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STOCK BASED COMPENSATION (Details 2) (USD $)
12 Months Ended
Dec. 31, 2014
Share Based Compensation Stock Options Activity [Line Items]  
Number of Underlying Shares, Outstanding as of January 1, 2014 (in shares) 2,282,719us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Number of Underlying Shares, Granted (in shares) 2,426,669us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Number of Underlying Shares, Forfeited (in shares) (873,754)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
Number of Underlying Shares, Exercised (in shares) (160,000)atos_StockIssuedDuringPeriodSharesStockOptionsExercised1
Number of Underlying Shares, Outstanding as of December 31, 2014 (in shares) 3,675,634us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Number of Underlying Shares, Exercisable as of December 31, 2014 (in shares) 1,391,749us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Number of Underlying Shares, Vested and expected to vest (in shares) 3,380,169us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber [1]
Weighted-Average Exercise Price Per Share, Outstanding as of January 1, 2014 (in dollars per share) $ 4.43us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Weighted-Average Exercise Price Per Share, Granted (in dollars per share) $ 1.45us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
Weighted-Average Exercise Price Per Share, Forfeited (in dollars per share) $ 4.29us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
Weighted-Average Exercise Price Per Share, Exercised (in dollars per share) $ 1.25us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
Weighted-Average Exercise Price Per Share, Outstanding as of December 31, 2014 (in dollars per share) $ 2.86us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Weighted-Average Exercise Price Per Share, Exercisable as of December 31, 2014 (in dollars per share) $ 4.34us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
Weighted-Average Exercise Price Per Share, Vested and expected to vest (in dollars per share) $ 2.95us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice [1]
Weighted-Average Contractual Life Remaining in Years, Outstanding as of December 31, 2014 8 years 1 month 10 days
Weighted-Average Contractual Life Remaining in Years, Exercisable as of December 31, 2014 6 years 3 months 22 days
Weighted-Average Contractual Life Remaining in Years, Vested and expected to vest 8 years 4 days [1]
Aggregate Intrinsic Value, Outstanding as of January 1, 2014 $ 282,063us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Aggregate Intrinsic Value, Forfeited (in dollars) 21,540atos_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeitedInPeriodTotalIntrinsicValue
Aggregate Intrinsic Value, Exercised (in dollars) 69,388us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Aggregate Intrinsic Value, Outstanding as of December 31, 2014 344,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Aggregate Intrinsic Value, Exercisable as of December 31, 2014 37,878us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
Aggregate Intrinsic Value, Vested and expected to vest $ 301,945us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue [1]
[1] vested shares and unvested shares after a forfeiture rate is applied