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Share-based payments - Share options (Details)
 12 Months Ended
Dec. 30, 2021
Options
Nov. 15, 2021
Options
Jun. 17, 2021
Options
May 21, 2021
Options
Mar. 11, 2021
Options
Dec. 22, 2020
Options
Dec. 15, 2020
Options
Nov. 16, 2020
Options
Aug. 17, 2020
Options
Jun. 08, 2020
Options
May 20, 2020
Options
Mar. 12, 2020
Options
Dec. 31, 2021
EquityInstruments
Options
shares
Dec. 31, 2020
EquityInstruments
Options
Share-based payments                            
Number of share options granted in share-based payment arrangement 105,071 24,500 1,000 555,464 12,000 11,500 10,000 84,900 2,900 80,000 481,405 16,550 698,035 687,255
Share Option Plan                            
Share-based payments                            
Number of share options granted in share-based payment arrangement                     2,700,908      
Number of other equity instruments outstanding in share-based payment arrangement | EquityInstruments                         2,092,596 1,522,362
Number of each option granted to purchase common shares | shares                         1  
Number of trading days preceding the date the share option granted                         5 days  
Maximum term of share options granted                         10 years  
Maximum period of share options vested                         4 years