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Operating expenses - Disclosure of Other Operating Income (Expense) (Details)
€ in Thousands, $ in Millions
 12 Months Ended
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