75000 - Document - Document And Entity Information
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75010 - Statement - Consolidated Balance Sheets
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75020 - Statement - Consolidated Balance Sheets (Parentheticals)
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75030 - Statement - Consolidated Statements of Operations
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75040 - Statement - Consolidated Statements of Stockholders' Equity
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75050 - Statement - Consolidated Statements of Stockholders' Equity (Parenthetical)
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75060 - Statement - Consolidated Statements of Cash Flows
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75070 - Disclosure - Cybersecurity Risk Management, Strategy, and Governance
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995455 - Disclosure - Nature of Operations
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995465 - Disclosure - Going Concern
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995475 - Disclosure - Summary of Significant Accounting Policies
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995485 - Disclosure - Investment in Equity Securities
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995495 - Disclosure - Prepaid Expenses and Other Current Assets
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995505 - Disclosure - Accrued Expenses
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995515 - Disclosure - Payroll Liabilities
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995525 - Disclosure - Research and Development Tax Rebate Liability
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995535 - Disclosure - Fair Value of Financial Instruments
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995545 - Disclosure - Stockholders' Equity
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995555 - Disclosure - Net Loss Per Share
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995565 - Disclosure - Income Taxes
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995575 - Disclosure - Commitments and Contingencies
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995585 - Disclosure - Stock Based Compensation
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995595 - Disclosure - Defined Contribution Plan
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995605 - Disclosure - Segments
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995615 - Disclosure - Subsequent Event
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995625 - Disclosure - Summary of Significant Accounting Policies (Policies)
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995635 - Disclosure - Prepaid Expenses and Other Current Assets (Tables)
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995645 - Disclosure - Accrued Expenses (Tables)
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995655 - Disclosure - Payroll Liabilities (Tables)
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995665 - Disclosure - Fair Value of Financial Instruments (Tables)
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995675 - Disclosure - Stockholders' Equity (Tables)
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995685 - Disclosure - Net Loss Per Share (Tables)
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995695 - Disclosure - Income Taxes (Tables)
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995705 - Disclosure - Stock Based Compensation (Tables)
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995715 - Disclosure - Going Concern - Additional Information (Details)
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995725 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Details)
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995735 - Disclosure - Investment in Equity Securities - Additional Information (Details)
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995745 - Disclosure - Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses (Details)
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995755 - Disclosure - Accrued Expenses - Summary of Accrued Expenses (Details)
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995765 - Disclosure - Payroll Liabilities - Schedule of Payroll Liabilities (Details)
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995775 - Disclosure - Research and Development Tax Rebate Liability - Additional Information (Details)
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995785 - Disclosure - Fair Value of Financial Instruments - Schedule of Assets and Liabilities Measured on Recurring Basis (Details)
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995795 - Disclosure - Fair Value of Financial Instruments - Schedule of Changes in Warrant Liability (Details)
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995805 - Disclosure - Stockholders' Equity - Additional Information (Details)
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995815 - Disclosure - Net Loss Per Share - Schedule of Antidilutive Securities (Details)
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995825 - Disclosure - Income Taxes - Effective Income Tax Rate Reconciliation (Details)
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995835 - Disclosure - Income Taxes - Components of Net Deferred Tax Assets and Liabilities (Details)
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995845 - Disclosure - Income Taxes - Additional Information (Details)
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995855 - Disclosure - Commitments and Contingencies - Additional Information (Details)
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995865 - Disclosure - Stock Based Compensation - Additional Information (Details)
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995875 - Disclosure - Stock Based Compensation - Schedule of Fair Values of Stock Options Granted Using Black-Scholes Option-Pricing Model (Details)
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995885 - Disclosure - Stock Based Compensation - Schedule of Share-Based Compensation Expense (Details)
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995895 - Disclosure - Stock Based Compensation - Schedule of Option Activity for Share-Based Payment Arrangement (Details)
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995905 - Disclosure - Defined Contribution Plan - Additional Information (Details)
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995915 - Disclosure - Segments - Additional Information (Details)
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995925 - Disclosure - Subsequent Event - Additional Information (Details)
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Working capital
Represents the value of total current assets net of current liabilities as of the balance sheet date.
atos_WorkingCapitalDeficit
Working Capital (Deficit)
Entity Incorporation, State or Country Code
Preferred stock, shares issued
Preferred stock, issued (in shares)
Preferred Stock, Shares Issued
Ending balance
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value
Beginning balance
Increase (Decrease) in Accounts Payable, Total
Increase (Decrease) in Accounts Payable
Accounts payable
Reverse Stock Split [Member]
Reverse stock split.
Reverse Stock Split [Member]
December Two Zero Two Zero Warrants Member
December 2020 Warrants.
