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Loss per share - Securities excluded (Details) - shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Net (loss) income per share      
Dilutive securities excluded 277,452,472 891,022,043 715,043,731
Series A-1 Preferred Shares      
Net (loss) income per share      
Dilutive securities excluded   102,102,318 102,102,318
Redeemable Convertible Preferred Shares      
Net (loss) income per share      
Dilutive securities excluded   612,941,413 612,941,413
Share options | Employees      
Net (loss) income per share      
Dilutive securities excluded 104,543,578 175,978,312  
Share options | Series C preferred shareholder      
Net (loss) income per share      
Dilutive securities excluded 172,908,894