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Share-Based Payments - Summary of Phantom option plan (Details)
12 Months Ended
Dec. 31, 2023
shares
€ / shares
Dec. 31, 2022
shares
instrument
$ / shares
Dec. 31, 2022
shares
instrument
€ / shares
Dec. 31, 2021
shares
instrument
€ / shares
$ / shares
Dec. 31, 2021
shares
instrument
€ / shares
Dec. 31, 2020
shares
€ / shares
Share-based payments            
Unvested restricted shares, beginning balance (Number of shares) | instrument   1,353,740 1,353,740      
Unvested restricted shares, ending balance (Number of shares) | instrument       1,353,740 1,353,740  
Unvested restricted shares beginning balance (Weighted average grant date Fair Value per share) | $ / shares   $ 23.45        
Unvested restricted shares, ending balance (Weighted average grant date Fair Value per share) | $ / shares       $ 23.45    
Stock Options | Phantom Option Plan            
Share-based payments            
Outstanding options (Number of shares) | shares           3,475
Granted (Number of shares) | shares       68 68  
Cancelled/forfeited (Number of shares) | shares       (79) (79)  
Outstanding options (Weighted average grant date Fair value per option/share) | € / shares           € 1,352.74
Granted (Weighted average exercise price) | € / shares         € 4,081.36  
Forfeited before IPO-date (Weighted average grant date Fair value per option/share) | € / shares         € 1,352.74  
Restricted Share Units | Phantom Option Plan            
Share-based payments            
Conversion to restricted share units (Number of shares) | shares       1,199,364 1,199,364  
Forfeited after the IPO date (Number of shares) | shares (61,268) (45,302) (45,302) (13,706) (13,706)  
Vested (Number of shares) | shares (233,579) (269,131) (269,131) (350,174) (350,174)  
Unvested restricted shares, beginning balance (Number of shares) | shares 521,051 835,484 835,484      
Forfeited (Number of shares) | shares (61,268) (45,302) (45,302) (13,706) (13,706)  
Unvested restricted shares, ending balance (Number of shares) | shares 226,204 521,051 521,051 835,484 835,484  
Unvested restricted shares beginning balance (Weighted average grant date Fair Value per share) | € / shares € 3.91   € 3.91      
Conversion to restricted share units (Weighted average grant date Fair value per option/share) | € / shares       $ 3.91 € 3.91  
Forfeited after the IPO date (Weighted average grant date Fair value per option/share) | € / shares 3.91   3.91   3.91  
Vested (Weighted average grant date Fair value per option/share) | € / shares 3.91   3.91   3.91  
Forfeited (Weighted average grant date Fair Value per share) | € / shares 3.91   3.91   3.91  
Unvested restricted shares, ending balance (Weighted average grant date Fair Value per share) | € / shares € 3.91   € 3.91   € 3.91