Royalties Royalty Certificates Royalties Royalty Certificates [Member] Royalties Royalty Certificates Financial assets, at fair value Financial assets, at fair value Financial income Adjustments For Other Finance Income Adjustments For Other Finance Income Number of warrants granted (in shares) Number Of Warrants Granted Number Of Warrants Granted Statistical Measurement [Domain] Statistical Measurement [Domain] Weighted average cost of capital, measurement input Weighted average cost of capital, measurement input [member] Disclosure of geographical areas [line items] Disclosure of geographical areas [line items] Borrowings Non-current portion of other non-current borrowings Registered direct offering Registered Direct Offering [Member] Registered Direct Offering Acquisitions of property, plant and equipment Purchase of property, plant and equipment, classified as investing activities TRANSLATION RESERVE Reserve of exchange differences on translation [member] Entity File Number Entity File Number Liabilities arising from financing activities [axis] Liabilities arising from financing activities [axis] Contribution to Group's assets, percentage Contribution To Group's Assets, Percentage Contribution To Group's Assets, Percentage Impairment loss recognised in profit or loss, other intangible assets Impairment loss recognised in profit or loss, intangible assets other than goodwill Other financial assets Total other non-current financial assets Other non-current financial assets 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) Disclosure of reconciliation of intangible assets Disclosure of detailed information about intangible assets [text block] Total operating expenses Operating expenses Operating expense VOLATILITY Expected Volatility, Other Equity Instruments Granted Expected Volatility, Other Equity Instruments Granted Appropriation of prior period net loss Increase (decrease) through appropriation of retained earnings, equity Classes of share capital [axis] Classes of share capital [axis] Borrowings, Exit Fee Amount Borrowings, Exit Fee Amount Borrowings, Exit Fee Amount 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 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] Total shareholders’ equity Equity at beginning of period Equity at end of period Equity Equity AGA-2026-5 AGA-2026-5 [Member] AGA-2026-5 Royalty certificates Royalty Certificates Related Temporary Differences [Member] Royalty Certificates Related Temporary Differences Tranche 3 Tranche Three [Member] Tranche Three Assets Acquisitions [Axis] Assets Acquisitions [Axis] Assets Acquisitions 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 instruments exercised (in shares) Number of instruments vested (in shares) Number of other equity instruments exercised or vested in share-based payment arrangement September Share-Based Compensation Plan [Member] September Share-Based Compensation Plan [Member] September Share-Based Compensation Plan Statement of comprehensive income [abstract] Repayments of conditional advances Proceeds From Conditional Advances Proceeds From Conditional Advances Peak penetration Peak Penetration, Measurement Input [Member] Peak Penetration, Measurement Input Other receivables and assets Other Receivables And Assets [Member] Other Receivables And Assets Statement of changes in equity [line items] Statement of changes in equity [line items] Borrowings, maximum borrowing capacity per tranche Borrowings, Maximum Borrowing Capacity Per Tranche Borrowings, Maximum Borrowing Capacity Per Tranche Other receivables and assets Other assets Purchase price of royalty certificates Royalty Certificates, Repurchase Total Consideration Royalty Certificates, Repurchase Total Consideration Heights convertible notes Heights Convertible Notes [Member] Heights Convertible Notes 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] Disclosure of changes in derivative instruments Disclosure Of Changes In Derivative Financial Instruments [Table Text Block] Disclosure Of Changes In Derivative Financial Instruments Net loss for the period Retained earnings, profit (loss) for reporting period Employees [Abstract] Employees [Abstract] Number of instruments lapsed (in shares) Number of other equity instruments expired in share-based payment arrangement 2025, Tax Year 2025, Tax Year [Member] 2025, Tax Year Disclosure of geographical areas [table] Disclosure of geographical areas [table] Day-one gain on recognition of financial liabilities Gains Arising From Recognition Of Financial Liabilities Gains Arising From Recognition Of Financial Liabilities Sub-contracting, studies and research Sub-Contracting, Studies And Research Expenses Sub-Contracting, Studies And Research Expenses ASSETS AT FAIR VALUE THROUGH PROFIT AND LOSS Financial assets at fair value through profit or loss, category [member] Statement of financial position [abstract] Sales and marketing Sales and marketing expense Changes in provisions Adjustments for provisions Cover [Abstract] Accounting Principles [Abstract] Accounting Principles [Abstract] Accounting Principles [Abstract] Maximum Maximum [Member] Disclosure Of Employee Workforce [Line Items] Disclosure Of Employee Workforce [Line Items] Disclosure Of Employee Workforce [Line Items] Unused reversals Unused reversals Unused provision reversed, other provisions AGA-2025-2 AGA-2025-2 [Member] AGA-2025-2 Other Other adjustments for non-cash items Loss on derecognition of financial liabilities Losses Arising From Derecognition Of Financial Liabilities Losses Arising From Derecognition Of Financial Liabilities Total current liabilities Current liabilities Classes of intangible assets other than goodwill [axis] Classes of intangible assets other than goodwill [axis] Disclosure Of Cash And Cash Equivalents [Table] Disclosure Of Cash And Cash Equivalents [Table] Disclosure Of Cash And Cash Equivalents [Table] Trade and other receivables [abstract] Expenses by nature [abstract] Disclosure of variation in lease liabilities Disclosure Of Leases For Lessee [Table Text Block] Disclosure Of Leases For Lessee Premiums related to share capital Share premium Cash flows provided by (used in) financing activities