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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, 2021
Dec. 31, 2020
Disclosure of Trade Receivables and Other Current Assets [Line Items]    
Research tax credit receivable at beginning of period € 1,927 € 5,688
Research tax credit receivable at end of period 2,490 1,927
2018 Tax Year | Nanobiotix S.A.    
Disclosure of Trade Receivables and Other Current Assets [Line Items]    
Refund of research tax credit   (3,251)
2019 Tax Year | Nanobiotix S.A.    
Disclosure of Trade Receivables and Other Current Assets [Line Items]    
Refund of research tax credit   (2,374)
2019 Tax Year | Curadigm SAS    
Disclosure of Trade Receivables and Other Current Assets [Line Items]    
Refund of research tax credit   (64)
2020 Tax Year    
Disclosure of Trade Receivables and Other Current Assets [Line Items]    
Research tax credit   1,900
2020 Tax Year | Nanobiotix S.A.    
Disclosure of Trade Receivables and Other Current Assets [Line Items]    
Refund of research tax credit (1,858)  
Research tax credit   1,858
2020 Tax Year | Curadigm SAS    
Disclosure of Trade Receivables and Other Current Assets [Line Items]    
Refund of research tax credit (69)  
Research tax credit   € 69
2021 Tax Year    
Disclosure of Trade Receivables and Other Current Assets [Line Items]    
Research tax credit 2,500  
2021 Tax Year | Nanobiotix S.A.    
Disclosure of Trade Receivables and Other Current Assets [Line Items]    
Research tax credit 2,272  
2021 Tax Year | Curadigm SAS    
Disclosure of Trade Receivables and Other Current Assets [Line Items]    
Research tax credit € 218