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Share-based payments - Fair value of options and related parameters used to estimate the fair value of options (Details)
1 Months Ended
Jan. 01, 2021
$ / shares
Jan. 01, 2019
USD ($)
item
Nov. 30, 2021
USD ($)
shares
Share-based payments      
Number of complex options     1,300
Number of options modified | shares     4,414,608
Modification of complex options      
Share-based payments      
Equity value, US$ mln   $ 132,000,000  
Expected volatility   41.00%  
Dividend yield   6.80%  
Proxy net income indicator   $ 0.041201  
Discount for Lack of Marketability   8.40%  
Total FV for 1,300 complex options   $ 7,856.12  
Number of complex options | item   1,300  
Strike (exercise) price, US$ | $ / shares $ 0.00