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Share-Based Payments - Additional Information (Details)
€ / shares in Units, $ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended 24 Months Ended 36 Months Ended
Nov. 16, 2021
Jul. 22, 2021
USD ($)
$ / shares
shares
Sep. 30, 2021
shares
Dec. 31, 2019
shares
Dec. 31, 2023
EUR (€)
shares
Option
item
instrument
Dec. 31, 2023
Option
shares
$ / shares
Dec. 31, 2022
EUR (€)
shares
Option
instrument
€ / shares
Dec. 31, 2021
EUR (€)
Option
shares
instrument
€ / shares
Dec. 31, 2021
Option
shares
$ / shares
Dec. 31, 2023
instrument
Option
shares
Dec. 31, 2023
EUR (€)
Option
shares
Dec. 31, 2024
Oct. 01, 2023
EUR (€)
shares
Nov. 06, 2021
$ / shares
Jan. 01, 2021
Option
Dec. 31, 2020
shares
Share-based payments                                
Share-based compensation expense | €         € (39,712,000)   € (28,637,000) € (15,431,000)                
License agreement term   10 years                            
Expected dividend as percentage, share options granted         0.00%     0.00%                
Exercisable shares | shares         2,076,704 2,076,704 1,845,959     2,076,704 2,076,704          
2021 Plan                                
Share-based payments                                
Share based arrangement unrecognized compensation cost period         3 years 4 months 24 days     4 years                
2021 Plan | Vesting period for certain cases                                
Share-based payments                                
Share based arrangement unrecognized compensation cost period         1 year                      
Management Participation Plan                                
Share-based payments                                
Granted (Number of shares) | instrument             0                  
Share-based compensation expense | €         € 200,000   € 300,000 € 5,600,000                
Granted (Number of options) | Option               7,501                
Substantially equal installments                       65.00%        
Number of share options forfeited in share-based payment arrangement | Option               3,589                
Number of share options outstanding in share-based payment arrangement | Option         298,994 298,994       298,994 298,994       295,082  
Share based compensation payment number of share converted | shares     9,566,464                          
Granted (Weighted average exercise price) | € / shares             € 108.66                  
Fair value at grant date | €             € 759,840                  
Management Participation Plan | Class A Ordinary Shares                                
Share-based payments                                
Shares vested immediately upon the consummation of the Company's initial public offering               35.00%                
Personnel expenses | 2021 Plan                                
Share-based payments                                
Share-based compensation expense | €         € 38,100,000   22,500,000 € 1,100,000                
Operating expenses | 2021 Plan                                
Share-based payments                                
Share-based compensation expense | €         € 1,000,000.0   € 900,000 € 200,000                
Reorganization Transactions [Member] | Phantom Option Plan                                
Share-based payments                                
Conversion of awards, Converted restricted stock units | shares       66,744                        
Stock Options | 2021 Plan                                
Share-based payments                                
Granted (Number of options) | Option         3,500,000     33,513                
Number of share options forfeited in share-based payment arrangement | Option         33,513                      
Number of share options outstanding in share-based payment arrangement | Option         3,500,000 3,500,000 33,513 33,513 33,513 3,500,000 3,500,000          
Granted (Weighted average exercise price) | $ / shares           $ 12.90     $ 27.00              
Stock Options | Phantom Option Plan                                
Share-based payments                                
Granted (Number of options) | shares               68                
Number of share options forfeited in share-based payment arrangement | shares               79                
Number of share options outstanding in share-based payment arrangement | shares                               3,475
Granted (Weighted average exercise price) | € / shares               € 4,081.36                
Restricted Share Units | 2021 Plan                                
Share-based payments                                
Share based arrangement unrecognized compensation cost period         2 years 9 months 18 days   3 years 1 month 6 days                  
Granted (Number of shares) | instrument         5,162,678   3,159,725 1,302,599                
Warrants exercised | instrument         1,400,697   373,739                  
Restricted Share Units | Phantom Option Plan                                
Share-based payments                                
Granted (Number of shares) | instrument                   0            
Share-based compensation expense | €         € 200,000   € 700,000 € 1,700,000                
Warrants exercised | shares         233,579   269,131 350,174                
Restricted Share Units | Management Participation Plan                                
Share-based payments                                
Warrants exercised | shares         1,905,966   1,962,796                  
Option To Acquire Class A Shares                                
Share-based payments                                
Class of warrant or right number of shares called by warrants or rights | shares   1,116,540                     9,229,797      
Class of warrant or right exercise price of warrants or rights | $ / shares   $ 8.96                            
Additional offering | $   $ 30.0                            
NHL Warrants                                
Share-based payments                                
Class of warrant or right subscription price of warrants or rights | $ / shares   $ 23.45                            
Class of warrant or right number of shares called by warrants or rights | shares   1,353,740                            
Adjustment to paid in capital fair value of equity instruments granted | €                     € 28,000,000.0          
Amortization expense | €         € 3,100,000   € 3,600,000 € 800,000                
NBA Warrants                                
Share-based payments                                
Partnership agreement term 8 years                              
Percentage of entity outstanding Class A ordinary shares exercisable on vesting of warrants                           3.00%    
Percentage of warrants vesting on date of agreement               20.00% 20.00%         20.00%    
Percentage of warrants vesting on license approval date                         100.00%      
Warrants measured at fair value recorded as intangible asset | €                         € 87,300,000      
Additional paid in capital | €         52,000,000.0                      
Class of warrant or right exercise price of warrants or rights | $ / shares                           $ 0.01    
Amortization expense | €         € 3,600,000                      
Exercisable shares | shares         230,745 230,745   1,845,959 1,845,959 230,745 230,745          
Vesting term of warrants 8 years                              
Warrants exercised | item         0