v3.26.1
Trade receivables and other current assets - Additional Information (Details)
€ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2025
EUR (€)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
EUR (€)
Dec. 31, 2023
EUR (€)
Disclosure of Trade Receivables and Other Current Assets [Line Items]        
Trade receivables € 2,136   € 2,977  
Prepaid expenses 2,318   3,195  
Decrease in other receivables (2,064)   (1,459) € (4,375)
Payments to suppliers for goods and services 1,000   700  
Research tax credit 2,800   3,300 3,900
Increase / (Decrease) in trade and other payables (5,411)   1,959 € 8,675
Janssen        
Disclosure of Trade Receivables and Other Current Assets [Line Items]        
Trade receivables 1,600   2,100  
Supplier        
Disclosure of Trade Receivables and Other Current Assets [Line Items]        
Decrease in other receivables 300      
ICON Plc        
Disclosure of Trade Receivables and Other Current Assets [Line Items]        
Increase / (Decrease) in trade and other payables 2,100      
ICON Plc | Non-clinicals        
Disclosure of Trade Receivables and Other Current Assets [Line Items]        
Increase / (Decrease) in trade and other payables 1,300      
ICON Plc | Vendors Payables        
Disclosure of Trade Receivables and Other Current Assets [Line Items]        
Increase / (Decrease) in trade and other payables 600      
2024 Tax Year        
Disclosure of Trade Receivables and Other Current Assets [Line Items]        
Research tax credit     3,400  
2024 Tax Year | Nanobiotix S.A.        
Disclosure of Trade Receivables and Other Current Assets [Line Items]        
Research tax credit     2,954  
Research tax credit     3,000  
2024 Tax Year | Curadigm SAS        
Disclosure of Trade Receivables and Other Current Assets [Line Items]        
Research tax credit     400  
2025 Tax Year        
Disclosure of Trade Receivables and Other Current Assets [Line Items]        
Research tax credit 3,000      
2025 Tax Year | Nanobiotix S.A.        
Disclosure of Trade Receivables and Other Current Assets [Line Items]        
Research tax credit 2,873      
Research tax credit 2,900      
2025 Tax Year | Curadigm SAS        
Disclosure of Trade Receivables and Other Current Assets [Line Items]        
Research tax credit 200      
Third Party Services        
Disclosure of Trade Receivables and Other Current Assets [Line Items]        
Prepaid expenses 1,200      
Technology Transfer and Technical | Janssen        
Disclosure of Trade Receivables and Other Current Assets [Line Items]        
Trade receivables     700  
Intellectual Property Services | Janssen        
Disclosure of Trade Receivables and Other Current Assets [Line Items]        
Trade receivables     100  
Janssen        
Disclosure of Trade Receivables and Other Current Assets [Line Items]        
Payments to suppliers for goods and services | $   $ 6.4    
MD Anderson Cancer Center, NBTXR3        
Disclosure of Trade Receivables and Other Current Assets [Line Items]        
Prepaid expenses € 1,100   € 1,200