December 2020 Warrants [Member]
Plan Name [Axis]
Equity [Abstract]
Entity Current Reporting Status
Proceeds from exercise of warrants
Proceeds from Warrant Exercises
Exercises of warrants
Unrecorded Unconditional Purchase Obligation [Table]
Operating expenses
Operating Expenses [Abstract]
Fair Value, Inputs, Level 2 [Member]
Net deferred tax assets
Deferred Tax Assets, Net of Valuation Allowance
Commitments and Contingencies
Commitments and Contingencies Disclosure [Text Block]
Reverse Stock Split
Reverse Stock Split Policy [Policy Text Block]
Reverse stock split policy.
Common stock, shares authorized
Common stock, authorized (in shares)
Common Stock, Shares Authorized
Fair Value by Liability Class [Domain]
Document Fiscal Period Focus
Accounting Standards Update 2023-09 [Member]
ASU 2023-09 [Member]
Entity Shell Company
Issuance of warrants
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances
Prepaid Pre Clinical and Clinical Trial Deposits
Prepaid pre-clinical and clinical trial deposits.
Prepaid pre-clinical and clinical trial deposits
Cash and cash equivalents
Cash and Cash Equivalents, at Carrying Value, Total
Cash and Cash Equivalent
Cash and cash equivalents
Cash and Cash Equivalents, at Carrying Value, Total
Research and Development Tax Rebate Liability
Research And Development Tax Rebate Liability Disclosure [Text Block]
Research and development tax rebate liability.
Cybersecurity Risk Management, Strategy, and Governance [Abstract]
Common stock, issued (in shares)
Common Stock, Shares, Issued
Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]
Cybersecurity Risk Board of Directors Oversight [Text Block]
Asset Class [Domain]
Statement [Table]
Increase (Decrease) in Prepaid Expense
Prepaid materials
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value
Weighted average grant date fair value of options granted
Statement [Line Items]
Common stock repurchased
Common stock repurchased
Treasury Stock, Value, Acquired, Cost Method
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price
Weighted-Average Exercise Price Per Share, Expired
Warrants to Purchase Common Stock [Member]
Warrant [Member]
Other Expense [Member]
Entity Filer Category
Reclassification
Reclassification, Comparability Adjustment [Policy Text Block]
Liabilities and Equity
Total Liabilities and Stockholders' Equity
Payables and Accruals [Abstract]
Increase (Decrease) in Employee Related Liabilities, Total
Increase (Decrease) in Employee Related Liabilities
Payroll liabilities
Changes in unrecognized tax benefits
Effective Income Tax Rate Reconciliation, Tax Contingency, Percent
Effective Income Tax Rate Reconciliation, Tax Contingency, Percent, Total
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price
Weighted-Average Exercise Price Per Share, Exercisable
Valuation allowance, deferred tax asset, increase (decrease), amount
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount
Operating Loss Carryforwards [Table]
Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]
Latest Tax Year [Member]
Cash and Cash Equivalents, Fair Value Disclosure
Money market account
Deferred tax assets, valuation allowance
Deferred Tax Assets, Valuation Allowance
Valuation allowance
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent
Income tax benefit at the U.S. federal statutory rate
Subsequent Event [Line Items]
Cybersecurity Risk Management Third Party Engaged [Flag]
Documents Incorporated by Reference [Text Block]
Effective Income Tax Rate Reconciliation, Percent
Effective income tax rate
Options to Purchase Common Stock [Member]
Interest income
Investment Income, Interest
Treasury Stock, Common, Value
Treasury stock, at cost; 88,003 shares of common stock at December 31, 2025 and 2024 respectively
Income Tax Jurisdiction [Axis]
Represents the amount of increase (decrease) in research and development tax rebate receivable.
atos_IncreaseDecreaseInResearchAndDevelopmentTaxRebateReceivable
Research and development tax rebate receivable
Investments in Equity Securities
Equity Securities without Readily Determinable Fair Value [Policy Text Block]
Restricted Cash
Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]
Defined Contribution Plan [Abstract]
Conversion of Series B convertible preferred stock to common stock
Conversion of Stock, Amount Converted
Defined Contribution Plan
Defined Contribution Plan [Text Block]
Share Repurchase Program [Axis]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross
Number of Underlying Shares, Granted
Number of Underlying Shares, Granted
Cybersecurity Risk Management, Strategy, and Governance [Table]
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Research and Development, Amount
Disallowed R&D expenses
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount [Abstract]
Non taxable or non deductible items
Investment, Name [Axis]
Net loss per share of common stock - basic (in dollars per share)
Net loss per share of common stock, basic (in dollars per share)
Earnings Per Share, Basic, Total
Earnings Per Share, Basic
Stock Issued During Period Shares Stock Options Exercised 1
Stock issued during period shares stock options exercised 1.
