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Share-based compensation - Narratives (Details)
12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Share-based compensation      
Number of shares granted 2,358,458 1,801,088  
Share-based compensation expenses $ 4,100,000 $ 3,900,000 $ 600,000
Bottom of range      
Share-based compensation      
Incremental discount rate 10.00%    
Top of range      
Share-based compensation      
Option exercisable term (in years) 10 years    
Incremental discount rate 25.00%    
Vesting schemes one      
Share-based compensation      
Vesting period 36 months    
Vesting percentage 25.00%    
Vesting percentage of remaining awards 75.00%    
Vesting percentage total 100.00%    
Vesting schemes two      
Share-based compensation      
Vesting period 48 months    
Vesting percentage total 100.00%    
Vesting schemes three      
Share-based compensation      
Vesting period 12 months    
Vesting percentage total 100.00%