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Share-based payments - Summary of number of shares in active share option plans (Details) - Option | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Share option plan, granted in 2012 | Options outstanding (exercisable) |  |
Share-based payments |  |
At beginning of period | 168,551 | 179,519
Shares lapsed | (125) |
Shares exercised | (168,426) | (10,968)
At end of period |  | 168,551
Share option plan, granted in 2013 | Options outstanding (not exercisable) |  |
Share-based payments |  |
Shares awarded | 16,964 | 12,073
Shares vested | (16,964) | (12,073)
Share option plan, granted in 2013 | Options outstanding (exercisable) |  |
Share-based payments |  |
At beginning of period | 1,025,307 | 1,085,178
Shares vested | 16,964 | 12,073
Shares exercised | (137) | (71,944)
At end of period | 1,042,134 | 1,025,307
Share option plan, granted in 2014 | Options outstanding (not exercisable) |  |
Share-based payments |  |
Shares awarded | 19,487 | 13,693
Shares vested | (19,487) | (13,693)
Share option plan, granted in 2014 | Options outstanding (exercisable) |  |
Share-based payments |  |
At beginning of period | 1,188,070 | 1,200,990
Shares lapsed | (2) |
Shares vested | 19,487 | 13,693
Shares exercised | (11,367) | (26,613)
At end of period | 1,196,188 | 1,188,070
Share option plan, granted in 2015 | Options outstanding (not exercisable) |  |
Share-based payments |  |
Shares awarded | 21,107 | 15,831
Shares vested | (21,107) | (15,831)
Share option plan, granted in 2015 | Options outstanding (exercisable) |  |
Share-based payments |  |
At beginning of period | 1,364,269 | 1,398,235
Shares vested | 21,107 | 15,831
Shares exercised | (118,858) | (49,797)
At end of period | 1,266,518 | 1,364,269
Share option plan, granted in 2016 | Options outstanding (not exercisable) |  |
Share-based payments |  |
Shares awarded | 30,808 | 22,920
Shares lapsed |  | (15)
Shares vested | (30,808) | (22,905)
Share option plan, granted in 2016 | Options outstanding (exercisable) |  |
Share-based payments |  |
At beginning of period | 1,942,074 | 2,052,013
Shares lapsed | (58) | (1,323)
Shares vested | 30,808 | 22,905
Shares exercised | (131,628) | (131,521)
At end of period | 1,841,196 | 1,942,074
Share option plan, granted in 2017 | Options outstanding (not exercisable) |  |
Share-based payments |  |
Shares awarded | 24,878 | 19,720
Shares lapsed |  | (85)
Shares vested | (24,878) | (19,635)
Share option plan, granted in 2017 | Options outstanding (exercisable) |  |
Share-based payments |  |
At beginning of period | 1,625,618 | 1,784,890
Shares lapsed | (1,025) | (7,720)
Shares vested | 24,878 | 19,635
Shares exercised | (324,744) | (171,187)
At end of period | 1,324,727 | 1,625,618
Share option plan, granted in 2018 | Options outstanding (not exercisable) |  |
Share-based payments |  |
At beginning of period | 891,744 | 6,024,191
Shares awarded | 34,531 | 164,397
Shares lapsed | (5,910) | (1,066,488)
Shares vested | (905,768) | (4,230,356)
At end of period | 14,597 | 891,744
Share option plan, granted in 2018 | Options outstanding (exercisable) |  |
Share-based payments |  |
At beginning of period | 1,538,591 |
Shares lapsed | (5,058) |
Shares vested | 905,768 | 4,230,356
Shares exercised | (451,433) | (2,691,765)
At end of period | 1,987,868 | 1,538,591
Share option plan, granted in 2019 | Options outstanding (not exercisable) |  |
Share-based payments |  |
At beginning of period | 4,776,149 | 4,993,019
Shares awarded | 132,345 | 33,885
Shares lapsed | (332,441) | (250,755)
Shares vested | (4,114,390) |
At end of period | 461,663 | 4,776,149
Share option plan, granted in 2019 | Options outstanding (exercisable) |  |
Share-based payments |  |
Shares lapsed | (22,984) |
Shares vested | 4,114,390 |
Shares exercised | (1,878,327) |
At end of period | 2,213,079 |
Share option plan, granted in 2020 | Options outstanding (not exercisable) |  |
Share-based payments |  |
At beginning of period | 3,471,012 | 3,561,710
Shares awarded |  | 754
Shares lapsed | (284,625) | (91,452)
At end of period | 3,186,387 | 3,471,012
Share option plan, granted in 2021 | Options outstanding (not exercisable) |  |
Share-based payments |  |
At beginning of period | 4,137,673 |
Shares awarded |  | 4,228,162
Shares lapsed | (339,688) | (90,489)
At end of period | 3,797,985 | 4,137,673
Share Option Plan, Granted In 2022 | Options outstanding (not exercisable) |  |
Share-based payments |  |
Shares awarded | 4,964,496 |
Shares lapsed | (118,596) |
At end of period | 4,845,900 |

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