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Share-based compensation - Share Options (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Additional Information      
Total share-based compensation expense $ 38,081 $ 32,477 $ 26,779
Stock option      
Number of Shares      
Outstanding number of shares at beginning 7,469,527    
Granted 2,438,356    
Exercised (554,596)    
Forfeited (604,561)    
Outstanding number of shares at end 8,748,726 7,469,527  
Number of shares, vested and expected to vest 8,748,726    
Number of shares, options exercisable 5,359,049    
Weighted Average Exercise Price      
Weighted average exercise price at beginning $ 23.13    
Granted 19.42    
Exercised 13.57    
Forfeited 27.37    
Weighted average exercise price at ending 22.41 $ 23.13  
Weighted average exercise price, vested and expected to vest 22.41    
Weighted average exercise price, options exercisable $ 21.65    
Weighted Average Contractual Term      
Weighted average contractual term, outstanding 6 years 9 months 21 days 6 years 9 months 29 days  
Weighted average contractual term, vested and expected to vest 6 years 9 months 21 days    
Weighted average contractual term ,options exercisable 5 years 7 months 6 days    
Aggregate Intrinsic Value      
Aggregate intrinsic value outstanding $ 9,559 $ 21,920  
Aggregate intrinsic value, vested and expected to vest 9,559    
Aggregate intrinsic value, options exercisable $ 9,559    
Additional Information      
Granted $ 13.52 $ 19.36 $ 31.45
Exercised $ 5,100 $ 500 $ 1,500
Total share-based compensation expense $ 30,200 $ 27,000 $ 21,900