Quarterly report pursuant to Section 13 or 15(d)

Equity (Details Textual)

v2.4.1.9
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             $ 6.50us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1      
Proceeds from the sale of common stock   $ 18,484,998us-gaap_ProceedsFromIssuanceOfCommonStock $ 2,871,477us-gaap_ProceedsFromIssuanceOfCommonStock              
Warrants to purchase common stock expected to vest, shares   75,000atnm_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   10,800,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized                
Stock-based compensation expense   2,908,167us-gaap_ShareBasedCompensation 1,750,926us-gaap_ShareBasedCompensation              
Expense related to common stock granted   1,000,000us-gaap_AllocatedShareBasedCompensationExpense 300,000us-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   203,412us-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             4,444,444us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_WarrantMember 		     
Underwriting discount             3,333,333atnm_UnderwritingDiscount
/ us-gaap_StatementClassOfStockAxis
= us-gaap_WarrantMember 		     
Exercise price of warrants             $ 4.50us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementClassOfStockAxis
= us-gaap_WarrantMember 		     
Term of warrants             4 years      
Stock-based compensation expense   56,516us-gaap_ShareBasedCompensation
/ us-gaap_StatementClassOfStockAxis
= us-gaap_WarrantMember 		58,934us-gaap_ShareBasedCompensation
/ us-gaap_StatementClassOfStockAxis
= us-gaap_WarrantMember 		             
Warrants exercised by warrant holders   1,080,843atnm_WarrantsExercisedByWarrantHolders
/ us-gaap_StatementClassOfStockAxis
= us-gaap_WarrantMember 		               
Cashless exercise of warrants   1,085,618us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementClassOfStockAxis
= us-gaap_WarrantMember 		               
Fair value of warrants             3,540,659us-gaap_FairValueAdjustmentOfWarrants
/ us-gaap_StatementClassOfStockAxis
= us-gaap_WarrantMember 		     
Restricted Stock [Member]                    
Equity (Textual)                    
Restricted stock granted value   239,662us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures
/ us-gaap_StatementClassOfStockAxis
= us-gaap_RestrictedStockMember 		               
Number of additional stock option granted   1,237,250atnm_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalGrantsInPeriod
/ us-gaap_StatementClassOfStockAxis
= us-gaap_RestrictedStockMember 		               
Warrants to purchase common stock expected to vest, shares   164,662atnm_WarrantsToPurchaseCommonStockExpectedToVest
/ us-gaap_StatementClassOfStockAxis
= us-gaap_RestrictedStockMember 		               
Restricted stock granted remain outstanding   238,973atnm_StockIssuedDuringPeriodRestrictedStockAwardOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_RestrictedStockMember 		               
Share-based Compensation vesting period   6 months                
Restricted shares issued   239,662us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_StatementClassOfStockAxis
= us-gaap_RestrictedStockMember 		               
Public Offering [Member]                    
Equity (Textual)                    
Underwritten offering common stock, Shares             4,444,444us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_IPOMember 		     
Underwriting discount             20,000,000atnm_UnderwritingDiscount
/ us-gaap_StatementClassOfStockAxis
= us-gaap_IPOMember 		     
Warrants issued to purchase common stock, shares   499,999atnm_WarrantsIssuedToPurchaseCommonStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_IPOMember 		        3,333,333atnm_WarrantsIssuedToPurchaseCommonStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_IPOMember 		     
Exercise price of warrants             $ 4.50us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementClassOfStockAxis
= us-gaap_IPOMember 		    $ 6.50us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementClassOfStockAxis
= us-gaap_IPOMember
Term of warrants   4 years                
Warrants/ Common stock granted   666,666us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_StatementClassOfStockAxis
= us-gaap_IPOMember 		               
Cashless exercise of warrants   1,085,618us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
/ us-gaap_StatementClassOfStockAxis
= us-gaap_IPOMember 		               
Stock Options [Member]                    
Equity (Textual)                    
Number of stock option granted   536,000us-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   1,000,000us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember 		  159us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember 		  1,000,000us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember 		  38,739us-gaap_ShareBasedCompensation
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember 		   
Aggregate Intrinsic Value 4,728,842us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember 		1,398,935us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember 		      4,728,842us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember 		       
Stock Options [Member] | Director [Member]                    
Equity (Textual)                    
Number of stock option granted         531,000us-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         3.58us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember 		         
Aggregate Intrinsic Value         1,400,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember 		    1,400,000us-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       5,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= atnm_EmployeesMember 		           
Share-based Compensation vesting period       4 years            
Stock option exercise prices       2.91us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_TitleOfIndividualAxis
= atnm_EmployeesMember 		           
Aggregate Intrinsic Value       11,000us-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.