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STOCK BASED COMPENSATION (Details Textual) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Sep. 28, 2010
Stock-based Compensation [Line Items]              
Share-based Compensation $ 180,628us-gaap_AllocatedShareBasedCompensationExpense $ 230,181us-gaap_AllocatedShareBasedCompensationExpense          
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Grants In Period, Gross 768,322us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years 1 month 28 days            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares 2,859,690us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares            
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 2,302,162us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized            
Stock Option and Incentive Plan 2010 [Member]              
Stock-based Compensation [Line Items]              
Shares held in Employee Stock Option Plan, Suspense Shares     983,362us-gaap_SharesHeldInEmployeeStockOptionPlanSuspenseShares
/ us-gaap_AwardTypeAxis
= atos_StockOptionAndIncentivePlan2010Member
742,973us-gaap_SharesHeldInEmployeeStockOptionPlanSuspenseShares
/ us-gaap_AwardTypeAxis
= atos_StockOptionAndIncentivePlan2010Member
516,774us-gaap_SharesHeldInEmployeeStockOptionPlanSuspenseShares
/ us-gaap_AwardTypeAxis
= atos_StockOptionAndIncentivePlan2010Member
450,275us-gaap_SharesHeldInEmployeeStockOptionPlanSuspenseShares
/ us-gaap_AwardTypeAxis
= atos_StockOptionAndIncentivePlan2010Member
1,000,000us-gaap_SharesHeldInEmployeeStockOptionPlanSuspenseShares
/ us-gaap_AwardTypeAxis
= atos_StockOptionAndIncentivePlan2010Member
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 743,966us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_AwardTypeAxis
= atos_StockOptionAndIncentivePlan2010Member