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Loss per share (Details) - shares
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Preferred shares      
Loss per share      
Antidilutive securities excluded from computation of diluted net loss per share 3,945,881,532 3,837,917,495 3,746,626,700
Share options      
Loss per share      
Antidilutive securities excluded from computation of diluted net loss per share 76,965,197 64,117,791 41,350,000