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Trade receivables and other current assets - Disclosure of Changes in Research Tax Credit Receivables (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Current prepayments and current accrued income other than current contract assets [abstract]    
Research tax credit receivable at beginning of period € 3,939 € 4,091
Research tax credit receivable at end of period 3,369 3,939
2022 Tax Year | Nanobiotix S.A.    
Current prepayments and current accrued income other than current contract assets [abstract]    
Refund of research tax credit   (3,884)
2022 Tax Year | Curadigm SAS    
Current prepayments and current accrued income other than current contract assets [abstract]    
Refund of research tax credit   (207)
2023 Tax Year | Nanobiotix S.A.    
Current prepayments and current accrued income other than current contract assets [abstract]    
Refund of research tax credit (3,707)  
Research tax credit   3,762
2023 Tax Year | Curadigm SAS    
Current prepayments and current accrued income other than current contract assets [abstract]    
Refund of research tax credit (177)  
Research tax credit   € 177
2024 Tax Year | Nanobiotix S.A.    
Current prepayments and current accrued income other than current contract assets [abstract]    
Research tax credit 2,954  
2024 Tax Year | Curadigm SAS    
Current prepayments and current accrued income other than current contract assets [abstract]    
Research tax credit € 360