Other income - Narrative (Details) € in Thousands, $ in Thousands |
6 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|
|
Jun. 30, 2025
EUR (€)
|
Jun. 30, 2024
EUR (€)
|
Dec. 31, 2024
EUR (€)
|
Dec. 31, 2024
USD ($)
|
Jan. 31, 2024
EUR (€)
|
|
| Other Income [Line Items] | |||||
| Grant income | € 380 | € 366 | |||
| Rett Syndrome Research Trust | |||||
| Other Income [Line Items] | |||||
| Grant income | € 575 | ||||
| Maximum grant receivable for the initial phase of the project | € 1,015 | ||||
| Maximum grant receivable for additional phase of the project | $ | $ 8,150 | ||||
| Receipts | € 0 | ||||