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Operating expenses - Disclosure of Other Operating Income (Expense) (Details) € in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2024 EUR (€) | Dec. 31, 2023 EUR (€) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 EUR (€)
Analysis of income and expense [abstract] |  |  |  |
Other operating expenses | € (136) | € (2,542) |  | € (985)
Other operating income | 3 | 0 |  | 0
Total Other operating income and expenses | (134) | (2,542) |  | (985)
Disclosure Of Operating Expenses [Line Items] |  |  |  |
Termination benefits expense | 129 | 700 |  |
Revenues | (11,609) | 30,058 |  | € 0
Janssen |  |  |  |
Disclosure Of Operating Expenses [Line Items] |  |  |  |
Revenues | € (1,600) | € (1,600) |  |
Termination of PharmaEngine License and Collaboration Agreement, NBTXR3 |  |  |  |
Disclosure Of Operating Expenses [Line Items] |  |  |  |
Contract termination indemnities | $ |  |  | $ 1.0 |

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- Definition The amount of miscellaneous other operating expenses. [Refer: Other operating income (expense)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of operating income (expense) that the entity does not separately disclose in the same statement or note. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 85 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_85&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2024-01-01 -Paragraph 114 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_114&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2024-01-01 -Paragraph 113 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_113_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of expense in relation to termination benefits. Termination benefits are employee benefits provided in exchange for the termination of an employee's employment as a result of either: (a) an entity's decision to terminate an employee's employment before the normal retirement date; or (b) an employee's decision to accept an offer of benefits in exchange for the termination of employment. [Refer: Employee benefits expense] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 171 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_171&doctype=Standard -URIDate 2024-03-27 + Details
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