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Loss per share - Reconciliation (Details)
¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2022
CNY (¥)
¥ / shares
shares
Dec. 31, 2022
USD ($)
$ / shares
shares
Dec. 31, 2021
CNY (¥)
¥ / shares
shares
Dec. 31, 2020
CNY (¥)
¥ / shares
shares
Numerator:        
Net loss ¥ (239,588) $ (34,737) ¥ (1,202,997) ¥ (221,375)
Net loss(income) attributable to noncontrolling interests (4,450) $ (645) 31,832 1,087
Numerator for basic and diluted net loss per share calculation | ¥ ¥ (244,038)   ¥ (1,171,165) ¥ (220,288)
Denominator:        
Weighted average number of ordinary shares 2,078,624,721 2,078,624,721 2,022,446,988 1,993,326,758
Weighted average number of ordinary shares, diluted 2,078,624,721 2,078,624,721 2,022,446,988 1,993,326,758
Basic (in dollars per share) | (per share) ¥ (0.12) $ (0.02) ¥ (0.58) ¥ (0.11)
Diluted (in dollars per share) | (per share) ¥ (0.12) $ (0.02) ¥ (0.58) ¥ (0.11)