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STOCKHOLDERS' EQUITY (Details Textual) (USD $)
1 Months Ended 12 Months Ended
Jan. 29, 2014
Dec. 31, 2014
May 19, 2014
Dec. 31, 2013
Stockholder's Equity [Line Items]        
Total Shares Authorized   85,000,000atos_TotalSharesAuthorized    
Common Stock, Shares Authorized   75,000,000us-gaap_CommonStockSharesAuthorized   75,000,000us-gaap_CommonStockSharesAuthorized
Common Stock, Par or Stated Value Per Share (in dollars per share)   $ 0.001us-gaap_CommonStockParOrStatedValuePerShare   $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
Preferred Stock, Shares Authorized   10,000,000us-gaap_PreferredStockSharesAuthorized   10,000,000us-gaap_PreferredStockSharesAuthorized
Preferred Stock, Par or Stated Value Per Share (in dollars per share)   $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare   $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   6,033,426us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights    
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 15.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1  
Percentage of Common Stock Outstanding     2.00%atos_PercentageOfCommonStockOutstanding  
Entitled to Receive Worth of Common Stock     $ 30.00atos_EntitledToReceiveWorthOfCommonStock  
Series A Preferred Stock [Member]        
Stockholder's Equity [Line Items]        
Preferred Stock, Shares Authorized   750,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
   
Preferred Stock, Par or Stated Value Per Share (in dollars per share)   $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
   
2014 Public Offering [Member]        
Stockholder's Equity [Line Items]        
Shares, Issued 5,834,234us-gaap_SharesIssued
/ us-gaap_PlanNameAxis
= atos_TwoThousandAndFourteenPublicOfferingMember
     
Shares Issued, Price Per Share $ 2.40us-gaap_SharesIssuedPricePerShare
/ us-gaap_PlanNameAxis
= atos_TwoThousandAndFourteenPublicOfferingMember
     
Proceeds from Issuance or Sale of Equity $ 14,000,000us-gaap_ProceedsFromIssuanceOrSaleOfEquity
/ us-gaap_PlanNameAxis
= atos_TwoThousandAndFourteenPublicOfferingMember
     
Stockholders Equity Note, Stock Split   Each unit consists of one share of common stock and a warrant to purchase 0.20 of a share of common stock (the 2014 Investor Warrants).    
Warrants Callable Per Share $ 6.00atos_WarrantsCallablePerShare
/ 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
   
Acuiety Warrants [Member]        
Stockholder's Equity [Line Items]        
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 5.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_PlanNameAxis
= atos_AcuietyWarrantsMember
   
outside consulting firm [Member]        
Stockholder's Equity [Line Items]        
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 4.24us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_PlanNameAxis
= atos_OutsideConsultingFirmMember
   
Investor Warrants 2014 [Member]        
Stockholder's Equity [Line Items]        
Option Indexed To Issuer's Equity, Indexed Shares 1,166,849us-gaap_OptionIndexedToIssuersEquityIndexedShares
/ us-gaap_StatementEquityComponentsAxis
= atos_InvestorWarrants2014Member
     
Securities Purchase Agreements, Investor Warrants [Member]        
Stockholder's Equity [Line Items]        
Fair Value of Warrants (in dollars per warrant) $ 0.72atos_FairValueOfWarrants
/ atos_SecuritiesPurchaseAgreementsAxis
= atos_SecuritiesPurchaseAgreementsInvestorWarrantsMember
     
Initial Fair Value of Warrants 834,986atos_InitialFairValueOfWarrants
/ atos_SecuritiesPurchaseAgreementsAxis
= atos_SecuritiesPurchaseAgreementsInvestorWarrantsMember
     
Placement Agent Warrants [Member]        
Stockholder's Equity [Line Items]        
Option Indexed To Issuer's Equity, Indexed Shares 175,027us-gaap_OptionIndexedToIssuersEquityIndexedShares
/ atos_SecuritiesPurchaseAgreementsAxis
= atos_PlacementAgentWarrantsMember
     
Placement Agent [Member]        
Stockholder's Equity [Line Items]        
Cash Fee Equals to Percentage of Gross Proceeds from Sale of Common Stock and Warrants   7.00%atos_CashFeeEqualsToPercentageOfGrossProceedsFromSaleOfCommonStockAndWarrants
/ us-gaap_TitleOfIndividualAxis
= atos_PlacementAgentMember
   
Fees and Commissions, Other 980,151us-gaap_PaymentsOfStockIssuanceCosts
/ us-gaap_TitleOfIndividualAxis
= atos_PlacementAgentMember
     
Placement Agent [Member] | Warrant [Member]        
Stockholder's Equity [Line Items]        
Exercise Price of Common Stock   $ 3.00atos_ExercisePriceOfCommonStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
/ us-gaap_TitleOfIndividualAxis
= atos_PlacementAgentMember
   
Fair Value of Warrants (in dollars per warrant) $ 0.70atos_FairValueOfWarrants
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
/ us-gaap_TitleOfIndividualAxis
= atos_PlacementAgentMember
     
Initial Fair Value of Warrants $ 121,707atos_InitialFairValueOfWarrants
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
/ us-gaap_TitleOfIndividualAxis
= atos_PlacementAgentMember
     
Option Indexed To Issuer's Equity, Indexed Shares 175,027us-gaap_OptionIndexedToIssuersEquityIndexedShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
/ us-gaap_TitleOfIndividualAxis
= atos_PlacementAgentMember
     
Percentage of Shares Sold in Offering 3.00%atos_PercentageOfSharesSoldInOffering
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember
/ us-gaap_TitleOfIndividualAxis
= atos_PlacementAgentMember
     
Minimum [Member] | 2011 Private Placement [Member]        
Stockholder's Equity [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
   
Maximum [Member] | 2011 Private Placement [Member]        
Stockholder's Equity [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
   
Beneficial Owner [Member]        
Stockholder's Equity [Line Items]        
Equity Method Investment, Ownership Percentage     15.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_BeneficialOwnerMember