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Share-based payments - Disclosure of reconciliation of BSAs (Details) - shares
 1 Months Ended 12 Months Ended 130 Months Ended
Apr. 04, 2024
Jan. 22, 2018
Sep. 18, 2017
Dec. 04, 2015
Mar. 11, 2014
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
Total BSAs                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Number of instruments outstanding, beginning balance (in shares)             147,196  
Number of instruments issued (in shares)             324,446
Number of instruments lapsed (in shares)             (1,072)  
Number of instruments exercised (in shares)             0  
Number of instruments outstanding, ending balance (in shares)             223,944 223,944
Number of instruments exercisable (in shares)             146,124 146,124
Maximum number of shares to be issued if all conditions are met (in shares)             223,944 223,944
BSA-2015-11                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Number of instruments outstanding, beginning balance (in shares)             96,924  
Number of instruments issued (in shares)       96,924     0  
Number of instruments lapsed (in shares)             0  
Number of instruments exercised (in shares)             0  
Number of instruments outstanding, ending balance (in shares)             96,924 96,924
Number of instruments exercisable (in shares)             96,924 96,924
Maximum number of shares to be issued if all conditions are met (in shares)             96,924 96,924
BSA-2015-12                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Number of instruments outstanding, beginning balance (in shares)             16,400  
Number of instruments issued (in shares)       82,000     0  
Number of instruments lapsed (in shares)             0  
Number of instruments exercised (in shares)             0  
Number of instruments outstanding, ending balance (in shares)             16,400 16,400
Number of instruments exercisable (in shares)             16,400 16,400
Maximum number of shares to be issued if all conditions are met (in shares)             16,400 16,400
BSA-2017-1                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Number of instruments outstanding, beginning balance (in shares)             16,400  
Number of instruments issued (in shares)     16,400       0  
Number of instruments lapsed (in shares)             0  
Number of instruments exercised (in shares)             0  
Number of instruments outstanding, ending balance (in shares)             16,400 16,400
Number of instruments exercisable (in shares)             16,400 16,400
Maximum number of shares to be issued if all conditions are met (in shares)             16,400 16,400
BSA-2018-1                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Number of instruments outstanding, beginning balance (in shares)             16,400  
Number of instruments issued (in shares)   49,200         0  
Number of instruments lapsed (in shares)             0  
Number of instruments exercised (in shares)             0  
Number of instruments outstanding, ending balance (in shares)             16,400 16,400
Number of instruments exercisable (in shares)             16,400 16,400
Maximum number of shares to be issued if all conditions are met (in shares)             16,400 16,400
BSA-2014-4                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Number of instruments outstanding, beginning balance (in shares)             842  
Number of instruments issued (in shares)         1,315   0  
Number of instruments lapsed (in shares)             (842)  
Number of instruments exercised (in shares)             0  
Number of instruments outstanding, ending balance (in shares)             0 0
Number of instruments exercisable (in shares)             0 0
Maximum number of shares to be issued if all conditions are met (in shares)             0 0
BSA-2014-5                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Number of instruments outstanding, beginning balance (in shares)             230  
Number of instruments issued (in shares)         787   0  
Number of instruments lapsed (in shares)             (230)  
Number of instruments exercised (in shares)             0  
Number of instruments outstanding, ending balance (in shares)             0 0
Number of instruments exercisable (in shares)             0 0
Maximum number of shares to be issued if all conditions are met (in shares)             0 0
BSA 2024-1                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Number of instruments outstanding, beginning balance (in shares)             0  
Number of instruments issued (in shares) 58,365         77,820 0  
Number of instruments lapsed (in shares)             0  
Number of instruments exercised (in shares)             0  
Number of instruments outstanding, ending balance (in shares)             58,365 58,365
Number of instruments exercisable (in shares)             0 0
Maximum number of shares to be issued if all conditions are met (in shares)             58,365 58,365
BSA 2024-2                
Disclosure of terms and conditions of share-based payment arrangement [line items]                
Number of instruments outstanding, beginning balance (in shares)             0  
Number of instruments issued (in shares) 19,455           0  
Number of instruments lapsed (in shares)             0  
Number of instruments exercised (in shares)             0  
Number of instruments outstanding, ending balance (in shares)             19,455 19,455
Number of instruments exercisable (in shares)             0 0
Maximum number of shares to be issued if all conditions are met (in shares)             19,455 19,455