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Other receivables and other assets - Narrative (Details) - EUR (€) € in Thousands | 12 Months Ended | 145 Months Ended |
--- | --- | --- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2025 | Dec. 31, 2023
Disclosure Of Other Receivables And Other Assets [Line Items] |  |  |  |
Proceeds from research tax credit | € 5,640 | € 4,493 | € 41,200 |
Research tax credit ("CIR") | 3,196 | 5,774 | 3,196 | € 4,600
Current prepaid expenses related to CRO | 1,068 | 1,577 | 1,068 | 1,347
Current advances to suppliers | € 2,207 | 2,604 | € 2,207 | 3,567
Kreos & Claret financing, tranche B |  |  |  |
Disclosure Of Other Receivables And Other Assets [Line Items] |  |  |  |
Reclassification of prepaid expenses to carrying value of debt component |  | € 1,546 |  |
Deferred financing costs |  |  |  |
Disclosure Of Other Receivables And Other Assets [Line Items] |  |  |  |
Borrowings |  |  |  | € 3,152

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- Definition The amount of current advances made to suppliers before goods or services are received. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_112_c&doctype=Standard -URIDate 2025-03-27 + Details
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