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STOCKHOLDERS' EQUITY (Details 1) (USD $)
12 Months Ended
Dec. 31, 2014
May 19, 2014
Jan. 29, 2014
Class of Warrant or Right [Line Items]      
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 15.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1  
2011 Private Placement [Member]      
Class of Warrant or Right [Line Items]      
Class of Warrant or Right, Outstanding 4,252,050us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_PlanNameAxis
= atos_TwoThousandAndElevenPrivatePlacementMember
   
Expiration Dates of Class of Warrant or Right Not Date From Which Warrants or Rights Exercisable Jun. 23, 2016    
2011 Private Placement [Member] | Maximum [Member]      
Class of Warrant or Right [Line Items]      
Class of Warrant or Right, Exercise Price of Warrants or Rights 1.60us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_PlanNameAxis
= atos_TwoThousandAndElevenPrivatePlacementMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
2011 Private Placement [Member] | Minimum [Member]      
Class of Warrant or Right [Line Items]      
Class of Warrant or Right, Exercise Price of Warrants or Rights 1.25us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_PlanNameAxis
= atos_TwoThousandAndElevenPrivatePlacementMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Acuiety Warrants [Member]      
Class of Warrant or Right [Line Items]      
Class of Warrant or Right, Outstanding 325,000us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_PlanNameAxis
= atos_AcuietyWarrantsMember
   
Class of Warrant or Right, Exercise Price of Warrants or Rights 5.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_PlanNameAxis
= atos_AcuietyWarrantsMember
   
Expiration Dates of Class of Warrant or Right Not Date From Which Warrants or Rights Exercisable Sep. 30, 2017    
2014 Public Offering [Member]      
Class of Warrant or Right [Line Items]      
Class of Warrant or Right, Outstanding 1,166,849us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_PlanNameAxis
= atos_TwoThousandAndFourteenPublicOfferingMember
   
Class of Warrant or Right, Exercise Price of Warrants or Rights 3.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_PlanNameAxis
= atos_TwoThousandAndFourteenPublicOfferingMember
  $ 3.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_PlanNameAxis
= atos_TwoThousandAndFourteenPublicOfferingMember
Expiration Dates of Class of Warrant or Right Not Date From Which Warrants or Rights Exercisable Jan. 29, 2019    
Placement Agent Fee [Member]      
Class of Warrant or Right [Line Items]      
Class of Warrant or Right, Outstanding 242,027us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_PlanNameAxis
= atos_PlacementAgentFeeMember
   
Placement Agent Fee [Member] | Maximum [Member]      
Class of Warrant or Right [Line Items]      
Class of Warrant or Right, Exercise Price of Warrants or Rights 12.43us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_PlanNameAxis
= atos_PlacementAgentFeeMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Expiration Dates of Class of Warrant or Right Not Date From Which Warrants or Rights Exercisable Nov. 01, 2018    
Placement Agent Fee [Member] | Minimum [Member]      
Class of Warrant or Right [Line Items]      
Class of Warrant or Right, Exercise Price of Warrants or Rights 2.12us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_PlanNameAxis
= atos_PlacementAgentFeeMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
   
Expiration Dates of Class of Warrant or Right Not Date From Which Warrants or Rights Exercisable Mar. 01, 2018    
outside consulting firm [Member]      
Class of Warrant or Right [Line Items]      
Class of Warrant or Right, Outstanding 47,500us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_PlanNameAxis
= atos_OutsideConsultingFirmMember
   
Class of Warrant or Right, Exercise Price of Warrants or Rights 4.24us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_PlanNameAxis
= atos_OutsideConsultingFirmMember
   
Expiration Dates of Class of Warrant or Right Not Date From Which Warrants or Rights Exercisable Jan. 14, 2018