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Equity method investment, net - Summary combined unaudited financial information (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2019
CNY (¥)
Summary combined unaudited financial information for these equity method investees            
Current assets ¥ 858,895   ¥ 1,627,299   $ 124,528  
Non-current assets 217,784   285,684   31,576  
Total assets 1,076,679   1,912,983   156,104  
Current liabilities 949,721   1,580,731   137,697  
Total liabilities 981,285   1,609,306   142,273  
Equity 95,394   303,677 ¥ 1,465,998 13,831 ¥ 1,589,055
Total liabilities and equity 1,076,679   1,912,983   $ 156,104  
Revenue 245,948 $ 35,659 942,380 2,451,287    
Net (loss) income for the year (239,588) $ (34,737) (1,202,997) (221,375)    
Equity method investees            
Summary combined unaudited financial information for these equity method investees            
Current assets 854,415   746,693      
Non-current assets 171,618   173,579      
Total assets 1,026,033   920,272      
Current liabilities 226,849   207,316      
Total liabilities 226,849   207,316      
Equity 799,184   712,956      
Total liabilities and equity 1,026,033   920,272      
Revenue 5,569   4,094 56,545    
Operating income/(loss) (14,412)   (4,253) 22,009    
Net (loss) income for the year ¥ (14,093)   ¥ (3,994) ¥ 22,431