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STOCK BASED COMPENSATION (Details 2) (USD $)
3 Months Ended
Mar. 31, 2015
Share Based Compensation Stock Options Activity [Line Items]  
Number of Underlying Shares, Outstanding as of January 1, 2015 (in shares) 3,675,634us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Number of Underlying Shares, Granted (in shares) 768,322us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Number of Underlying Shares, Forfeited (in shares) (89,538)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
Number of Underlying Shares, Exercised (in shares) 0atos_StockIssuedDuringPeriodSharesStockOptionsExercised1
Number of Underlying Shares, Outstanding as of March 31, 2015 (in shares) 4,354,418us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Number of Underlying Shares, Exercisable as of March 31, 2015 (in shares) 1,494,728us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber
Number of Underlying Shares, Vested and expected to vest (in shares) 3,967,136us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber [1]
Weighted-Average Exercise Price Per Share, Outstanding as of January 1, 2015 (in dollars per share) $ 2.86us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Weighted-Average Exercise Price Per Share, Granted (in dollars per share) $ 1.56us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
Weighted-Average Exercise Price Per Share, Forfeited (in dollars per share) $ 0.70us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice
Weighted-Average Exercise Price Per Share, Exercised (in dollars per share) $ 0us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice
Weighted-Average Exercise Price Per Share, Outstanding as of March 31, 2015 (in dollars per share) $ 2.71us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
Weighted-Average Exercise Price Per Share, Exercisable as of March 31, 2015 (in dollars per share) $ 4.21us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
Weighted-Average Exercise Price Per Share, Vested and expected to vest (in dollars per share) $ 2.79us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice [1]
Weighted-Average Contractual Life Remaining in Years, Outstanding as of March 31, 2015 8 years 2 months 12 days
Weighted-Average Contractual Life Remaining in Years, Exercisable as of March 31, 2015 6 years 2 months 23 days
Weighted-Average Contractual Life Remaining in Years, Vested and expected to vest 8 years 1 month 2 days [1]
Aggregate Intrinsic Value, Outstanding as of January 1, 2015 $ 344,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Aggregate Intrinsic Value, Forfeited (in dollars) 51,750atos_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeitedInPeriodTotalIntrinsicValue
Aggregate Intrinsic Value, Exercised (in dollars) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
Aggregate Intrinsic Value, Outstanding as of March 31, 2015 884,650us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Aggregate Intrinsic Value, Exercisable as of March 31, 2015 140,282us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
Aggregate Intrinsic Value, Vested and expected to vest $ 797,960us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableAggregateIntrinsicValue [1]
[1] vested shares and unvested shares after a forfeiture rate is applied.