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STOCK BASED COMPENSATION (Details 1) (USD $)
12 Months Ended
Dec. 31, 2014
Employees [Member]  
Share Based Payment Award Stock Options Valuation Assumption [Line Items]  
Dividend yield 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_TitleOfIndividualAxis
= atos_EmployeesMember
Expected forfeiture per year (%) 10.00%atos_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate
/ us-gaap_TitleOfIndividualAxis
= atos_EmployeesMember
Weighted average fair value of the options per unit $ 0.64atos_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageFairValue
/ us-gaap_TitleOfIndividualAxis
= atos_EmployeesMember
Employees [Member] | Minimum [Member]  
Share Based Payment Award Stock Options Valuation Assumption [Line Items]  
Fair value of common stock on date of grant $ 0.96us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TitleOfIndividualAxis
= atos_EmployeesMember
Exercise price of the options $ 0.96us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TitleOfIndividualAxis
= atos_EmployeesMember
Expected life of the options (years) 6 years 22 days
Expected volatility 38.83%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TitleOfIndividualAxis
= atos_EmployeesMember
Risk-free interest rate 1.75%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TitleOfIndividualAxis
= atos_EmployeesMember
Employees [Member] | Maximum [Member]  
Share Based Payment Award Stock Options Valuation Assumption [Line Items]  
Fair value of common stock on date of grant $ 2.20us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TitleOfIndividualAxis
= atos_EmployeesMember
Exercise price of the options $ 2.20us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TitleOfIndividualAxis
= atos_EmployeesMember
Expected life of the options (years) 6 years 1 month 10 days
Expected volatility 41.72%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TitleOfIndividualAxis
= atos_EmployeesMember
Risk-free interest rate 2.11%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TitleOfIndividualAxis
= atos_EmployeesMember
Directors [Member]  
Share Based Payment Award Stock Options Valuation Assumption [Line Items]  
Dividend yield 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_TitleOfIndividualAxis
= atos_DirectorsMember
Expected forfeiture per year (%) 10.00%atos_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate
/ us-gaap_TitleOfIndividualAxis
= atos_DirectorsMember
Weighted average fair value of the options per unit $ 0.70atos_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageFairValue
/ us-gaap_TitleOfIndividualAxis
= atos_DirectorsMember
Directors [Member] | Minimum [Member]  
Share Based Payment Award Stock Options Valuation Assumption [Line Items]  
Fair value of common stock on date of grant $ 1.22us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TitleOfIndividualAxis
= atos_DirectorsMember
Exercise price of the options $ 1.22us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TitleOfIndividualAxis
= atos_DirectorsMember
Expected life of the options (years) 5 years 1 month 2 days
Expected volatility 38.64%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TitleOfIndividualAxis
= atos_DirectorsMember
Risk-free interest rate 1.53%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TitleOfIndividualAxis
= atos_DirectorsMember
Directors [Member] | Maximum [Member]  
Share Based Payment Award Stock Options Valuation Assumption [Line Items]  
Fair value of common stock on date of grant $ 2.20us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TitleOfIndividualAxis
= atos_DirectorsMember
Exercise price of the options $ 2.20us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TitleOfIndividualAxis
= atos_DirectorsMember
Expected life of the options (years) 5 years 3 months 22 days
Expected volatility 38.68%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TitleOfIndividualAxis
= atos_DirectorsMember
Risk-free interest rate 1.75%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TitleOfIndividualAxis
= atos_DirectorsMember
Executives and Officers [Member]  
Share Based Payment Award Stock Options Valuation Assumption [Line Items]  
Dividend yield 0.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
/ us-gaap_TitleOfIndividualAxis
= atos_ExecutivesAndOfficersMember
Expected forfeiture per year (%) 10.00%atos_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedForfeitureRate
/ us-gaap_TitleOfIndividualAxis
= atos_ExecutivesAndOfficersMember
Weighted average fair value of the options per unit $ 0.56atos_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsWeightedAverageFairValue
/ us-gaap_TitleOfIndividualAxis
= atos_ExecutivesAndOfficersMember
Executives and Officers [Member] | Minimum [Member]  
Share Based Payment Award Stock Options Valuation Assumption [Line Items]  
Fair value of common stock on date of grant $ 0.96us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TitleOfIndividualAxis
= atos_ExecutivesAndOfficersMember
Exercise price of the options $ 0.96us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TitleOfIndividualAxis
= atos_ExecutivesAndOfficersMember
Expected life of the options (years) 6 years 22 days
Expected volatility 38.83%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TitleOfIndividualAxis
= atos_ExecutivesAndOfficersMember
Risk-free interest rate 1.75%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_TitleOfIndividualAxis
= atos_ExecutivesAndOfficersMember
Executives and Officers [Member] | Maximum [Member]  
Share Based Payment Award Stock Options Valuation Assumption [Line Items]  
Fair value of common stock on date of grant $ 2.20us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TitleOfIndividualAxis
= atos_ExecutivesAndOfficersMember
Exercise price of the options $ 2.20us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExercisePrice
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TitleOfIndividualAxis
= atos_ExecutivesAndOfficersMember
Expected life of the options (years) 6 years 1 month 10 days
Expected volatility 41.70%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TitleOfIndividualAxis
= atos_ExecutivesAndOfficersMember
Risk-free interest rate 2.11%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TitleOfIndividualAxis
= atos_ExecutivesAndOfficersMember