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arrangement Disclosure of sensitivity analysis for actuarial assumptions [line items] Disclosure of sensitivity analysis for actuarial assumptions [line items] Statement of comprehensive income [abstract] Risk Not Hedged Risk Not Hedged [Member] Risk Not Hedged Statement of changes in equity Statement of changes in equity [line items] Non-cash from financing activities Cash Flows From (Used In) Non Financing Activities Cash Flows From (Used In) Non Financing Activities Subsidies Income from government grants Contract Name [Axis] Contract Name [Axis] Contract Name Research tax credit utilization period Research Tax Credit Utilization Period Research Tax Credit Utilization Period Net loss for the period Net loss for the period Retained earnings, profit (loss) for reporting period Disclosure of number and weighted average remaining contractual life of outstanding share options [table] Disclosure of number and weighted average remaining contractual life of outstanding share options [table] 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category [member] OSA & BSPCE OSA & BSPCE [Member] OSA & BSPCE Statement of financial position [abstract] Total impact Total Impact Total Impact Other operating income and expenses Total Other operating income and expenses Other operating income (expense) Cover [Abstract] Disclosure of Trade Payables and Other Current Liabilities [Line Items] Disclosure of Trade Payables and Other Current Liabilities [Line Items] Disclosure of Trade Payables and Other Current Liabilities Maximum Maximum [Member] Current prepayments and current accrued income other than current contract assets [abstract] Current prepayments and current accrued income other than current contract assets [abstract] LianBio, NBTXR3 and Cetuximab LianBio, NBTXR3 And Cetuximab [Member] LianBio, NBTXR3 And Cetuximab Janssen Janssen [Member] Janssen BSA 2015-2 a BSA 2015-2 [Member] BSA 2015-2 Increase in other receivables Decrease in other receivables Adjustments For Decrease (Increase) In Other Receivables Adjustments For 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EIB loan guarantee (as a percent) EIB Loan Guarantee By Subsidiaries Minimum Percentage Of Consolidated Gross Revenues Total Assets Or EBITDA EIB Loan Guarantee By Subsidiaries Minimum Percentage Of Consolidated Gross Revenues Total Assets Or EBITDA Theoretical tax (benefit) expense Tax expense (income) at applicable tax rate Decreases Disposals, property, plant and equipment Technical equipment Machinery [member] Disclosure of number and weighted average remaining contractual life of share options outstanding Disclosure of number and weighted average remaining contractual life of outstanding share options [text block] Sale of stock price Exercise price of outstanding share options Prepaid expenses Current prepaid expenses Repayments of current borrowings Repayments of current borrowings Tangible assets in progress Construction in progress [member] ASSETS Assets [abstract] Potential development and commercial milestones payments Collaboration Agreement, Potential Milestones Payments To Be Received Collaboration Agreement, Potential Milestones Payments To Be Received BSA 2020 BSA 2020 [Member] BSA 2020 Right-of-use assets [member] Right-of-use assets [member] Non-current financial liabilities Non Current Financial Liabilities [Member] Non Current Financial Liabilities Share price (in euros) Weighted average share price, share options granted Current assets Current assets [abstract] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Janssen Janssen Pharmaceutica NV [Member] Janssen Pharmaceutica NV Revenues and other income Revenue [abstract] Non-current assets Non-current assets [abstract] Income tax Disclosure of income tax [text block] Subsequent events Description Of Accounting Policy For Events After Reporting Period [Policy Text Block] Description Of Accounting Policy For Events After Reporting Period Revenue and other income Description of accounting policy for recognition of revenue [text block] Kepler Cheuvreux Subscription Agreement PACEO Kepler Cheuvreux Subscription Agreement PACEO [Member] Kepler Cheuvreux Subscription Agreement PACEO BSA 2018-1 BSA 2018-1 [Member] BSA 2018-1 Net sales -10% Minus Ten Percent [Member] Minus Ten Percent Transaction costs Payments for share issue costs Interest paid Interest paid, classified as financing activities Debt instrument sensitivity analysis, multiple Debt Instrument Sensitivity Analysis, Multiple Debt Instrument Sensitivity Analysis, Multiple Disclosure of Detail of Change in Stock Options Disclosure of number and weighted average exercise prices of share options [text block] Losses on fair value variation Increase (Decrease) On Fair Value Variation Increase (Decrease) On Fair Value Variation OSA 2020 OSA 2020 [Member] OSA 2020 Software Computer software [member] Share-based compensation, service period Share-based Compensation, Service Period Share-based Compensation, Service Period Constrained Transaction Price Constrained Transaction Price Constrained Transaction Price Forecasted sales period Consolidated Forecasted Sales, Period Consolidated Forecasted Sales, Period Cash and bank accounts Cash Related party transactions [abstract] Related party transactions [abstract] OSA 2022-06 O OSA 2022-06 O [Member] OSA 2022-06 O Cash flows from (used in) investing activities Cash flows from (used in) investing activities [abstract] Short-term employee benefits expense Short-term employee benefits expense Stock option exercised period Stock Option Exercised Period Stock Option Exercised Period Risk-free rate Risk free interest rate, share options granted Aggregate nominal value Aggregate Nominal Value Aggregate Nominal Value Repayment of only partial funding received Annual Royalty Repayment, Estimated Partial Final Payment Annual Royalty Repayment, Estimated Partial Final Payment Cash and cash equivalents Description of accounting policy for determining components of cash and cash equivalents [text block] Remaining notional amount Borrowings, Remaining Notional Amount Borrowings, Remaining Notional Amount Proceeds from current borrowings Proceeds from current borrowings Number of shares Reconciliation of number of shares outstanding [abstract] Share based payment Increase (decrease) through share-based payment transactions, equity Advisory fees Advisory Fees Advisory Fees Tranche two Tranche Two [Member] Tranche Two Currency translation adjustments Other comprehensive income, net of tax, exchange differences on translation of foreign operations Total non-current assets Non-current assets Proportion of ownership interest in associate Proportion of ownership interest in associate Change in contract assets due to a 10% increase in exchange rate Sensitivity Analysis For Types Of Market Risk, Increase (Decrease) In Royalty Finanacing Due To Ten Percent Increase In Exchange Rate Sensitivity Analysis For Types Of Market Risk, Increase (Decrease) In Royalty Finanacing Due To Ten Percent Increase In Exchange Rate Disclosure of defined benefit plans [table] Disclosure of defined benefit plans [table] Foreign exchange losses Foreign exchange gain (loss) Classes of property, plant and equipment [axis] Classes of property, plant and equipment [axis] Milestone payment upon receipt of clinical study reports Contractual Commitments, Milestone Payment Upon Receipt Of Clinical Study Reports Contractual Commitments, Milestone Payment Upon Receipt Of Clinical Study Reports Debt Instrument Milestone [Domain] Debt Instrument Milestone [Domain] Debt Instrument Milestone [Domain] Classes of property, plant and equipment [domain] Classes of property, plant and equipment [domain] Actuarial assumptions [domain] Actuarial assumptions [domain] Entity Address, Country Entity Address, Country Share-Based Compensation, Vesting Period Share-Based Compensation, Vesting Period Share-Based Compensation, Vesting Period Reconciliation of changes in intangible assets other than goodwill [abstract] Reconciliation of changes in intangible assets other than goodwill [abstract] Major ordinary share transactions Major ordinary share transactions [member] Effect of exchange rates changes on cash Effect of exchange rate changes on cash and cash equivalents Document Annual Report Document Annual Report Entities [Table] Entities [Table] Research tax credit receivable Research tax credit receivable at beginning of period Research tax credit receivable at end of period Current receivables from taxes other than income tax Disclosure of detailed information about financial instruments [table] Disclosure of detailed information about financial instruments [table] Revenues and other income Disclosure of revenue [text block] Non-current financial assets Non-Current Financial Assets [Member] Non-Current Financial Assets R&D Research And Development Expense 1 [Member] Research And Development Expense 1 Entity Interactive Data Current Entity Interactive Data Current Estimated royalty payments Estimated Royalty Payments Estimated Royalty Payments Tranche three 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Other comprehensive income (loss) that may be reclassified subsequently to income (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] Outstanding at beginning of period (in shares) Outstanding at end of period (in shares) Number of share options outstanding in share-based payment arrangement (in shares) Number of share options outstanding in share-based payment arrangement No Deal Before August 2023 [Member] No Deal Before August 2023 [Member] No Deal Before August 2023 Collaboration agreement, upfront payment license fee Collaboration Agreement, Upfront Payment License Fee Collaboration Agreement, Upfront Payment License Fee LIABILITIES AND SHAREHOLDER’S EQUITY Equity and liabilities [abstract] Decrease in accrued expenses Adjustments For Increase (Decrease) In Accrued Expenses Adjustments For Increase (Decrease) In Accrued Expenses Third Party Services Third Party 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Repayment Threshold Annual Royalty Repayment Threshold Ownership [Axis] Ownership [Axis] Clinical Studies [Domain] Clinical Studies [Domain] Clinical Studies [Domain] First installment period Borrowings, Milestone Payment, First Installment Period Borrowings, Milestone Payment, First Installment Period MD Anderson Cancer Center, NBTXR3 MD Anderson Cancer Center, NBTXR3 [Member] MD Anderson Cancer Center, NBTXR3 Lump-sum retirement benefits Lump-Sum Retirement Benefits [Member] Lump-Sum Retirement Benefits Provisions Disclosure of provisions [text block] Statement of cash flows [abstract] Disclosure of financial assets [table] Disclosure of financial assets [table] Accumulated other comprehensive income Accumulated other comprehensive income Title and Position [Domain] Title and Position [Domain] Number of shares issuable (in shares) Number of other equity instruments exercisable in share-based payment arrangement Net collections Net Collections (Payments) From Related Party Net Collections (Payments) From Related Party Maximum term of options granted for share-based payment arrangement in the event of death or disability of optionee Maximum Term Of Options Granted For Share-Based Payment Arrangement In The Event Of Death Or Disability Of Optionee Maximum Term Of Options Granted For Share-Based Payment Arrangement In The Event Of Death Or Disability Of Optionee BSA 2019-1 BSA 2019-1 [Member] BSA 2019-1 Trade payables and other current liabilities Disclosure Of Trade Payables And Other Current Liabilities [Text Block] Disclosure Of Trade Payables And Other Current Liabilities Counterparty Name [Domain] Counterparty Name [Domain] Disclosure of Trade Receivables and Other Current Assets [Line Items] Disclosure of Trade Receivables and Other Current Assets [Line Items] Disclosure of Trade Receivables and Other Current Assets Expense for the period Post-employment benefit expense in profit or loss, defined benefit plans Hedged items [axis] Hedged items [axis] Collaboration Agreement [Axis] Collaboration Agreement [Axis] Collaboration Agreement AGA 2023 AGA 2023 [Member] AGA 2023 Member Minimum threshold to provide additional know-how to third party under collaboration agreement Minimum Threshold To Provide Additional Know-How To Third Party Under Collaboration Agreement Minimum Threshold To Provide Additional Know-How To Third Party Under Collaboration Agreement Disclosure of Commercialization Date Sensitivity Analysis Commercialization Date Sensitivity Analysis [Table Text Block] Commercialization Date Sensitivity Analysis Increase (decrease) in equity Increase (decrease) in equity Current liabilities Current liabilities [abstract] BSPCE BSPCE [Member] BSPCE Maximum borrowing amount Maximum Borrowing Amount Maximum Borrowing Amount Disclosure of financial instruments by type of interest rate [table] Disclosure of financial instruments by type of interest rate [table] Disclosure of transactions between related parties [line items] Disclosure of transactions between related parties [line items] Amortization expense of intangible assets Amortisation expense Disclosure of number and weighted average remaining contractual life of outstanding share options [table] Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] Total Non-derivative financial liabilities, undiscounted cash flows OSA 2021-06 P OSA 2021-06 Performance [Member] OSA 2021-06 Performance Social security contribution rate Actuarial Assumption Of Social Security Contribution Rates Actuarial Assumption Of Social Security Contribution Rates Disclosure Of Information Related To The Company [Table] Disclosure Of Information Related To The Company [Table] Disclosure Of Information Related To The Company [Table] Salary increase rate (including inflation) Actuarial assumption of expected rates of salary increases Debt Instrument Measurement [Domain] Debt Instrument Measurement [Domain] Debt Instrument Measurement [Domain] Supplier Research Organization (CRO) and to Clinical Services Providers [Member] Research Organization (CRO) and to Clinical Services Providers Capital increases Proceeds from issue of ordinary shares Financial income Total financial income Finance income Classes of financial liabilities [axis] Classes of financial liabilities [axis] OSA 2016-2 OSA 2016-2 [Member] OSA 2016-2 Classes of financial liabilities Classes of financial liabilities [domain] Document Shell Company Report Document Shell Company Report Net impact of accretion, discounting and catch-up on EIB loan Debt Restructuring Valuation Impact Debt Restructuring, Valuation Impact Disclosure of other provisions [line items] Disclosure of other provisions [table] Disclosure of other provisions [line items] Average headcount (employee) Average number of employees Disclosure of refund liabilities Detailed Information About Refund Liabilities [Table Text Block] Detailed Information About Refund Liabilities 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Statistical Measurement [Axis] Second installment period Borrowings, Milestone Payment, Second Installment Period Borrowings, Milestone Payment, Second Installment Period Disclosure of financial liabilities [abstract] Impact of discounting financial liabilities and amortized cost Adjustments for increase (decrease) in derivative financial liabilities Current provisions Current provisions Actuarial assumption of discount rates if rates increase by 25% Actuarial Assumption Of Discount Rates If Rates Increase By 25% Actuarial Assumption Of Discount Rates If Rates Increase By 25% Types of share-based payment arrangements Types of share-based payment arrangements [domain] Number of subsidiaries Number Of Subsidiaries Number Of Subsidiaries Cash flow from (used in) operating activities after tax and before change in working capital requirement Cash Flow From Operating Activities After Tax And Before Change In Working Capital Requirement Cash Flow From Operating Activities After Tax And 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Auditor Location Change in net income due to a 10% increase in exchange rate Sensitivity Analysis For Types Of Market Risk, Increase (Decrease) In Net Income Due To Ten Percent Increase In Exchange Rate Sensitivity Analysis For Types Of Market Risk, Increase (Decrease) In Net Income Due To Ten Percent Increase In Exchange Rate Financial liabilities Disclosure Of Financial Liabilities Footnote [Text Block] Disclosure Of Financial Liabilities Footnote AGA 2020 AGA 2020 [Member] AGA 2020 Products and services Products and services [domain] Segment reporting Disclosure of operating segments [text block] Weighted average number of shares (in shares) Weighted average number of ordinary shares used in calculating basic earnings per share Fair value debt considering amount Installment Payment Installment Payment Annual short term lease expense Annual Short Term Lease Expense Annual Short Term Lease Expense Advances, interest rate Advances Received, Interest Rate Advances Received, Interest 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