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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: |