v3.26.1
Issued capital and reserves - Narratives (Details)
1 Months Ended 2 Months Ended 12 Months Ended
Jul. 07, 2025
USD ($)
$ / shares
shares
Sep. 26, 2023
USD ($)
$ / shares
shares
Aug. 15, 2023
$ / shares
shares
Jun. 27, 2023
USD ($)
Apr. 12, 2023
USD ($)
$ / shares
shares
Aug. 15, 2022
$ / shares
shares
Feb. 18, 2019
USD ($)
$ / shares
shares
Oct. 26, 2018
shares
Apr. 14, 2015
$ / shares
shares
Feb. 28, 2026
$ / shares
shares
Oct. 31, 2025
USD ($)
shares
Sep. 30, 2025
USD ($)
shares
Dec. 31, 2025
USD ($)
$ / shares
shares
Dec. 31, 2024
€ / shares
shares
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2025
category
€ / shares
shares
Oct. 27, 2025
$ / shares
Dec. 31, 2022
shares
Disclosure of classes of share capital [line items]                                    
Authorised capital (in shares)                           398,622,649 421,418,563 6,659,905,825    
Par value per share (in usd per share) | € / shares                           € 0.01   € 0.01    
Number of categories of authorized shares | category                               1    
Average price per ADS (ADS per share) | $ / shares                         $ 6.17          
Number of treasury shares repurchased (in shares)                           0 0      
Share price per ADS (usd per share) | $ / shares $ 14.0 $ 70.75     $ 51.50                          
Share price per pre-funded warrant (in usd per share) | $ / shares $ 0.139                                  
Issue of shares and warrants | $ $ 195,000,001 $ 5,999,999     $ 20,000,000           $ 4,263,193              
Transaction costs | $                         $ 13,992,000   $ 551,000      
Shares outstanding (in shares)                           251,408,922 246,262,004 1,599,589,702    
Share purchase price (in usd per share) | $ / shares                   $ 3.73                
Warrants, exercise price per ADS (in usd per share) | $ / shares $ 14.00                                  
Warrants exercise period 90 days           61 days                      
Exercise of common warrants issued in July 2025 | $ $ 1,522,500                       $ 1,522,000   $ 82,000      
Exercise price (in dollars per share) | $ / shares             $ 0.02                      
Number of warrants issued (in shares)               816,716                    
Warrant, subscription price (in USD per share) | $ / shares     $ 1.00                              
2015 convertible notes                                    
Disclosure of classes of share capital [line items]                                    
Conversion ratio                 0.5405405                  
ADS                                    
Disclosure of classes of share capital [line items]                                    
Number of shares repurchased (in shares)                     304,513 1,259,431 1,513,973          
Shares outstanding (in shares)                       961,582            
Warrants, exercise price per ADS (in usd per share) | $ / shares     134.00       $ 2.00                      
Exercise of common warrants issued in July 2025 ( in shares) 108,750                                  
ADS | 2019-1 notes                                    
Disclosure of classes of share capital [line items]                                    
Warrants, exercise price per ADS (in usd per share) | $ / shares     $ 80.92     $ 103.00     $ 170.00                  
Number of warrants issued (in shares)     12,448     5,946                        
ADS | Major ordinary share transactions                                    
Disclosure of classes of share capital [line items]                                    
Number of shares repurchased (in shares)                   250,000                
Ordinary shares                                    
Disclosure of classes of share capital [line items]                                    
Par value per share (in usd per share) | $ / shares $ 0.14 $ 0.7075     $ 0.515                       $ 0.14  
Number of shares repurchased (in shares)                   25,000,000     151,397,300          
Shares outstanding (in shares)                       96,158,250            
Exercise of common warrants issued in July 2025 ( in shares) 10,875,000                                  
Number of shares issuable by warrants (in shares)             9,392,986                      
Warrants                                    
Disclosure of classes of share capital [line items]                                    
Exercise price (in dollars per share) | $ / shares     $ 1.34                              
Proceeds from issuing other equity instruments | $             $ 8,360,000           $ 8,360,000          
Warrants | 2019-1 notes                                    
Disclosure of classes of share capital [line items]                                    
Number of warrants issued (in shares)     1,244,820     594,680     1,800,000                  
Exercise price (in dollars per share) | $ / shares     $ 0.8092     $ 1.03     $ 1.70                  
Share premium                                    
Disclosure of classes of share capital [line items]                                    
Issue of shares and warrants | $ $ 181,263,625 $ 5,910,953     $ 19,576,699           $ 3,909,026 $ 76,300            
Transaction costs | $ 14,000,000.0 600,000     $ 400,000               13,992,000   $ 551,000      
Exercise of common warrants issued in July 2025 | $ $ 1,396,382                       $ 1,396,000          
Accumulated deficit                                    
Disclosure of classes of share capital [line items]                                    
Reduction of issued capital | $       $ 12,727,000                            
Ordinary shares                                    
Disclosure of classes of share capital [line items]                                    
Issue of shares and warrants (in shares) 1,171,987,620       38,834,952           30,451,300 125,943,130            
Number of share pre-funded warrants issued (in shares) 222,458,520                                  
Issue of shares and warrants | $ $ 13,736,376 $ 89,046     $ 423,301           $ 354,167              
Shares outstanding (in shares)                           251,408,922 246,262,004 1,599,589,702   193,426,478
Exercise of common warrants issued in July 2025 ( in shares)                         10,875,000          
Exercise of common warrants issued in July 2025 | $ $ 126,118                       $ 126,000          
Ordinary shares | ADS                                    
Disclosure of classes of share capital [line items]                                    
Issue of shares and warrants (in shares)   84,805                                
Number of warrants issued to shareholders (in shares) 2,091,668                                  
Number of warrants issued to debt holders (in shares) 2,024,999                                  
Ordinary shares | Ordinary shares                                    
Disclosure of classes of share capital [line items]                                    
Issue of shares and warrants (in shares)   8,480,564