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Loss per share - Anti-dilutive securities (Details) - shares
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Redeemable convertible preferred shares      
Anti-dilutive securities      
Anti-dilutive securities (inshares) 0 0 90,724,289,000
Warrants      
Anti-dilutive securities      
Anti-dilutive securities (inshares) 23,871,971,000 23,871,971,000 0
Options      
Anti-dilutive securities      
Anti-dilutive securities (inshares) 11,260,718,000 12,853,364,000 0
Convertible notes      
Anti-dilutive securities      
Anti-dilutive securities (inshares) 5,652,174,000 5,652,174,000 0