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Share-based payments - New VSOP - Expense recognized in the statement of operations and other comprehensive income (loss) (Details) - New VSOP
$ / shares in Units, € in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2023
EUR (€)
Option
Dec. 31, 2023
$ / shares
Dec. 31, 2022
EUR (€)
shares
Dec. 31, 2022
USD ($)
EUR (€)
$ / shares
Dec. 31, 2021
EUR (€)
shares
Dec. 31, 2021
USD ($)
EUR (€)
$ / shares
Dec. 31, 2020
USD ($)
Share-based payments              
Number of awards exercisable       59,942   88,464  
Number of options exercised 69,246   147,620   557,171    
Average share price | $ / shares   $ 9.90   $ 16.81   $ 61.28  
Employer taxes payable | $       $ 45   $ 51 $ 493
Provision for employer taxes | $             $ 981
Research and development expenses € (31)   € 69   € (349)    
Selling and distribution expenses     23   (188)    
General and administrative expenses 12   3   (35)    
Total € (19)   € 95   € (572)    
Exercise of options              
Share-based payments              
Number of options exercised | shares     147,620