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Income tax (Tables)
12 Months Ended
Dec. 31, 2021
Income taxes paid (refund) [abstract]  
Schedule of reconciliation between statutory and effective income tax
The following table reconciles the Company’s theoretical tax expense to its effective tax expense:

For the year ended December 31,
(in thousands of euros)202120202019
Net loss(47,003)(33,590)(50,915)
Effective tax expense
Recurring loss before tax(47,058)(33,581)(50,912)
Theoretical tax rate (statutory rate in France)26.50 %28.00 %31.00 %
Theoretical tax (benefit) expense(12,470)(9,403)(15,782)
Share-based payment848 819 1,339 
Other temporary differences117 (6)(1)
Other non-taxable items (644)(540)(736)
Unrecognized tax losses12,154 9,138 15,177 
Effective tax expense5 9 3 
Effective tax rate0.00 %0.00 %0.00 %