Number of outstanding warrants subject to non-market performance condition (in shares) Number Of Warrants Outstanding Subject To Non-Market Performance Condition Number Of Warrants Outstanding Subject To Non-Market Performance Condition Disclosure of geographical areas [line items] Disclosure of geographical areas [line items] Borrowings, exit fee amount Borrowings, Exit Fee Amount Borrowings, Exit Fee Amount Employee-related receivables Current Receivables for Employee Benefits Current Receivables for Employee Benefits Acquisitions of property, plant and equipment Purchase of property, plant and equipment, classified as investing activities Sub-contracting, studies and research Sub-Contracting, Studies And Research Expenses Sub-Contracting, Studies And Research Expenses Number of warrants exercised (in shares) Number Of Warrants Exercised Number Of Warrants Exercised Entity Listings, Exchange [Axis] Entity Listings, Exchange [Axis] Proportion of ownership interests held by non-controlling interests Proportion of ownership interests held by non-controlling interests Number of shares waived (in shares) Number Of Shares Waived Number Of Shares Waived Entity File Number Entity File Number Impairment loss recognised in profit or loss, intangible assets other than goodwill Impairment loss recognised in profit or loss, intangible assets other than goodwill Other financial income Other finance income Disclosure of reconciliation of intangible assets Disclosure of detailed information about intangible assets [text block] Appropriation of prior period net loss Increase (decrease) through appropriation of retained earnings, equity Tax Year 2021 2021, Tax Year [Member] Tax Year 2021 Net defined benefit liability (asset) [axis] Net defined benefit liability (asset) [axis] Cash and cash equivalents [abstract] Disclosure of reconciliation of liabilities arising from financing activities Disclosure of reconciliation of liabilities arising from financing activities [text block] BSA-2018-1 BSA-2018-1 [Member] BSA-2018-1 Other Other tax effects for reconciliation between accounting profit and tax expense (income) CIR Tax Effect Of Research Tax Credit Tax Effect Of Research Tax Credit Kreos & Claret minimal return indemnifications Kreos/Claret Minimal Return Indemnifications Kreos & Claret Minimum Return Indemnifications [Member] Kreos & Claret Minimum Return Indemnifications BCE-2018-5 BCE-2018-5 [Member] BCE-2018-5 Financial gain (loss) Finance income (cost) Disclosure of detailed information about borrowings [table] Disclosure of detailed information about borrowings [table] Number of instruments exercised (in shares) Number of other equity instruments exercised or vested in share-based payment arrangement Kreos/Claret bond loans Kreos & Claret bond loans [Member] Kreos & Claret bond loans Payables to related parties Payables to related parties Statement of comprehensive income [abstract] Statement of changes in equity [line items] Statement of changes in equity [line items] Reasonably possible change in risk variable, percent Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Change In Risk Variable, Percent Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Change In Risk Variable, Percent Income from government grants Subsidies Income from government grants Net loss for the period Retained earnings, profit (loss) for reporting period Revaluation of cash equivalents measured at fair value Revaluation Of Cash Equivalents Measured At Fair Value Revaluation Of Cash Equivalents Measured At Fair Value Number of instruments lapsed (in shares) Number of other equity instruments expired in share-based payment arrangement Increase (decrease) in carrying value due to reasonably possible increase in unobservable input liabilities Increase (Decrease) In Carrying Value Due To Reasonably Possible Increase In Unobservable Input Liabilities Increase (Decrease) In Carrying Value Due To Reasonably Possible Increase In Unobservable Input Liabilities Disclosure of geographical areas [table] Disclosure of geographical areas [table] Contribution to Group's liabilities, percentage Contribution To Group's Liabilities, Percentage Contribution To Group's Liabilities, Percentage Tax Year 2022 2022, Tax Year [Member] Tax Year 2022 Derivative instruments Current derivative financial liabilities ASSETS AT FAIR VALUE THROUGH PROFIT AND LOSS Financial assets at fair value through profit or loss, category [member] Statement of financial position [abstract] BCE-2017-2 BCE-2017-2 [Member] BCE-2017-2 Cover [Abstract] Maximum Maximum [Member] Proceeds from conditional advances Proceeds From Conditional Advances Proceeds From Conditional Advances Provisions Description of accounting policy for provisions [text block] Classes of intangible assets other than goodwill [axis] Classes of intangible assets other than goodwill [axis] Kreos & Claret convertible notes (OCABSA) Kreos/Claret BSA Kreos & Claret Financing, Tranche A [Member] Kreos & Claret Financing, Tranche A AGA-2024 AGA-2024 [Member] AGA-2024 BSA-2025-3 BSA-2025-3 [Member] BSA-2025-3 Increase (decrease) in Crohn's Disease research expenses Increase (Decrease) In Crohn's Disease Research Expenses Increase (Decrease) In Crohn's Disease Research Expenses Entity Shell Company Entity Shell Company Premiums related to share capital Share premium Cash flows provided by (used in) financing activities Cash flows from (used in) financing activities [abstract] AGA-2025-8 AGA-2025-8 [Member] AGA-2025-8 Share warrants, subscription price (in euro per share) Share Warrants, Subscription Price Per Share Share Warrants, Subscription Price Per Share Classes of liabilities [domain] Classes of liabilities [domain] Actuarial gains and losses Decrease (increase) in net defined benefit liability (asset) resulting from gain (loss) on remeasurement in other comprehensive income Borrowings, maturity term Borrowings Maturity, Term Borrowings Maturity, Term Settlement in shares, percentage of fair market value Convertible Loans Notes, Settlement In Shares, Percentage Of Fair Market Value Convertible Loans Notes, Settlement In Shares, Percentage Of Fair Market Value Equity issuance, percentage of current share capital Equity Issuance, Percentage Of Current Share Capital Equity Issuance, Percentage Of Current Share Capital Total comprehensive income (loss) for the period Comprehensive income Sale Of Stock [Domain] Sale Of Stock [Domain] Sale Of Stock [Domain] Research tax credit ("CIR") Income From Research Tax Credit Income From Research Tax Credit Interest paid Decrease Through Interest Paid, Liabilities Arising From Financing Activities Decrease Through Interest Paid, Liabilities Arising From Financing Activities Disclosure of changes in projected benefit obligation Disclosure of net defined benefit liability (asset) [text block] Basis of preparation Disclosure of basis of preparation of financial statements [text block] Number of convertible notes issued (in shares) Number Of Convertible Notes Issued Number Of Convertible Notes Issued Royalty certificate, maximum amount Royalty Certificate, Maximum Amount Royalty Certificate, Maximum Amount AGA-2024-5 AGA-2024-5 [Member] AGA-2024-5 Deposits Short-term deposits, not classified as cash equivalents Share price (euro per share) Share Price1 Share Price1 Research and development expenses Research And Development Expenses [Member] Research And Development Expenses Document Fiscal Period Focus Document Fiscal Period Focus Proceeds from the issuance of non-convertible bond loans Gross Proceeds From Non-Convertible Loans Notes Gross Proceeds From Non-Convertible Loans Notes TOTAL ASSETS Financial assets Assets Assets Forgiveness of conditional advances Adjustments For Forgiveness Of Conditional Advances Adjustments For Forgiveness Of Conditional Advances Unrecognized deferred tax assets Unrecognized Deferred Tax Assets Unrecognized Deferred Tax Assets Current taxes Description of accounting policy for income tax [text block] Number of instruments outstanding, beginning balance (in shares) Number of instruments outstanding, ending balance (in shares) Number of other equity instruments outstanding in share-based payment arrangement Goodwill Description of accounting policy for goodwill [text block] Credit risk Credit risk [member] Trading Symbol Trading Symbol Types of interest rates [axis] Types of interest rates [axis] Loss on derecognition of financial liabilities Losses Arising From Derecognition Of Financial Liabilities Losses Arising From Derecognition Of Financial Liabilities Potential development milestone payment, IND approval Collaboration Agreements, Potential Development Milestone Payment, IND Approval Collaboration Agreements, Potential Development Milestone Payment, IND Approval Entity Address, City or Town Entity Address, City or Town Probability-weighted present value of shortfall payment, final redemption Final Redemption, Probability-Weighted Present Value Of Shortfall Payment, Measurement Input [Member] Final Redemption,Probability-Weighted Present Value Of Shortfall Payment, Measurement Input Disclosure of conditional advances Disclosure of borrowings [text block] SHARE CAPITAL Issued capital [member] Employees Disclosure of information about employees [text block] Lease facilities, Montpellier Lease Facilities, Montpellier [Member] Lease Facilities, Montpellier Kreos & Claret financing, tranche B and C Kreos & Claret Financing, Tranche B and C [Member] Kreos & Claret Financing, Tranche B and C Lease, break clause period Lease, Break Clause Period Lease, Break Clause Period Disclosure of quantitative information about right-of-use assets [table] Disclosure of quantitative information about right-of-use assets [table] Entity Emerging Growth Company Entity Emerging Growth Company Number of warrants repurchased (in shares) Number Of Warrants Repurchased Number Of Warrants Repurchased Increase (decrease) in number of ordinary shares issued (in shares) Increase (decrease) in number of ordinary shares issued Advances related to CRO contracts Current Advances To CRO Contracts Current Advances To CRO Contracts The Group Disclosure of general information about financial statements [text block] Increase (decrease) through amortization cost remeasurement Non-cash changes: amortized cost remeasurement Increase (Decrease) Through Amortization Cost Remeasurement, Liabilities Arising From Financing Activities Increase (Decrease) Through Amortization Cost Remeasurement, Liabilities Arising From Financing Activities Final redemption, probability-weighted fair value without MRI Final Redemption, Probability-Weighted Fair Value Without MRI , Measurement Input [Member] Final Redemption, Probability-Weighted Fair Value Without MRI , Measurement Input Other non-current assets Total other non-current assets Other non-current non-financial assets Nominal income tax using statutory French tax rate Tax expense (income) at applicable tax rate Chief Executive Officer Chief Executive Officer [Member] Tax Year 2023 2023, Tax Year [Member] Tax Year 2023 Depositary service fees Income From Depositary Service Fees Income From Depositary Service Fees Prepaid expenses Current prepaid expenses ASSETS Assets [abstract] AGA-2024-1, AGE-2024-2, AGA-2024-3, AGA-2024-4, AGA-2024-5 and AGA-2024-7 AGA-2024-1, AGE-2024-2, AGA-2024-3, AGA-2024-4, AGA-2024-5 and AGA-2024-7 [Member] AGA-2024-1, AGE-2024-2, AGA-2024-3, AGA-2024-4, AGA-2024-5 and AGA-2024-7 RNP-VIR conditional advance and CARENA conditional advance RNP-VIR Conditional Advance, BPI And CARENA Conditional Advance, BPI [Member] RNP-VIR Conditional Advance, BPI And CARENA Conditional Advance, BPI American Depositary Shares, each representing one ordinary share, nominal value €0.01 per share American Depository Shares, NASDAQ Global Market [Member] American Depository Shares, NASDAQ Global Select Market [Member] ROU Right-of-use assets [member] Credit spread Credit spread, measurement input [member] Retained earnings Retained earnings, excluding profit (loss) for reporting period Registered direct offering Registered Direct Offering [Member] Registered Direct Offering Current assets Current assets [abstract] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Revenue [abstract] Non-current assets Non-current assets [abstract] Kreos A & B BSA Kreos A & B BSA [Member] Kreos A & B BSA All other fees Auditor's remuneration for other services Acquisition Additions other than through business combinations, property, plant and equipment including right-of-use assets General and administrative General and administrative expense Increase (decrease) in transversal activities Increase (Decrease) In Transversal Activities Increase (Decrease) In Transversal Activities Income tax Disclosure of income tax [text block] Payments for share issue costs Payments for share issue costs Disclosure of defined benefit plans [abstract] Disclosure of defined benefit plans [abstract] Early redemption amount (put event) Early Redemption Amount, Measurement Input [Member] Early Redemption Amount, Measurement Input Disclosure of other receivables and other assets Disclosure Of Detailed Information About Other Receivables And Other Assets [Table Text Block] Disclosure Of Detailed Information About Other Receivables And Other Assets Interest paid Interest paid, classified as financing activities Expense relating to short-term leases Expense Relating To Short-Term Leases And Low Value Assets For Which Recognition Exemption Has Been Used Expense Relating To Short-Term Leases And Low Value Assets For Which Recognition Exemption Has Been Used Interest on royalty certificates Interest Expense On Royalty Certificates Interest Expense On Royalty Certificates Initial price limit (in euro per share) Initial Price Limit, Measurement Input [Member] Initial Price Limit, Measurement Input Foreign exchange losses Foreign exchange loss Foreign exchange loss SOFTWARE Computer software [member] Convertible loan notes, nominal value Convertible Loans Notes, Nominal Value Convertible Loans Notes, Nominal Value Number of outstanding warrants (in shares) Number Of Warrants Outstanding Number Of Warrants Outstanding Cash Cash Related party transactions [abstract] Related party transactions [abstract] Convertible loan notes Convertible Loans Notes [Member] Convertible Loans Notes Potential development milestone payment, phase 3 Collaboration Agreements, Potential Development Milestone Payment, Phase 3 Collaboration Agreements, Potential Development Milestone Payment, Phase 3 FAIR VALUE OF THE BSA (in euro per share) FAIR VALUE OF THE AGA (in euro per share) Equity Instrument Fair Value, Other Equity Instruments Granted Equity Instrument Fair Value, Other Equity Instruments Granted Research and collaboration agreement with CNRS, University of Montpellier and Institut Curie Research And Collaboration Agreement With CNRS, University Of Montpellier And Institut Curie [Member] Research And Collaboration Agreement With CNRS, University Of Montpellier And Institut Curie Cash flows provided by (used in) investing activities Cash flows from (used in) investing activities [abstract] Disclosure Of Off-Balance Sheet Commitments [Line Items] Disclosure Of Off-Balance Sheet Commitments [Line Items] Disclosure Of Off-Balance Sheet Commitments [Line Items] Increase (decrease) in carrying value due to reasonably possible decrease in unobservable input liabilities Increase (Decrease) In Carrying Value Due To Reasonably Possible Decrease In Unobservable Input Liabilities Increase (Decrease) In Carrying Value Due To Reasonably Possible Decrease In Unobservable Input Liabilities AGA-2024-1 AGA-2024-1 [Member] AGA-2024-1 Borrowings maturity, extension term Borrowings Maturity, Extension Term Borrowings Maturity, Extension Term Cash and cash equivalents Description of accounting policy for determining components of cash and cash equivalents [text block] Equity issuance, cash carve-out Equity Issuance, Cash Carve-Out Equity Issuance, Cash Carve-Out Non-cash changes: conversion into shares Increase (Decrease) Through Conversion Into Shares, Liabilities Arising From Financing Activities Increase (Decrease) Through Conversion Into Shares, Liabilities Arising From Financing Activities Kreos & Claret financing, tranche A-B Kreos & Claret Financing, Tranche A-B [Member] Kreos & Claret Financing, Tranche A-B AGA-2023-3 AGA-2023-3 [Member] AGA-2023-3 Shares based compensation expense Increase (decrease) through share-based payment transactions, equity Reconciliation of number of shares outstanding [abstract] Reconciliation of number of shares outstanding [abstract] Decrease Decrease In Lease Liabilities Decrease In Lease Liabilities Entity Ex Transition Period Entity Ex Transition Period Convertible loan notes, number of separate closings Convertible Loans Notes, Number Of Separate Closings Convertible Loans Notes, Number Of Separate Closings Use of judgments and estimates Disclosure Of Accounting Policy For Accounting Judgements And Estimates Explanatory [Policy Text Block] Disclosure Of Accounting Policy For Accounting Judgements And Estimates Explanatory Foreign currency translation differences Other comprehensive income, net of tax, exchange differences on translation of foreign operations Total non-current assets Non-current assets Disclosure of maturity analysis for derivative financial liabilities [line items] Disclosure of maturity analysis for derivative financial liabilities [line items] AGA-2023-3 and AGA-2023-4 AGA-2023-3 And AGA-2023-4 [Member] AGA-2023-3 And AGA-2023-4 Share issue related cost Share issue related cost Disclosure of defined benefit plans [table] Disclosure of defined benefit plans [table] Remeasurement Period [Domain] Remeasurement Period [Domain] Remeasurement Period [Domain] Convertible loan notes Non-Current Convertible Loans Notes Non-Current Convertible Loans Notes Classes of property, plant and equipment [axis] Classes of property, plant and equipment [axis] Exercise of warrants Proceeds from exercise of warrants Cash-generating units [axis] Cash-generating units [axis] Classes of property, plant and equipment [domain] Classes of property, plant and equipment [domain] Disclosure Of Other Receivables And Other Assets [Table] Disclosure Of Other Receivables And Other Assets [Table] Disclosure Of Other Receivables And Other Assets [Table] Entity Address, Country Entity Address, Country Increase (decrease) in transversal activities, combination therapy Increase (Decrease) In Transversal Activities, Combination Therapy Increase (Decrease) In Transversal Activities, Combination Therapy Convertible loans notes, undiscounted cash flows Convertible Loans Notes, Undiscounted Cash Flows Convertible Loans Notes, Undiscounted Cash Flows Reconciliation of changes in intangible assets other than goodwill [abstract] Reconciliation of changes in intangible assets other than goodwill [abstract] Exercises of share warrants (in shares) Increase (Decrease) In Number Of Shares Issued Through Exercise Of Share Warrants Increase (Decrease) In Number Of Shares Issued Through Exercise Of Share Warrants Interest expense on royalty certificates, including the unwinding of discount Interest Expense On Royalty Certificates, Including The Unwinding Of Discount Interest Expense On Royalty Certificates, Including The Unwinding Of Discount Tranche C Tranche C [Member] Tranche C Convertible loan notes, period Convertible Loans Notes, Period Convertible Loans Notes, Period Effect of movements in exchange rates on cash held Effect of exchange rate changes on cash and cash equivalents Interest received Interest received, classified as investing activities Kreos 1, convertible bond loans Kreos 1, Convertible Bond Loans [Member] Kreos 1, Convertible Bond Loans Held to maturity / voluntary conversion scenario probability Voluntary Conversion Scenario Probability, Measurement Input [Member] Voluntary Conversion Scenario Probability, Measurement Input Translation of transactions denominated in foreign currency Description of accounting policy for foreign currency translation [text block] Foreign currency translation differences gains (loss) Foreign Exchange Gains (Losses) On Translation Of Foreign Operations Foreign Exchange Gains (Losses) On Translation Of Foreign Operations Payments for debt issue costs Payments for debt issue costs Deferred tax liabilities Deferred Tax Liabilities (Assets) Net of Unrecognized Liabilities (Assets) Deferred Tax Liabilities (Assets) Net of Unrecognized Liabilities (Assets) Document Annual Report Document Annual Report Entities [Table] Entities [Table] Royalty certificates, EIR Royalty Certificates, EIR Royalty Certificates, EIR Kreos & Claret financing Kreos & Claret Financing [Member] Kreos & Claret Financing BSA-2024-1 BSA-2024-1 [Member] BSA-2024-1 Disclosure of detailed information about financial instruments [table] Disclosure of detailed information about financial instruments [table] Geographical areas [domain] Geographical areas [domain] Disclosure of reconciliation of property, plant and equipment Disclosure of reconciliation of changes in property, plant and equipment, including right-of-use assets [text block] Borrowings, state guaranteed premium Borrowings, State Guaranteed Premium Borrowings, State Guaranteed Premium Management and assessment of financial risks Disclosure of financial risk management [text block] Entity Interactive Data Current Entity Interactive Data Current Favorable change in exchange rate, impact on foreign exchange gain Sensitivity Analysis For Types Of Market Risk, 10% Favorable Change in Exchange Rate, Impact On Foreign Exchange Gain (Loss) Sensitivity Analysis For Types Of Market Risk, 10% Favorable Change in Exchange Rate, Impact On Foreign Exchange Gain (Loss) Receivables due from related parties Receivables due from related parties Decrease in financial liabilities at fair value Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, liabilities Increase (decrease) in financial liabilities at fair value due to reasonably possible increase in unobservable input Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, liabilities Disclosure of attribution of expenses by nature to their function [line items] Disclosure of attribution of expenses by nature to their function [line items] Financial expenses Financial expenses Finance costs Disclosure of other financial assets Disclosure of financial assets [text block] Non-cash changes : subsidies Increase (Decrease) Through Subsidies, Liabilities Arising From Financing Activities Increase (Decrease) Through Subsidies, Liabilities Arising From Financing Activities Current and deferred taxes expenses Adjustments for income tax expense Disclosure of credit risk exposure [table] Disclosure of credit risk exposure [table] Accounting principles Disclosure of material accounting policy information [text block] Maximum drawdown capacity Other Financial Liabilities, Maximum Drawdown Capacity Other Financial Liabilities, Maximum Drawdown Capacity Early redemption amount, percentage of outstandong principal Convertible Loans Notes, Early Redemption Amount, Percentage Of Outstandong Principal Convertible Loans Notes, Early Redemption Amount, Percentage Of Outstandong Principal Lease, duration period Lease, Duration Period Lease, Duration Period Financial liabilities Description of accounting policy for financial liabilities [text block] Maximum drawdown capacity including interest Other Financial Liabilities, Maximum Drawdown Capacity Including Interest Other Financial Liabilities, Maximum Drawdown Capacity Including Interest Number of outstanding notes (in shares) Number Of Convertible Notes Outstanding Number Of Convertible Notes Outstanding AGA-2023-2 AGA-2023-2 [Member] AGA-2023-2 Adverse change in exchange rate, impact on foreign exchange loss Sensitivity Analysis For Types Of Market Risk, 10% Adverse Change in Exchange Rate, Impact On Foreign Exchange Gain (Loss) Sensitivity Analysis For Types Of Market Risk, 10% Adverse Change in Exchange Rate, Impact On Foreign Exchange Gain (Loss) Entity Central Index Key Entity Central Index Key Reclassification of prepaid expenses to carrying value of debt component Reclassification of Prepaid Expenses to Carrying Value of Debt Component Reclassification of Prepaid Expenses to Carrying Value of Debt Component Items that are or may be reclassified subsequently to profit or loss Other comprehensive income that will be reclassified to profit or loss, net of tax Cash and cash equivalents Disclosure of cash and cash equivalents [text block] Prepaid expenses - non current Non-Current Prepaid Expenses Non-Current Prepaid Expenses Consulting and professional fees Professional fees expense Valuation techniques used in fair value measurement [axis] Valuation techniques used in fair value measurement [axis] Increase in deposits Cash Payments For Deposits Cash Payments For Deposits Number of instruments granted, remaining percentage exercisable Number Of Instruments Granted, Other Equity Instruments, Remaining Percentage Exercisable Number Of Instruments Granted, Other Equity Instruments, Remaining Percentage Exercisable Interest on convertible loan notes Interest expense on debt instruments issued Kreos B BSA Kreos B BSA [Member] Kreos B BSA Proceeds from borrowings, net of refinancing of existing indebteness Proceeds From Borrowings, Net Of Refinancing Of Existing Indebteness Proceeds From Borrowings, Net Of Refinancing Of Existing Indebteness Disclosure of average workforce during the periods Disclosure Of Average Number Of Employees [Table Text Block] Disclosure Of Average Number Of Employees Deferred taxes Description of accounting policy for deferred income tax [text block] LIABILITIES AND SHAREHOLDERS' EQUITY Equity and liabilities [abstract] Proceeds from government grants Proceeds from government grants, classified as financing activities Repayment period Other Financial Liabilities, Repayment Period Other Financial Liabilities, Repayment Period Reconciliation of changes in property, plant and equipment [abstract] Reconciliation of changes in property, plant and equipment [abstract] Entity Filer Category Entity Filer Category Discounted cash flow Discounted cash flow [member] Expected proceeds from share issuance Expected Proceeds From Share Issuance Expected Proceeds From Share Issuance FROM 2 TO 5 YEARS Later than two years and not later than five years [member] Interest cost Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income) Other share warrants, subscripion price per share (in euro per share) Other Share Warrants, Subscription Price Per Share Other Share Warrants, Subscription Price Per Share BCE-2018-1 BCE-2018-1 [Member] BCE-2018-1 Operating loss Profit (loss) from operating activities Royalty certificates, undiscounted cash flows Royalty Certificates, Undiscounted Cash Flows Royalty Certificates, Undiscounted Cash Flows Intangible assets with indefinite useful life Intangible assets with indefinite useful life Audit fees Auditor's remuneration for audit services Long-term advances made to CROs Non-Current Advances To CRO Contracts [Member] Non-Current Advances To CRO Contracts Percentage of reasonably possible decrease in unobservable input, liabilities Percentage of reasonably possible decrease in unobservable input, liabilities Entity Address, Address Line One Entity Address, Address Line One Fair Value Measurement [Abstract] Fair Value Measurement [Abstract] Issuance Issuance Of Derivative Instruments Issuance Of Derivative Instruments Retirement benefit obligations Adjustments for increase (decrease) in employee benefit liabilities Conditional advances Bpifrance Banque Publique d’Investissement (BPI) [Member] Banque Publique d’Investissement (BPI) Disclosure of breakdown of the compensation expenses Explanation of effect of share-based payments on entity's profit or loss [text block] Number of operating segments Number of Operating Segment Number of Operating Segment Statement of cash flows [abstract] Disclosure of financial assets [table] Disclosure of financial assets [table] Maximum number of shares to be issued if all conditions are met (in shares) Maximum Number Of Other Equity Instruments To Be Issued In Share-Based Payment Arrangement If All Conditions Are Met Maximum Number Of Other Equity Instruments To Be Issued In Share-Based Payment Arrangement If All Conditions Are Met Title and Position [Domain] Title and Position [Domain] Number of instruments exercisable (in shares) Number of other equity instruments exercisable in share-based payment arrangement Transaction costs Transaction Costs Transaction Costs Counterparty Name [Domain] Counterparty Name [Domain] Disclosure Of Off-Balance Sheet Commitments [Table] Disclosure Of Off-Balance Sheet Commitments [Table] Disclosure Of Off-Balance Sheet Commitments [Table] Number of shares issued (in shares) Number Of Share Warrants Issued Number Of Share Warrants Issued Tax rates in foreign jurisdictions Tax effect of foreign tax rates BSA-2025-2 BSA-2025-2 [Member] BSA-2025-2 Transaction costs related to capital increase Tax Effect Of Transaction Costs Related To Capital Increase Tax Effect Of Transaction Costs Related To Capital Increase Current liabilities Current liabilities [abstract] Other financial assets Other Financial Assets [Member] Other Financial Assets Deposits Long-term deposits Borrowings, fixed conversion price (in euro per share) Borrowings, Fixed Conversion Price Borrowings, Fixed Conversion Price Proceeds from research tax credit Proceeds From Research Tax Credit Proceeds From Research Tax Credit Other tax and related payments Current Payables On Other Tax And Related Payments Current Payables On Other Tax And Related Payments Other financial liabilities Other current financial liabilities Disclosure of transactions between related parties [line items] Disclosure of transactions between related parties [line items] Net proceeds from convertible loan notes Net Proceeds From Convertible Loans Notes Net Proceeds From Convertible Loans Notes Tranches [Axis] Tranches [Axis] Tranches Classes of share capital [domain] Classes of share capital [domain] Salary increase rate Actuarial assumption of expected rates of salary increases Financial income Adjustments For Other Finance Income Adjustments For Other Finance Income Agreement, period Agreement, Period Agreement, Period Kreos C BSA Kreos C BSA [Member] Kreos C BSA Proceeds from issue of ordinary shares Proceeds from issue of ordinary shares Disclosure Of Operating Income [Line Items] Disclosure Of Operating Income [Line Items] Disclosure Of Operating Income [Line Items] Financial income Financial income Finance income Tranche B Tranche B [Member] Tranche B Classes of financial liabilities [axis] Classes of financial liabilities [axis] Classes of financial liabilities [domain] Classes of financial liabilities [domain] Document Shell Company Report Document Shell Company Report Interest expenses and other financial expenses Adjustments For Other Finance Costs Adjustments For Other Finance Costs Non-cash changes: recognition of earn-out liability Increase (Decrease) Through Recognition of Earn Out Liability, Liabilities Arising From Financing Activities Increase (Decrease) Through Recognition of Earn Out Liability, Liabilities Arising From Financing Activities Borrowings, adjustment to interest rate basis Borrowings, adjustment to interest rate basis Exercise price, percentage of 15-day WVAP Exercise Price, Percentage Of 15-Day WVAP, Other Equity Instruments Granted Exercise Price, Percentage Of 15-Day WVAP, Other Equity Instruments Granted BCE-2017-1 BCE-2017-1 [Member] BCE-2017-1 Issue of free shares (in shares) Number Of Free Shares Issued Number Of Free Shares Issued New standards, amendments and interpretations issued by IASB but not yet mandatory for financial years starting from January 1, 2023 Disclosure Of Accounting Policy For New Standards, Amendments And Interpretations Issued By IASB But Not Yet Mandatory [Policy Text Block] Disclosure Of Accounting Policy For New Standards, Amendments And For Financial Years Equity issuance, subscripion price per share (in euro per share) Equity Issuance, Subscription Price Per Share Equity Issuance, Subscription Price Per Share Average number of employees Average number of employees BCE-2018-4 BCE-2018-4 [Member] BCE-2018-4 Number of treasury shares held (in shares) Number Of Treasury Shares Held Number Of Treasury Shares Held Sale Of Stock [Axis] Sale Of Stock [Axis] Sale Of Stock Other receivables and assets Total current other receivables and assets Current Receivables And Current Prepaid Expenses Current Receivables And Current Prepaid Expenses Lease liabilities at beginning of period Lease liabilities at end of period Lease liabilities Lease liabilities Kreos 1, convertible bond loans, tranche B Kreos 1, Convertible Bond Loans, Tranche B [Member] Kreos 1, Convertible Bond Loans, Tranche B Disclosure of financial assets [abstract] Transactions on treasury shares Increase (decrease) through treasury share transactions, equity Employee Employee [Member] Employee Non-cash changes: interest expense and other Increase (decrease) through other changes, liabilities arising from financing activities Advances reimbursed by / (made to) CROs Payments For Advances Reimbursed (Made to) Contract Research Organizations Payments For Advances Reimbursed (Made to) Contract Research Organizations Discount Rate (IBoxx Corporates AA) Actuarial assumption of discount rates Lease liability, percentage of total Lease Liability, Percentage Of Total Lease Liability, Percentage Of Total AGA-2025-7 AGA-2025-7 [Member] AGA-2025-7 Off-Balance Sheet Commitments [Abstract] Off-Balance Sheet Commitments Minimum Minimum [Member] Liabilities arising from financing activities [domain] Liabilities arising from financing activities [domain] Principal Agreements [Axis] Principal Agreements [Axis] Principal Agreements Disclosure of reconciliation of other equity instruments Disclosure of number and weighted average exercise prices of other equity instruments [text block] CSO, settlement agreement CSO, Settlement Agreement [Member] CSO, Settlement Agreement Service period Vesting Requirements For Share-Based Payment Arrangement, Service Period Vesting Requirements For Share-Based Payment Arrangement, Service Period After 24 months After 24 Months [Member] After 24 Months Ordinary shares, nominal value €0.01 per share Ordinary Shares, NASDAQ Global Market [Member] Ordinary Shares, NASDAQ Global Market [Member] Share capital Issued capital Disclosure of reconciliation of liabilities arising from financing activities [line items] Disclosure of reconciliation of liabilities arising from financing activities [line items] Unused tax losses for which no deferred tax asset recognised Unused tax losses for which no deferred tax asset recognised Other intangible assets Other intangible assets [member] Categories of financial assets [axis] Categories of financial assets [axis] CIR Tax Year [Domain] CIR Tax Year [Domain] CIR Tax Year [Domain] Exercise price, share options granted (in euro per share) Exercise price, share options granted Issue of share warrants Increase (Decrease) Through Issuance of Warrants, Equity Increase (Decrease) Through Issuance of Warrants, Equity Increase / (decrease) in trade payables Adjustments for increase (decrease) in trade accounts payable Other items Other temporary differences [member] Total financial liabilities Financial liabilities Income tax Effective income tax (loss) Tax expense (income) Significant unobservable input, liabilities Significant unobservable input, liabilities Cash-generating units [domain] Cash-generating units [domain] Convertible loan notes Current Portion Of Non-Current Convertible Loans Notes Current Portion Of Non-Current Convertible Loans Notes Repayment of PGE Repayments Of PGE Repayments Of PGE Other Other Current Payables, Including Adjustments Other Current Payables, Including Adjustments Document Transition Report Document Transition Report Heights convertible notes, tranche B Heights Convertible Notes, Tranche B [Member] Heights Convertible Notes, Tranche B Cash flows provided by (used in) operating activities Cash flows from (used in) operating activities [abstract] Off-balance sheet commitments received and contingent assets Disclosure of other provisions, contingent liabilities and contingent assets [text block] Disclosure Of Fair Value Measurement Of Assets And Liabilities [Table] Disclosure Of Fair Value Measurement Of Assets And Liabilities [Table] Disclosure Of Fair Value Measurement Of Assets And Liabilities Dividend Expected Dividend, Measurement Input [Member] Expected Dividend, Measurement Input Disclosure of defined benefit plans [line items] Disclosure of defined benefit plans [line items] Document Period End Date Document Period End Date Non-adjusting events after reporting period [domain] Non-adjusting events after reporting period [domain] 7-year expiry scenario probability Expiry Scenario Probablity, Measurement Input [Member] Expiry Scenario Probablity, Measurement Input Disclosure of classes of share capital [line items] Disclosure of classes of share capital [line items] Collaboration agreements, development milestone payment, Phase 2 Collaboration Agreements, Development Milestone Payment, Phase 2 Collaboration Agreements, Development Milestone Payment, Phase 2 Kreos 1, non-convertible bond loans Kreos 1, Non-Convertible Bond Loans [Member] Kreos 1, Non-Convertible Bond Loans Goodwill and impairment test Disclosure of goodwill [text block] Deferred income Current deferred income other than current contract liabilities Effect of unwinding the discount related to advances made to CROs Unwinding Effect Of Discount Related To Advances Made To CROs Unwinding Effect Of Discount Related To Advances Made To CROs Maturity [axis] Maturity [axis] Other Other inflows (outflows) of cash, classified as financing activities Classes of financial instruments [axis] Classes of financial instruments [axis] Borrowings, early repayment, discount rate Borrowings, Early Repayment, Discount Rate Borrowings, Early Repayment, Discount Rate Goodwill Goodwill Leases Other Financial Liabilities [Member] Other Financial Liabilities BSA-2025-1 and BSA-2025-2 BSA-2025-1 And BSA-2025-2 [Member] BSA-2025-1 And BSA-2025-2 Document Type Document Type Gross lease liabilities Gross lease liabilities Other financial liabilities Other Financial Liabilities Related Temporary Differences [Member] Other Financial Liabilities Related Temporary Differences Accounting Principles [Abstract] Accounting Principles [Abstract] Accounting Principles [Abstract] Profit or loss [abstract] Statistical Measurement [Axis] Statistical Measurement [Axis] Disclosure of financial liabilities [abstract] Disclosure of financial liabilities [abstract] Patents Technology-Based Intangible Assets, Assets Acquisitions Technology-Based Intangible Assets, Assets Acquisitions Net proceeds from issue of ordinary shares Net Proceeds From Issue Of Ordinary Shares Net Proceeds From Issue Of Ordinary Shares Conversion of convertible instruments (in shares) Increase (Decrease) In Number Of Shares Issued Through Conversion Of Convertible Instruments Increase (Decrease) In Number Of Shares Issued Through Conversion Of Convertible Instruments Classes of assets [axis] Classes of assets [axis] Conditional advances, undiscounted cash flows Conditional Advances, Undiscounted Cash Flows Conditional Advances, Undiscounted Cash Flows Disclosure of changes in derivative instruments Disclosure Of Changes In Derivative Financial Instruments [Table Text Block] Disclosure Of Changes In Derivative Financial Instruments Types of share-based payment arrangements [domain] Types of share-based payment arrangements [domain] Other equity agreement Other Equity Agreements [Member] Other Equity Agreements Vesting period Vesting Requirements For Share-Based Payment Arrangement, Vesting Period Vesting Requirements For Share-Based Payment Arrangement, Vesting Period France FRANCE Loss per share (€/share) Earnings per share [abstract] Range [axis] Range [axis] Components of equity [axis] Components of equity [axis] Disclosure of financial liabilities breakdown Disclosure of financial liabilities [text block] Entity Information [Line Items] Entity Information [Line Items] Disclosure of financial liabilities [line items] Disclosure of financial liabilities [line items] Disclosure of principal audit fees and services Disclosure Of Principal Audit Fees And Services [Table Text Block] Disclosure Of Principal Audit Fees And Services Net loss before tax Profit (loss) before tax Annual revenue from sale of products developed, period Other Financial Liabilities, Annual Revenue From Sale Of Products Developed, Period Other Financial Liabilities, Annual Revenue From Sale Of Products Developed, Period After 18 months After 18 Months [Member] After 18 Months Conditional advances Conditional Advances Conditional