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Shareholders' Equity - Bonus share award plans (Details)
12 Months Ended
Dec. 08, 2022
EUR (€)
shares
Dec. 08, 2021
EUR (€)
shares
Apr. 16, 2021
EUR (€)
shares
Dec. 31, 2022
Dec. 31, 2021
Jan. 01, 2022
plan
Bonus Share Award Plans [Member]            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Number of free share award plans | plan           2
Issued       373,000 589,000  
AGA 2021 [Member]            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Vesting period     3 years      
Issued   123,000 466,000      
Number of shares per AGA | shares     1      
Expected volatility     64.00%      
Average life (years)     3 years      
Risk-free rate     0.60%      
AGA 2021 [Member] | Bottom of range [member]            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Fair value per AGA at grant date (€)     € 9.8      
AGA 2021 [Member] | Top Of range            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Fair value per AGA at grant date (€)     € 11.3      
AGA 2021-1            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Issued         466,000  
AGA 2021-bis            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Vesting period   3 years        
Issued   123,000     123,000  
Number of shares per AGA | shares   1        
Expected volatility   64.00%        
Average life (years)   2 years 3 months 18 days        
Risk-free rate   0.60%        
AGA 2021-bis | Bottom of range [member]            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Fair value per AGA at grant date (€)   € 11.4        
AGA 2021-bis | Top Of range            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Fair value per AGA at grant date (€)   € 12.2        
AGA 2022            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Vesting period 1 year          
Holding period (year) 1 year          
Issued 373,000     373,000    
Number of shares per AGA | shares 1          
Fair value per AGA at grant date (€) € 4.18