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Loss per share - Securities excluded (Details) - shares
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Loss per share      
Dilutive securities excluded 74,131,026 130,156,288 93,464,488
Share options | Employees      
Loss per share      
Dilutive securities excluded 74,131,026 130,156,288 93,464,488