Issuance of common stock upon option exercise (in shares)
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number
Number of Underlying Shares, Outstanding
Number of Underlying Shares, Outstanding
Stock Issued
Common stock issued upon cashless exercise of stock options
Liabilities, Current
Total current liabilities
Adjustments to reconcile net loss to net cash used in operating activities
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract]
Schedule of Changes in Warrant Liability
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
Domestic Tax Jurisdiction [Member]
Domestic Tax Authority [Member]
Share Repurchase Program [Domain]
Effective Income Tax Rate Reconciliation [Table]
Other Assets
Other Assets [Policy Text Block]
Other assets.
Accounting Standards Update [Axis]
Operating loss carryforwards, expiration year
Year of expiration for operating loss carry-forwards.
atos_OperatingLossCarryforwardsExpirationYear
Stockholders' equity
Equity, Attributable to Parent [Abstract]
Entity Small Business
Increase (Decrease) in Accrued Liabilities, Total
Increase (Decrease) in Accrued Liabilities
Accrued expenses
Accumulated deficit
Retained Earnings (Accumulated Deficit), Total
Retained Earnings (Accumulated Deficit)
Stock-based compensation
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-Based Compensation Cost
Nature of Operations
Nature of Operations [Text Block]
Accrued Expenses
Accrued Liabilities Disclosure [Text Block]
The entire disclosure for accrued liabilities at the end of the reporting period.
Preferred Stock [Member]
Effective Income Tax Rate Reconciliation, Cross-Border Tax Effect, Amount
Effective Income Tax Rate Reconciliation, Cross-Border Tax Effect, Amount, Total
Effect of cross border tax laws
Effect of cross border tax laws
Entity Well-known Seasoned Issuer
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period
Number of Underlying Shares, Forfeited
Share-Based Payment Arrangement [Text Block]
Stock Based Compensation
Effective Income Tax Rate Reconciliation, Dual Taxation of Subsidiary, Percent
Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to dual taxation of subsidiary.
Dual taxation of Australian subsidiary
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain]
Amendment
Amendment Flag
Issuance of common stock upon option exercise
Stock Issued During Period Value Stock Options Exercised 1
Stock issued during period value stock options exercised 1.
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount
Income tax benefit at the U.S. federal statutory rate
Effective Income Tax Rate Reconciliation Deferred Items
Effective Income Tax Rate Reconciliation Deferred Items
Return to provision
Liabilities and stockholders' equity
Liabilities and Equity [Abstract]
Entity Address, Postal Zip Code
Cash in operating activities
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation
Net Cash Provided by (Used in) Operating Activities, Total
Net cash used in operating activities
Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description
Common Stock [Member]
Represents information about the 2018 warrants.
The 2018 Warrants [Member]
Cybersecurity Risk Role of Management [Text Block]
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price
Weighted-Average Exercise Price Per Share, Granted
Entity Address, Address Line One
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]
Schedule of Fair Values of Stock Options Granted Using Black-Scholes Option-Pricing Model
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Fair Value Hierarchy and NAV [Axis]
Earnings Per Share [Abstract]
Income Taxes
Income Tax, Policy [Policy Text Block]
Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag]
Total gross deferred tax asset
Deferred Tax Assets, Gross
Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]
Accrued pre-clinical and clinical trial costs.
Accrued pre-clinical and clinical trial costs
Accrued Pre Clinical and Clinical Trial Costs
Class of Warrant or Right [Axis]
Document Type
Document Type
CIK
Entity Central Index Key
Summary of Accounting Policies [Line Items]
Summary of accounting policies.
Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]
Valuation Approach and Technique [Axis]
NET DECREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation
Subsequent Event Type [Domain]
Number of potential common shares excluded (in shares)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Investment in equity securities
Deferred Tax Assets, Equity Method Investments
Common stock, par or stated value per share
Common stock, par value (in dollars per share)
Common Stock, Par or Stated Value Per Share
Accounting Standards Update [Domain]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term
Weighted-Average Contractual Life Remaining in Years, Outstanding
Expected volatility, Maximum
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum
Prepaid Materials
Prepaid Expenses [Policy Text Block]
Prepaid expenses.
