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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details)	12 Months Ended
	Dec. 31, 2017 USD ($)
Warrant liability [Roll Forward]
Beginning balance
Issuances of warrants	1,612,413
Warrant exercises	(1,893,160)
Change in fair value	280,747
Ending balalnce

X

- Definition

Refers to the amount related to the additions incurred in warrants liabilities during the period.

+ References

No definition available.

+ Details

Name:	atos_AdditionsOfWarrantsLiability
Namespace Prefix:	atos_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

It represents value of increase (decrease) in warrant liability.

+ References

No definition available.

+ Details

Name:	atos_IncreaseDecreaseInWarrantLiability
Namespace Prefix:	atos_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Refers to the amount of warrants exercise during the period.

+ References

No definition available.

+ Details

Name:	atos_WarrantExercises
Namespace Prefix:	atos_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

It represents value of warrant liability.

+ References

No definition available.

+ Details

Name:	atos_WarrantLiability
Namespace Prefix:	atos_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	atos_WarrantLiabilityAbstract
Namespace Prefix:	atos_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration