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Loss per share (Details)
¥ / shares in Units, ¥ in Thousands
12 Months Ended
Dec. 31, 2022
CNY (¥)
¥ / shares
shares
Dec. 31, 2021
CNY (¥)
¥ / shares
shares
Dec. 31, 2020
CNY (¥)
¥ / shares
shares
Dec. 12, 2022
Dec. 11, 2022
Loss per share          
Net loss for the year attributable to owners of the Company | ¥ ¥ (872,274) ¥ (1,281,699) ¥ (1,353,608)    
Weighted average number of ordinary shares in issue | shares 1,094,748,000 1,108,291,000 1,064,710,000    
Basic loss per share ¥ (0.80) ¥ (1.16) ¥ (1.27)    
Diluted loss per share (0.80) (1.16) (1.27)    
Basic loss per ADS (23.90) (34.69) (38.14)    
Diluted loss per ADS ¥ (23.90) ¥ (34.69) ¥ (38.14)    
ADSs ratio 30     30 3
Stock options          
Loss per share          
Number of shares issued | shares 1,089,589,125 1,109,938,973 1,104,233,317    
Number of ordinary shares outstanding | shares 1,089,589,125 1,109,938,973 1,104,233,317