Advances Shareholders’ equity Disclosure of share capital, reserves and other equity interest [text block] Other operating income Disclosure of other operating income [text block] Categories of related parties [domain] Categories of related parties [domain] Provisions Other non-current provisions Other non-current provisions Risk-free rate Risk-Free Interest Rate, Measurement Input [Member] Risk-Free Interest Rate, Measurement Input Percentage of reasonably possible increase in unobservable input, liabilities Percentage of reasonably possible increase in unobservable input, liabilities Classes of financial instruments [domain] Classes of financial instruments [domain] Effect of the change in foreign currency exchange rates Increase (decrease) through net exchange differences, property, plant and equipment including right-of-use assets Auditor Location Auditor Location ADS American Depository Shares [Member] American Depository Shares Market rate Market Rate, Measurement Input [Member] Market Rate, Measurement Input Number of shares (in shares) Number Of Shares per Share Warrant Number Of Shares per Share Warrant Total AGAs Free shares (AGA) AGAs Free Shares (AGA) [Member] Free Shares (AGA) Weighted average number of outstanding shares used for computing basic loss per share (in shares) Weighted average number of outstanding shares, basic loss per share (in shares) Weighted average number of ordinary shares used in calculating basic earnings per share Number of exclusive licenses Number Of Exclusive Licenses Number Of Exclusive Licenses Borrowings, maximum borrowing capacity Borrowings, Maximum Borrowing Capacity Borrowings, Maximum Borrowing Capacity Disclosure of deferred tax assets and liabilities by nature Disclosure of temporary difference, unused tax losses and unused tax credits [text block] Current advances to suppliers Current advances to suppliers Impairment loss recognised in profit or loss, goodwill Impairment loss recognised in profit or loss, goodwill Disclosure of detailed information about intangible assets [table] Disclosure of detailed information about intangible assets [table] Share-based payments Key management personnel compensation, share-based payment Disclosure of breakdown of trade and other payables Disclosure Of Breakdown Of Trade And Other Payables [Table Text Block] Disclosure Of Breakdown Of Trade And Other Payables Borrowings Borrowings Borrowings Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Disclosure Of Commitments Received [Line Items] Disclosure Of Commitments Received [Line Items] Disclosure Of Commitments Received [Line Items] Borrowings, market price, number of days with lowest daily VWAP Borrowings, Market Price, Number Of Days With Lowest Daily VWAP Borrowings, Market Price, Number Of Days With Lowest Daily VWAP Variable compensation owed Key Management Personnel Compensation, Variable Compensation Key Management Personnel Compensation, Variable Compensation Other financial assets Other financial assets Heights convertible notes, tranche A Heights Convertible Notes, Tranche A [Member] Heights Convertible Notes, Tranche A IT equipment Computer equipment [member] Increase (decrease) in cash and cash equivalents Increase (decrease) in cash and cash equivalents after effect of exchange rate changes Kreos A & B & C BSA Kreos A & B & C BSA [Member] Kreos A & B & C BSA Disclosure of information for cash-generating units [line items] Disclosure of information for cash-generating units [line items] Past services cost Increase (decrease) in net defined benefit liability (asset) resulting from past service cost Cash flows provided by (used in) financing activities Cash flows from (used in) financing activities Issue of equity, offering price per share (in dollar/euro per share) Issue Of Equity, Offering Price Per Share Issue Of Equity, Offering Price Per Share Number of shares lapsed (in shares) Number Of Shares Lapsed Number Of Shares Lapsed AMORTIZATION Accumulated depreciation, amortisation and impairment [member] Financial assets at amortized cost Description of accounting policy for financial assets [text block] Entity Current Reporting Status Entity Current Reporting Status Borrowings, market price, number of trading days Borrowings, Market Price, Number Of Trading Days Borrowings, Market Price, Number Of Trading Days AGA-2025 AGA-2025 [Member] AGA-2025 Statement of changes in equity [table] Statement of changes in equity [table] Key management personnel Key management personnel of entity or parent [member] OCEANE OCEANE [Member] OCEANE Changes in deferred income and other liabilities Adjustments For Increase (Decrease) In Deferred Income And Other Liabilities Adjustments For Increase (Decrease) In Deferred Income And Other Liabilities Number of shares with performance conditions waived (in shares) Number Of Shares With Performance Conditions Waived Number Of Shares With Performance Conditions Waived Probability of Drawdown of Tranche C credit facility Drawdown Probablity, Measurement Input [Member] Drawdown Probablity, Measurement Input Tax Year 2024 2024, Tax Year [Member] 2024, Tax Year Disclosure Of Warrants Arrangements [Table] Disclosure Of Warrants Arrangements [Table] Disclosure Of Warrants Arrangements Volatility Historical volatility for shares, measurement input [member] Cash and cash equivalents and other short-term investments Cash And Cash Equivalents And Other Short-Term Investments Cash And Cash Equivalents And Other Short-Term Investments Classes of assets [domain] Classes of assets [domain] Current Fiscal Year End Date Current Fiscal Year End Date Net proceeds from sale of royalty certificates Net Proceeds From Sale Of Royalty Certificates Net Proceeds From Sale Of Royalty Certificates Fair value of convertible notes Aggregate Fair Value, Convertible Notes Aggregate Fair Value, Convertible Notes Disclosure Of Lease Liabilities [Table] Disclosure Of Lease Liabilities [Table] Disclosure Of Lease Liabilities [Table] Cash equivalents Cash equivalents Bottom of range Bottom of range [member] Total deferred taxes, net recognized in the statement of financial position Net deferred tax liabilities Net Deferred Tax Assets (Liabilities) Recognised In Financial Position Net Deferred Tax Assets (Liabilities) Recognised In Financial Position Issuance price, percentage of discount to 15-day WVAP Issuance Price, Percentage Of Discount To 15-Day WVAP Issuance Price, Percentage Of Discount To 15-Day WVAP Categories of related parties [axis] Categories of related parties [axis] LIABILITIES AT AMORTIZED COST Financial liabilities at amortised cost, category [member] Impairment of goodwill, intangible assets, property and plant and equipment Description of accounting policy for impairment of non-financial assets [text block] Disclosure of detailed information about borrowings [line items] Disclosure of detailed information about borrowings [line items] Exercise price, other equity instruments granted (in euro per share) Exercise Price, Other Equity Instruments Granted Exercise Price, Other Equity Instruments Granted Losses on financial liabilities (Increase) / decrease in other liabilities / (assets) at fair value through profit and loss Losses On Financial Liabilities (Assets) At Fair Value Through Profit Or Loss Losses On Financial Liabilities (Assets) At Fair Value Through Profit Or Loss Net loss for the period Net loss for the period Net loss Profit (loss) Amount of reasonably possible increase in unobservable input, liabilities (in euro per share) Amount Of Reasonably Possible Increase In Unobservable Input, Liabilities Amount Of Reasonably Possible Increase In Unobservable Input, Liabilities Contractual severance indemnity Key Management Personnel Compensation, Contractual Severance Indemnity Key Management Personnel Compensation, Contractual Severance Indemnity €150.0 million financing, august 2023 €150.0 Million Financing, August 2023 [Member] €150.0 Million Financing, August 2023 Monte Carlo Model Monte Carlo Model1 [Member] Monte Carlo Model Number of share-based compensation plans issued Number Of Share-Based Compensation Plans Issued Number Of Share-Based Compensation Plans Issued Advances related to CRO contracts Non-Current Advances To CRO Contracts, Undiscounted Amount Non-Current Advances To CRO Contracts, Undiscounted Amount Total non-current liabilities Non-current liabilities Closing foreign exchange rate Closing foreign exchange rate Other investments Other Current Investments Other Current Investments AGA-2025-5 AGA-2025-5 [Member] AGA-2025-5 Document Registration Statement Document Registration Statement Number of shares issued at beginning of period (in shares) Number of shares issued at end of period (in shares) Number of shares issued (in shares) Number of shares issued Segment information Disclosure of entity's operating segments [text block] Lease facilities, Boston Lease Facilities, Boston [Member] Lease Facilities, Boston Borrowings, debt-to-market capitalization ratio Borrowings, Debt-To-Market Capitalization Ratio Borrowings, Debt-To-Market Capitalization Ratio Temporary difference, unused tax losses and unused tax credits [domain] Temporary difference, unused tax losses and unused tax credits [domain] Capital commitments Capital commitments AGA-2025-2 AGA-2025-2 [Member] AGA-2025-2 Trade and other current payables [abstract] DEPRECIATION Accumulated depreciation and amortisation [member] Financial gain (loss) Disclosure of finance income (cost) [text block] Increase (decrease) in financial liabilities at fair value due to reasonably possible decrease in unobservable input Increase (decrease) in fair value measurement due to reasonably possible decrease in unobservable input, liabilities Disclosure of composition of cash and cash equivalents Disclosure Of Composition Of Cash And Cash Equivalents [Table Text Block] Disclosure Of Composition Of Cash And Cash Equivalents Conversion of Kreos Claret OCABSA and Heights notes Increase (decrease) through conversion of convertible instruments, equity Increase (decrease) through conversion of convertible instruments, equity FROM 1 TO 2 YEARS Later than one year and not later than two years [member] RETIREMENT BENEFIT OBLIGATIONS Present value of defined benefit obligation [member] Leases Description of accounting policy for leases [text block] Business Contact Business Contact [Member] Tranche 6 Tranche Six [Member] Tranche Six Kreos/Claret financing B and C Kreos/Claret Financing B And C [Member] Kreos/Claret Financing B And C Benefits paid Decrease (increase) in net defined benefit liability (asset) resulting from payments from plan Tranches 1-4 Tranches One To Four [Member] Tranches One To Four Borrowings, interest rate basis Borrowings, Basis Interest Rate Borrowings, Basis Interest Rate AGA-2025-3 AGA-2025-3 [Member] AGA-2025-3 Categories of financial assets [domain] Categories of financial assets [domain] Tranche 1 Tranche One [Member] Tranche One Carrying amount [member] Carrying amount [member] Percentage of reasonably possible increase in unobservable input, assets Percentage of reasonably possible increase in unobservable input, assets Unobservable inputs [domain] Unobservable inputs [domain] Changes in equity [abstract] Changes in equity [abstract] Total compensation Key management personnel compensation, short-term employee benefits Security Exchange Name Security Exchange Name Net defined benefit liability (asset) at beginning of period Net defined benefit liability (asset) at end of period Net defined benefit liability (asset) Financial Risk Management [Abstract] Financial Risk Management [Abstract] Borrowings Other current borrowings and current portion of other non-current borrowings Disclosure of main data and assumptions used for the measurement of other equity instruments Disclosure of indirect measurement of fair value of goods or services received, other equity instruments granted during period [text block] Net proceeds from sale of treasury shares Proceeds from sale or issue of treasury shares Pre-tax revenue threshold Other Financial Liabilities, Percentage Of Annual Revenue From Sale Of Products Developed, Pre-Tax Revenue Threshold Other Financial Liabilities, Percentage Of Annual Revenue From Sale Of Products Developed, Pre-Tax Revenue Threshold Retirement benefit obligations Non-current provisions for employee benefits Right-of-use assets Right-of-use assets Financial agreement, amount Financial Agreement, Amount Financial Agreement, Amount Vesting percentage Vesting Requirements For Share-Based Payment Arrangement, Vesting Percentage Vesting Requirements For Share-Based Payment Arrangement, Vesting Percentage Contact Personnel Name Contact Personnel Name Kreos & Claret Financing, Tranche A,B and C Kreos & Claret Financing, Tranche A,B and C [Member] Kreos & Claret Financing, Tranche A,B and C Number of other share warrants repurchased (in shares) Number Of Other Share Warrants Repurchased Number Of Other Share Warrants Repurchased New, revised or amended Standards and Interpretations Disclosure Of Accounting Policy For New, Revised Or Amended Standards And Interpretations [Policy Text Block] Disclosure Of Accounting Policy For New, Revised Or Amended Standards And Interpretations Royalty certificate, expiration period Royalty Certificate, Expiration Period Royalty Certificate, Expiration Period Leases Leases Related Temporary Differences [Member] Leases Related Temporary Differences Employee contribution rate Actuarial Assumption Of Employee Contribution Rate Actuarial Assumption Of Employee Contribution Rate Conversion price, adjustment, period Conversion Price, Adjustment, Period Conversion Price, Adjustment, Period