Revenue - Summary of changes in current and non-current deferred revenue (Details) - EUR (€) € in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| Disclosure of disaggregation of revenue from contracts with customers [line items] | ||
| Current and non-current deferred income at beginning of period | € 51,371 | |
| Current and non-current deferred income at end of period | 38,946 | € 51,371 |
| Eli Lilly and Company | ||
| Disclosure of disaggregation of revenue from contracts with customers [line items] | ||
| Current and non-current deferred income at beginning of period | 50,930 | 64,739 |
| Addition of milestones achieved | 3,922 | 5,096 |
| Revenue recognized | (15,906) | (18,905) |
| Current and non-current deferred income at end of period | € 38,946 | € 50,930 |