Document Financial Statement Error Correction [Flag]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)
Number of Underlying Shares, Exercised
Options exercised
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Number of Shares, Ending Balance
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Number of Shares, Beginning Balance
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Number of Shares
Unvested options outstanding
Other
Other Prepaid Expense, Current
Total accrued expenses
Accrued expenses
Accrued Liabilities, Current
Current Fiscal Year End Date
Unrecorded Unconditional Purchase Obligation [Line Items]
Fair Value, by Balance Sheet Grouping [Table]
Entity Address, State or Province
Issuance of common stock upon Series B preferred stock conversion
Stock Issued During Period, Value, Conversion of Convertible Securities
Investment, Name [Domain]
Preferred stock, outstanding (in shares)
Preferred Stock, Shares Outstanding, Ending Balance
Preferred Stock, Shares Outstanding, Beginning Balance
Preferred Stock, Shares Outstanding
Preferred stock, outstanding
Research and Development
Research and Development Expense, Policy [Policy Text Block]
Class of Warrant or Right [Domain]
Shares withheld related to cashless exercise of options and taxes (in shares)
Represents the number of shares redeemed or called during the period for stock option exercise and taxes.
atos_StockRedeemedOrCalledDuringPeriodForStockOptionExerciseAndTaxesShares
Shares withheld related to cashless exercise of options and taxes (in shares)
Conversion of Series B convertible preferred stock to common stock (in shares)
Conversion of Stock, Shares Converted
Conversion of stock, shares converted
Variable interest entity, qualitative or quantitative information, ownership percentage
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount
State income taxes, net of federal income tax effect
Schedule of Share-Based Compensation Expense
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount
Other non-taxable income & disallowed expenses
Accrued bonuses
Accrued Bonuses, Current
Payroll Liabilities
Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block]
Schedule of Deferred Tax Assets and Liabilities
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
Subsequent Event [Member]
Subsequent Event [Member]
Represents conversion of Series B Convertible Preferred Stock into common stock shares.
Conversion of Series B Convertible Preferred Stock into Common Stock [Member]
Other assets
Other Assets, Noncurrent
Measurement Input, Expected Term [Member]
Antidilutive Securities [Axis]
Operating Loss Carryforwards [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Expirations in Period
Number of Underlying Shares, Expired
Summary of Significant Accounting Policies
Basis of Presentation and Significant Accounting Policies [Text Block]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value
Aggregate Intrinsic Value, Exercisable, Vested and expected to vest
atos_StatedValuePerShare
Stated value per share
Represents the stated value per share.
Treasury stock, shares (in shares)
Treasury Stock, Common, Shares
Preferred Stock, Value, Issued
Series B convertible preferred stock - $0.001 par value; 10,000,000 shares authorized; 577 and 582 shares issued and outstanding as of December 31, 2025 and 2024, respectively
Minimum [Member]
Minimum [Member]
Current assets
Assets, Current [Abstract]
Fair Value, Inputs, Level 3 [Member]
Segment Reporting [Abstract]
Deferred Tax Liabilities, Property, Plant and Equipment
Fixed assets
Schedule of Assets and Liabilities Measured on Recurring Basis
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Tax Period [Domain]
Amount of asset related to consideration paid in advance for professional services costs that provide benefits within a future period of one year or the normal operating cycle, if longer.
Professional services
Current liabilities
Liabilities, Current [Abstract]
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities
Accrued bonus
Shares, Outstanding
Balance (in shares)
Balance (in shares)
Operating loss carryforwards
Operating Loss Carryforwards
Restricted cash
Restricted Cash and Cash Equivalents, Total
Restricted Cash and Cash Equivalent
Restricted cash
Restricted Cash and Cash Equivalents, Total
Commitments and contingencies (Note 13)
Commitments and Contingencies
Consummate a business combination, percentage of acquired outstanding shares
Represents the percentage of acquired outstanding shares when company consummates a business.
atos_ConsummateABusinessCombinationPercentageOfAcquiredOutstandingShares
General and administrative
General and Administrative Expense [Member]
Auditor Firm ID
Represents information about series A convertible preferred stock.
Series A Convertible Preferred Stock [Member]
Stockholders' Equity, Reverse Stock Split
Reverse stock split
Summary of Accounting Policies [Table]
Summary of accounting policies.
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent
Effect of change in valuation allowance
Effect of change in valuation allowance
Australia [Member]
AUSTRALIA
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount [Abstract]
Foreign income tax rate differential.
Foreign tax effects
Valuation, Cost Approach [Member]
Cybersecurity Risk Management Positions or Committees Responsible [Text Block]
Weighted average shares outstanding used to compute net loss per share- basic (in shares)
Weighted average common shares outstanding used to compute net loss per share, basic (in shares)
Weighted Average Number of Shares Outstanding, Basic, Total
Weighted Average Number of Shares Outstanding, Basic
Accrued Expenses [Policy Text Block]
Accrued expenses.
