agreement, description |  |  | In addition, the Company granted the underwriters a 30-day option to purchase up to an additional 666,666 shares of common stock and warrants to purchase 499,999 shares of common stock solely to cover over-allotments, if any. The underwriter did not exercise the over-allotment option. |  |  |  |  |  |  |  |  |
Restricted shares issued |  |  | 203,412 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross |  |  |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation vesting period |  |  |  |  |  | 10 years | 10 years |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation vesting period |  |  |  |  |  | 4 years | 4 years |  |  |  |  |
Consultant [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |
Fair value assumptions, expected term |  |  |  |  |  |  |  | 10 years |  |  |  |
Warrants [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |
Underwritten offering common stock, Shares |  |  |  |  |  |  |  |  | 4,444,444 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_WarrantMember |  |  |
Underwriting discount |  |  |  |  |  |  |  |  | 3,333,333 atnm_UnderwritingDiscount / us-gaap_StatementClassOfStockAxis = us-gaap_WarrantMember |  |  |
Exercise price of warrants |  |  |  |  |  |  |  |  | $ 4.50 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_StatementClassOfStockAxis = us-gaap_WarrantMember |  |  |
Term of warrants |  |  |  |  |  |  |  |  | 4 years |  |  |
Stock-based compensation expense |  |  | 56,516 us-gaap_ShareBasedCompensation / us-gaap_StatementClassOfStockAxis = us-gaap_WarrantMember |  | 58,934 us-gaap_ShareBasedCompensation / us-gaap_StatementClassOfStockAxis = us-gaap_WarrantMember |  |  |  |  |  |  |
Warrants exercised by warrant holders |  |  | 1,080,843 atnm_WarrantsExercisedByWarrantHolders / us-gaap_StatementClassOfStockAxis = us-gaap_WarrantMember |  |  |  |  |  |  |  |  |
Cashless exercise of warrants |  |  | 1,085,618 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementClassOfStockAxis = us-gaap_WarrantMember |  |  |  |  |  |  |  |  |
Fair value of warrants |  |  |  |  |  |  |  |  | 3,540,659 us-gaap_FairValueAdjustmentOfWarrants / us-gaap_StatementClassOfStockAxis = us-gaap_WarrantMember |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock granted value |  |  | 239,662 us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures / us-gaap_StatementClassOfStockAxis = us-gaap_RestrictedStockMember |  |  |  |  |  |  |  |  |
Number of additional stock option granted |  |  | 1,237,250 atnm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalGrantsInPeriod / us-gaap_StatementClassOfStockAxis = us-gaap_RestrictedStockMember |  |  |  |  |  |  |  |  |
Warrants to purchase common stock expected to vest, shares |  |  | 164,662 atnm_WarrantsToPurchaseCommonStockExpectedToVest / us-gaap_StatementClassOfStockAxis = us-gaap_RestrictedStockMember |  |  |  |  |  |  |  |  |
Restricted stock granted remain outstanding |  |  | 238,973 atnm_StockIssuedDuringPeriodRestrictedStockAwardOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_RestrictedStockMember |  |  |  |  |  |  |  |  |
Share-based Compensation vesting period |  |  | 6 months |  |  |  |  |  |  |  |  |
Restricted shares issued |  |  | 239,662 us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross / us-gaap_StatementClassOfStockAxis = us-gaap_RestrictedStockMember |  |  |  |  |  |  |  |  |
Public Offering [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |
Underwritten offering common stock, Shares |  |  |  |  |  |  |  |  | 4,444,444 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_IPOMember |  |  |
Underwriting discount |  |  |  |  |  |  |  |  | 20,000,000 atnm_UnderwritingDiscount / us-gaap_StatementClassOfStockAxis = us-gaap_IPOMember |  |  |
Warrants issued to purchase common stock, shares |  |  | 499,999 atnm_WarrantsIssuedToPurchaseCommonStock / us-gaap_StatementClassOfStockAxis = us-gaap_IPOMember |  |  |  |  |  | 3,333,333 atnm_WarrantsIssuedToPurchaseCommonStock / us-gaap_StatementClassOfStockAxis = us-gaap_IPOMember |  |  |
Exercise price of warrants |  |  |  |  |  |  |  |  | $ 4.50 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_StatementClassOfStockAxis = us-gaap_IPOMember |  |  | $ 6.50 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 / us-gaap_StatementClassOfStockAxis = us-gaap_IPOMember
Term of warrants |  |  | 4 years |  |  |  |  |  |  |  |  |
Warrants/ Common stock granted |  |  | 666,666 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_StatementClassOfStockAxis = us-gaap_IPOMember |  |  |  |  |  |  |  |  |
Cashless exercise of warrants |  |  | 1,085,618 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementClassOfStockAxis = us-gaap_IPOMember |  |  |  |  |  |  |  |  |
Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |
Number of stock option granted |  |  | 536,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  |  |  |  |  |
Fair value of warrants determined utilizing the Black-Scholes option pricing model |  |  |  |  |  |  |  |  |  |  |  |
Fair value assumptions, expected discount rate |  |  |  |  |  | 1.83%atnm_FairValueAssumptionsExpectedDiscountRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  | 1.69%atnm_FairValueAssumptionsExpectedDiscountRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |
Fair value assumptions, expected term |  |  |  |  |  | 6 years |  | 6 years |  | 6 years | 6 years |
Fair value assumptions, expected volatility rate |  |  |  |  |  | 86.29%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  | 86.29%us-gaap_FairValueAssumptionsExpectedVolatilityRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |
Fair value assumptions, expected dividend rate |  |  |  |  |  | 0.00%us-gaap_FairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | 0.00%us-gaap_FairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | 0.00%us-gaap_FairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember | 0.00%us-gaap_FairValueAssumptionsExpectedDividendRate / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Stock-based compensation expense |  |  | 1,000,000 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  | 159 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | 1,000,000 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | 38,739 us-gaap_ShareBasedCompensation / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |
Aggregate Intrinsic Value | 4,728,842 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | 1,398,935 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |  | 4,728,842 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |
Stock Options [Member] | Director [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |
Number of stock option granted |  |  |  |  |  |  | 531,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |  |  |  |  |
Share-based Compensation vesting period |  |  |  |  |  |  | 4 years |  |  |  |  |
Stock option exercise prices |  |  |  |  |  |  | 3.58 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |  |  | 1,400,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |  |  | 1,400,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |  |
Stock Options [Member] | Employees [Member] |  |  |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |  |  |
Number of stock option granted |  |  |  |  |  | 5,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_TitleOfIndividualAxis = atnm_EmployeesMember |  |  |  |  |  |
Share-based Compensation vesting period |  |  |  |  |  | 4 years |  |  |  |  |  |
Stock option exercise prices |  |  |  |  |  | 2.91 us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_TitleOfIndividualAxis = atnm_EmployeesMember |  |  |  |  |  |
Aggregate Intrinsic Value |  |  |  |  |  | 11,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember / us-gaap_TitleOfIndividualAxis = atnm_EmployeesMember |  |  |  |  |  |
[1] | 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.
[2] | 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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