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Trade receivables and other current assets - Additional Information (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of Trade Receivables and Other Current Assets [Line Items]    
Prepaid expenses € 2,213 € 2,217
Prepaid expenses related to insurance for Directors and Officers 600  
Current advances to suppliers 3,043 805
2021 Tax Year    
Disclosure of Trade Receivables and Other Current Assets [Line Items]    
Research tax credit 2,500  
2020 Tax Year    
Disclosure of Trade Receivables and Other Current Assets [Line Items]    
Research tax credit   1,900
Nanobiotix S.A. | 2021 Tax Year    
Disclosure of Trade Receivables and Other Current Assets [Line Items]    
Research tax credit 2,272  
Nanobiotix S.A. | 2020 Tax Year    
Disclosure of Trade Receivables and Other Current Assets [Line Items]    
Research tax credit   1,858
Curadigm SAS | 2021 Tax Year    
Disclosure of Trade Receivables and Other Current Assets [Line Items]    
Research tax credit 218  
Curadigm SAS | 2020 Tax Year    
Disclosure of Trade Receivables and Other Current Assets [Line Items]    
Research tax credit   69
MD Anderson Cancer Center, NBTXR3    
Disclosure of Trade Receivables and Other Current Assets [Line Items]    
Prepaid expenses € 1,000 € 1,600