Clinical Trial and Preclinical Study Accruals
Document Information:
Document Information [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value
Aggregate Intrinsic Value, Exercisable
Increase (Decrease) in Other Current Liabilities
Other current liabilities
Schedule of Effective Income Tax Rate Reconciliation
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table]
Unrecorded unconditional purchase pbligation, to be paid, remainder of fiscal year
Unrecorded Unconditional Purchase Obligation, to be Paid, Remainder of Fiscal Year
Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]
Deferred tax assets
Deferred Tax Assets, Net [Abstract]
Subsequent Events [Text Block]
Subsequent Event
Effective Income Tax Rate Reconciliation, Tax Credit, Percent
Effective Income Tax Rate Reconciliation, Tax Credit, Percent, Total
Tax credits
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount
Change in valuation allowance
Equity, Attributable to Parent
Balance
Balance
Stockholders' Equity Attributable to Parent, Ending Balance
Total Stockholders' Equity
Preferred stock, par or stated value per share
Preferred stock, par value (in dollars per share)
Preferred Stock, Par or Stated Value Per Share
Class of warrant or right, exercised during period
The number of warrants or rights exercised during period.
atos_ClassOfWarrantOrRightExercisedDuringPeriod
2021 and 2020 Warrants [Member]
Two Zero Two One and Two Zero Two Zero Warrants Member
2021 and 2020 Warrants.
Basis of Presentation
Basis of Accounting, Policy [Policy Text Block]
Statement of Stockholders' Equity [Abstract]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Valuation Approach and Technique [Domain]
Other Liabilities Disclosure [Abstract]
Use of Estimates
Use of Estimates, Policy [Policy Text Block]
Equity Method Investment [Table]
Treasury Stock, Common [Member]
Entity Address, Address Line Two
Fair Value of Financial Instruments
Fair Value Disclosures [Text Block]
Earliest Tax Year [Member]
Represents Dynamic Cell Therapies, Inc.
Dynamic Cell Therapies, Inc. [Member]
Represents information regarding the warrants included in the December 11, 2020 offering and exercise of related overallotment option.
The 2020 Liability Warrants [Member]
Summary of Accrued Expenses
Schedule of Payroll Liabilities
Schedule of Accrued Liabilities [Table Text Block]
Noncash Investing and Financing Items [Abstract]
Represents information regarding Series C convertible preferred stock.
Series C Convertible Preferred Stock [Member]
Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration]
Plan Name [Domain]
Going Concern [Abstract]
Going concern.
Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Text Block]
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Compensated Absences
Accrued vacation
Cybersecurity Risk Management Expertise of Management Responsible [Text Block]
Outstanding Warrants to Purchase Shares
Class of warrant or right, outstanding
Class of Warrant or Right, Outstanding
Tax Period [Axis]
Stockholders' Equity [Table]
Stockholders' equity.
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount
Other
Foreign Tax Jurisdiction [Member]
Foreign Tax Authority [Member]
Accounting Standards Update [Extensible Enumeration]
Entity Address, City or Town
Security Exchange Name
Other
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent
Represents information about series A junior participating preferred stock.
Series A Junior Participating Preferred Stock [Member]
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest
Loss before income taxes
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number
Number of Underlying Shares,Vested and expected to vest
Measurement Input Type [Domain]
Antidilutive Securities, Name [Domain]
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent
Statutory tax rate difference between Australia and U.S.
Deferred Tax Assets, Goodwill and Intangible Assets
Intangible assets, net
Number of warrants or rights expired.
atos_ClassOfWarrantOrRightWarrantsExpired
Class of warrant or right, warrants expired
Statistical Measurement [Domain]
Assets, Current
Total current assets
Share-Based Payment Arrangement, Expense
Total stock-based compensation expense
Period End Date
Document Period End Date
Equity Method Investments and Joint Ventures [Abstract]
Fair Value Hierarchy and NAV [Domain]
Defined contribution plan, cost
Defined Contribution Plan, Cost
ICFR Auditor Attestation Flag
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number
Number of Underlying Shares, Exercisable
Accrued vacation
Accrued Vacation, Current
Accrued payroll and benefits
Accrued Salaries, Current
Statement of Financial Position [Abstract]
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal
Loss on disposal of assets
Antidilutive Security, Excluded EPS Calculation [Table]
RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation [Abstract]
Class of Stock [Axis]
Cybersecurity Risk Management, Strategy, and Governance [Line Items]
Warrants and Rights Outstanding, Maturity Date
Expiration date
Prepaid expenses and other current assets.
Prepaid Expenses and Other Current Assets
Prepaid Expenses and Other Current Assets [Text Block]
Share Repurchases [Member]
Share Repurchase Program [Member]
Share repurchase program.
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent
Effect of changes in tax laws or rates enacted in the current period
Liabilities
Total Liabilities
Going Concern [Text Block]
Going Concern.
Going Concern
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period
Contractual term
Foreign rate differential
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount
Statutory tax rate difference between Australia and U.S.