Cash flows from (used in) financing activities [abstract] Social security and other Current payables on social security and taxes other than income tax Sale Of Stock [Domain] Sale Of Stock [Domain] Sale Of Stock [Domain] 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] Agreement [Domain] Agreement [Domain] Agreement [Domain] Classes of liabilities [domain] Classes of liabilities [domain] 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] Total comprehensive income (loss) for the period Comprehensive income Statement of changes in equity [abstract] Measurement [domain] Measurement [domain] Advances related to CRO contracts Current Advances To CRO Contracts Current Advances To CRO Contracts Basis of preparation Disclosure of basis of preparation of financial statements [text block] Warrants [Axis] Warrants [Axis] Warrants Disclosure of detailed information about financial instruments [line items] Disclosure of detailed information about financial instruments [line items] Document Fiscal Period Focus Document Fiscal Period Focus Significant unobservable input, assets Significant unobservable input, assets 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 BUILDINGS Buildings Buildings [member] TOTAL ASSETS Financial assets Assets Assets Number of instruments issued (in shares) NUMBER OF BSAs (in shares) Number of other equity instruments granted in share-based payment arrangement Number of free shares plans issued Number Of Free Shares Plans Issued Number Of Free Shares Plans Issued Royalty expense Royalty expense 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 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 Cash payment for royalty certificates Cash Payment For Royalty Certificates Cash Payment For Royalty Certificates Warrants subscription Proceeds From Warrants Subscription Proceeds From Warrants Subscription Entity Address, City or Town Entity Address, City or Town RESEARCH AND DEVELOPMENT EXPENSES Research And Development Expenses [Member] Research And Development Expenses STRIKE PRICE PER SHARE (in euro per share) Equity Instrument Strike Price, Other Equity Instruments Granted Equity Instrument Strike Price, Other Equity Instruments Granted SHARE CAPITAL Issued capital Issued capital [member] Geographical areas [axis] Geographical areas [axis] Number of shares lapsed (in shares) Number Of Shares Lapsed Number Of Shares Lapsed Employees Disclosure of information about employees [text block] Classes of other provisions [domain] Classes of other provisions [domain] Liabilities arising from financing activities at beginning of period Liabilities arising from financing activities at end of period Liabilities arising from financing activities Disclosure of quantitative information about right-of-use assets [table] Disclosure of quantitative information about right-of-use assets [table] Losses on financial liabilities at amortised cost Gains (losses) on financial liabilities at amortised cost Notice accounts Other cash and cash equivalents Number of ordinary shares issued (in shares) Increase in number of shares issued (in shares) Increase (decrease) in number of ordinary shares issued Intangible assets Intangible assets other than goodwill The Group Disclosure of general information about financial statements [text block] 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] 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 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 Other receivables and assets Other non-current non-financial assets EQUIPMENT Machinery [member] Disclosure of maturity analysis for derivative financial liabilities [table] Disclosure of maturity analysis for derivative financial liabilities [table] Prepaid expenses Current prepaid expenses 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] ASSETS Assets [abstract] Royalty certificates, undiscounted cash flows Royalty Certificates, Undiscounted Cash Flows Royalty Certificates, Undiscounted Cash Flows BSAs Total BSAs Share Subscription Warrants (BSA) [Member] Share Subscription Warrants (BSA) Increase Increase In Lease Liabilities Increase In Lease Liabilities Royalty certificate, percentage of future sales Royalty Certificate, Percentage Of Future Sales Royalty Certificate, Percentage Of Future Sales Depositary service fees Income From Depositary Service Fees Income From Depositary Service Fees ROU Right-of-use assets [member] Credit spread, measurement input Credit spread, measurement input [member] Advances reimbursed by / (made to) CROs Payments For Advances Reimbursed (Made to) Contract Research Organizations Payments For Advances Reimbursed (Made to) Contract Research Organizations TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY Equity and liabilities United States UNITED STATES Interest-free vendor loan, royalty certificates Interest Free Vendor Loan, Royalty Certificates Interest Free Vendor Loan, Royalty Certificates Property, plant and equipment [abstract] 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 Retained earnings Retained earnings, excluding profit (loss) for reporting period Current assets Current assets [abstract] Par value per share (in euro per share) Share Price Share Price Other Other current payables Entity Address, Postal Zip Code Entity Address, Postal Zip Code Revenue [abstract] Contribution to Group's net profits (losses), percentage Contribution To Group's Net Profits (Losses), Percentage Contribution To Group's Net Profits (Losses), Percentage Non-current assets Non-current assets [abstract] Acquisition Additions other than through business combinations, property, plant and equipment including right-of-use assets General and administrative General and administrative expense Income tax Disclosure of income tax [text block] Non cash changes: repurchase settled in shares Increase (Decrease) Through Repurchase Settled In Shares, Liabilities Arising From Financing Activities Increase (Decrease) Through Repurchase Settled In Shares, Liabilities Arising From Financing Activities Disclosure of defined benefit plans [abstract] Disclosure of defined benefit plans [abstract] 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 Completion of a public offering Completion Of A Public Offering [Member] Completion Of A Public Offering Disclosure of remaining contractual maturities of non-derivative financial liabilities Disclosure of maturity analysis for non-derivative financial liabilities [text block] Effective interest rate Royalty Certificates, Effective Interest Rate Royalty Certificates, Effective Interest Rate Interest paid Interest paid, classified as financing activities Employee-related payables Short-term employee benefits accruals Financial liabilities, undiscounted cash flows Financial Liabilities, Undiscounted Cash Flows Financial Liabilities, Undiscounted Cash Flows 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 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 Foreign exchange loss Foreign exchange loss 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 SOFTWARE Computer software [member] BCEs Total BCEs Founders’ Share Subscription Warrants (BCE) [Member] Founders’ Share Subscription Warrants (BCE) United States of America, Dollars United States of America, Dollars Financial assets and liabilities Disclosure of fair value of financial instruments [text block] SALES AND MARKETING Sales And Marketing Expense [Member] Sales And Marketing Expense PGE Prêt Garanti Par l'Etat (PGE) [Member] Prêt Garanti Par l'Etat (PGE) Cash Cash Related party transactions [abstract] Related party transactions [abstract] Categories of financial liabilities [domain] Categories of financial liabilities [domain] Others Increase (decrease) through other changes, equity LONGER THAN 5 YEARS Later than five years [member] Repayments of non-convertible bond loans Repayments Of Non-Convertible Loans Notes, Classified As Financing Activities Repayments Of Non-Convertible Loans Notes, Classified As Financing Activities Cash flows provided by (used in) investing activities Cash flows from (used in) investing activities [abstract] Interest paid Decrease Through Interest Paid, Liabilities Arising From Financing Activities Decrease Through Interest Paid, Liabilities Arising From Financing Activities Related parties Disclosure of related party [text block] AGA-2026-2 AGA-2026-2 [Member] AGA-2026-2 Prepaid expenses Non-Current Prepaid Expenses Non-Current Prepaid Expenses Intangible assets Disclosure of intangible assets [text block] Statement of compliance Statement of IFRS compliance [text block] Repayment of royalty certificates Repayment Of Royalty Certificates, Classified As Financing Activities Repayment Of Royalty Certificates, Classified As Financing Activities VAT receivables Current value added tax receivables Disposal Disposals, property, plant and equipment including right-of-use assets AGA-2025 AGA-2025 [Member] AGA-2025 Tax and employee-related payables TAX AND EMPLOYEE-RELATED PAYABLES Current Tax And Employee Benefit Liabilities Current Tax And Employee Benefit Liabilities 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 Interest expense on lease liabilities Interest on lease liabilities Interest expense on lease liabilities Share-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] Repurchase settled in cash Decrease Through Repurchase Settled In Cash, Liabilities Arising From Financing Activities Decrease Through Repurchase Settled In Cash, Liabilities Arising From Financing Activities Disclosure of classes of share capital [table] Disclosure of classes of share capital [table] Unobservable inputs [axis] Unobservable inputs [axis] Disclosure Of Cash And Cash Equivalents [Line Items] Disclosure Of Cash And Cash Equivalents [Line Items] Disclosure Of Cash And Cash Equivalents [Line Items] Foreign currency translation differences Other comprehensive income, net of tax, exchange differences on translation of foreign operations Total non-current assets Non-current assets Reconciliation of changes in other provisions [abstract] Reconciliation of changes in other provisions [abstract] Lease facilities Lease Facilities [Member] Lease Facilities Disclosure of maturity analysis for derivative financial liabilities [line items] Disclosure of maturity analysis for derivative financial liabilities [line items] Classes of property, plant and equipment [axis] Classes of property, plant and equipment [axis] Exercise of warrants Proceeds from exercise of warrants Classes of property, plant and equipment [domain] Classes of property, plant and equipment [domain] Cash-generating units [axis] Cash-generating units [axis] Royalty certificates, equity consideration transferred Royalty Certificates, Equity Consideration Transferred Royalty Certificates, Equity Consideration Transferred Entity Address, Country Entity Address, Country Other receivables and assets Disclosure of trade and other receivables [text block] Reconciliation of changes in intangible assets other than goodwill [abstract] Reconciliation of changes in intangible assets other than goodwill [abstract] Other financial assets Total other current financial assets Other current financial assets Payments for advances made to contract research organizations, undiscounted Amount Payments For Advances Made To Contract Research Organizations, Undiscounted Amount Payments For Advances Made To Contract Research Organizations, Undiscounted Amount Kreos & Claret bond loans Kreos 1 & 2 Bond Loans [Member] Kreos 1 & 2 Bond Loans Receivable from Citibank Current Receivables From Citibank Current Receivables From Citibank Borrowings Borrowings [Member] Borrowings CIR payment received CIR Payment Received [Member] CIR Payment Received 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 & Claret financing Kreos & Claret Financing [Member] Kreos & Claret Financing 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] Research tax credit ("CIR") Non-Current Research Tax Credit Receivables Non-Current Research Tax Credit Receivables Share-based payments Disclosure of share-based payment arrangements [text block] Total non-current other receivables and assets Non-Current Other Receivables And Assets Non-Current Other Receivables And Assets Borrowings, number of tranches Borrowings, Number Of Tranches Borrowings, Number Of Tranches Disclosure of detailed information about financial instruments [table] Disclosure of detailed information about financial instruments [table] Number of shares with performance conditions waived (in shares) Number Of Shares With Performance Conditions Waived Number Of Shares With Performance Conditions Waived Geographical areas [domain] Geographical areas [domain] Document Period End Date Document Fiscal Year Focus Adjustments for: Adjustments to reconcile profit (loss) [abstract] Management and assessment of financial risks Disclosure of financial risk management [text block] Financial liabilities-non current portion Non-Current Financial Liabilities [Member] Non-Current Financial Liabilities EXPECTED MATURITY Expected Maturity, Other Equity Instruments Granted Expected Maturity, Other Equity Instruments Granted Kreos A & B & C BSA Kreos A & B & C BSA [Member] Kreos A & B & C BSA Repayments of convertible loan notes Repayments Of Convertible Loans Notes Repayments Of Convertible Loans Notes Receivables due from related parties Receivables due from related parties 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] July 2026 Offering July 2026 Offering [Member] July 2026 Offering Off-Balance Sheet Commitments [Abstract] Off-Balance Sheet Commitments Current financial liabilities Current financial liabilities 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 Financial expenses Financial expenses Finance costs Disclosure of other financial assets Disclosure of financial assets [text block] Current and deferred tax income Adjustments for income tax expense Employee-related receivables Current Receivables for Employee Benefits Current Receivables for Employee Benefits Other operating income Total operating income Other income Classes of other provisions [axis] Classes of other provisions [axis] Disclosure of credit risk exposure [table] Disclosure of credit risk exposure [table] AGA-2026-3 AGA-2026-3 [Member] AGA-2026-3 Accounting principles Disclosure of material accounting policy information [text block] Repayment of PGE Net Proceeds From Sale Of Royalty Certificates Net Proceeds From Sale Of Royalty Certificates 2024, Tax Year 2024, Tax Year [Member] 2024, Tax Year Foreign exchange gains Foreign exchange gain AGAs Total AGAs Free Share Warrants (AGA) [Member] Free Share Warrants (AGA) Interest on royalty certificates Interest Expense On Royalty Certificates Interest Expense On Royalty Certificates Trade payables Current trade payables 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 Entity Central Index Key Entity Central Index Key Repayments Decrease Through Repayments, Liabilities Arising From Financing Activities Decrease Through Repayments, Liabilities Arising From Financing Activities 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] Other financial expense Other finance cost Derivative financial liabilities at beginning of period Derivative financial liabilities at end of period Derivative financial liabilities Disclosure of credit risk exposure [line items] Disclosure of credit risk exposure [line items] Consulting and professional fees Professional fees expense Valuation techniques used in fair value measurement [axis] Valuation techniques used in fair value measurement [axis] Issue of free shares (in shares) Number Of Free Shares Issued Number Of Free Shares Issued Ordinary shares Ordinary shares [member] 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 Interest on convertible loan notes Interest expense on debt instruments issued 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 LIABILITIES AND SHAREHOLDERS' EQUITY Equity and liabilities [abstract] BSA-2026-1 BSA-2026-1 [Member] BSA-2026-1 Proceeds from government grants Proceeds from government grants, classified as financing activities Accrued invoices Accruals classified as current 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 Reconciliation of changes in property, plant and equipment [abstract] Reconciliation of changes in property, plant and equipment [abstract] Discounted cash flow Discounted cash flow [member] Capital increases Proceeds from issuing shares FROM 2 TO 5 YEARS Later than two years and not later than five years [member] LESS THAN 1 YEAR Not later than one year [member] Other receivables and assets Current Receivables And Assets Current Receivables And Assets Kreos & Claret convertible notes (OCABSA) Kreos/Claret BSA Kreos & Claret Financing, Tranche A [Member] Kreos & Claret Financing, Tranche A Operating loss Profit (loss) from operating activities AGA-2026-1 AGA-2026-1 [Member] AGA-2026-1 Other Other current receivables Advances related to CRO contracts Non-Current Advances To CRO Contracts Non-Current Advances To CRO Contracts LIABILITIES AT FAIR VALUE THROUGH PROFIT AND LOSS Financial liabilities at fair value through profit or loss, category [member] Depreciation expense, lease Depreciation Expense, Lease Depreciation Expense, Lease Tranches [Domain] Tranches [Domain] Tranches [Domain] 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 Disclosure of financial assets [line items] Disclosure of financial assets [line items] Property, plant and equipment Property, plant and equipment [member] Deferred tax liabilities Net deferred tax liabilities Net deferred tax liabilities Cash and cash equivalents Cash And Cash Equivalents [Member] Cash And Cash Equivalents Proceeds from borrowings Proceeds from borrowings, classified as financing activities Payments of the lease liabilities Payments of lease liabilities, classified as financing activities Non-cash changes: other fair value remeasurement Increase (decrease) through changes in fair values, liabilities arising from financing activities Retirement benefit obligations Adjustments for increase (decrease) in employee benefit liabilities Increase in fair value (Increase) / decrease in derivatives fair value Losses on change in fair value of derivatives Credit notes Current Receivables From Credit Notes Current Receivables From Credit Notes 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 Other tax and related payments Current Payables On Other Tax And Related Payments Current Payables On Other Tax And Related Payments Disclosure of breakdown of the compensation expenses Explanation of effect of share-based payments on entity's profit or loss [text block] AGA-2025-5 AGA-2025-5 [Member] AGA-2025-5 Entity Registrant Name Entity Registrant Name Other investments Other Current Investments Other Current Investments Basic loss per share (in euro per share) Basic earnings (loss) per share Significant events for the year ended December 31, 2025 and the six-month period ended June 30, 2026 and subsequent events 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 Expense on lease liabilities Expense On Lease Liabilities Expense On Lease Liabilities Tranche 1 Tranche One [Member] Tranche One Measurement [axis] Measurement [axis] Statement of cash flows [abstract] Issue of share warrants Increase (Decrease) Through Issuance of Warrants, Equity Increase (Decrease) Through Issuance of Warrants, Equity 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 Disclosure of financial assets [table] Disclosure of financial assets [table] 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 Sale Of Stock [Axis] Sale Of Stock [Axis] Sale Of Stock Decrease in financial assets at fair value Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, assets Intangible assets other than goodwill [member] Classes of intangible assets other than goodwill [domain] Counterparty Name [Domain] Counterparty Name [Domain] Share-based compensation expenses Adjustments for share-based payments Lease liability, percentage of total Lease Liability, Percentage Of Total Lease Liability, Percentage Of Total Financial Agreement [Axis] Financial Agreement [Axis] Financial Agreement Financial liabilities-current portion Current Financial Liabilities [Member] Current Financial Liabilities Disount rate applied to long-term advances Discount Rate Applied To Long-Term Advances Discount Rate Applied To Long-Term Advances Kreos C BSA Kreos C BSA [Member] Kreos C BSA Current liabilities Current liabilities [abstract] Retirement benefit obligations Disclosure of employee benefits [text block] Other financial liabilities Other Financial Liabilities [Member] Other Financial Liabilities Deposits Long-term deposits All Currencies [Domain] All Currencies [Domain] Shareholders’ equity Equity [abstract] Disclosure of operating segments [abstract] Disclosure of carrying amounts and fair value of financial assets Disclosure of fair value measurement of assets [text block] Tranche 2 Tranche Two [Member] Tranche Two Subclassifications of assets, liabilities and equities [abstract] Classes of share capital [domain] Classes of share capital [domain] 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 POS Probability Of Success, Measurement Input [Member] Probability Of Success, Measurement Input Long-term advances made to CROs Non-Current Advances To CRO Contracts [Member] Non-Current Advances To CRO Contracts Kreos A & B BSA Kreos A & B BSA [Member] Kreos A & B BSA Fair Value Measurement [Abstract] Fair Value Measurement [Abstract] AGA-2026-4 AGA-2026-4 [Member] AGA-2026-4 Proceeds from issue of ordinary shares Proceeds from issue of ordinary shares Number of operating segments Number Of Operating Segments Number Of Operating Segments Financial income Financial income Finance income Classes of financial liabilities [axis] Classes of financial liabilities [axis] Classes of financial liabilities [domain] Classes of financial liabilities [domain] FURNITURE AND COMPUTER EQUIPMENT Furniture And Computer Equipment [Member] Furniture And Computer Equipment Disclosure of other provisions [line items] Disclosure of other provisions [line items] Transaction costs related to capital increase Payments For (Proceeds From) Share Issue Related Costs (Credit) Payments For (Proceeds From) Share Issue Related Costs (Credit) Disclosure of other provisions Disclosure of other provisions [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 Contribution to Group's liabilities, percentage Contribution To Group's Liabilities, Percentage Contribution To Group's Liabilities, Percentage AGA-2025-1 AGA-2025-1 [Member] AGA-2025-1 Disclosure of temporary difference, unused tax losses and unused tax credits [table] Disclosure of temporary difference, unused tax losses and unused tax credits [table] Average number of employees Average number of employees Increases Increase in existing provisions, other provisions Decrease Decrease In Lease Liabilities Decrease In Lease Liabilities Number of treasury shares held (in shares) Number Of Treasury Shares Held Number Of Treasury Shares Held Lease liabilities at beginning of period Lease liabilities at end of period Lease liabilities Lease liabilities Disclosure of financial assets [abstract] 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 Types of contracts [axis] Types of contracts [axis] Non-cash changes: interest expense and other Increase (decrease) through other changes, liabilities arising from financing activities PREMIUMS RELATED TO SHARE CAPITAL Share premium [member] Types of financial liabilities [axis] Types of financial liabilities [axis] Minimum Minimum [Member] Liabilities arising from financing activities [domain] Liabilities arising from financing activities [domain] Disclosure of reconciliation of other equity instruments Disclosure of number and weighted average exercise prices of other equity instruments [text block] Financial liabilities Liabilities Liabilities Vesting period Vesting Requirements For Share-Based Payment Arrangement, Vesting Period Vesting Requirements For Share-Based Payment Arrangement, Vesting Period Share capital Issued capital Royalty certificates, foreign exchange loss on consideration settlement Royalty Certificates, Foreign Exchange Loss On Consideration Settlement Royalty Certificates, Foreign Exchange Loss On Consideration Settlement Disclosure of reconciliation of liabilities arising from financing activities [line items] Disclosure of reconciliation of liabilities arising from financing activities [line items] Number of shares waived (in shares) Number Of Shares Waived Number Of Shares Waived CIR Tax Year [Domain] CIR Tax Year [Domain] CIR Tax Year [Domain] Categories of financial assets [axis] Categories of financial assets [axis] Disclosure of remaining contractual maturities of derivative financial liabilities Disclosure of maturity analysis for derivative financial liabilities [text block] CIR Tax Year [Axis] CIR Tax Year [Axis] CIR Tax Year Title and Position [Axis] Title and Position [Axis] Number of shares outstanding (in shares) Number of shares outstanding Royalty certificates Royalty Certificates [Member] Royalty Certificates Types of financial liabilities [domain] Types of financial liabilities [domain] Other provisions at beginning of period Other provisions at end of period Other provisions Other financial assets Disclosure of other assets [text block] Increase / (decrease) in trade payables Adjustments for increase (decrease) in trade accounts payable Total financial liabilities Financial liabilities Interest on bond loans Interest expense on bonds Income tax Tax expense (income) Proceeds from research tax credit Proceeds From Research Tax Credit Proceeds From Research Tax Credit Lease liabilities Lease liabilities [member] Advances to CRO contracts, undiscounted amount Non-Current Advances To CRO Contracts, Undiscounted Amount Non-Current Advances To CRO Contracts, Undiscounted Amount Cash-generating units [domain] Cash-generating units [domain] AGA-2026-6 [Member] AGA-2026-6 [Member] AGA-2026-6 Disclosure of events after reporting period [text block] Disclosure of events after reporting period [text block] 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 Borrowings, Deposit Borrowings, Deposit Borrowings, Deposit 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] 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 Current Fiscal Year End Date Document Period End Date Share-based compensation expense Expense from equity-settled share-based payment transactions Current prepaid expenses related to capital increase Current Prepaid Expenses Related To Capital Increase Current Prepaid Expenses Related To Capital Increase Borrowings, fixed conversion price (euro per share) Borrowings, Fixed Conversion Price Borrowings, Fixed Conversion Price Trade payables and other current liabilities Trade Payables And Other Current Liabilities [Member] Trade Payables And Other Current Liabilities Non-adjusting events after reporting period [axis] Non-adjusting events after reporting period [axis] Non-adjusting events after reporting period [domain] Non-adjusting events after reporting period [domain] Disclosure of classes of share capital [line items] Disclosure of classes of share capital [line items] 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 Valuation techniques used in fair value measurement [domain] Valuation techniques used in fair value measurement [domain] Conditional advances Bpifrance Banque Publique d’Investissement (BPI) [Member] Banque Publique d’Investissement (BPI) Goodwill and impairment test Disclosure of goodwill [text block] Maturity [axis] Maturity [axis] Net proceeds from issuance of ordinary shares Net Proceeds From Issue Of Ordinary Shares Net Proceeds From Issue Of Ordinary Shares Other Other inflows (outflows) of cash, classified as financing activities Top of range Top of range [member] Intangible assets and goodwill [abstract] Research and development Research and development expense Goodwill Goodwill Foreign exchange losses Foreign Exchange Losses Foreign Exchange Losses1 Actuarial gains and losses on retirement benefit obligations Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans Document Type Document Type Expense from share-based payment transactions with employees Expense from share-based payment transactions with employees SUBSCRIPTION PRICE (in euro per share) Equity Instrument Price, Other Equity Instruments Granted Equity Instrument Price, Other Equity Instruments Granted Repayment of PGE Repayments Of PGE Repayments Of PGE Gross lease liabilities Gross lease liabilities Going concern Description Of Accounting Policy For Going Concern [Policy Text Block] Description Of Accounting Policy For Going Concern Disclosure Of Lease Liabilities [Table] Disclosure Of Lease Liabilities [Table] Disclosure Of Lease Liabilities [Table] Other sales and marketing expenses Other research and development expenses Other general and administrative expenses Miscellaneous other operating expense 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 Profit or loss [abstract] Statistical Measurement [Axis] Statistical Measurement [Axis] Research tax credit ("CIR") Income From Research Tax Credit Income From Research Tax Credit Share-Based Payment Arrangements [Abstract] Share-Based Payment Arrangements [Abstract] Share-Based Payment Arrangements [Abstract] Disclosure of financial liabilities [abstract] Disclosure of financial liabilities [abstract] Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Classes of assets [axis] Classes of assets [axis] Free Shares (AGA) AGAs AGAs Free Shares (AGA) [Member] Free Shares (AGA) Borrowings by name [domain] Borrowings by name [domain] Types of share-based payment arrangements [domain] Types of share-based payment arrangements [domain] Currency risk Currency risk [member] France FRANCE 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] Deferred tax liabilities Deferred tax liabilities Revaluation of cash equivalents measured at fair value Revaluation Of Cash Equivalents Measured At Fair Value Revaluation Of Cash Equivalents Measured At Fair Value Net loss before tax Profit (loss) before tax 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] Provisions Current Other current provisions Number of warrants repurchased (in shares) Number Of Warrants Repurchased Number Of Warrants Repurchased Royalty certificates, cash consideration transferred Royalty Certificates, Cash Consideration Transferred Royalty Certificates, Cash Consideration Transferred RISK FREE RATE Risk Free Interest Rate, Other Equity Instruments Granted Risk Free Interest Rate, Other Equity Instruments Granted 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 Shareholders’ equity Disclosure of share capital, reserves and other equity interest [text block] 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) Number of convertible notes converted Number Of Convertible Notes Converted Number Of Convertible Notes Converted Interest expense on borrowings Interest on PGE Interest expense on borrowings Intellectual property fees Intellectual Property Fees Intellectual Property Fees Operating income Disclosure of other operating income [text block] 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 Kreos/Claret Financing B And C Kreos/Claret Financing B And C [Member] Kreos/Claret Financing B And C Disclosure of other provisions [table] Disclosure of other provisions [table] Provisions Non-current Other non-current provisions Percentage of reasonably possible increase in unobservable input, liabilities Percentage of reasonably possible increase in unobservable input, liabilities Total current other receivables and assets Current Other Receivables And Assets Current Other Receivables And Assets Increase (decrease) in employer tax and social contributions Increase (Decrease) In Employer Tax And Social Contributions Increase (Decrease) In Employer Tax And Social Contributions Effect of the change in foreign currency exchange rates Increase (decrease) through net exchange differences, property, plant and equipment including right-of-use assets Tranches [Axis] Tranches [Axis] Tranches Attribution of expenses by nature to their function [domain] Attribution of expenses by nature to their function [domain] Increase Depreciation, property, plant and equipment including right-of-use assets Disclosure Of Lease Liabilities [Line Items] Disclosure Of Lease Liabilities [Line Items] Disclosure Of Lease Liabilities [Line Items] Property, plant and equipment including right-of-use assets [domain] Property, plant and equipment including right-of-use assets [domain] Repayments of borrowings, classified as financing activities Repayments of borrowings, classified as financing activities 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 OTHER PROVISIONS Miscellaneous other provisions [member] Fair value of other equity instruments Aggregate Fair Value, Other Equity Instruments Outstanding Aggregate Fair Value, Other Equity Instruments Outstanding Borrowings by name [axis] Borrowings by name [axis] Decrease in deposits Proceeds From Reimbursements Of Deposits Proceeds From Reimbursements Of Deposits Disclosure Of Financial Gain (Loss) [Line Items] Disclosure Of Financial Gain (Loss) [Line Items] Disclosure Of Financial Gain (Loss) [Line Items] Discount rate Unobservable Input, Liabilities, Discount Rate Unobservable Input, Liabilities, Discount Rate Current advances to suppliers Current advances to suppliers Disclosure of detailed information about intangible assets [table] Disclosure of detailed information about intangible assets [table] Borrowings Borrowings Disclosure of expenses by nature Disclosure of expenses by nature [text block] NET LOSS FOR THE YEAR Retained earnings, profit (loss) for reporting period [member] Off-balance sheet commitments given and contingent liabilities Disclosure of commitments and contingent liabilities [text block] Financial liabilities Disclosure of financial instruments [text block] Board member Board Member [Member] Board Member Other financial assets Other financial assets Disclosure of reconciliation of property, plant and equipment Disclosure of detailed information about property, plant and equipment [text block] 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 LICENSES Licences [member] Cash flows provided by (used in) investing activities Cash flows from (used in) investing activities Increase (decrease) in cash and cash equivalents Increase (decrease) in cash and cash equivalents after effect of exchange rate changes Transaction costs Transaction Costs Transaction Costs Wittycel SAS Wittycel SAS - ABX196 [Member] Wittycel SAS - ABX196 Disclosure of detailed information about intangible assets [line items] Disclosure of detailed information about intangible assets [line items] Cash flows provided by (used in) financing activities Cash flows from (used in) financing activities Personnel costs Employee benefits expense Increase Amortisation, intangible assets other than goodwill 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] Changes in working capital requirements Increase (decrease) in working capital Total current assets Current assets AMORTIZATION Accumulated depreciation, amortisation and impairment [member] Payables, other current liabilities and provisions Disclosure Of Trade And Other Payables And Provisions Explanatory [Text Block] Disclosure Of Trade And Other Payables And Provisions Explanatory Royalty certificates Non-Current Royalty Certificates Non-Current Royalty Certificates AGA EMPLOYER CONTRIBUTIONS AND TAXES AGA Employer Contributions And Taxes [Member] AGA Employer Contributions And Taxes Statement of changes in equity [table] Statement of changes in equity [table] RETAINED EARNINGS Retained earnings, excluding profit (loss) for reporting period [member] Disclosure of average workforce during the periods Disclosure Of Average Number Of Employees [Table Text Block] Disclosure Of Average Number Of Employees 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 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 Types of risks [axis] Types of risks [axis] GENERAL AND ADMINISTRATIVE EXPENSES General And Administrative Expense [Member] General And Administrative Expense Interest expenses and other financial expenses Adjustments For Other Finance Costs Adjustments For Other Finance Costs 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 Classes of assets [domain] Classes of assets [domain] Document Period End Date Current Fiscal Year End Date Settlement agreement (Protocole d’accord transactionnel) Settlement Agreement (Protocole D’accord Transactionnel) [Member] Settlement Agreement (Protocole D’accord Transactionnel) Cash equivalents Cash equivalents Bottom of range Bottom of range [member] Increase/(decrease) in derivatives and liabilities measured at fair value Adjustments for fair value losses (gains) Borrowings, Discount Rate Borrowings, Discount Rate Borrowings, Discount Rate Royalty certificate, maximum amount Royalty Certificate, Maximum Amount Royalty Certificate, Maximum Amount 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 Attribution of expenses by nature to their function [axis] Attribution of expenses by nature to their function [axis] LIABILITIES AT AMORTIZED COST Financial liabilities at amortised cost, category [member] Disclosure of detailed information about borrowings [line items] Disclosure of detailed information about borrowings [line items] 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 Current prepaid expenses related to CRO Current Prepaid Expenses Related To CRO Current Prepaid Expenses Related To CRO 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] Net loss for the period Profit (loss) Net loss for the period Profit (loss) Amendment Flag Amendment Flag Components of equity [domain] Components of equity [domain] Disclosure Of Financial Gain (Loss) [Table] Disclosure Of Financial Gain (Loss) [Table] Disclosure Of Financial Gain (Loss) [Table] 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) Total non-current liabilities Non-current liabilities ADS American Depository Shares [Member] American Depository Shares Closing foreign exchange rate Closing foreign exchange rate Technology- based intangible assets, assets acquisitions Technology- Based Intangible Assets, Assets Acquisitions Technology- Based Intangible Assets, Assets Acquisitions 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 Disclosure Of Employee Workforce [Table] Disclosure Of Employee Workforce [Table] Disclosure Of Employee Workforce [Table] Segment information Disclosure of entity's operating segments [text block] Increase in deposits Cash Payments For Deposits Cash Payments For Deposits 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] Research tax credit ("CIR") Current Research Tax Credit Receivables Current Research Tax Credit Receivables Provisions used Provision used, other provisions Temporary difference, unused tax losses and unused tax credits [domain] Temporary difference, unused tax losses and unused tax credits [domain] Financial Risk Management [Abstract] Financial Risk Management [Abstract] Kreos/Claret Minimal Return Indemnifications Kreos & Claret Minimum Return Indemnifications [Member] Kreos & Claret Minimum Return Indemnifications Range [domain] Range [domain] Key management personnel compensation, termination benefits Key management personnel compensation, termination benefits Capital commitments Capital commitments Trade and other current payables [abstract] DEPRECIATION Accumulated depreciation and amortisation [member] Assets Acquisitions [Domain] Assets Acquisitions [Domain] Assets Acquisitions [Domain] 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 Interest income Interest income Conversion of Kreos OCABSA and heights notes Increase (decrease) through conversion of convertible instruments, equity FROM 1 TO 2 YEARS Later than one year and not later than two years [member] Recurring fair value measurement Recurring fair value measurement [member] Financial Income (Loss) [Abstract] Financial Income (Loss) July share-based compensation plan July Share-Based Compensation Plan [Member] July Share-Based Compensation Plan Change 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 Agreement [Axis] Agreement [Axis] Agreement Financial liabilities—non-current portion Non-current financial liabilities Non-current financial liabilities Total Expense from share-based payment transactions Other financial assets Other Financial Assets [Member] Other Financial Assets Exercises of share warrants Increase (decrease) through exercise of warrants, equity Increase (decrease) through exercise of warrants, equity Issue of free shares Increase (Decrease) From Free Shares Issued Increase (Decrease) From Free Shares Issued Categories of financial assets [domain] Categories of financial assets [domain] Warrants [Domain] Warrants [Domain] Warrants Disclosure Of Other Receivables And Other Assets [Table] Disclosure Of Other Receivables And Other Assets [Table] Disclosure Of Other Receivables And Other Assets [Table] Carrying amount [member] Carrying amount [member] Percentage of reasonably possible increase in unobservable input, assets Percentage of reasonably possible increase in unobservable input, assets Prosynergia Prosynergia [Member] Prosynergia 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 Notional amount Notional amount Unobservable inputs [domain] Unobservable inputs [domain] Changes in equity [abstract] Changes in equity [abstract] Increase / (decrease) in other assets / (liabilities) 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 Vesting percentage Vesting Requirements For Share-Based Payment Arrangement, Vesting Percentage Vesting Requirements For Share-Based Payment Arrangement, Vesting Percentage Financial Agreement [Domain] Financial Agreement [Domain] Financial Agreement [Domain] 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] Key Management Personnel Compensation, Contractual Severance Indemnity Key Management Personnel Compensation, Contractual Severance Indemnity Key Management Personnel Compensation, Contractual Severance Indemnity Foreign exchange gains (losses) on translation of foreign operations Foreign Exchange Gains (Losses) On Translation Of Foreign Operations Foreign Exchange Gains (Losses) On Translation Of Foreign Operations Currency [Axis] Currency [Axis] Diluted loss per share (in euro per share) Diluted earnings (loss) per share Maturity [domain] Maturity [domain] Retirement benefit obligations Non-current provisions for employee benefits Right-of-use assets Right-of-use assets 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] Disclosure of reconciliation of liabilities arising from financing activities [table] Disclosure of reconciliation of liabilities arising from financing activities [table] At fair value At fair value [member] Schedule of earnings per share Earnings per share [text block] Intangible assets other than goodwill [abstract] 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 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 Counterparty Name [Axis] Counterparty Name [Axis] Disclosure of detailed information about property, plant and equipment [table] Disclosure of detailed information about property, plant and equipment [table]