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Derivative liability (Details)
¥ in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Aug. 31, 2021
CNY (¥)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2021
USD ($)
Aug. 31, 2021
USD ($)
Debt Instrument [Line Items]              
Debt instrument term 2 years            
Basic interest rate   4.50%       4.50%  
Additional interest rate   5.50% 5.50%        
Change in fair value of derivative liability (note 21)   ¥ 39 $ 6   ¥ 0    
Net proceeds from issuance of debt   386,635 60,671 ¥ 857,110 ¥ 934,406    
Amortization of debt   ¥ 5,824 $ 914        
Amortization period   2 years 2 years        
Great Lion Debt              
Debt Instrument [Line Items]              
Principal amount ¥ 31,863           $ 5,000
Basic interest rate 11.00%           11.00%
Derivative liability, Notional amount   ¥ 1,969       $ 309  
Fair value of embedded derivative   1,937       304  
Net proceeds from issuance of debt   31,863 $ 5,000        
Debt instrument, Carrying amount   89,765       14,086  
Vantage Debt              
Debt Instrument [Line Items]              
Principal amount ¥ 63,726           $ 10,000
Basic interest rate 22.00%           22.00%
Derivative liability, Notional amount   3,894       611  
Fair value of embedded derivative   3,887       610  
Net proceeds from issuance of debt   63,726 $ 10,000        
Debt instrument, Carrying amount   ¥ 89,726       $ 14,080