Preferred stock, convertible, ownership percentage of shares allowed
Represents the maximum ownership percentage of company’s shares allowed for holder of convertible preferred stock to be able to convert their shares.
atos_PreferredStockConvertibleOwnershipPercentageOfCompanysSharesAllowed
Weighted average shares outstanding used to compute net loss per share - diluted (in shares)
Weighted average common shares outstanding used to compute net loss per share, diluted (in shares)
Weighted Average Number of Shares Outstanding, Diluted
Weighted Average Number of Shares Outstanding, Diluted, Total
Entity File Number
Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to non-taxable R&D rebate.
atos_EffectiveIncomeTaxRateReconciliationNontaxableRdRebateAmount
Non-taxable R&D rebate
Accounting Standards Update 2023-07 [Member]
ASU 2023-07 [Member]
Expected volatility, Minimum
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum
Measurement Input Type [Axis]
Prepaid expenses and other current assets
Prepaid Expense and Other Assets, Current
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3
Reclassification of equity upon adoption of accounting standard
Stockholders' Equity [Line Items]
Stockholders' equity.
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized
Common stock shares reserved for issuance
Number of operating segments
Number of Operating Segments
Sale of Stock [Domain]
Segment Reporting Disclosure [Text Block]
Segments
General and administrative expenses
General and Administrative Expense, Total
General and administrative
General and Administrative Expense
Series B Preferred Stock [Member]
Preferred stock, convertible, conversion price
Preferred Stock, Convertible, Conversion Price
Subsequent Event [Table]
Rebate reserve
Deferred Tax Assets Tax Rebate Reserve
Deferred tax assets tax rebate reserve.
Deferred Tax Assets, Other
Other
Consummate a business combination, percentage of aggregate ordinary voting power
Represents the percentage of aggregate ordinary voting power of third party when company consummates a business combination.
atos_ConsummateABusinessCombinationPercentageOfAggregateOrdinaryVotingPower
Payments to acquire equity securities without readily determinable fair value
Amount of cash outflow to acquire investment in equity security without readily determinable fair value.
atos_PaymentsToAcquireEquitySecuritiesWithoutReadilyDeterminableFairValue
Purchase of investment in equity securities
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount
Effect of changes in tax laws or rates enacted in the current period
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price
Weighted-Average Exercise Price Per Share, Vested and expected to vest
New Accounting Pronouncements, Policy [Policy Text Block]
Recently Issued and Adopted Accounting Pronouncements
Impairment charge on investment in equity securities
Impairment charge on investment in equity securities
Equity securities without readily determinable fair Value, impairment loss, annual amount
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Issuance of common stock upon Series B preferred stock conversion (in shares)
Stock Issued During Period, Shares, Conversion of Convertible Securities
Other non-taxable income & disallowed expenses
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Percent
Other non-taxable income & disallowed expenses
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period
Vesting term
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum
Risk-free interest rate, Minimum
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]
Amount
Depreciation
Depreciation
Depreciation, Total
Amount before allocation of valuation allowances of deferred tax asset attributable to capitalized research and development.
Capitalized R&D expenses
Common stock, outstanding (in shares)
Common Stock, Shares, Outstanding, Ending Balance
Common Stock, Shares, Outstanding, Beginning Balance
Common Stock, Shares, Outstanding
Cybersecurity Risk Management Processes Integrated [Flag]
Document Transition Report
Deferred Tax Assets, Net
Net deferred tax asset
Unrecorded Unconditional Purchase Obligation by Category of Item Purchased [Axis]
Operating Expenses
Total operating expenses
Research and development
Research and development expense, total
Research and Development Expense
Convertible Preferred Stock
Convertible Preferred Stock [Member]
Statement of Cash Flows [Abstract]
Prepaid materials
Prepaid Materials
Prepaid materials.
Stock Issued During Period, Value, New Issues
Issuance of common stock upon warrant exercise
Schedule of Option Activity for Share-Based Payment Arrangement
Share-Based Payment Arrangement, Option, Activity [Table Text Block]
Payroll Liabilities
Payroll Liabilities Disclosure [Text Block]
Payroll Liabilities Disclosure.
Stockholders' Equity
Equity [Text Block]
Net Loss Per Share
Earnings Per Share [Text Block]
Cybersecurity Risk Management Processes Integrated [Text Block]
Net loss
Net loss
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Intrinsic Value
Aggregate Intrinsic Value, Outstanding
Represents information regarding warrants associated with the 2020 offering consisting of common stock and warrants.
Warrants Associated with 2020 Offering Consisting of Common Stock and Warrants [Member]
Assumption of dividend yield
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate
Assets
Assets [Abstract]
Research and Development Arrangement [Member]
Prepaid expenses and other current assets
Prepaid expenses and other current assets
Increase (Decrease) in Prepaid Expense and Other Assets
Document Fiscal Year Focus
CASH FLOWS FROM INVESTING ACTIVITIES
Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract]
Accounts payable
Accounts Payable, Current, Total
Accounts Payable, Current
Research and development
Research and Development Expense [Member]
Defined contribution plan, employer matching contribution, percent of match
Defined Contribution Plan, Employer Matching Contribution, Percent of Match
Increase (Decrease) in Other Noncurrent Assets
Other assets
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]
Schedule of Prepaid Expenses and Other Current Assets
Stock-based compensation
Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture
Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture, Total
Stock Conversion Description [Axis]
Fair Value Measurements
Fair Value Measurement, Policy [Policy Text Block]
Represents the amount of issuance costs recognized in connection with the issuance of common stock associated with warrants (along with such warrants) during the period.
