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Share-based payment plans - Additional information (Details)
1 Months Ended 12 Months Ended
Mar. 31, 2025
Option
€ / shares
Nov. 30, 2023
Option
€ / shares
Oct. 31, 2023
Option
€ / shares
May 31, 2018
shares
€ / shares
Jul. 31, 2016
shares
€ / shares
Jul. 31, 2015
Option
Nov. 30, 2014
Option
€ / shares
Jul. 31, 2014
Option
Dec. 31, 2025
Option
shares
Dec. 31, 2024
Option
Dec. 31, 2023
Option
Share-based payment plans                      
Number of shares for each warrant                 1    
IPO plan                      
Share-based payment plans                      
Number of shares for each warrant                 1    
Term                 P10Y    
Contractual term                 10 years    
vesting% first period                 25.00%    
vesting% second period                 25.00%    
vesting% fourth period                 25.00%    
Granted | Option           18,180 36,151 979,898      
vesting% third period                 25.00%    
Exercise price, share options granted | € / shares             € 8.81        
Forfeited | Option                   47,524 4,257
2015 Warrant Plan                      
Share-based payment plans                      
Number of shares for each warrant                 1    
Term                 P10Y    
vesting% second period                 10.00%    
vesting% fourth period                 30.00%    
vesting% fifth period                 40.00%    
Granted       2,000 350,000            
vesting% third period                 20.00%    
Exercise price, share options granted | € / shares       € 10.08 € 6.45            
Maximum number of warrants                 1,400,000    
Forfeited | Option                 12,600 2,000  
Exercised | Option                 0    
2023 Warrant Plan                      
Share-based payment plans                      
Number of shares for each warrant                 1    
Term                 P7Y    
vesting% second period                 10.00%    
vesting% fourth period                 30.00%    
vesting% fifth period                 40.00%    
Granted | Option 25,000 25,000 325,000           25,000   350,000
vesting% third period                 20.00%    
Exercise price, share options granted | € / shares € 7.59 € 5.09 € 4.87                
Maximum number of warrants                 500,000    
Forfeited | Option                 25,000