v3.26.1
Share capital and share based payments - Disclosure of Closing Balance of Share-Based Payment Arrangements (Details)
12 Months Ended
Jul. 25, 2025
EUR (€)
shares
€ / shares
Nov. 13, 2024
EUR (€)
shares
€ / shares
shares
Aug. 01, 2024
EUR (€)
shares
€ / shares
shares
Jun. 10, 2024
EUR (€)
shares
€ / shares
shares
Feb. 15, 2024
EUR (€)
shares
€ / shares
shares
Dec. 21, 2023
EUR (€)
shares
€ / shares
Dec. 16, 2022
EUR (€)
shares
€ / shares
Dec. 12, 2022
EUR (€)
shares
€ / shares
Oct. 03, 2022
EUR (€)
shares
€ / shares
Oct. 01, 2021
EUR (€)
shares
€ / shares
Jul. 22, 2021
EUR (€)
shares
€ / shares
Aug. 05, 2020
EUR (€)
shares
€ / shares
Apr. 29, 2019
EUR (€)
shares
€ / shares
Sep. 20, 2017
EUR (€)
shares
€ / shares
Oct. 21, 2016
EUR (€)
shares
€ / shares
Jul. 01, 2015
EUR (€)
shares
€ / shares
Apr. 27, 2015
EUR (€)
shares
€ / shares
Jul. 16, 2014
EUR (€)
shares
€ / shares
Jul. 17, 2013
EUR (€)
shares
€ / shares
Dec. 31, 2025
shares
Dec. 31, 2024
shares
Dec. 31, 2023
shares
Dec. 31, 2022
shares
AGA                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       3,701,358 6,559,158 5,203,063 4,677,173
Number of free shares granted (in shares)                                       220,500 2,952,204 2,341,793  
AGAP Management 2016-1                                               
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       1,200 1,200 1,200  
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                       156,000 156,000 156,000  
Vesting period (years)                             1 year                
Number of free shares granted (in shares)                             2,000         2,000 2,000 2,000  
Share entitlement per free share (in shares)                             130                
Grant date share fair value (in EUR per share) | € / shares                             € 10.87                
Expected volatility                             40.00%                
Expected dividends | €                             € 0                
Fair value per BSA (in EUR per share) | € / shares                             € 911                
AGAP Employees 2016-1                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       1,878 2,048 2,063  
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                       244,140 266,240 268,190  
Vesting period (years)                             1 year                
Number of free shares granted (in shares)                             2,486         2,486 2,486 2,486  
Share entitlement per free share (in shares)                             130                
Grant date share fair value (in EUR per share) | € / shares                             € 10.87                
Expected volatility                             40.00%                
Expected dividends | €                             € 0                
Fair value per BSA (in EUR per share) | € / shares                             € 911                
AGAP 2016-2                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                         3,000 3,000  
AGA New Members 2017-1                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       0 0 0  
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                       0 0 0  
Vesting period (years)                         3 years                    
Number of free shares granted (in shares)                         25,000             25,000 25,000 25,000  
Share entitlement per free share (in shares)                         1                    
Grant date share fair value (in EUR per share) | € / shares                         € 5.74                    
Expected volatility                         0.00%                    
Expected dividends | €                         € 0                    
Fair value per BSA (in EUR per share) | € / shares                         € 5.74                    
AGA Perf Employees 2019-1                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       0 0 0  
AGA Perf Management 2019-1                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       0 0 0  
AGA Bonus 2020-1                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       0 0 0  
AGA Perf Employees 2020-1                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       0 0 0  
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                       0 0 0  
Vesting period (years)                       3 years 6 months                      
Number of free shares granted (in shares)                       769,202               766,650 766,650 766,650  
Share entitlement per free share (in shares)                       1                      
Grant date share fair value (in EUR per share) | € / shares                       € 2.94                      
Expected volatility                       45.00%                      
Expected dividends | €                       € 0                      
Fair value per BSA (in EUR per share) | € / shares                       € 2.94                      
AGA Perf Management 2020-1                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       0 0 0  
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                       0 0 0  
Vesting period (years)                       3 years 6 months                      
Number of free shares granted (in shares)                       710,000               710,000 710,000 710,000  
Share entitlement per free share (in shares)                       1                      
Grant date share fair value (in EUR per share) | € / shares                       € 2.94                      
Expected volatility                       45.00%                      
Expected dividends | €                       € 0                      
Fair value per BSA (in EUR per share) | € / shares                       € 2.94                      
AGA Bonus 2021-1                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       0 0 0  
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                       0 0 0  
Vesting period (years)                     1 year                        
Number of free shares granted (in shares)                     125,748                 125,748 125,748 125,748  
Share entitlement per free share (in shares)                     1                        
Grant date share fair value (in EUR per share) | € / shares                     € 3.43                        
Expected volatility                     0.00%                        
Expected dividends | €                     € 0                        
Fair value per BSA (in EUR per share) | € / shares                     € 3.43                        
AGA Perf Employees 2021-1                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       0 0 819,300  
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                       0 0 819,300  
Vesting period (years)                   3 years 6 months                          
Number of free shares granted (in shares)                   1,066,600                   1,066,600 1,066,600 1,066,600  
Share entitlement per free share (in shares)                   1                          
Grant date share fair value (in EUR per share) | € / shares                   € 1.76                          
Expected volatility                   50.00%                          
Expected dividends | €                   € 0                          
Fair value per BSA (in EUR per share) | € / shares                   € 1.76                          
AGA Perf Management 2021-1                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       0 0 480,000  
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                       0 0 480,000  
Vesting period (years)                   3 years 6 months                          
Number of free shares granted (in shares)                   610,000                   610,000 610,000 610,000  
Share entitlement per free share (in shares)                   1                          
Grant date share fair value (in EUR per share) | € / shares                   € 1.76                          
Expected volatility                   50.00%                          
Expected dividends | €                   € 0                          
Fair value per BSA (in EUR per share) | € / shares                   € 1.76                          
AGA Bonus 2022-1 [Member]                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       0 0 0  
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                       0 0 0  
Vesting period (years)                 1 year                            
Number of free shares granted (in shares)                 128,061                     128,061 128,061 128,061  
Share entitlement per free share (in shares)                 1                            
Grant date share fair value (in EUR per share) | € / shares                 € 3.89                            
Expected volatility                 0.00%                            
Expected dividends | €                 € 0                            
Fair value per BSA (in EUR per share) | € / shares                 € 3.89                            
AGA Perf Employees 2022-1                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       0 1,072,500 1,173,500  
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                       0 1,072,500 1,173,500  
Vesting period (years)               3 years 1 month 6 days                              
Number of free shares granted (in shares)               1,371,500                       1,371,500 1,371,500 1,371,500  
Share entitlement per free share (in shares)               1                              
Grant date share fair value (in EUR per share) | € / shares               € 1.39                              
Expected volatility               50.00%                              
Expected dividends | €               € 0                              
Fair value per BSA (in EUR per share) | € / shares               € 1.39                              
AGA Perf Management 2022-1                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       0 550,000 550,000  
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                       0 550,000 550,000  
Vesting period (years)               3 years 1 month 6 days                              
Number of free shares granted (in shares)               550,000                       550,000 550,000 550,000  
Share entitlement per free share (in shares)               1                              
Grant date share fair value (in EUR per share) | € / shares               € 1.39                              
Expected volatility               50.00%                              
Expected dividends | €               € 0                              
Fair value per BSA (in EUR per share) | € / shares               € 1.39                              
AGA New Members 2023-1                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       25,000 25,000 25,000  
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                       25,000 25,000 25,000  
Number of free shares granted (in shares)                                       25,000 25,000 25,000  
AGA Perf Employees 2023-1                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       895,000 1,273,750 1,399,000  
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                       895,000 1,273,750 1,399,000  
Vesting period (years)           3 years                                  
Number of free shares granted (in shares)           1,403,500                           1,403,500 1,403,500 1,403,500  
Share entitlement per free share (in shares)           1                                  
Grant date share fair value (in EUR per share) | € / shares           € 1.60                                  
Expected volatility           50.00%                                  
Expected dividends | €           € 0                                  
Fair value per BSA (in EUR per share) | € / shares           € 1.60                                  
AGA Perf Management 2023-1                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       525,000 750,000 750,000  
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                       525,000 750,000 750,000  
Vesting period (years)           3 years                                  
Number of free shares granted (in shares)           750,000                           750,000 750,000 750,000  
Share entitlement per free share (in shares)           1                                  
Grant date share fair value (in EUR per share) | € / shares           € 1.60                                  
Expected volatility           50.00%                                  
Expected dividends | €           € 0                                  
Fair value per BSA (in EUR per share) | € / shares           € 1.60                                  
AGA New Members 2024-1                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       0 25,000 0  
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                       0 25,000    
Vesting period (years)         3 years                                    
Number of free shares granted (in shares)         25,000                             25,000 25,000    
Share entitlement per free share (in shares)         1                                    
Grant date share fair value (in EUR per share) | € / shares         € 2.31                                    
Expected volatility         0.00%                                    
Expected dividends | €         € 0                                    
Fair value per BSA (in EUR per share) | € / shares         € 2.31                                    
AGA "Plan Epargne Entreprise" 2024                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       0 0 0  
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                       0 0    
Number of free shares granted (in shares)       68,744                               68,744 68,744    
Share entitlement per free share (in shares)       1                                      
Grant date share fair value (in EUR per share) | € / shares       € 2.45                                      
Expected volatility       0.00%                                      
Expected dividends | €       € 0                                      
Fair value per BSA (in EUR per share) | € / shares       € 2.45                                      
AGA Perf Management 2024-1                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       150,000 150,000 0  
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                       150,000 150,000    
Vesting period (years)     2 years                                        
Number of free shares granted (in shares)     150,000                                 150,000 150,000    
Share entitlement per free share (in shares)     1                                        
Grant date share fair value (in EUR per share) | € / shares     € 2.01                                        
Expected volatility     0.00%                                        
Expected dividends | €     € 0                                        
Fair value per BSA (in EUR per share) | € / shares     € 2.01                                        
AGA employees 2024-1                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       277,080 368,760 0  
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                       277,080 368,760    
Vesting period (years)   3 years                                          
Number of free shares granted (in shares)   370,560                                   370,560 370,560    
Share entitlement per free share (in shares)   1                                          
Grant date share fair value (in EUR per share) | € / shares   € 1.62                                          
Expected volatility   0.00%                                          
Expected dividends | €   € 0                                          
Fair value per BSA (in EUR per share) | € / shares   € 1.62                                          
AGA Perf Employees 2024-1                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       858,900 1,162,900 0  
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                       858,900 1,162,900    
Vesting period (years)   3 years                                          
Number of free shares granted (in shares)   1,162,900                                   1,162,900 1,162,900    
Share entitlement per free share (in shares)   1                                          
Grant date share fair value (in EUR per share) | € / shares   € 1.87                                          
Expected volatility   50.00%                                          
Expected dividends | €   € 0                                          
Fair value per BSA (in EUR per share) | € / shares   € 1.87                                          
AGA Perf Management 2024-2                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       600,000 975,000 0  
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                       600,000 975,000    
Vesting period (years)   3 years                                          
Number of free shares granted (in shares)   975,000                                   975,000 975,000    
Share entitlement per free share (in shares)   1                                          
Grant date share fair value (in EUR per share) | € / shares   € 1.87                                          
Expected volatility   50.00%                                          
Expected dividends | €   € 0                                          
Fair value per BSA (in EUR per share) | € / shares   € 1.87                                          
AGA Management 2024-1                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       200,000 200,000 0  
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                       200,000 200,000    
Vesting period (years)   3 years                                          
Number of free shares granted (in shares)   200,000                                   200,000 200,000    
Share entitlement per free share (in shares)   1                                          
Grant date share fair value (in EUR per share) | € / shares   € 1.62                                          
Expected volatility   0.00%                                          
Expected dividends | €   € 0                                          
Fair value per BSA (in EUR per share) | € / shares   € 1.62                                          
AGA Employees 2025-1                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       164,300  
BSA                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       133,260 167,460 242,460 250,820
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                       133,260 167,460 242,460  
Number of free shares granted (in shares)                                       80,000 0 50,000  
BSA 2013                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       0 0 0  
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                       0 0 0  
Vesting period (years)                                     2 years        
Number of free shares granted (in shares)                                     237,500 237,500 237,500 237,500  
Share entitlement per free share (in shares)                                     1        
Exercise price (in EUR per share) | € / shares                                     € 2.36        
Grant date share fair value (in EUR per share) | € / shares                                     € 2.45        
Expected volatility                                     31.83%        
Average life of BSA                                     5 years 6 months        
Risk-free interest rate                                     2.42%        
Expected dividends | €                                     € 0        
Fair value per BSA (in EUR per share) | € / shares                                     € 0.87        
BSA 2014                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       0 0 75,000  
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                       0 0 75,000  
Vesting period (years)                                   2 years          
Number of free shares granted (in shares)                                   150,000   150,000 150,000 150,000  
Share entitlement per free share (in shares)                                   1          
Exercise price (in EUR per share) | € / shares                                   € 8.65          
Grant date share fair value (in EUR per share) | € / shares                                   € 6.85          
Expected volatility                                   46.72%          
Average life of BSA                                   5 years 6 months          
Risk-free interest rate                                   1.00%          
Expected dividends | €                                   € 0          
Fair value per BSA (in EUR per share) | € / shares                                   € 2.51          
BSA 2015-1                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       0 70,000 70,000  
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                       0 70,000 70,000  
Vesting period (years)                                 2 years            
Number of free shares granted (in shares)                                 70,000     70,000 70,000 70,000  
Share entitlement per free share (in shares)                                 1            
Exercise price (in EUR per share) | € / shares                                 € 9.59            
Grant date share fair value (in EUR per share) | € / shares                                 € 13.65            
Expected volatility                                 54.08%            
Average life of BSA                                 5 years 6 months            
Risk-free interest rate                                 0.25%            
Expected dividends | €                                 € 0            
Fair value per BSA (in EUR per share) | € / shares                                 € 6.59            
BSA 2015-2                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       0 14,200 14,200  
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                       0 14,200 14,200  
Vesting period (years)                               2 years              
Number of free shares granted (in shares)                               14,200       14,200 14,200 14,200  
Share entitlement per free share (in shares)                               1              
Exercise price (in EUR per share) | € / shares                               € 14.05              
Grant date share fair value (in EUR per share) | € / shares                               € 13.64              
Expected volatility                               47.83%              
Average life of BSA                               5 years 6 months              
Risk-free interest rate                               0.25%              
Expected dividends | €                               € 0              
Fair value per BSA (in EUR per share) | € / shares                               € 4.73              
BSA 2017                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       37,000 37,000 37,000  
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                       37,000 37,000 37,000  
Vesting period (years)                           2 years                  
Number of free shares granted (in shares)                           37,000           37,000 37,000 37,000  
Share entitlement per free share (in shares)                           1                  
Exercise price (in EUR per share) | € / shares                           € 11.00                  
Grant date share fair value (in EUR per share) | € / shares                           € 10.41                  
Expected volatility                           61.74%                  
Average life of BSA                           6 years                  
Risk-free interest rate                           0.20%                  
Expected dividends | €                           € 0                  
Fair value per BSA (in EUR per share) | € / shares                           € 0.57                  
BSA 2022-1                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       8,260 8,260 8,260  
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                       8,260 8,260 8,260  
Vesting period (years)             2 years                                
Number of free shares granted (in shares)             40,000                         40,000 40,000 40,000  
Share entitlement per free share (in shares)             1                                
Exercise price (in EUR per share) | € / shares             € 2.31                                
Grant date share fair value (in EUR per share) | € / shares             € 1.31                                
Expected volatility             50.00%                                
Average life of BSA             5 years 6 months                                
Risk-free interest rate             2.40%                                
Expected dividends | €             € 0                                
Fair value per BSA (in EUR per share) | € / shares             € 1.21                                
BSA 2023-1                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       38,000 38,000 38,000  
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                       38,000 38,000 38,000  
Vesting period (years)             2 years                                
Number of free shares granted (in shares)             50,000                         50,000 50,000 50,000  
Share entitlement per free share (in shares)             1                                
Exercise price (in EUR per share) | € / shares             € 2.26                                
Grant date share fair value (in EUR per share) | € / shares             € 1.24                                
Expected volatility             45.00%                                
Average life of BSA             5 years 6 months                                
Risk-free interest rate             2.50%                                
Expected dividends | €             € 0                                
Fair value per BSA (in EUR per share) | € / shares             € 1.24                                
BSA-2025-1                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       50,000 0 0  
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                       50,000 0 0  
Vesting period (years) 2 years                                            
Number of free shares granted (in shares) 80,000                                     80,000      
Share entitlement per free share (in shares) 1                                            
Exercise price (in EUR per share) | € / shares € 0.64                                            
Grant date share fair value (in EUR per share) | € / shares € 0.98                                            
Expected volatility 45.00%                                            
Average life of BSA 5 years 6 months                                            
Risk-free interest rate 2.50%                                            
Expected dividends | € € 0                                            
Fair value per BSA (in EUR per share) | € / shares € 0.98                                            
BSAAR                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       0 1,045,722 1,045,722 1,105,072
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                       0 1,045,722 1,045,722  
Number of free shares granted (in shares)                                       0 0 0  
BSAAR 2011                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       0 0 0  
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                       0 0 0  
Number of free shares granted (in shares)                                       650,000 650,000 650,000  
BSAAR 2012                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       0 0 0  
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                       0 0 0  
Number of free shares granted (in shares)                                       146,050 146,050 146,050  
BSAAR 2015                                              
Disclosure of terms and conditions of share-based payment arrangement [Line Items]                                              
Number of other equity instruments outstanding in share-based payment arrangement (in shares)                                       0 1,045,722 1,045,722  
Number of other equity instruments exercisable in share-based payment arrangement (in shares)                                       0 1,045,722 1,045,722  
Vesting period (years)                               2 years              
Number of free shares granted (in shares)                               1,050,382       1,050,382 1,050,382 1,050,382  
Share entitlement per free share (in shares)                               1              
Exercise price (in EUR per share) | € / shares                               € 7.20              
Grant date share fair value (in EUR per share) | € / shares                               € 13.77              
Expected volatility                               41.00%              
Average life of BSA                               10 years              
Risk-free interest rate                               1.22%              
Expected dividends | €                               € 0              
Fair value per BSA (in EUR per share) | € / shares                               € 1.15