Issuance of common stock and warrants, issuance costs
Fair Value Disclosures [Abstract]
Commitments and Contingencies Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, Tax Credit, Amount
Effective Income Tax Rate Reconciliation, Tax Credit, Amount, Total
Tax credits
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent [Abstract]
Foreign income tax rate differential percent.
Foreign tax effects
Effective Income Tax Rate Reconciliation [Line Items]
Share-Based Payment Arrangement [Abstract]
Sale of Stock [Axis]
Section 481(a) adjustment bonus compensation.
Section 481(a) adjustment - bonus compensation
Section 481(a) Adjustment Bonus Compensation
Cash Provided by (Used in) Investing Activity, Including Discontinued Operation
Net cash used in investing activities
Deferred Tax Liabilities, Bonus Compensation
Amount of deferred tax liability attributable to taxable temporary differences from bonus compensation.
Bonus compensation
Title of 12(b) Security
Deferred tax liabilities
Deferred Tax Liabilities, Net [Abstract]
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-Based Payment Arrangement, Amount
Stock-based compensation
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price
Weighted-Average Exercise Price Per Share, Forfeited
Money Market Funds [Member]
Income Tax Disclosure [Text Block]
Income Taxes
Represents information regarding the 2020 warrants.
The 2020 Warrants [Member]
Non-taxable income and disallowed expenses
Effective Income Tax Rate Reconciliation Non-taxable Income and Disallowed Expenses
Effective income tax rate reconciliation non-taxable income and disallowed expenses.
Document Information
Document Information [Table]
At The Market Offering [Member]
At the market offering.
At the Market Offering [Member]
Changes in operating assets and liabilities:
Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price
Weighted-Average Exercise Price Per Share, Outstanding
Weighted-Average Exercise Price Per Share, Outstanding
Income Tax Disclosure [Abstract]
Unrecognized tax benefits, ending balance
Unrecognized Tax Benefits, Ending Balance
Unrecognized Tax Benefits, Beginning Balance
Unrecognized Tax Benefits
Additional Paid-in Capital [Member]
Measurement Input Probability [Member]
Measurement Input Probability.
Measurement Frequency [Domain]
Statement of Income Location, Balance [Axis]
Change in Accounting Principle, Accounting Standards Update, Adoption Date
Trading Symbol
Risk-free interest rate, Maximum
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum
Stock or Unit Option Plan Expense
Compensation cost for stock options granted
Subsequent Event Type [Axis]
Payroll liabilities
Employee-related Liabilities, Current
Total payroll liabilities
CASH FLOWS FROM FINANCING ACTIVITIES
Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract]
Expected term (in years)
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term
Fair Value, Recurring [Member]
Schedule of Equity Method Investments [Line Items]
Conversion of Stock, Name [Domain]
Equity Components [Axis]
Equity Component [Domain]
Asset Class [Axis]
March 2021 Warrants [Member]
March Two Zero Two One Warrants Member
March 2021 Warrants.
Document Annual Report
Increase (Decrease) in Other Current Assets
Other current assets
Prepaid insurance
Prepaid Insurance
Changes in unrecognized tax benefits
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount, Total
Maximum [Member]
Maximum [Member]
Maximum
Statistical Measurement [Axis]
Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price
Weighted-Average Exercise Price Per Share, Exercised
Prepaid expenses
Prepaid Expense, Current
Total prepaid expenses
Common Stock, Value, Issued
Common stock - $0.18 par value; 350,000,000 shares authorized 8,611,361 and 8,611,266 shares issued and outstanding as of December 31, 2025 and 2024
Represents warrant liability.
Warrant Liability [Member]
Net operating loss carryforwards
Deferred Tax Assets, Operating Loss Carryforwards, Total
Deferred Tax Assets, Operating Loss Carryforwards
Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent
State income taxes, net of federal income tax effect
Schedule of Payroll Liabilities
Schedule Of Payroll Liabilities [Table Text Block]
Schedule Of Payroll Liabilities.
Entity Public Float
Preferred stock, shares authorized
Preferred stock, authorized (in shares)
Preferred Stock, Shares Authorized
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Effective Income Tax Rate Reconciliation, Cross-Border Tax Effect, Percent
Effective Income Tax Rate Reconciliation, Cross-Border Tax Effect, Percent, Total
Effect of cross border tax laws
Registrant Name
Entity Registrant Name
Unrecognized tax benefits, income tax penalties and interest accrued, total
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued
Entity Voluntary Filers
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Represents information regarding warrants in connection with the 2021 financing transaction.
The 2021 Financing Transaction Warrants [Member]
Common stock repurchased, shares
Common stock repurchased, shares
Treasury Stock, Shares, Acquired
Other expense, net
Other Nonoperating Income (Expense), Total
Other Nonoperating Income (Expense)
Additional paid-in capital
Additional Paid in Capital
Conversion of Stock, Shares Issued
Conversion of Stock, Shares Issued
Subsequent Events [Abstract]
Cybersecurity Risk Management Positions or Committees Responsible [Flag]
Income taxes benefit
Income tax benefit
Income tax expense (benefit), total
Income Tax Expense (Benefit)
Measurement Frequency [Axis]
Valuation Dynamic Options Approach [Member]
Valuation Dynamic Options Approach.
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Entity Common Stock, Shares Outstanding
Concentration of Credit Risk
Concentration Risk, Credit Risk, Policy [Policy Text Block]
Liability Class [Axis]
Equity securities without readily determinable fair value, measurement input
Equity Securities Without Readily Determinable Fair Value Measurement Input
Equity securities without readily determinable fair value measurement input.
Purchase of property and equipment
Payments to Acquire Property, Plant, and Equipment, Total
Payments to Acquire Property, Plant, and Equipment
Assets
Total Assets
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term
Weighted-Average Contractual Life Remaining in Years, Exercisable
Income Statement [Abstract]
Stock-based Compensation
Share-Based Payment Arrangement [Policy Text Block]
Shares withheld related to cashless exercise of options and taxes
Represents the value of stock redeemed or called during period for stock option or taxes.
Shares withheld related to cashless exercise of options and taxes
Stock Issued During Period, Shares, New Issues
Issuance of common stock upon warrant exercise (in shares)
Number of shares issued in transaction
Net loss per share of common stock - diluted (in dollars per share)
Net loss per share of common stock, diluted (in dollars per share)
Earnings Per Share, Diluted
Earnings Per Share, Diluted, Total
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Percent
City Area Code
Auditor Name
Restricted cash
Restricted Cash and Cash Equivalents, Current, Total
Restricted Cash and Cash Equivalent, Current
Stockholders' Equity Note, Stock Split, Conversion Ratio
Reverse stock split ratio
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Cash and Cash Equivalents
Cash and Cash Equivalents, Policy [Policy Text Block]
Investment in Equity Securities
The entire disclosure for investments in non-marketable equity securities.
Investments in Non-marketable Equity Securities Disclosure [Text Block]
Total cash, cash equivalents and restricted cash
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Including Discontinued Operation
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, ENDING BALANCE
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING BALANCE
Operating Income (Loss)
Operating loss
Retained Earnings [Member]
Accumulated Deficit [Member]
Stock-based compensation
Share-Based Payment Arrangement, Noncash Expense
Share-Based Payment Arrangement, Noncash Expense, Total
Represents information about series B convertible preferred stock.
Series B Convertible Preferred Stock [Member]
Fair Value, Inputs, Level 1 [Member]
Cash Provided by (Used in) Financing Activity, Including Discontinued Operation
Net cash provided by financing activities
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent [Abstract]
Non taxable or non deductible items
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]
Auditor Location
Schedule of Stockholders' Equity Note, Warrants or Rights
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
Gross net operating loss carryforwards
Amount of gross net operating loss carryforward available to reduce future taxable income under enacted tax laws.
atos_GrossNetOperatingLossCarryforwards
Schedule of Antidilutive Securities
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
Income Tax Jurisdiction [Domain]
Entity Interactive Data Current
Statement of Income Location, Balance [Domain]
CASH FLOWS FROM OPERATING ACTIVITIES
Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings
Change in fair value
Valuation of Other Investments
Valuation of other investments.
Variable Interest Entities
Entity Tax Identification Number
Estimated non-cancellable commitment
Estimated non-cancellable commitment.
Represents January 2021 warrants.
The January 2021 Warrants [Member]
Local Phone Number
Other current liabilities
Other Liabilities, Current
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount
Unrecognized total compensation cost
Auditor Opinion [Text Block]
Represents the 2020 stock incentive plan.
The 2020 Stock Incentive Plan [Member]
Accounting Policies [Abstract]
Class of Stock [Domain]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition
Unrecognized total compensation cost, weighted-average period
Accrued professional services and other
Accrued Professional Fees, Current
Entity Emerging Growth Company
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term
Weighted-Average Contractual Life Remaining in Years, Vested and expected to vest
Chairman, President and Chief Executive Officer [Member]
Chairman, President and Chief Executive Officer.