STOCK BASED COMPENSATION (Details 1) (USD $)
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12 Months Ended |
Dec. 31, 2014
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Employees [Member] |
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Share Based Payment Award Stock Options Valuation Assumption [Line Items] |
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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] |
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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 |