v3.26.1
10-K Share-based compensation - Stock options activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Number of options        
Outstanding, beginning (in shares) 10,618,602      
Forfeited (in shares) (283,439)      
Expired (in shares) (169,736)      
Exercised (in shares) (996,576)      
Granted (in shares) 87,477      
Outstanding, ending (in shares) 9,256,328 10,618,602    
Options exercisable (in shares) 3,275,631      
Weighted average exercise price        
Outstanding, beginning (in dollars per share) $ 8.658      
Forfeited (in dollars per share) 4.257      
Expired (in dollars per share) 28.560      
Exercised (in dollars per share) 0.480      
Granted (in dollars per share) 6.915      
Outstanding, ending (in dollars per share) 9.291 $ 8.658    
Options exercisable (in dollars per share) $ 10.947      
Additional information        
Weighted average remaining contractual life 7 years 25 days      
Aggregate intrinsic value $ 15,444      
Exercisable, Weighted average remaining contractual term 5 years 5 months 1 day      
Exercisable, Aggregate intrinsic value $ 5,965      
2018 Long Term Incentive Plan        
Number of options        
Outstanding, beginning (in shares) 10,618,602 9,887,023 9,310,868 8,179,723
Forfeited (in shares)   (2,284,138) (487,165) (856,521)
Expired (in shares)   (737,931) (143,459) (807,244)
Exercised (in shares)   (621,424) (25,130) (70,590)
Granted (in shares)   4,375,072 1,231,909 2,865,500
Outstanding, ending (in shares)   10,618,602 9,887,023 9,310,868
Options exercisable (in shares)   3,374,323 5,572,751 4,989,095
Weighted average exercise price        
Outstanding, beginning (in dollars per share) $ 8.658 $ 14.940 $ 15.870 $ 20.01
Forfeited (in dollars per share)   21.933 13.542 22.20
Expired (in dollars per share)   26.877 44.220 27.72
Exercised (in dollars per share)   0.411 6.180 0.69
Granted (in dollars per share)   3.279 10.595 8.91
Outstanding, ending (in dollars per share)   8.658 14.940 15.870
Options exercisable (in dollars per share)   $ 10.596 $ 16.621 $ 16.23
Additional information        
Weighted average remaining contractual life   6 years 7 months 24 days 5 years 6 months 6 years 3 months 14 days
Aggregate intrinsic value   $ 28,364 $ 8,846 $ 34,646
Exercisable, Weighted average remaining contractual term   3 years 10 days 3 years 4 months 24 days 4 years 2 months 19 days
Exercisable, Aggregate intrinsic value   $ 10,928 $ 8,778 $ 25,679