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Share-based payments - Valuation of Options (Details)
€ / shares in Units, € in Thousands
12 Months Ended
Dec. 31, 2020
$ / shares
Dec. 31, 2020
EUR (€)
Y
Dec. 31, 2019
EUR (€)
Y
€ / shares
Dec. 31, 2018
EUR (€)
Options        
Key assumptions used to derive other equity instruments value        
Exercise price (USD) | $ / shares $ 11.60      
Share price at grant date (USD) | $ / shares 11.05      
Volatility (%)   75.00%    
Risk‑free interest rate (%)   0.80%    
Dividend yield (%)   0.00%    
Expected contractual life (years) | Y   10    
Weighted average fair value (USD) | $ / shares 6.20      
Performance Based RSUs        
Key assumptions used to derive other equity instruments value        
Share price at grant date (USD) | $ / shares 12.54      
Volatility (%)   88.00%    
Dividend yield (%)   0.00%    
Weighted average fair value (USD) | $ / shares 8.23      
Performance Based RSUs | Minimum        
Key assumptions used to derive other equity instruments value        
Risk‑free interest rate (%)   0.20%    
Expected contractual life (years) | Y   12.08    
Performance Based RSUs | Maximum        
Key assumptions used to derive other equity instruments value        
Risk‑free interest rate (%)   0.30%    
Expected contractual life (years) | Y   13.08    
Virtual share option program 2017 (Cash settled)        
Expenses arising from share-based payment transactions        
Expenses arising from cash-settled share-based payment transactions | €     € 5,118 € 4,079
Virtual share option program 2016 (Cash settled)        
Expenses arising from share-based payment transactions        
Expenses offset by replacement equity-settled share-based payment transactions | €     596 1,442
Equity share option 2017 and 2019        
Expenses arising from share-based payment transactions        
Expenses arising from cash-settled share-based payment transactions | €     5,714 5,521
Expenses arising from equity-settled share-based payment transactions | €   € 5,658 704  
Total expenses arising from share-based payment transactions | €   5,658 € 6,418 € 5,521
Equity share option 2017 (Equity settled)        
Key assumptions used to derive the option value        
Exercise price | € / shares     € 0.12  
Share price at grant date | € / shares     € 12.58  
Volatility (%)     70.00%  
Risk-free interest rate (%)     (0.70%)  
Dividend yield (%)     0.00%  
Option term (years) | Y     10  
Equity share option 2019 (Equity settled)        
Key assumptions used to derive the option value        
Exercise price | € / shares     € 12.58  
Share price at grant date | € / shares     € 12.58  
Volatility (%)     70.00%  
Risk-free interest rate (%)     (0.70%)  
Dividend yield (%)     0.00%  
Option term (years) | Y     10  
Expenses arising from share-based payment transactions        
Expenses arising from equity-settled share-based payment transactions | €   € 2,105 € 704  
2019 Plan        
Key assumptions used to derive other equity instruments value        
Exercise price (USD) | $ / shares 14.00      
Share price at grant date (USD) | $ / shares 12.02      
Volatility (%)   75.00%    
Risk‑free interest rate (%)   1.00%    
Dividend yield (%)   0.00%    
Expected contractual life (years) | Y   8.9    
Weighted average fair value (USD) | $ / shares 12.02      
2019 Plan | Management board and employees        
Expenses arising from share-based payment transactions        
Expenses arising from equity-settled share-based payment transactions | €   € 3,217    
2019 Plan | New CEO        
Expenses arising from share-based payment transactions        
Expenses arising from equity-settled share-based payment transactions | €   269    
2019 Plan | Supervisory board members        
Expenses arising from share-based payment transactions        
Expenses arising from equity-settled share-based payment transactions | €   € 67    
2019 Plan | RSUs        
Key assumptions used to derive other equity instruments value        
Weighted average fair value (USD) | $ / shares $ 11.62