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Share-based payments - Equity share option 2019 (Equity settled) (Details) - Equity share option 2019 (Equity settled) - Member of the supervisory board
€ / shares in Units, € in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
EUR (€)
Mar. 31, 2019
EUR (€)
Dec. 31, 2019
Options
€ / shares
shares
Share-based payments      
Number of options granted | Options     396,522
Number of common shares per option granted | shares     1
Exercise price of share options     € 12.58
Vesting period     3 years
Vesting percentage     33.33%
Weighted average remaining contractual life of outstanding share options     10 years
Weighted average fair value of options outstanding     € 9.08
Share-based payment expense | € € 1,057 € 2,633