v3.26.1
Share-based compensation plan - Stock option activity (Details)
 6 Months Ended 12 Months Ended
Aug. 06, 2025
Jun. 30, 2026
$ / shares
shares
Dec. 31, 2025
$ / shares
shares
Dec. 31, 2024
$ / shares
shares
Dec. 31, 2023
shares
Weighted average exercise          
Reverse stock split conversion ratio 0.10 0.1 0.10 0.10  
Equity classified stock options          
Number of options outstanding          
Beginning Balance (in shares) | shares   7,513,891 5,343,631 1,323,045 1,480,514
Stock options granted (in shares) | shares   2,800,000 4,127,700 94,500  
Stock options exercised (in shares) | shares   (30,406) (5,063) (24,900)  
Stock options forfeited and cancelled (in shares) | shares   (593,834) (97,301) (227,069)  
Stock option expired (in shares) | shares   (5,500) (4,750)    
Ending Balance (in shares) | shares   7,513,891 5,343,631 1,323,045  
Stock options exercisable (in shares) | shares   2,698,059 2,705,028    
Weighted average exercise          
Beginning Balance (in dollars per share)   $ 0.25 $ 7.24 $ 7.44  
Stock options granted (in dollars per share)   1.53 0.2 9.3  
Stock options exercised (in dollars per share)   0.36 3.58 3.69  
Stock options forfeited and cancelled (in dollars per share)   0.16 6.38 8.13  
Stock option expired (in dollars per share)   0.93 3.58    
Stock option modification     (1.61)    
Ending Balance (in dollars per share)   0.73 0.25 $ 7.24  
Stock options exercisable (in dollars per share)   $ 0.36 $ 0.36    
Reverse stock split conversion ratio 0.1   0.10 0.10  
Liability classified stock options          
Number of options outstanding          
Beginning Balance (in shares) | shares   35,177,211 23,744,418 1,829,531 1,527,750
Stock options granted (in shares) | shares   11,496,500 22,203,841 312,250  
Stock options exercised (in shares) | shares   (10,016) (9,517) (16)  
Stock options forfeited and cancelled (in shares) | shares   (53,691) (279,437) (10,453)  
Ending Balance (in shares) | shares   35,177,211 23,744,418 1,829,531  
Stock options exercisable (in shares) | shares   11,372,261 11,231,053    
Weighted average exercise          
Beginning Balance (in dollars per share)   $ 0.17 $ 11.62 $ 12.1  
Stock options granted (in dollars per share)   1.53 0.1 9.3  
Stock options exercised (in dollars per share)   0.13 0.09 15.5  
Stock options forfeited and cancelled (in dollars per share)   0.21 5.62 12.57  
Stock option modification     (0.75)    
Ending Balance (in dollars per share)   0.62 0.17 $ 11.62  
Stock options exercisable (in dollars per share)   $ 0.22 $ 0.21    
Reverse stock split conversion ratio 0.1   0.10 0.10