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Shareholders' Equity - Bonus share award plans (Details)
12 Months Ended
Dec. 08, 2021
Apr. 16, 2021
Apr. 18, 2019
Jan. 26, 2019
Dec. 31, 2021
EUR (€)
€ / shares
shares
Dec. 31, 2019
Bonus share award plans            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Issued         589,000 283,500
AGA 2017-1            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Issued     77,500      
AGA 2018-1            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Issued       10,000    
AGA 2019-1            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Vesting period         2 years  
Issued         37,500 37,500
Holding period (year)           1 year
Number of shares per AGA | shares         1  
Fair value per AGA at grant date ()         € 1.92  
Stock price reference | € / shares         € 2  
Non-transferable discount         3.80%  
AGA 2019-2            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Issued           246,000
AGA 2021            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Vesting period         3 years  
Issued 123,000 466,000     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 | 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 | Top of range [Member]            
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  
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 [Member]            
Disclosure of terms and conditions of share-based payment arrangement [line items]            
Fair value per AGA at grant date ()         € 12.2