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Financial liabilities - Narrative (Details) € in Thousands |  | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 10, 2020 EUR (€) quarterly_installment | Jun. 30, 2020 EUR (€) | Jun. 30, 2025 EUR (€) | Jun. 30, 2024 EUR (€) | Dec. 31, 2018 EUR (€) | Dec. 31, 2024 EUR (€) | Oct. 12, 2023 EUR (€) | Jul. 31, 2018
Disclosure Of Detailed Information About Financial Liabilities [Line Items] |  |  |  |  |  |  |  |
Repayments of borrowings, classified as financing activities |  |  | € 1,926 | € 1,525 |  |  |  |
Increase in loans and conditional advances |  |  | 0 | 0 |  |  |  |
Interest costs |  |  | 4,174 | 3,772 |  |  |  |
HSBC “PGE” |  |  |  |  |  |  |  |
Disclosure Of Detailed Information About Financial Liabilities [Line Items] |  |  |  |  |  |  |  |
Notional amount |  | € 5,000 |  |  |  |  |  |
Borrowing, interest rate |  | 0.31% |  |  |  |  |  |
Repayments of borrowings, classified as financing activities |  |  |  | 600 |  |  |  |
Bpifrance “PGE” |  |  |  |  |  |  |  |
Disclosure Of Detailed Information About Financial Liabilities [Line Items] |  |  |  |  |  |  |  |
Notional amount |  | € 5,000 |  |  |  |  |  |
Borrowing, interest rate | 2.25% |  |  |  |  |  |  |
Repayments of borrowings, classified as financing activities |  |  | 600 |  |  |  |  |
Increase in loans and conditional advances | € 5,000 |  |  |  |  |  |  |
Borrowing, maturity | 6 years |  |  |  |  |  |  |
Percentage of state-guaranteed loan | 0.90 |  |  |  |  |  |  |
Borrowing, guarantee fee | 1.61% |  |  |  |  |  |  |
Number of quarterly instalments | quarterly_installment | 20 |  |  |  |  |  |  |
EIB Loan |  |  |  |  |  |  |  |
Disclosure Of Detailed Information About Financial Liabilities [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  | 43,500 |  |  | € 40,600 |  |
Borrowing, interest rate |  |  |  |  |  |  |  | 21.30%
Repayments of borrowings, classified as financing activities |  |  | 200 |  |  |  |  |
Increase in outstanding loans |  |  | 2,800 |  |  |  |  |
Interest costs |  |  | 4,100 |  |  |  |  |
Impact of accretion and discounting |  |  | 1,000 | 2,700 |  |  |  |
Adjustment to debt financing related to estimated debt outflows |  |  | 2,400 | 10,800 |  |  |  |
Increase (decrease) related to adjustments for income forecast projections |  |  | € 1,400 | € 13,500 |  |  |  |
Market rate estimated percent |  |  | 19.20% |  |  |  |  |
Borrowings |  |  | € 97,800 |  |  |  |  |
Borrowings, cumulative milestone prepayment amount |  |  |  |  |  |  | € 100,000 |
Estimated royalty payments |  |  | € 45,100 |  |  |  |  |
Consolidated forecasted sales, period |  |  | 6 years |  |  |  |  |
EIB Loan | Principal and Fixed Rate |  |  |  |  |  |  |  |
Disclosure Of Detailed Information About Financial Liabilities [Line Items] |  |  |  |  |  |  |  |
Borrowings |  |  | € 33,700 |  |  |  |  |
EIB Loan | Milestone Payment |  |  |  |  |  |  |  |
Disclosure Of Detailed Information About Financial Liabilities [Line Items] |  |  |  |  |  |  |  |
Borrowings |  |  | 19,000 |  |  |  |  |
EIB Loan | At fair value |  |  |  |  |  |  |  |
Disclosure Of Detailed Information About Financial Liabilities [Line Items] |  |  |  |  |  |  |  |
Notional amount |  |  | € 46,500 |  |  |  |  |
Banque Publique d’Investissement |  |  |  |  |  |  |  |
Disclosure Of Detailed Information About Financial Liabilities [Line Items] |  |  |  |  |  |  |  |
Advances, interest rate |  |  |  |  | 1.56% |  |  |
Repayments of current borrowings |  |  |  |  | € 600 |  |  |
Reimbursed amount of corresponds |  |  |  |  | € 1,000 |  |  |
Bpifrance |  |  |  |  |  |  |  |
Disclosure Of Detailed Information About Financial Liabilities [Line Items] |  |  |  |  |  |  |  |
Repayments of current borrowings |  | 100 |  |  |  |  |  |
Reimbursed amount of corresponds |  | 300 |  |  |  |  |  |
Authorized amount to be advanced |  | 500 |  |  |  |  |  |
Advances received |  | € 400 |  |  |  |  |  |

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