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Share based compensation - Activities of Company's RSUs (Details) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Number of RSUs    
Outstanding at the beginning 18,995,595 16,224,217
Granted (new RSUs) 6,680,560 2,890,674
Granted (replacement RSUs) 3,419,811 7,708,362
Forfeited (1,244,394) (119,296)
Replaced (3,419,811) (7,708,362)
Outstanding at the end 24,431,761 18,995,595
Vested and expected to vest as of December 31, 2021 24,431,761  
Exercisable as of December 31, 2021 21,191,690  
Weighted Average Exercise Price    
Outstanding at the beginning $ 0.23 $ 0.05
Granted (new RSUs) 0.56 1.23
Granted (replacement RSUs) 0.13 0.28
Forfeited 0.54 0.01
Replaced 1.24 0.28
Outstanding at the end 0.15 0.23
Vested and expected to vest as of December 31, 2021 0.15  
Exercisable as of December 31, 2021 0.06  
Weighted Average Fair value at grant date    
Outstanding at the beginning 5.10 3.66
Granted (new RSUs) 6.92 5.15
Granted (replacement RSUs) 1.47 6.88
Forfeited 4.97 3.71
Replaced 1.47 3.89
Outstanding at the end 5.60 $ 5.10
Vested and expected to vest as of December 31, 2021 5.60  
Exercisable as of December 31, 2021 $ 5.79  
Weighted remaining contractual years    
Vested and expected to vest as of December 31, 2021 7 years 9 months 18 days  
Exercisable as of December 31, 2021 7 years 10 months 28 days  
Aggregate intrinsic value    
Vested and expected to vest as of December 31, 2021 $ 5.76  
Exercisable as of December 31, 2021 $ 5.83