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Employee Benefits - Additional Information (Detail)
1 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
shares
Jan. 31, 2023
shares
Dec. 31, 2022
€ / shares
Dec. 31, 2023
EUR (€)
shares
€ / shares
Dec. 31, 2022
EUR (€)
shares
€ / shares
Dec. 31, 2021
EUR (€)
shares
€ / shares
Jun. 30, 2023
€ / shares
Oct. 01, 2021
€ / shares
Employee Benefits [Line Items]                
Par value per share | € / shares     € 5.32 € 3.05 € 5.32   € 2.58  
Share-based payments | €       € 13,307,000 € 32,625,000 € 2,455,000    
Increase decrease through share based payment transactions, Equity | €       16,672,000 34,837,000 2,143,000    
Revenue | €       € 143,769,000 € 144,185,000 71,579,000    
Granted | shares       2,463,890 5,760,917      
Top of range [member]                
Employee Benefits [Line Items]                
Revenue | €       € 750,000,000        
Management Stock Option Plan [Member]                
Employee Benefits [Line Items]                
Share-based payments | €       € 2,915,000 € 14,377,000 € 2,382,000    
Exercise price of outstanding share options | € / shares     0.0021 € 0.0021 € 0.0021 € 0.0021    
Weighted average remaining contractual life of outstanding share options       2024 years        
Granted | shares       38,610 33,000 4,201,352    
Employee Stock Option Plan [Member]                
Employee Benefits [Line Items]                
Par value per share | € / shares       € 0.12   € 0.5    
Number of years from closing during which options will be available for execution in exchange for shares       10 years        
Share-based payments | €       € 73,000   € 73,000    
Exercise price of outstanding share options | € / shares       € 0.5        
Date of grant of share based payment arrangement       May 1, 2020        
Expense from cash settled share based payment transactions | €       € 73,000        
Increase decrease through share based payment transactions, Equity | €       239,000        
Payments for share based payment transactions | €       € 313,000        
Granted | shares   20,000   0 0 0    
Maximum discount granted to each employee to purchase shares   15.00%            
Employee Stock Option Plan [Member] | Bottom of range [member]                
Employee Benefits [Line Items]                
Ceiling limit on the purchase of shares on yearly salary per employee   1.00%            
Employee Stock Option Plan [Member] | Top of range [member]                
Employee Benefits [Line Items]                
Ceiling limit on the purchase of shares on yearly salary per employee   10.00%            
Founders Stock Option Plan [Member]                
Employee Benefits [Line Items]                
Share-based payments | €         € 8,195,000      
Exercise price of outstanding share options | € / shares     € 1.93 € 1.93 € 1.93      
Granted | shares       0 1,033,609      
Restricted Stock Units for Employees [Member]                
Employee Benefits [Line Items]                
Share-based payments | €       € 11,289,000 € 6,862,000      
Granted | shares       2,425,280 2,198,289      
Restricted Stock Units for Management [Member]                
Employee Benefits [Line Items]                
Share-based payments | €       € 1,508,000 € 3,103,000      
Granted | shares       0 2,000,000      
Restricted Stock Units for Management [Member] | Bottom of range [member]                
Employee Benefits [Line Items]                
Weighted average remaining contractual life of outstanding share options       2024 years        
Restricted Stock Units for Management [Member] | Top of range [member]                
Employee Benefits [Line Items]                
Weighted average remaining contractual life of outstanding share options       2029 years        
Two Thousand and Twenty One Management Stock Option Plan [Member] | Management Stock Option Plan [Member]                
Employee Benefits [Line Items]                
Par value per share | € / shares       € 0.12       € 0.5
Number of years from closing during which options will be available for execution in exchange for shares       10 years        
Two Thousand and Twenty One Management Stock Option Plan [Member] | Employee Stock Option Plan [Member]                
Employee Benefits [Line Items]                
Number of share options settled in share based payment arrangement | shares       1,254        
Two Thousand and Twenty One Management Stock Option Plan [Member] | Based on Exchange Ratio [Member] | Management Stock Option Plan [Member]                
Employee Benefits [Line Items]                
Number of options called by each outstanding options | shares       240.990795184659        
Two Thousand and Twenty Two Management Stock Option Plan [Member] | Management Stock Option Plan [Member]                
Employee Benefits [Line Items]                
Par value per share | € / shares       € 0.0021        
Legacy Stock Option Program [Member] | Founders Stock Option Plan [Member]                
Employee Benefits [Line Items]                
Par value per share | € / shares       0.12   € 0.5    
Exercise price of outstanding share options | € / shares       € 466.24        
Maximum number of shares that shall underlie all of the options under the plan | shares 4,289              
Exchange Ratio       240.990795184659        
Weighted average remaining contractual life of outstanding share options       5 years        
Weighted average share price | € / shares       € 8.66        
Legacy Stock Option Program [Member] | After Applying the Exchange Ratio [Member] | Founders Stock Option Plan [Member]                
Employee Benefits [Line Items]                
Exercise price of outstanding share options | € / shares       € 1.93        
Maximum number of shares that shall underlie all of the options under the plan | shares 1,033,610              
Incentive Award Plan [Member] | Restricted Stock Units for Employees [Member]                
Employee Benefits [Line Items]                
Percentage of vesting of award under share-based payment arrangement     100.00%          
Incentive Award Plan [Member] | Restricted Stock Units for Employees [Member] | First Anniversary Date [Member]                
Employee Benefits [Line Items]                
Percentage of vesting of award under share-based payment arrangement       33.00%        
Incentive Award Plan [Member] | Restricted Stock Units for Employees [Member] | Second Anniversary Date [Member]                
Employee Benefits [Line Items]                
Percentage of vesting of award under share-based payment arrangement       33.00%        
Incentive Award Plan [Member] | Restricted Stock Units for Employees [Member] | Third Anniversary Date [Member]                
Employee Benefits [Line Items]                
Percentage of vesting of award under share-based payment arrangement       34.00%        
Incentive Award Plan [Member] | Restricted Stock Units for Management [Member] | Time Based Vesting Stock Options [Member]                
Employee Benefits [Line Items]                
Percentage of vesting of award under share-based payment arrangement       33.00%        
Incentive Award Plan [Member] | Restricted Stock Units for Management [Member] | Performance Based Vesting Stock Options [Member] | Period 1 [Member]                
Employee Benefits [Line Items]                
Number of trading days for determining the share price       20 days        
Number of consecutive trading days for determining the share price       30 days        
Incentive Award Plan [Member] | Restricted Stock Units for Management [Member] | Performance Based Vesting Stock Options [Member] | Period 1 [Member] | Accelerator Event [Member]                
Employee Benefits [Line Items]                
Weighted average share price | € / shares       € 25        
Number of trading days for determining the share price       20 days        
Number of consecutive trading days for determining the share price       30 days        
Revenue | €       € 1,000,000,000        
Incentive Award Plan [Member] | Restricted Stock Units for Management [Member] | Performance Based Vesting Stock Options [Member] | Period 2 [Member]                
Employee Benefits [Line Items]                
Weighted average share price | € / shares       € 30        
Number of trading days for determining the share price       20 days        
Number of consecutive trading days for determining the share price       30 days        
Incentive Award Plan [Member] | Restricted Stock Units for Management [Member] | Performance Based Vesting Stock Options [Member] | Bottom of range [member] | Period 1 [Member]                
Employee Benefits [Line Items]                
Percentage of vesting of award under share-based payment arrangement       50.00%        
Incentive Award Plan [Member] | Restricted Stock Units for Management [Member] | Performance Based Vesting Stock Options [Member] | Bottom of range [member] | Period 2 [Member]                
Employee Benefits [Line Items]                
Percentage of vesting of award under share-based payment arrangement       50.00%        
Incentive Award Plan [Member] | Restricted Stock Units for Management [Member] | First Anniversary Date [Member] | Time Based Vesting Stock Options [Member] | Bottom of range [member]                
Employee Benefits [Line Items]                
Percentage of vesting of award under share-based payment arrangement       50.00%        
Incentive Award Plan [Member] | Restricted Stock Units for Management [Member] | Second Anniversary Date [Member] | Time Based Vesting Stock Options [Member] | Bottom of range [member]                
Employee Benefits [Line Items]                
Percentage of vesting of award under share-based payment arrangement       50.00%