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Employee benefits - Summary of Defined Benefit Obligation and Plan Assets (Details) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of net defined benefit liability (asset)    
Defined benefit obligations as of January 1, € 10,412  
Defined benefit obligation as of December 31, 14,129 € 10,412
Changes in fair value measurement, assets [abstract]    
Fair value of plan assets as of January 1, 10,215  
Fair value of plan assets as of December 31, 13,086 10,215
Present value of defined benefit obligation    
Disclosure of net defined benefit liability (asset)    
Defined benefit obligations as of January 1, 10,412 11,456
Interest expense on defined benefit obligation 280 44
Current service cost 558 726
Contributions by plan participants 490 369
Benefits (paid) / deposited 904 56
Administration cost (excl. cost for managing plan assets) 6 6
Actuarial loss (gain) on defined benefit obligation 967 (2,855)
Exchange rate loss 512 610
Defined benefit obligation as of December 31, 14,129 10,412
Changes in fair value measurement, assets [abstract]    
Interest income on plan assets 280 44
Contributions by plan participants 490 369
Benefits deposited (paid) 904 56
Exchange rate loss 512 610
Plan assets    
Disclosure of net defined benefit liability (asset)    
Interest expense on defined benefit obligation 275 31
Contributions by the employer 628 452
Contributions by plan participants 490 369
Benefits (paid) / deposited 909 (53)
Exchange rate loss 509 522
Others   204
Return on plan assets excl. interest income (182) (596)
Adjustment to asset ceiling 242 (79)
Changes in fair value measurement, assets [abstract]    
Fair value of plan assets as of January 1, 10,215 9,365
Interest income on plan assets 275 31
Contributions by the employer 628 452
Contributions by plan participants 490 369
Benefits deposited (paid) 909 (53)
Others   204
Return on plan assets excl. interest income (182) (596)
Exchange rate loss 509 522
Adjustment to asset ceiling 242 (79)
Fair value of plan assets as of December 31, € 13,086 € 10,215