Number of warrants granted (in shares) Number Of Warrants Granted Number Of Warrants Granted AGA-2025-4 AGA-2025-4 [Member] AGA-2025-4 Increase (decrease) in Ulcerative Colitis expenses Increase (Decrease) In Ulcerative Colitis Expenses Increase (Decrease) In Ulcerative Colitis Expenses Derivative instruments Derivatives [member] Financial assets, at fair value Financial assets, at fair value Statistical Measurement [Domain] Statistical Measurement [Domain] WACC Weighted average cost of capital, measurement input [member] Borrowings Non-current portion of other non-current borrowings Principal Agreements [Domain] Principal Agreements [Domain] Principal Agreements [Domain] BSA-2015-12 BSA-2015-12 [Member] BSA-2015-12 Other employees Other Employees [Member] Other Employees Tax losses carryforward Unused tax losses [member] Assets Acquisitions [Axis] Assets Acquisitions [Axis] Assets Acquisitions Service cost Increase in net defined benefit liability (asset) resulting from current service cost Day-one gain on recognition of financial liabilities Gains Arising From Recognition Of Financial Liabilities Gains Arising From Recognition Of Financial Liabilities TRANSLATION RESERVE Reserve of exchange differences on translation [member] Liabilities arising from financing activities [axis] Liabilities arising from financing activities [axis] Provisions for AGA taxes Provisions For AGA Taxes Related Temporary Differences [Member] Provisions For AGA Taxes Related Temporary Differences Consulting fees Key Management Personnel Compensation, Consulting Fees Key Management Personnel Compensation, Consulting Fees Other financial assets Total other non-current financial assets Other non-current financial assets Financial agreement, number of transactions Financial Agreement, Number Of Transactions Financial Agreement, Number Of Transactions Repayments of non-convertible bond loans Repayments Of Non-Convertible Loans Notes Repayments Of Non-Convertible Loans Notes Total operating expenses Operating expenses Operating expense Trade payables and other current liabilities Trade Payables And Other Current Liabilities [Member] Trade Payables And Other Current Liabilities Useful life measured as period of time, intangible assets other than goodwill Useful life measured as period of time, intangible assets other than goodwill Classes of share capital [axis] Classes of share capital [axis] Assets Acquisitions [Domain] Assets Acquisitions [Domain] Assets Acquisitions [Domain] Social taxes related to AGAs Expense From Equity-Settled Share-Based Payment Transactions, Social Taxes Expense From Equity-Settled Share-Based Payment Transactions, Social Taxes Number of instruments that are antidilutive in period presented (in shares) Number of instruments that are antidilutive in period presented Major share-based transactions Major Share-Based Transactions [Member] Major Share-Based Transactions Total shareholders’ equity Equity at beginning of period Equity at end of period Equity Equity Entity Addresses, Address Type [Axis] Entity Addresses, Address Type [Axis] Potential development milestone payment, IND filing Collaboration Agreements, Potential Development Milestone Payment, IND Filing Collaboration Agreements, Potential Development Milestone Payment, IND Filing Off-balance sheet commitments given Disclosure of commitments [text block] Lease, extension period Lease, Extension Period Lease, Extension Period AGA-2025-6 AGA-2025-6 [Member] AGA-2025-6 Number of financial institutions to maintain cash Number Of Financial Institutions To Maintain Cash Number Of Financial Institutions To Maintain Cash Lease, tacit renewal period Lease, Tacit Renewal Period Lease, Tacit Renewal Period Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] Disclosure Of Fair Value Measurement Of Assets And Liabilities Derivative financial liabilities, undiscounted cash flows Derivative financial liabilities, undiscounted cash flows Other receivables and assets Other assets Types of contracts [domain] Types of contracts [domain] Corporate information and statement of IFRS compliance [abstract] Disclosure of detailed information about property, plant and equipment [line items] Disclosure of detailed information about property, plant and equipment [line items] Sales and marketing expenses Sales And Marketing Expense [Member] Sales And Marketing Expense Undrawn borrowing facilities Undrawn borrowing facilities STRIKE PRICE PER SHARE ( in euro per share) Equity Instrument Strike Price, Other Equity Instruments Granted Equity Instrument Strike Price, Other Equity Instruments Granted Discount rate Discount rate, measurement input [member] Number of ADS per ordinary shares (in shares) Number of ADS per Ordinary Shares Number of ADS per Ordinary Shares Subsidies Subsidies Related Temporary Differences [Member] Subsidies Related Temporary Differences Conversion price per share (in euro per share) Conversion Price Per Share, Measurement Input [Member] Conversion Price Per Share, Measurement Input Office fixtures and fittings Fixtures and fittings [member] Peak penetration Peak Penetration, Measurement Input [Member] Peak Penetration, Measurement Input Disclosure of reconciliation of effective income tax (loss) Disclosure Of Reconciliation Of Accounting Profit Multiplied By Applicable Tax Rates And Average Effective Tax Rate [Table Text Block] Disclosure Of Reconciliation Of Accounting Profit Multiplied By Applicable Tax Rates And Average Effective Tax Rate Depreciation expense, lease Depreciation Expense, Lease Depreciation Expense, Lease The Scripps Research Institute, University of Chicago and Brigham Young University The Scripps Research Institute, University Of Chicago And Brigham Young University [Member] The Scripps Research Institute, University Of Chicago And Brigham Young University Sales and marketing Sales and marketing expense Changes in provisions Adjustments for provisions Accounting of Prosynergia acquisition Disclosure Of Accounting Policy For Assets Acquisitions [Policy Text Block] Disclosure Of Accounting Policy For Assets Acquisitions Annual revenue from sale of products developed Other Financial Liabilities, Payable, Annual Revenue From Sale Of Products Developed Other Financial Liabilities, Payable, Annual Revenue From Sale Of Products Developed Exercise price per share (in euro per share) Exercise Price Per Share, Measurement Input [Member] Exercise Price Per Share, Measurement Input Deferred tax assets, net Deferred tax liability (asset) Other Other adjustments for non-cash items Lease facilities Lease Facilities [Member] Lease Facilities Total current liabilities Current liabilities AGA-2025-1 AGA-2025-1 [Member] AGA-2025-1 Trade and other receivables [abstract] Expenses by nature [abstract] Deferred tax assets Deferred tax assets Deferred tax assets Decrease through reassessment of lease term Decrease Through Reassessment Of Lease Term, Right-Of-Use Assets Decrease Through Reassessment Of Lease Term, Right-Of-Use Assets Decrease in deposits Proceeds From Reimbursements Of Deposits Proceeds From Reimbursements Of Deposits Document Accounting Standard Document Accounting Standard Social security and other Current payables on social security and taxes other than income tax Disclosure of temporary difference, unused tax losses and unused tax credits [line items] Disclosure of temporary difference, unused tax losses and unused tax credits [line items] Expense on lease liabilities Expense On Lease Liabilities Expense On Lease Liabilities Loss of extinguishment Gain (loss) arising from difference between carrying amount of financial liability extinguished and consideration paid Disclosure of quantitative information about right-of-use assets [line items] Disclosure of quantitative information about right-of-use assets [line items] Operating expenses Disclosure of other operating expense [text block] Disclosure Of Financial Gain (Loss) [Line Items] Disclosure Of Financial Gain (Loss) [Line Items] Disclosure Of Financial Gain (Loss) [Line Items] General and administrative expense General And Administrative Expenses [Member] General And Administrative Expenses Share-based payments Description of accounting policy for share-based payment transactions [text block] PGE Prêt Garanti Par l'Etat (PGE) [Member] Prêt Garanti Par l'Etat (PGE) Statement of changes in equity [abstract] Advisor to the Chief Executive Officer Advisor To The Chief Executive Officer [Member] Advisor To The Chief Executive Officer Measurement [domain] Measurement [domain] Kreos A BSA Kreos A BSA [Member] Kreos A BSA Convertible loans notes Convertible Loans Notes Convertible Loans Notes AGA-2023-5 AGA-2023-5 [Member] AGA-2023-5 Disclosure Of Employee Workforce [Line Items] Disclosure Of Employee Workforce [Line Items] Disclosure Of Employee Workforce [Line Items] Other liabilities, number of transactions Other Liabilities, Number Of Transactions Other Liabilities, Number Of Transactions Total BCEs BCEs Founders’ Share Subscription Warrants (BCE) [Member] Founders’ Share Subscription Warrants (BCE) Disclosure of detailed information about financial instruments [line items] Disclosure of detailed information about financial instruments [line items] Significant unobservable input, assets Significant unobservable input, assets BUILDINGS Buildings Buildings [member] Number of instruments issued (in shares) NUMBE OF BSAs ( in shares) Number of other equity instruments granted in share-based payment arrangement Types of risks [domain] Types of risks [domain] Decrease / (increase) in other receivables and related accounts Adjustments for decrease (increase) in trade and other receivables Legal Entity [Axis] Legal Entity [Axis] BSA-2025-1 BSA-2025-1 [Member] BSA-2025-1 Subsidiaries [axis] Subsidiaries [axis] €49.2 million cross-over financing, september 2022 €49.2 Million Cross-Over Financing, September 2022 [Member] €49.2 Million Cross-Over Financing, September 2022 Kreos & Claret financing, tranche C Kreos & Claret Financing, Tranche C [Member] Kreos & Claret Financing, Tranche C Key magement Management [Member] FAIR VALUE OF THE UNDERLYING SHARE (in euro per share) Underlying Share Fair Value, Other Equity Instruments Granted Underlying Share Fair Value, Other Equity Instruments Granted Geographical [Domain] Geographical [Domain] Disclosure of financial liabilities [table] Disclosure of financial liabilities [table] Disclosure of main data and assumptions used for the measurement of convertible loan notes Disclosure Of Indirect Measurement Of Convertible Loans Instruments [Table Text Block] Disclosure of breakdown of operating income Disclosure Of Detailed Information Of Operating Income Explanatory [Table Text Block] Disclosure Of Detailed Information Of Operating Income Explanatory Final redemption, probability-weighted fair value with MRI Final Redemption, Probability-Weighted Fair Value With MRI , Measurement Input [Member] Final Redemption, Probability-Weighted Fair Value With MRI , Measurement Input Geographical areas [axis] Geographical areas [axis] Net defined benefit liability (asset) [domain] Net defined benefit liability (asset) [domain] AGA-2024-3 AGA-2024-3 [Member] AGA-2024-3 Liabilities arising from financing activities at beginning of period Liabilities arising from financing activities at end of period Liabilities arising from financing activities Kreos 2, tranche A Kreos 2, Tranche A [Member] Kreos 2, Tranche A Number of shares received per ADS (in shares) Number Of Shares Received Per ADS Number Of Shares Received Per ADS CIR Tax Year [Axis] CIR Tax Year [Axis] CIR Tax Year Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Notice accounts Other cash and cash equivalents FURNITURE AND COMPUTER EQUIPMENT Furniture And Computer Equipment [Member] Furniture And Computer Equipment Intangible assets Intangible assets other than goodwill at beginning of period Intangible assets other than goodwill at end of period Intangible assets other than goodwill Document Financial Statement Error Correction [Flag] Document Financial Statement Error Correction [Flag] Increase (decrease) in employer tax and social contributions Increase (Decrease) In Employer Tax And Social Contributions Increase (Decrease) In Employer Tax And Social Contributions Derivative instruments Non-current derivative financial liabilities Auditor Information [Abstract] Auditor Information Cash and cash equivalents Cash and cash equivalents at the beginning of the year Cash and cash equivalents at the end of the year Cash and cash equivalents Cash and cash equivalents Royalty certificates Royalty Certificates Related Temporary Differences [Member] Royalty Certificates Related Temporary Differences Disclosure of maturity analysis for derivative financial liabilities [table] Disclosure of maturity analysis for derivative financial liabilities [table] Translation reserve Reserve of exchange differences on translation Disclosure of non-adjusting events after reporting period [line items] Disclosure of non-adjusting events after reporting period [line items] Disclosure of aggregate compensation of the members of the Group’s Board of Directors and CEO Disclosure of transactions between related parties [text block] TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY Equity and liabilities United States UNITED STATES Monte Carlo model Monte Carlo Model IFRS [Member] Monte Carlo Model IFRS Property, plant and equipment [abstract] AGA-2024-4, AGA-2024-5 and AGA-2024-6 AGA-2024-4, AGA-2024-5 and AGA-2024-6 [Member] AGA-2024-4, AGA-2024-5 and AGA-2024-6 Board member Board Member [Member] Board Member Decrease / (increase) in derivatives and other liabilities measured at FVTPL Tax Effect Of Changes In Derivative Fair Value And Other Liabilities Measured At FVTPL Tax Effect Of Changes In Derivative Fair Value And Other Liabilities Measured At FVTPL Financial liabilities-current portion Current Financial Liabilities [Member] Current Financial Liabilities Interest rate Interest rate, measurement input [member] Tax and employee-related payables TAX AND EMPLOYEE-RELATED PAYABLES Current Tax And Employee Benefit Liabilities Current Tax And Employee Benefit Liabilities Other share warrants, exercise period Other Share Warrants, Exercise Period Other Share Warrants, Exercise Period Disclosure of allocation of acquisition cost Disclosure Of Detailed Information About Assets Acquisitions Explanatory [Table Text Block] Disclosure Of Detailed Information About Assets Acquisitions Explanatory Disclosure of attribution of expenses by nature to their function [table] Disclosure of attribution of expenses by nature to their function [table] Decrease in fair value (Increase) / decrease in derivatives fair value Gains on change in fair value of derivatives Gains on change in fair value of derivatives BSA-2017-1 BSA-2017-1 [Member] BSA-2017-1 Disclosure of remaining contractual maturities of non-derivative financial liabilities Disclosure of maturity analysis for non-derivative financial liabilities [text block] BSA-2024-2 BSA-2024-2 [Member] BSA-2024-2 Furniture Furniture [Member] Furniture Heights convertible notes Heights Convertible Notes [Member] Heights Convertible Notes Cash advances and loans made to CRO Payments For Advances Made to Contract Research Organizations, Undiscounted Amount Payments For Advances Made to Contract Research Organizations, Undiscounted Amount Borrowings maturity, deferral period Borrowings Maturity, Deferral Period Borrowings Maturity, Deferral Period Employee-related payables Short-term employee benefits accruals Non cash changes : Effect of the change in foreign currency exchange rates Increase (decrease) through effect of changes in foreign exchange rates, liabilities arising from financing activities Credit notes Current Receivables From Credit Notes Current Receivables From Credit Notes Disclosure Of Commitments Received [Table] Disclosure Of Commitments Received [Table] Disclosure Of Commitments Received [Table] City Area Code City Area Code United States of America, Dollars United States of America, Dollars Financial assets and liabilities Disclosure of fair value of financial instruments [text block] Number of probability-weighted scenarios Number Of Probability-Weighted Scenarios Number Of Probability-Weighted Scenarios Useful life measured as period of time, property, plant and equipment Useful life measured as period of time, property, plant and equipment Cash and cash equivalents Cash And Cash Equivalent [Member] Cash And Cash Equivalent Categories of financial liabilities [domain] Categories of financial liabilities [domain] LONGER THAN 5 YEARS Later than five years [member] Splicos SAS Splicos SAS - ABX464 [Member] Splicos SAS - ABX464 Oceane conversion option OCEANE conversion option Oceane Conversion Option [Member] Oceane Conversion Option Related parties Disclosure of related party [text block] Impairment loss recognised in profit or loss, intangible assets and goodwill Impairment loss recognised in profit or loss, intangible assets and goodwill Intangible assets Disclosure of intangible assets [text block] Borrowings, discount rate Borrowings, Discount Rate Borrowings, Discount Rate Statement of compliance Statement of IFRS compliance [text block] VAT receivables Current value added tax receivables Disposal Disposals, property, plant and equipment including right-of-use assets Interest expense on lease liabilities Interest on lease liabilities Interest expense on lease liabilities Number of free shares plans issued Number Of Free Shares Plans Issued Number Of Free Shares Plans Issued Disclosure of classes of share capital [table] Disclosure of classes of share capital [table] Unobservable inputs [axis] Unobservable inputs [axis] Auditor Name Auditor Name Former Chief Executive Officer Former Chief Executive Officer [Member] Former Chief Executive Officer Financial Agreement [Domain] Financial Agreement [Domain] Financial Agreement [Domain] Investments in mutual funds and structured notes Investments In Mutual Funds And Structured Notes Investments In Mutual Funds And Structured Notes Minimal return Minimal Return, Measurement Input [Member] Minimal Return, Measurement Input Contribution to Group's net profits (losses), percentage Contribution To Group's Net Profits (Losses), Percentage Contribution To Group's Net Profits (Losses), Percentage AGA-2025-1, AGA-2025-3, AGA-2025-4, AGA-2025-6, AGA-2025-7 and AGA-2025-8 AGA-2025-1, AGA-2025-3, AGA-2025-4, AGA-2025-6, AGA-2025-7 and AGA-2025-8 [Member] AGA-2025-1, AGA-2025-3, AGA-2025-4, AGA-2025-6, AGA-2025-7 and AGA-2025-8 Other receivables and other assets Disclosure of trade and other receivables [text block] Other financial assets Total other current financial assets Other current financial assets Industrial materials and equipment Industrial Materials And Equipment [Member] Industrial Materials And Equipment Wittycel SAS Wittycel SAS - ABX196 [Member] Wittycel SAS - ABX196 Amount of reasonably possible decrease in unobservable input, liabilities (in euro per share) Amount Of Reasonably Possible Decrease In Unobservable Input, Liabilities Amount Of Reasonably Possible Decrease In Unobservable Input, Liabilities AGA-2023-4 AGA-2023-4 [Member] AGA-2023-4 Cash flows provided by (used in) operating activities Cash flows from (used in) operating activities Disclosure of terms and conditions of share-based payment arrangement [line items] Disclosure of terms and conditions of share-based payment arrangement [line items] Non-current liabilities Non-current liabilities [abstract] Entity [Domain] Entity [Domain] Non-cash changes: classification of embedded derivatives as separate derivative financial instruments Increase (Decrease) Through Classification of Embedded Derivatives as Separate Financial Instruments, Liabilities Arising From Financing Activities Increase (Decrease) Through Classification of Embedded Derivatives as Separate Financial Instruments, Liabilities Arising From Financing Activities Kreos & Claret BSA Kreos & Claret Financing, BSA [Member] Kreos & Claret Financing, BSA Share-based payments Disclosure of share-based payment arrangements [text block] Other Miscellaneous other operating income Other financial liabilities Other non-current financial liabilities Intellectual property fees Intellectual Property Fees Intellectual Property Fees Royalty certificates Royalty Certificates [Member] Royalty Certificates Net proceeds from convertible loan notes Net Proceeds From Convertible Loan Notes Net Proceeds From Convertible Loan Notes Document Fiscal Year Focus Document Fiscal Year Focus Adjustments for: Adjustments to reconcile profit (loss) [abstract] Borrowings, number of tranches Borrowings, Number Of Tranches Borrowings, Number Of Tranches Unobservable input, liabilities, discount rate Unobservable Input, Liabilities, Discount Rate Unobservable Input, Liabilities, Discount Rate Transaction costs related to capital increase Share Issue Related Cost (Credit) Share Issue Related Cost (Credit) Retirement age Actuarial assumption of retirement age Current financial liabilities Current financial liabilities VOLATILITY Expected Volatility, Other Equity Instruments Granted Expected Volatility, Other Equity Instruments Granted Types of interest rates [domain] Types of interest rates [domain] Other receivables and assets Other Receivables And Assets [Member] Other Receivables And Assets Other operating income Total operating income Other income Number of academic institutions Number Of Academic Institutions Number Of Academic Institutions Issue of convertible notes Issue of convertible instruments Foreign exchange gains Foreign exchange gain Number of projects terminated Number Of Projects Terminated Number Of Projects Terminated Exchange [Domain] Exchange [Domain] Trade payables Current trade payables Total Key management personnel compensation Kreos 1, convertible bond loans, tranche A Kreos 1, Convertible Bond Loans, Tranche A [Member] Kreos 1, Convertible Bond Loans, Tranche A Warrants [Domain] Warrants [Domain] Warrants Other financial expense Other finance cost Derivative financial liabilities at beginning of period Derivative financial liabilities at end of period Derivative financial liabilities Derivative financial liabilities Disclosure of credit risk exposure [line items] Disclosure of credit risk exposure [line items] Disclosure of main actuarial assumptions used to measure the retirement benefit obligations Disclosure of defined benefit plans [text block] Contribution to Group's assets, percentage Contribution To Group's Assets, Percentage Contribution To Group's Assets, Percentage Ordinary shares Ordinary shares [member] POS Probability Of Success, Measurement Input [Member] Probability Of Success, Measurement Input Income (loss) per share Disclosure of earnings per share [text block] GROSS VALUES Gross carrying amount [member] Trade payables and other current liabilities Trade payables and other current liabilities Trade and other current payables Repayments of bond loans Repayments Of Bond Loans Repayments Of Bond Loans Statutory French tax rate Applicable tax rate Warrants [Axis] Warrants [Axis] Warrants Ebola conditional advance EBOLA – Bpifrance Ebola Conditional Advance, BPI [Member] Ebola Conditional Advance, BPI Accrued invoices Accruals classified as current Local Phone Number Local Phone Number Capital increases Proceeds from issuing shares LESS THAN 1 YEAR Not later than one year [member] Prosynergia Prosynergia [Member] Prosynergia Retirement benefit obligation Retirement Benefit Obligations Related Temporary Differences [Member] Retirement Benefit Obligations Related Temporary Differences Carrying amount of the equity component Convertible Loans Notes, Carrying Amount Of The Equity Component Convertible Loans Notes, Carrying Amount Of The Equity Component Audit-related fees Auditor's Remuneration For Audit-Related Fees Auditor's Remuneration For Audit-Related Fees BCE-2017-4 BCE-2017-4 [Member] BCE-2017-4 Maximum number of shares to be issued (in shares) Maximum Number Of Shares To Be Issued Maximum Number Of Shares To Be Issued LIABILITIES AT FAIR VALUE THROUGH PROFIT AND LOSS Financial liabilities at fair value through profit or loss, category [member] Aggregate exercise price Aggregate Exercise Price, Other Equity Instruments Granted Aggregate Exercise Price, Other Equity Instruments Granted Total auditor's remuneration Auditor's remuneration European Central Bank base rate European Central Bank Base Rate [Member] European Central Bank Base Rate Financial liabilities-non current portion Non-Current Financial Liabilities [Member] Non-Current Financial Liabilities Disclosure of financial assets [line items] Disclosure of financial assets [line items] Property, plant and equipment Property, plant and equipment [member] Property, plant and equipment Description of accounting policy for property, plant and equipment [text block] Borrowings, percentage of market price Borrowings, Percentage Of Market Price Borrowings, Percentage Of Market Price Proceeds from borrowings Proceeds from borrowings, classified as financing activities Payments of the lease liabilities Payments of lease liabilities, classified as financing activities Entity Voluntary Filers Entity Voluntary Filers Tax fees Auditor's remuneration for tax services Number of other share warrants converted (in shares) Number Of Other Share Warrants Converted Number Of Other Share Warrants Converted Number of instruments granted, percentage exercisable immediately Number Of Instruments Granted, Other Equity Instruments, Percentage Exercisable Immediately Number Of Instruments Granted, Other Equity Instruments, Percentage Exercisable Immediately Non-cash changes: other fair value remeasurement Increase (decrease) through changes in fair values, liabilities arising from financing activities Effect of unwinding the discount related to advances Adjustments For Unwinding Of Discount Related To Conditional Advances Adjustments For Unwinding Of Discount Related To Conditional Advances Increase in fair value (Increase) / decrease in derivatives fair value Losses on change in fair value of derivatives Losses on change in fair value of derivatives Borrowings, exit fee percentage Borrowings, Exit Fee Percentage Borrowings, Exit Fee Percentage Decrease in lease liabilities through modification of term Decrease In Lease Liabilities Through Modification Of Term Decrease In Lease Liabilities Through Modification Of Term Share-Based Payment Arrangements [Abstract] Share-Based Payment Arrangements [Abstract] Share-Based Payment Arrangements [Abstract] Ordinary share price (in euro per share) Share Price, Measurement Input [Member] Share Price, Measurement Input BCE-2017-5 BCE-2017-5 [Member] BCE-2017-5 Entity Registrant Name Entity Registrant Name Basic loss per share (in euro per share) Basic earnings (loss) per share AGA-2023-1 AGA-2023-1 [Member] AGA-2023-1 Measurement [axis] Measurement [axis] Disclosure Of Operating Income [Table] Disclosure Of Operating Income [Table] Disclosure Of Operating Income [Table] Weighted average number of outstanding shares used for computing diluted loss per share (in shares) Weighted average number of outstanding shares, diluted loss per share (in shares) Weighted average number of ordinary shares used in calculating diluted earnings per share After 36 months After 36 Months [Member] After 36 Months Turnover rate Actuarial Assumption Of Expected Rates Of Turnover Actuarial Assumption Of Expected Rates Of Turnover Contributions in-kind Key Management Personnel Compensation, In-Kind Contributions Key Management Personnel Compensation, In-Kind Contributions Unrecognition day-one gain of financial liabilities Unrecognition Day-One Gain Of Financial Liabilities Unrecognition Day-One Gain Of Financial Liabilities Decrease in financial assets at fair value Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets Classes of intangible assets other than goodwill [domain] Classes of intangible assets other than goodwill [domain] Share-based compensation expenses Adjustments for share-based payments Borrowings, number of quarterly installments Borrowings, Number Of Quarterly Installments Borrowings, Number Of Quarterly Installments Kreos & Claret financing and Heights convertible notes Kreos & Claret Financing And Heights Convertible Notes [Member] Kreos & Claret Financing And Heights Convertible Notes Conditional advances and PGE loan Conditional Advances And PGE Loan [Member] Conditional Advances And PGE Loan Technical facilities Technical Facilities [Member] Technical Facilities Black Scholes Model Black Scholes Model [Member] Black Scholes Model Retirement benefit obligations Disclosure of employee benefits [text block] Performance conditions, minimum financing Vesting Requirements For Share-Based Payment Arrangement, Performance Conditions, Minimum Financing Vesting Requirements For Share-Based Payment Arrangement, Performance Conditions, Minimum Financing (Increase) / decrease in other liabilities / (assets) at fair value through profit and loss Gains On Financial Liabilities At Fair Value Through Profit Or Loss Gains On Financial Liabilities At Fair Value Through Profit Or Loss All Currencies [Domain] All Currencies [Domain] Shareholders’ equity Equity [abstract] Disclosure of operating segments [abstract] Issuance of other share warrants Issuance Of Other Share Warrants Issuance Of Other Share Warrants Disclosure of carrying amounts and fair value of financial assets Disclosure of fair value measurement of assets [text block] Percentage of annual revenue from sale of products developed Other Financial Liabilities, Percentage Of Annual Revenue From Sale Of Products Developed Other Financial Liabilities, Percentage Of Annual Revenue From Sale Of Products Developed Ebola conditional advance, BPI Languedoc-Roussillon Ebola Conditional Advance, BPI Languedoc-Roussillon [Member] Ebola Conditional Advance, BPI Languedoc-Roussillon Fixed compensation owed Key Management Personnel Compensation, Fixed Compensation Key Management Personnel Compensation, Fixed Compensation Kreos 1 bond loans Kreos 1 Bond Loans [Member] Kreos 1 Bond Loans Amortized cost (EIR method) Amortized Cost (EIR Method) [Member] Amortized Cost (EIR Method) Collaboration agreements, development milestone payment, IND approval Collaboration Agreements, Development Milestone Payment, IND Approval Collaboration Agreements, Development Milestone Payment, IND Approval AGA-2024-4 AGA-2024-4 [Member] AGA-2024-4 Probability-weighted present value of shortfall payment, tender offer Tender Offer, Probability-Weighted Present Value Of Shortfall Payment, Measurement Input [Member] Tender Offer, Probability-Weighted Present Value Of Shortfall Payment, Measurement Input Acquisition Additions other than through business combinations, intangible assets other than goodwill ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Kreos & Claret financing, tranche B Kreos & Claret Financing, Tranche B [Member] Kreos & Claret Financing, Tranche B Disclosure of temporary difference, unused tax losses and unused tax credits [table] Disclosure of temporary difference, unused tax losses and unused tax credits [table] Unwinding of discount on royalties Unwinding Of Discount On Royalties Unwinding Of Discount On Royalties Auditor Firm ID Auditor Firm ID Employer contributions Key management personnel compensation, post-employment benefits Types of contracts [axis] Types of contracts [axis] PREMIUMS RELATED TO SHARE CAPITAL Share premium Share premium [member] Borrowings, additional tranche mount Borrowings, Additional Tranche Amount Borrowings, Additional Tranche Amount Disount rate applied to long-term advances Discount Rate Applied To Long-Term Advances Discount Rate Applied To Long-Term Advances Royalty certificates Non-Current Royalty Certificates Non-Current Royalty Certificates Change of control, minimum percentage Vesting Requirements For Share-Based Payment Arrangement, Change Of Control, Minimum Threshold Vesting Requirements For Share-Based Payment Arrangement, Change Of Control, Minimum Threshold Volatility, expiry Volatility For Shares Measurement Input, Expiry [Member] Volatility For Shares Measurement Input, Expiry Financial liabilities Liabilities Liabilities Research tax credit and subsidies Description of accounting policy for government grants [text block] Office equipment EQUIPMENT Office equipment [member] Percentage of conditional advances waived Percentage Of Conditional Advances Waived Percentage Of Conditional Advances Waived Exclusive licensing agreement with CNRS, University of Montpellier and Institut Curie Exclusive Licensing Agreement With CNRS, University Of Montpellier And Institut Curie [Member] Exclusive Licensing Agreement With CNRS, University Of Montpellier And Institut Curie Disclosure of remaining contractual maturities of derivative financial liabilities Disclosure of maturity analysis for derivative financial liabilities [text block] Title and Position [Axis] Title and Position [Axis] Borrowings, maximum borrowing capacity per tranche Borrowings, Maximum Borrowing Capacity Per Tranche Borrowings, Maximum Borrowing Capacity Per Tranche Total BSAs BSAs Share Subscription Warrants (BSA) [Member] Share Subscription Warrants (BSA) Intangible assets Description of accounting policy for intangible assets other than goodwill [text block] No Trading Symbol Flag No Trading Symbol Flag Discount rate (WACC) Discount rate applied to cash flow projections Other financial assets Disclosure of other assets [text block] Disclosure of information for cash-generating units [table] Disclosure of information for cash-generating units [table] Interest on bond loans Interest expense on bonds Turnover rate, average exit rate Actuarial Assumption Of Expected Rates Of Turnover, Average Exit Rate Actuarial Assumption Of Expected Rates Of Turnover, Average Exit Rate Repayments of convertible loan notes Repayments of convertible loan notes Repayments Of Convertible Loans Notes Repayments Of Convertible Loans Notes Lease liabilities Lease liabilities [member] BSA SUBSCRIPTION PRICE (in euro per share) AGA PRICE (in euro per share) Equity Instrument Price, Other Equity Instruments Granted Equity Instrument Price, Other Equity Instruments Granted Significant events for the years ended December 31, 2023, 2024 and 2025 and subsequent event Disclosure Of Significant Events For The Period Reported And Events After Reporting Period [Text Block] Disclosure Of Significant Events For The Period Reported And Events After Reporting Period Disclosure of variation in lease liabilities Disclosure Of Leases For Lessee [Table Text Block] Disclosure Of Leases For Lessee BSA-2015-11 BSA-2015-11 [Member] BSA-2015-11 Non-cash changes: (gain)/loss on recognition or derecognition Increase (Decrease) Through Gain (Loss) On Recognition/Derecognition, Liabilities Arising From Financing Activities Increase (Decrease) Through Gain (Loss) On Recognition/Derecognition, Liabilities Arising From Financing Activities Property, plant and equipment Property, plant and equipment including right-of-use assets at beginning of period Property, plant and equipment including right-of-use assets at end of period Property, plant and equipment including right-of-use assets Financial liabilities, at fair value Financial liabilities, at fair value Deposit paid, borrowing Borrowings, Deposit Borrowings, Deposit Share-based compensation expense Expense from equity-settled share-based payment transactions Non-adjusting events after reporting period [axis] Non-adjusting events after reporting period [axis] Kreos 2, tranche B Kreos 2, Tranche B [Member] Kreos 2, Tranche B Valuation techniques used in fair value measurement [domain] Valuation techniques used in fair value measurement [domain] Top of range Top of range [member] Intangible assets and goodwill [abstract] Research and development Research and development expense Impact of the Ukraine/Russia Hostilities on the Group Disclosure Of Impact Of The Ukraine/Russia Hostilities On The Group [Policy Text Block] Disclosure Of Impact Of The Ukraine/Russia Hostilities On The Group Increase / (decrease) in tax and social security liabilities Adjustments For Increase (Decrease) In Tax And Social Security Liabilities Adjustments For Increase (Decrease) In Tax And Social Security Liabilities Actuarial gains and losses on retirement benefit obligations Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans Royalty certificate, percentage of future sales Royalty Certificate, Percentage Of Future Sales Royalty Certificate, Percentage Of Future Sales Attendance fees—board of directors Key Management Personnel Compensation, Attendance Fees Key Management Personnel Compensation, Attendance Fees Other sales and marketing expenses Other research and development expenses Other general and administrative expenses Miscellaneous other operating expense Net proceeds from non-convertible bond loans Net Proceeds From Non-Convertible Loans Notes Net Proceeds From Non-Convertible Loans Notes Financial Agreement [Axis] Financial Agreement [Axis] Financial Agreement Items that will not be reclassified to profit or loss Other comprehensive income that will not be reclassified to profit or loss, net of tax Disclosure Of Cash And Cash Equivalents [Line Items] Disclosure Of Cash And Cash Equivalents [Line Items] Disclosure Of Cash And Cash Equivalents [Line Items] Conversion option, maximum period prior to maturity date Convertible Loans Notes, Conversion Option, Maximum Period Prior To Maturity Date Convertible Loans Notes, Conversion Option, Maximum Period Prior To Maturity Date Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Borrowings by name [domain] Borrowings by name [domain] Currency risk Currency risk [member] Conditional advances Bpifrance Conditional Advances [Member] Conditional Advances CARENA conditional advance CARENA – Bpifrance CARENA Conditional Advance, BPI [Member] CARENA Conditional Advance, BPI AGA-2023-3 , AGA-2023-4 and AGA-2023-5 AGA-2023-3 , AGA-2023-4 And AGA-2023-5 [Member] AGA-2023-3 , AGA-2023-4 And AGA-2023-5 Deferred tax liabilities Deferred tax liabilities Geographical [Axis] Geographical [Axis] Property, plant and equipment including right-of-use assets [axis] Property, plant and equipment including right-of-use assets [axis] Income taxes paid Income taxes paid (refund), classified as operating activities Other comprehensive income (loss) Other comprehensive income (loss) Other comprehensive income Classes of liabilities [axis] Classes of liabilities [axis] AGA-2024-2 AGA-2024-2 [Member] AGA-2024-2 Fair value of other equity instruments Aggregate Fair Value, Other Equity Instruments Outstanding Aggregate Fair Value, Other Equity Instruments Outstanding Disclosure Of Cash And Cash Equivalents [Table] Disclosure Of Cash And Cash Equivalents [Table] Disclosure Of Cash And Cash Equivalents [Table] Provisions Other current provisions Kreos OCABSA Kreos OCABSA [Member] Kreos OCABSA Other Other Non-Current Miscellaneous Financial Assets Other Non-Current Miscellaneous Financial Assets Types of share-based payment arrangements [axis] Types of share-based payment arrangements [axis] Amortization of intangibles and depreciation of property, plant and equipment Adjustments for depreciation and amortisation expense Interest expense on borrowings Interest on conditional advances and PGE Interest expense on borrowings Title of 12(b) Security Title of 12(b) Security Disclosure Of Other Receivables And Other Assets [Line Items] Disclosure Of Other Receivables And Other Assets [Line Items] Disclosure Of Other Receivables And Other Assets [Line Items] Abivax LLC Abivax LLC [Member] Abivax LLC Disclosure Of Lease Liabilities [Line Items] Disclosure Of Lease Liabilities [Line Items] Disclosure Of Lease Liabilities [Line Items] Disclosure of carrying amounts and fair value of financial liabilities Disclosure of fair value measurement of liabilities [text block] Capital increase from issuance of ordinary shares Issue of equity Proceeds Increase Through Proceeds, Liabilities Arising From Financing Activities Increase Through Proceeds, Liabilities Arising From Financing Activities Borrowings, undiscounted cash flows Bank borrowings, undiscounted cash flows Kreos & Claret financing, tranche B and C Kreos & Claret Financing, Senior Secured Non-Convertible Loans [Member] Kreos & Claret Financing, Senior Secured Non-Convertible Loans Tranche 4 Tranche Four [Member] Tranche Four Excess conditional advances claimed Repayment Of Excess Conditional Advances Claimed Repayment Of Excess Conditional Advances Claimed Net gain on sale of treasury shares Adjustments For Net Gain On Sale Of Treasury Shares Adjustments For Net Gain On Sale Of Treasury Shares Risk-free rate, expiry Risk-Free Interest Rate, Measurement Input, Expiry [Member] Risk-Free Interest Rate, Measurement Input, Expiry €130.0 million cross-over financing, february 2023 €130.0 Million Cross-Over Financing, February 2023 [Member] €130.0 Million Cross-Over Financing, February 2023 Expected proceeds from share issuance, shelf registration Expected Proceeds From Share Issuance, Shelf Registration Expected Proceeds From Share Issuance, Shelf Registration Attribution of expenses by nature to their function [domain] Attribution of expenses by nature to their function [domain] Increase Increase In Lease Liabilities Increase In Lease Liabilities Loss before tax Accounting profit Increase Depreciation, property, plant and equipment including right-of-use assets Non-recognition of deferred tax assets related to tax losses and temporary differences Tax Effect Of Non-Recognition Of Deferred Tax Assets Related To Tax Losses And Temporary Differences Tax Effect Of Non-Recognition Of Deferred Tax Assets Related To Tax Losses And Temporary Differences Property, plant and equipment including right-of-use assets [domain] Property, plant and equipment including right-of-use assets [domain] Subsidiaries [domain] Subsidiaries [domain] Repayments of borrowings, classified as financing activities Repayments of borrowings, classified as financing activities Tranche 5 Tranche Five [Member] Tranche Five Borrowings by name [axis] Borrowings by name [axis] Capital increases Proceeds From Issuing Shares Other Than Through Exercise Of Warrants Proceeds From Issuing Shares Other Than Through Exercise Of Warrants Exclusive licensing contract with the Scripps Research Institute, University of Chicago and Brigham Young University Exclusive Licensing Contract With The Scripps Research Institute, University Of Chicago And Brigham Young University [Member] Exclusive Licensing Contract With The Scripps Research Institute, University Of Chicago And Brigham Young University Payables and other current liabilities Disclosure of trade and other payables [text block] Interest rate collar range Interest Rate Collar Range Interest Rate Collar Range Tranche 2 Tranche Two [Member] Tranche Two AGA-2024-7 AGA-2024-7 [Member] AGA-2024-7 Disclosure of expenses by nature Disclosure of expenses by nature [text block] Conditional advances and PGE Description of accounting policy for borrowings [text block] Disclosure of tax and employee-related payables Disclosure Of Tax And Employee-Related Payables Explanatory [Table Text Block] Disclosure Of Tax And Employee-Related Payables Explanatory NET LOSS FOR THE YEAR Retained earnings, profit (loss) for reporting period [member] Financial liabilities Disclosure of financial instruments [text block] Disclosure of depreciation period of property, plant and equipment Disclosure of detailed information about property, plant and equipment [text block] Exercises Exercise Of Derivative Instruments Exercise Of Derivative Instruments LICENSES Licences [member] Borrowings, interest rate Borrowings, interest rate Cash flows provided by (used in) investing activities Cash flows from (used in) investing activities Final redemption scenario probability Final Redemption Scenario Probability, Measurement Input [Member] Final Redemption Scenario Probability, Measurement Input Disclosure of detailed information about intangible assets [line items] Disclosure of detailed information about intangible assets [line items] Personnel costs Employee benefits expense Kreos & Claret bond loans Kreos 1 & Claret Bond Loans [Member] Kreos 1 & Claret Bond Loans Balances with banks in excess of legally insured limit Balances With Banks In Excess Of Legally Insured Limit Balances With Banks In Excess Of Legally Insured Limit Increase Amortisation, intangible assets other than goodwill Repurchases Repurchases Repurchase Of Derivative Instruments Repurchase Of Derivative Instruments Ebola conditional advance, BPI France Ebola Conditional Advance, BPI France [Member] Ebola Conditional Advance, BPI France Proceeds from issuing other equity instruments Proceeds from issuing other equity instruments PATENTS Copyrights, patents and other industrial property rights, service and operating rights [member] BCE-2016-1 BCE-2016-1 [Member] BCE-2016-1 Changes in working capital requirements Increase (decrease) in working capital Total current assets Current assets Borrowings Borrowings1 [Member] Borrowings by name Vesting percentage per month Vesting Requirements For Share-Based Payment Arrangement, Vesting Percentage Per Month Vesting Requirements For Share-Based Payment Arrangement, Vesting Percentage Per Month RETAINED EARNINGS Retained earnings, excluding profit (loss) for reporting period [member] RNP-VIR conditional advance RNP VIR – Bpifrance RNP-VIR Conditional Advance, BPI [Member] RNP-VIR Conditional Advance, BPI Cash flows provided by (used in) operating activities before change in working capital requirements Cash flows from (used in) operations before changes in working capital Issue of free shares Increase (Decrease) From Free Shares Issued Increase (Decrease) From Free Shares Issued Research tax credit ("CIR") Current Research Tax Credit Receivables Current Research Tax Credit Receivables Types of risks [axis] Types of risks [axis] Lease facilities, Paris Lease Facilities, Paris [Member] Lease Facilities, Paris Disclosure of net financial income (loss) Disclosure Of Detailed Information About Finance Income (Cost) [Table Text Block] Disclosure Of Detailed Information About Finance Income (Cost) Going concern Description Of Accounting Policy For Going Concern [Policy Text Block] Description Of Accounting Policy For Going Concern Share-based payment Tax Effect Of Share-Based Payment Tax Effect Of Share-Based Payment BSA-2024-1 and BSA-2024-2 BSA-2024-1 And BSA-2024-2 [Member] BSA-2024-1 And BSA-2024-2 AGA-2024-6 AGA-2024-6 [Member] AGA-2024-6 Disclosure of transactions between related parties [table] Disclosure of transactions between related parties [table] Disclosure Of Employee Workforce [Table] Disclosure Of Employee Workforce [Table] Disclosure Of Employee Workforce [Table] Financial liabilities, undiscounted cash flows Financial Liabilities, Undiscounted Cash Flows Financial Liabilities, Undiscounted Cash Flows Number of instruments issued subject to non-market performance condition (in shares) Number Of Other Equity Instruments Granted Subject To Non-Market Performance Condition Number Of Other Equity Instruments Granted Subject To Non-Market Performance Condition Tranche 3 Tranche Three [Member] Tranche Three Increase/(decrease) in derivatives and liabilities measured at fair value Adjustments for fair value losses (gains) Capital increase from issuance of ordinary shares (in shares) Increase (Decrease) In Number Of Ordinary Shares Issued Through Capital Increase Increase (Decrease) In Number Of Ordinary Shares Issued Through Capital Increase RISK FREE RATE Risk Free Interest Rate, Other Equity Instruments Granted Risk Free Interest Rate, Other Equity Instruments Granted Transaction costs related to capital increase Payments For (Proceeds From) Share Issue Related Costs (Credit) Payments For (Proceeds From) Share Issue Related Costs (Credit) Attribution of expenses by nature to their function [axis] Attribution of expenses by nature to their function [axis] Income taxes paid (refund) [abstract] Income taxes paid (refund) [abstract] ASSETS AT AMORTIZED COST Financial assets at amortised cost, category [member] Par value per share (in euro per share) Par value per share Disclosure of non-adjusting events after reporting period [table] Disclosure of non-adjusting events after reporting period [table] Property, plant and equipment Disclosure of property, plant and equipment [text block] Repayments Decrease Through Repayments, Liabilities Arising From Financing Activities Decrease Through Repayments, Liabilities Arising From Financing Activities Amendment Flag Amendment Flag Components of equity [domain] Components of equity [domain] Risk-free rate, tender offer Risk-Free Interest Rate, Measurement Input, Tender Offer [Member] Risk-Free Interest Rate, Measurement Input, Tender Offer Number and average number of employees [abstract] Volatility, tender offer Volatility For Shares Measurement Input, Tender Offer [Member] Volatility For Shares Measurement Input, Tender Offer Employee benefits Description of accounting policy for employee benefits [text block] Number of convertible notes converted Number Of Convertible Notes Converted Number Of Convertible Notes Converted Non cash changes: additional leases Increase through new leases, liabilities arising from financing activities Total operating income Revenue and other operating income Temporary difference, unused tax losses and unused tax credits [axis] Temporary difference, unused tax losses and unused tax credits [axis] Gain on derecognition of financial liabilities Gains Arising From Derecognition Of Financial Liabilities Gains Arising From Derecognition Of Financial Liabilities Kreos 1 & 2 bond loans Kreos 1 & 2 Bond Loans [Member] Kreos 1 & 2 Bond Loans Range [domain] Range [domain] Termination benefits Key management personnel compensation, termination benefits Tranches [Domain] Tranches [Domain] Tranches [Domain] Disclosure Of Financial Gain (Loss) [Table] Disclosure Of Financial Gain (Loss) [Table] Disclosure Of Financial Gain (Loss) [Table] Interest income Interest income Recurring fair value measurement Recurring fair value measurement [member] EXPECTED MATURITY Expected Maturity, Other Equity Instruments Granted Expected Maturity, Other Equity Instruments Granted BCE except BCE 2014-2 BCE Except BCE 2014-2 [Member] BCE Except BCE 2014-2 Expiry scenario period, other equity instruments granted Expiry Scenario Period, Other Equity Instruments Granted Expiry Scenario Period, Other Equity Instruments Granted Non-current financial liabilities Non-current financial liabilities Total Expense from share-based payment transactions Exercises of shares warrants Exercises of the Kreos/Claret and other share warrants Increase (decrease) through exercise of warrants, equity Total fair value of MRI, final redemption Final Redemption, Fair Value Of MRI , Measurement Input [Member] Final Redemption, Fair Value Of MRI , Measurement Input Kreos A & B BSA Kreos 1 [Member] Kreos 1 Financial Income (Loss) [Abstract] Financial Income (Loss) Deferred financing costs Deferred Financing Costs, Netting [Member] Deferred Financing Costs, Netting Address Type [Domain] Address Type [Domain] Notional amount Original principal amount Notional amount Number of tranches Number Of Tranches Number Of Tranches Research and development costs recognition, initial measurement, number of criterias Research And Development Costs Recognition, Initial Measurement, Number Of Criterias Research And Development Costs Recognition, Initial Measurement, Number Of Criterias At-The-Market (ATM) Program At-The-Market (ATM) Program [Member] At-The-Market (ATM) Program Performance conditions, minimum financing Borrowings, Performance Conditions, Minimum Financing Borrowings, Performance Conditions, Minimum Financing Currency [Axis] Currency [Axis] Annual percentage of proceeds from sale of intellectual property right Other Financial Liabilities, Annual Percentage Of Proceeds From Sale Of Intellectual Property Right Other Financial Liabilities, Annual Percentage Of Proceeds From Sale Of Intellectual Property Right Diluted loss per share (in euro per share) Diluted earnings (loss) per share Maturity [domain] Maturity [domain] Share capital Description of accounting policy for issued capital [text block] Categories of financial liabilities [axis] Categories of financial liabilities [axis] Disclosure of terms and conditions of share-based payment arrangement [table] Disclosure of terms and conditions of share-based payment arrangement [table] Current prepaid expenses related to CRO Current Prepaid Expenses Related To CRO Current Prepaid Expenses Related To CRO Kreos 2 Kreos 2 [Member] Kreos 2 Board of Directors and Chief Executive Officer Board Of Directors And Chief Executive Officer [Member] Board Of Directors And Chief Executive Officer Disclosure of reconciliation of liabilities arising from financing activities [table] Disclosure of reconciliation of liabilities arising from financing activities [table] Remeasurement Period [Axis] Remeasurement Period [Axis] Remeasurement Period Repayments of conditional advances Repayments of conditional advances Repayments Of Conditional Advances Repayments Of Conditional Advances Exercise price, percentage of premium Exercise Price, Percentage Of Premium Over 15-Day VWAP, Other Equity Instruments Granted Exercise Price, Percentage Of Premium Over 15-Day VWAP, Other Equity Instruments Granted Total fair value of MRI, tender offer Tender Offer, Fair Value Of MRI , Measurement Input [Member] Tender Offer, Fair Value Of MRI , Measurement Input Schedule of earnings per share Earnings per share [text block] Disclosure Of Warrants Arrangements [Line Items] Disclosure Of Warrants Arrangements [Line Items] Disclosure Of Warrants Arrangements Intangible assets other than goodwill [abstract] Counterparty Name [Axis] Counterparty Name [Axis] Option pricing model Option pricing model [member] Disclosure of detailed information about property, plant and equipment [table] Disclosure of detailed information about property, plant and equipment [table] Net defined benefit liability Net defined benefit liability Acquisitions of intangible assets Purchase of intangible assets, classified as investing activities Proceeds from issuing shares and convertible loan notes Proceeds From Issuing Shares And Convertible Loans Notes Proceeds From Issuing Shares And Convertible Loans Notes Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code