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Equity - Common Shares (Details)
€ / shares in Units, € in Thousands
12 Months Ended
Jan. 31, 2022
EUR (€)
shares
Dec. 31, 2023
EUR (€)
€ / shares
shares
Dec. 31, 2022
EUR (€)
€ / shares
shares
Dec. 31, 2021
EUR (€)
€ / shares
shares
Jan. 31, 2022
$ / shares
Jan. 31, 2022
€ / shares
Dec. 31, 2020
shares
Disclosure of classes of share capital [line items]              
Number of common shares issued (in shares) 4,479,088            
Net offering proceeds, after deducting underwriting discounts, commissions and transaction costs | € € 15,000            
Share price | (per share)         $ 3.73 € 3.35  
Common shares              
Disclosure of classes of share capital [line items]              
Par value per share (in euros per share) | € / shares   € 0.12 € 0.12 € 0.12      
Increase (decrease) in number of ordinary shares issued     4,998,000        
Authorized but unissued share capital | €   € 6,000 € 6,713 € 6,772      
Number of shares issued and fully paid   29,000,137 27,595,835 22,567,971     22,118,000