Annual report pursuant to Section 13 and 15(d)

Subsequent Events (Details)

v2.4.1.9
Subsequent Events (Details) (USD $)
0 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 1 Months Ended 0 Months Ended
Jul. 10, 2014
Apr. 28, 2014
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Feb. 18, 2015
Feb. 11, 2015
Subsequent Events (Textual)                
Issuance during underwritten offering 157,123us-gaap_StockIssuedDuringPeriodSharesNewIssues 500us-gaap_StockIssuedDuringPeriodSharesNewIssues            
Net proceeds from the public offering     $ 12,525,000us-gaap_ProceedsFromIssuanceInitialPublicOffering          
Stock Options [Member]                
Subsequent Events (Textual)                
Number of stock option granted       1,338,100us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
787,450us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
     
Weighted Average Exercise Price, granted       $ 8.86us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
$ 6.62us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
     
Fair value of stock option       8,700,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
3,700,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
     
Stock option contractual term       8 years 4 months 2 days 8 years 10 months 28 days      
Subsequent Event [Member]                
Subsequent Events (Textual)                
Common shares to for cashless exercise of warrants           891,131us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Shares issued to consultants           164,662us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Shares issued to employee           10,000us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
   
Subsequent Event [Member] | Stock Options [Member]                
Subsequent Events (Textual)                
Number of stock option granted             456,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Weighted Average Exercise Price, granted             $ 3.58us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Fair value of stock option             1,000,000us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Stock option contractual term             10 years  
Stock option vesting period             4 years  
Fair value assumption method             Black-Scholes option-pricing model  
Fair value assumptions, discount rate             1.66%atnm_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDiscountRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Fair value assumptions, expected life             6 years  
Fair value assumptions, expected volatility rate             82.47%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Fair value assumptions, expected dividend rate             0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Subsequent Event [Member] | Public Offering [Member]                
Subsequent Events (Textual)                
Issuance during underwritten offering               3,333,333us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
Price per share               $ 4.50us-gaap_SharePrice
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
Term of warrants               4 years
Exercise price of warrants               $ 6.5us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
Net proceeds from the public offering               $ 18,500,000us-gaap_ProceedsFromIssuanceInitialPublicOffering
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
Subsequent Event [Member] | Public Offering [Member] | Warrants [Member]                
Subsequent Events (Textual)                
Stock issued to cover over allotment               499,999atnm_StockIssuedDuringPeriodOverAllotment
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
Issuance during underwritten offering               4,444,444us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
Subsequent Event [Member] | Public Offering [Member] | Common Stock [Member]                
Subsequent Events (Textual)                
Stock issued to cover over allotment               666,666atnm_StockIssuedDuringPeriodOverAllotment
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
Issuance during underwritten offering               4,444,444us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember