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Share-based compensation - Number of option and exercise price (Details)
12 Months Ended
Dec. 31, 2023
Option
shares
$ / shares
Dec. 31, 2022
Option
shares
$ / shares
Dec. 31, 2021
Option
$ / shares
Share-based compensation      
Granted, Number of options | shares 879,771 2,358,458  
Weighted average share price   $ 2.94  
2018 Stock Option Plan      
Share-based compensation      
Outstanding at Beginning, Number of options | Option 600,457 620,347  
Exercised, Number of options | Option   (16,073)  
Lapsed, Number of options | Option   778  
Forfeited, Number of options | Option   (3,039)  
Outstanding at ending, Number of options | Option 600,457 600,457 620,347
Exercisable, Number of options | Option 488,972    
Outstanding at Beginning, Weighted average exercise price $ 0.01 $ 0.01  
Exercised, Weighted average exercise price   0.01  
Lapsed, Weighted average exercise price.   0.01  
Forfeited, Weighted average exercise price   0.01  
Outstanding at ending, Weighted average exercise price 0.01 $ 0.01 $ 0.01
2018 Stock Option Plan | Bottom of range      
Share-based compensation      
Exercised, Weighted average exercise price 0.01    
2018 Stock Option Plan | Top of range      
Share-based compensation      
Exercised, Weighted average exercise price $ 15.00    
2020 U.S. Stock Option Plan,      
Share-based compensation      
Outstanding at Beginning, Number of options | Option 1,272,079 1,563,136  
Exercised, Number of options | Option   (6,124)  
Lapsed, Number of options | Option 153,389 72,773  
Forfeited, Number of options | Option (118,935) (212,160)  
Outstanding at ending, Number of options | Option 999,755 1,272,079 1,563,136
Exercisable, Number of options | Option 792,401    
Outstanding at Beginning, Weighted average exercise price $ 4.22 $ 5.90  
Exercised, Weighted average exercise price   2.76  
Lapsed, Weighted average exercise price. 3.75 15.00  
Forfeited, Weighted average exercise price 2.76 12.96  
Outstanding at ending, Weighted average exercise price $ 4.46 $ 4.22 $ 5.90
Outstanding, Weighted average remaining contractual term 7 years 14 days 7 years 9 months 29 days 8 years 10 months 24 days
2021 Long-term Incentive Option Plan      
Share-based compensation      
Outstanding at Beginning, Number of options | Option 3,407,594 1,307,150  
Granted, Number of options 879,771 2,358,458  
Lapsed, Number of options | Option 204,639 20,419  
Forfeited, Number of options | Option (422,420) (237,595)  
Outstanding at ending, Number of options 3,660,306 3,407,594 1,307,150
Exercisable, Number of options | Option 1,158,244    
Outstanding at Beginning, Weighted average exercise price $ 4.66 $ 6.03  
Granted, Weighted average exercise price 3.17 4.01  
Lapsed, Weighted average exercise price. 5.69 5.16  
Forfeited, Weighted average exercise price 4.50 5.80  
Outstanding at ending, Weighted average exercise price $ 4.27 $ 4.66 $ 6.03
Outstanding, Weighted average remaining contractual term 8 years 8 months 23 days 9 years 6 months 14 days 9 years 10 months 24 days
Granted, Weighted average remaining contractual term 9 years 1 month 20 days 9 years 9 months 14 days