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Note 15 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands			3 Months Ended		9 Months Ended
	Jun. 26, 2023	Jan. 01, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Lessee, Operating Lease, Monthly Rent Payments	$ 3	$ 2
Operating Lease, Expense			$ 10	$ 3	$ 17	$ 12
Research and Development Arrangement [Member]
Unrecorded Unconditional Purchase Obligation, to be Paid, Remainder of Fiscal Year			$ 5,638		$ 5,638

X

- Definition

Represents the monthly payments by lessee in operating lease.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of operating lease expense. Excludes sublease income.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 4
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479041/842-20-45-4

+ Details

Name:	us-gaap_OperatingLeaseExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of fixed and determinable portion of unrecorded unconditional purchase obligation to be paid in remainder of current fiscal year.

+ References

No definition available.

+ Details

Name:	us-gaap_UnrecordedUnconditionalPurchaseObligationDueInRemainderOfFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis=us-gaap_ResearchAndDevelopmentArrangementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: