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Disclosure - Notes to the unaudited interim condensed consolidated statement of financial position - Cash and Cash equivalents balance from the statement of cash flows (Details) link:presentationLink link:calculationLink link:definitionLink 40416 - Disclosure - Notes to the unaudited interim condensed consolidated statement of financial position - Debt, Derivatives and Royalty Certificates liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 40417 - Disclosure - Notes to the unaudited interim condensed consolidated statement of financial position - Changes in liabilities arising from financing activities (Details) link:presentationLink link:calculationLink link:definitionLink 40428 - Disclosure - Notes to the unaudited interim condensed consolidated statement of financial position - Breakdown of expense recognized for the period (Details) link:presentationLink link:calculationLink link:definitionLink 40429 - Disclosure - Notes to the unaudited interim condensed consolidated statement of financial position - Other current and non-current liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 40431 - Disclosure - Notes to the unaudited interim condensed consolidated statement of financial position - Trade payables (Details) link:presentationLink link:calculationLink link:definitionLink 40501 - Disclosure - Notes to the interim condensed consolidated statement of income (loss) - Revenues and other income (Details) link:presentationLink link:calculationLink link:definitionLink 40503 - Disclosure - Notes to the interim condensed consolidated statement of income (loss) - Operating expenses (Details) link:presentationLink link:calculationLink link:definitionLink 40504 - Disclosure - Notes to the interim condensed consolidated statement of income (loss) - Personnel costs and headcount (Details) link:presentationLink link:calculationLink link:definitionLink 40505 - Disclosure - Notes to the interim condensed consolidated statement of income (loss) - Other operating income and expenses (Details) link:presentationLink link:calculationLink link:definitionLink 40507 - Disclosure - Notes to the interim condensed consolidated statement of income (loss) - Financial income and expenses (Details) link:presentationLink link:calculationLink link:definitionLink 40508 - Disclosure - Notes to the interim condensed consolidated statement of income (loss) - Share of net profit - Equity method (Details) link:presentationLink link:calculationLink link:definitionLink 00090 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 00400 - Statement - Interim condensed consolidated statement of changes in shareholders' equity link:presentationLink link:calculationLink link:definitionLink 00405 - Statement - Interim condensed consolidated statement of changes in shareholders' equity (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 00505 - Statement - Interim condensed consolidated statement of cash flows (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 30403 - Disclosure - Notes to the unaudited interim condensed consolidated statement of financial position (Tables) link:presentationLink link:calculationLink link:definitionLink 40101 - Disclosure - Company information (Details) link:presentationLink link:calculationLink link:definitionLink 40102 - Disclosure - Company information - Combined transaction (Details) link:presentationLink link:calculationLink link:definitionLink 40103 - Disclosure - Company information - Debt Financing Transactions (Details) link:presentationLink link:calculationLink link:definitionLink 40201 - Disclosure - Basis of preparation and statement of compliance - Significant investments in subsidiaries (Details) link:presentationLink link:calculationLink link:definitionLink 40301 - Disclosure - Accounting principles - Fair value measurement (Details) link:presentationLink link:calculationLink link:definitionLink 40302 - Disclosure - Accounting principles - Going concern (Details) link:presentationLink link:calculationLink link:definitionLink 40401 - Disclosure - Notes to the unaudited interim condensed consolidated statement of financial position - Intangible assets and Property, plant and equipment (Details) link:presentationLink link:calculationLink link:definitionLink 40402 - Disclosure - Notes to the unaudited interim condensed consolidated statement of financial position - Investments accounted for using the equity method (Details) link:presentationLink link:calculationLink link:definitionLink 40403 - Disclosure - Notes to the unaudited interim condensed consolidated statement of (income) loss - Investment in Hepalys is accounted for using the equity method (Details) link:presentationLink link:calculationLink link:definitionLink 40405 - Disclosure - Notes to the unaudited interim condensed consolidated statement of financial position - Trade Receivables (Details) link:presentationLink link:calculationLink link:definitionLink 40407 - Disclosure - Notes to the unaudited interim condensed consolidated statement of financial position - Other (Details) link:presentationLink link:calculationLink link:definitionLink 40409 - Disclosure - Notes to the unaudited interim condensed consolidated statement of financial position - Shareholders' Equity (Details) link:presentationLink link:calculationLink link:definitionLink 40410 - Disclosure - Notes to the unaudited interim condensed consolidated statement of financial position - Shareholders' equity - Changes in share capital (Details) link:presentationLink link:calculationLink link:definitionLink 40411 - Disclosure - Notes to the unaudited interim condensed consolidated statement of financial position - Liquidity agreement (Details) link:presentationLink link:calculationLink link:definitionLink 40412 - Disclosure - Notes to the unaudited interim condensed consolidated statement of financial position - Movements in BSPCE and BSA share warrants (Details) link:presentationLink link:calculationLink link:definitionLink 40413 - Disclosure - Notes to the unaudited interim condensed consolidated statement of financial position - Movements in AGA (Details) link:presentationLink link:calculationLink link:definitionLink 40414 - Disclosure - Notes to the unaudited interim condensed consolidated statement of financial position - Stock Options (SO) (Details) link:presentationLink link:calculationLink link:definitionLink 40415 - Disclosure - Notes to the unaudited interim condensed consolidated statement of financial position - Forward contract relating to the New EIB Warrants (Details) link:presentationLink link:calculationLink link:definitionLink 40418 - Disclosure - Notes to the unaudited interim condensed consolidated statement of financial position - French state-guaranteed loan ("PGE") and equity recovery loans ("PPR") (Details) link:presentationLink link:calculationLink link:definitionLink 40419 - Disclosure - Notes to the unaudited interim condensed consolidated statement of financial position - Credit facility agreement with the European Investment Bank (Details) link:presentationLink link:calculationLink link:definitionLink 40420 - Disclosure - Notes to the unaudited interim condensed consolidated statement of financial position - Lease liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 40421 - Disclosure - Notes to the unaudited interim condensed consolidated statement of financial position - Long-term Derivatives (Details) link:presentationLink link:calculationLink link:definitionLink 40422 - Disclosure - Notes to the unaudited interim condensed consolidated statement of financial position - Long-term Derivatives - Warrants (Details) link:presentationLink link:calculationLink link:definitionLink 40423 - Disclosure - Notes to the unaudited interim condensed consolidated statement of financial position - Short-term Derivative (Details) link:presentationLink link:calculationLink link:definitionLink 40424 - Disclosure - Notes to the unaudited interim condensed consolidated statement of financial position - Royalty Certificates liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 40425 - Disclosure - Notes to the unaudited interim condensed consolidated statement of financial position - Provisions (Details) link:presentationLink link:calculationLink link:definitionLink 40426 - Disclosure - Notes to the unaudited interim condensed consolidated statement of financial position - Net provision (Details) link:presentationLink link:calculationLink link:definitionLink 40427 - Disclosure - Notes to the unaudited interim condensed consolidated statement of financial position - Changes in the net provision (Details) link:presentationLink link:calculationLink link:definitionLink 40430 - Disclosure - Notes to the unaudited interim condensed consolidated statement of financial position - Additional information (Details) link:presentationLink link:calculationLink link:definitionLink 40432 - Disclosure - Notes to the unaudited interim condensed consolidated statement of financial position - Trade payables break down (Details) link:presentationLink link:calculationLink link:definitionLink 40433 - Disclosure - Notes to the unaudited interim condensed consolidated statement of financial position - Financial assets and liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 40506 - Disclosure - Notes to the interim condensed consolidated statement of income (loss) - Additional Information (Details) link:presentationLink link:calculationLink link:definitionLink 40509 - Disclosure - Notes to the interim condensed consolidated statement of income (loss) - Income tax (Details) link:presentationLink link:calculationLink link:definitionLink 40601 - Disclosure - Other financial information - Commitments given and received (Details) link:presentationLink link:calculationLink link:definitionLink 40602 - Disclosure - Other financial information - Financial risk management (Details) link:presentationLink link:calculationLink link:definitionLink 00205 - Statement - Interim condensed consolidated statement of income (loss) (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 10101 - Disclosure - Company information link:presentationLink link:calculationLink link:definitionLink 10201 - Disclosure - Basis of preparation and statement of compliance link:presentationLink link:calculationLink link:definitionLink 10301 - Disclosure - Accounting principles link:presentationLink link:calculationLink link:definitionLink 10401 - Disclosure - Notes to the unaudited interim condensed consolidated statement of financial position link:presentationLink link:calculationLink link:definitionLink 10501 - Disclosure - Notes to the interim condensed consolidated statement of income (loss) link:presentationLink link:calculationLink link:definitionLink 10601 - Disclosure - Other financial information link:presentationLink link:calculationLink link:definitionLink 20302 - Disclosure - Accounting principles (Policies) link:presentationLink link:calculationLink link:definitionLink 30203 - Disclosure - Basis of preparation and statement of compliance (Tables) link:presentationLink link:calculationLink link:definitionLink 30303 - Disclosure - Accounting Principles (Tables) link:presentationLink link:calculationLink link:definitionLink 30503 - Disclosure - Notes to the interim condensed consolidated statement of income (loss) (Tables) link:presentationLink link:calculationLink link:definitionLink 30603 - Disclosure - Other financial information (Tables) link:presentationLink link:calculationLink link:definitionLink 40202 - Disclosure - Basis of preparation and statement of compliance - Foreign exchange rates (Details) link:presentationLink link:calculationLink link:definitionLink 40510 - Disclosure - Notes to the interim condensed consolidated statement of income (loss) - Basic and diluted loss per share (Details) link:presentationLink link:calculationLink link:definitionLink 99900 - Disclosure - Standard And Custom Axis Domain Defaults link:presentationLink link:calculationLink link:definitionLink