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Investment in financial asset and gain on disposal of associate (Details) - EUR (€)
€ in Thousands
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jan. 31, 2021
Disclosure of Investment in Financial Asset and Gain on Disposal of Associate [Line items]      
Gain (loss) on disposal of associate   € 514  
Wings Therapeutics Inc      
Disclosure of Investment in Financial Asset and Gain on Disposal of Associate [Line items]      
Gain (loss) on disposal of associate   (107)  
Phoenicis Therapeutics Inc.      
Disclosure of Investment in Financial Asset and Gain on Disposal of Associate [Line items]      
Proportion of ownership interest     3.90%
Gain (loss) on disposal of associate   € 621  
Changes in fair value of investment € 0