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Company Information - Bonus share award plans ("AGA") (Details)
12 Months Ended
Dec. 08, 2022
employee
Jun. 28, 2021
EUR (€)
€ / shares
Dec. 14, 2020
EUR (€)
EquityInstruments
€ / shares
Jun. 28, 2020
EUR (€)
EquityInstruments
€ / shares
Jan. 26, 2020
EUR (€)
EquityInstruments
€ / shares
Jun. 28, 2019
Dec. 14, 2018
Jan. 26, 2018
Dec. 31, 2022
EUR (€)
€ / shares
Dec. 31, 2021
EUR (€)
Dec. 31, 2020
EUR (€)
Dec. 31, 2020
Dec. 31, 2020
EquityInstruments
Company Information                          
Capital increase arising from the vesting of bonus share awards | €                 € 2,218,000 € 2,089,000 € 938,000    
Par value per share | € / shares                 € 0.01        
AGA                          
Company Information                          
Number of employees for whom bonus shares were granted | employee 110                        
Number of bonus shares fully vested                       517,550 517,550
AGA 2019-1                          
Company Information                          
Number of bonus shares fully vested   29,100       29,100       29,100      
Capital increase arising from the vesting of bonus share awards | €   € 291,000                      
Par value per share | € / shares   € 0.01                      
AGA 2018-2                          
Company Information                          
Number of bonus shares fully vested         63,300     63,300       63,300  
Capital increase arising from the vesting of bonus share awards | €         € 633,000                
Par value per share | € / shares         € 0.01                
AGA 2019-2                          
Company Information                          
Number of bonus shares fully vested       227,000   227,000           227,000  
Capital increase arising from the vesting of bonus share awards | €       € 2,270,000                  
Par value per share | € / shares       € 0.01                  
AGA 2018-3                          
Company Information                          
Number of bonus shares fully vested     227,250       227,250         227,250  
Capital increase arising from the vesting of bonus share awards | €     € 2,272,500                    
Par value per share | € / shares     € 0.01