| Summary of Employee Benefits Expense | Employee benefits expense are detailed as follows:   
       
        |  |  |  |  |  |  |  |  |  |  |  |  |  |  
        |   |   | For the year ended December 31, |   |  
        |   |   | 2022 |   |   | 2021 |   |   | 2020 |   |  
        |   |   | (EUR thousand) |   |  
        | Included in Cost of sales: |   |   |   |   |   |   |   |   |   |  
        | Wages and salaries |   |   | 154,852 |   |   |   | 134,619 |   |   |   | 123,773 |   |  
        | Social security costs |   |   | 30,721 |   |   |   | 25,610 |   |   |   | 22,720 |   |  
        | Pension costs |   |   | 5,970 |   |   |   | 4,917 |   |   |   | 4,260 |   |  
        | Share-based payment expense |   |   | 287 |   |   |   | — |   |   |   | — |   |  
        | Included in Selling and Marketing expenses: |   |   |   |   |   |   |   |   |   |  
        | Wages and salaries |   |   | 13,978 |   |   |   | 12,716 |   |   |   | 11,522 |   |  
        | Social security costs |   |   | 1,606 |   |   |   | 1,531 |   |   |   | 1,278 |   |  
        | Pension costs |   |   | 433 |   |   |   | 403 |   |   |   | 363 |   |  
        | Share-based payment expense |   |   | 1,024 |   |   |   | — |   |   |   | — |   |  
        | Included in General and Administrative expenses: |   |   |   |   |   |   |   |   |   |  
        | Wages and salaries |   |   | 22,272 |   |   |   | 26,106 |   |   |   | 17,313 |   |  
        | Social security costs |   |   | 3,612 |   |   |   | 3,589 |   |   |   | 2,900 |   |  
        | Pension costs |   |   | 510 |   |   |   | 545 |   |   |   | 545 |   |  
        | Cash settled awards |   |   | — |   |   |   | (10,831 | ) |   |   | 2,394 |   |  
        | Share-based payment expense |   |   | 5,991 |   |   |   | 1,740 |   |   |   | — |   |  
        | Included in Research and Development expenses: |   |   |   |   |   |   |   |   |   |  
        | Wages and salaries |   |   | 12,463 |   |   |   | 9,089 |   |   |   | 6,327 |   |  
        | Social security costs |   |   | 1,496 |   |   |   | 1,270 |   |   |   | 857 |   |  
        | Pension costs |   |   | 358 |   |   |   | 331 |   |   |   | 232 |   |  
        | Share-based payment expense |   |   | 800 |   |   |   | — |   |   |   | — |   |  
        | Total employee benefits expense |   |   | 256,373 |   |   |   | 211,635 |   |   |   | 194,484 |   |  | 
| Summary of Average Size of Group's Workforce | The average size of the Group's workforce during the year is as follows:   
       
        |  |  |  |  |  |  |  |  |  |  |  |  |  |  
        |   |   | For the year ended December 31, |   |  
        |   |   | 2022 |   |   | 2021 |   |   | 2020 |   |  
        | Executives |   |   | 57 |   |   |   | 51 |   |   |   | 42 |   |  
        | Managers |   |   | 137 |   |   |   | 126 |   |   |   | 113 |   |  
        | Employees |   |   | 4,781 |   |   |   | 4,284 |   |   |   | 3,889 |   |  
        | Total Workforce |   |   | 4,975 |   |   |   | 4,461 |   |   |   | 4,044 |   |    |