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Capital and reserves - Company repurchased (Details)
$ / shares in Units, ¥ in Thousands, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2022
USD ($)
$ / shares
shares
Jun. 30, 2022
CNY (¥)
Jun. 30, 2022
USD ($)
$ / shares
shares
Jun. 30, 2022
CNY (¥)
Jan. 31, 2020
shares
Disclosure of classes of share capital [line items]          
Number of shares repurchased | shares 6,111,276   6,111,276   111,043,373
Aggregate price paid $ 12,763 ¥ 82,160   ¥ 82,160  
December 2021          
Disclosure of classes of share capital [line items]          
Number of shares repurchased | shares 809,040   809,040    
Aggregate price paid | $     $ 1,979    
January 2022          
Disclosure of classes of share capital [line items]          
Number of shares repurchased | shares 674,036   674,036    
Aggregate price paid | $     $ 1,624    
February 2022          
Disclosure of classes of share capital [line items]          
Number of shares repurchased | shares 700,712   700,712    
Aggregate price paid | $     $ 1,638    
March 2022          
Disclosure of classes of share capital [line items]          
Number of shares repurchased | shares 1,612,600   1,612,600    
Aggregate price paid | $     $ 3,371    
April 2022          
Disclosure of classes of share capital [line items]          
Number of shares repurchased | shares 610,024   610,024    
Aggregate price paid | $     $ 1,180    
May 2022          
Disclosure of classes of share capital [line items]          
Number of shares repurchased | shares 702,104   702,104    
Aggregate price paid | $     $ 1,100    
June 2022          
Disclosure of classes of share capital [line items]          
Number of shares repurchased | shares 1,002,760   1,002,760    
Aggregate price paid | $     $ 1,871    
Minimum. | December 2021          
Disclosure of classes of share capital [line items]          
Price paid per share $ 2.34   $ 2.34    
Minimum. | January 2022          
Disclosure of classes of share capital [line items]          
Price paid per share 2.23   2.23    
Minimum. | February 2022          
Disclosure of classes of share capital [line items]          
Price paid per share 2.03   2.03    
Minimum. | March 2022          
Disclosure of classes of share capital [line items]          
Price paid per share 1.58   1.58    
Minimum. | April 2022          
Disclosure of classes of share capital [line items]          
Price paid per share 1.75   1.75    
Minimum. | May 2022          
Disclosure of classes of share capital [line items]          
Price paid per share 1.28   1.28    
Minimum. | June 2022          
Disclosure of classes of share capital [line items]          
Price paid per share 1.28   1.28    
Maximum. | December 2021          
Disclosure of classes of share capital [line items]          
Price paid per share 2.50   2.50    
Maximum. | January 2022          
Disclosure of classes of share capital [line items]          
Price paid per share 2.48   2.48    
Maximum. | February 2022          
Disclosure of classes of share capital [line items]          
Price paid per share 2.48   2.48    
Maximum. | March 2022          
Disclosure of classes of share capital [line items]          
Price paid per share 2.48   2.48    
Maximum. | April 2022          
Disclosure of classes of share capital [line items]          
Price paid per share 2.10   2.10    
Maximum. | May 2022          
Disclosure of classes of share capital [line items]          
Price paid per share 1.95   1.95    
Maximum. | June 2022          
Disclosure of classes of share capital [line items]          
Price paid per share $ 2.38   $ 2.38