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Share-based compensation - Schedule of exercise price and weighted average contractual term of share options outstanding and exercisable (Details) - Stock options | 12 Months Ended |
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Dec. 31, 2019 Share $ / shares | Dec. 31, 2018 Share $ / shares | Dec. 31, 2017 Share $ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of options outstanding | $ / shares | $ 21.96 | $ 74.53 | $ 4.44
Number of share options outstanding in share-based payment arrangement | Share | 1,454,943 | 485,159 | 206,219
Weighted average remaining contractual life of outstanding share options | 4 years 7 months 2 days | 4 years 3 months 25 days |
Exercise price of exercisable Share options | $ / shares | $ 21.24 | $ 19.91 |
Number of share options exercisable in share-based payment arrangement | Share | 1,200,242 | 253,815 |
2.61 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of options outstanding | $ / shares | $ 2.61 |  |
Number of share options outstanding in share-based payment arrangement | Share | 35,065 |  |
Weighted average remaining contractual life of outstanding share options | 3 years 5 months 26 days |  |
Exercise price of exercisable Share options | $ / shares | $ 2.61 |  |
Number of share options exercisable in share-based payment arrangement | Share | 35,065 |  |
4.42 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of options outstanding | $ / shares | $ 4.42 | $ 4.42 |
Number of share options outstanding in share-based payment arrangement | Share | 99,502 | 149,254 |
Weighted average remaining contractual life of outstanding share options | 2 years 8 months 15 days | 3 years 8 months 15 days |
Exercise price of exercisable Share options | $ / shares | $ 4.42 | $ 4.42 |
Number of share options exercisable in share-based payment arrangement | Share | 99,502 | 149,254 |
5.03 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of options outstanding | $ / shares |  | $ 5.03 |
Number of share options outstanding in share-based payment arrangement | Share |  | 2,488 |
Weighted average remaining contractual life of outstanding share options |  | 11 months 23 days |
Exercise price of exercisable Share options | $ / shares |  | $ 5.03 |
Number of share options exercisable in share-based payment arrangement | Share |  | 2,488 |
5.43 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of options outstanding | $ / shares | $ 5.43 |  |
Number of share options outstanding in share-based payment arrangement | Share | 16,264 |  |
Weighted average remaining contractual life of outstanding share options | 3 years 5 months 26 days |  |
Exercise price of exercisable Share options | $ / shares | $ 5.43 |  |
Number of share options exercisable in share-based payment arrangement | Share | 16,264 |  |
10.65 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of options outstanding | $ / shares | $ 10.65 |  |
Number of share options outstanding in share-based payment arrangement | Share | 3,730 |  |
Weighted average remaining contractual life of outstanding share options | 3 years 5 months 26 days |  |
Exercise price of exercisable Share options | $ / shares | $ 10.65 |  |
Number of share options exercisable in share-based payment arrangement | Share | 3,730 |  |
13.07 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of options outstanding | $ / shares | $ 13.07 |  |
Number of share options outstanding in share-based payment arrangement | Share | 10,855 |  |
Weighted average remaining contractual life of outstanding share options | 3 years 5 months 26 days |  |
Exercise price of exercisable Share options | $ / shares | $ 13.07 |  |
Number of share options exercisable in share-based payment arrangement | Share | 10,855 |  |
13.47 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of options outstanding | $ / shares | $ 13.47 |  |
Number of share options outstanding in share-based payment arrangement | Share | 1,418 |  |
Weighted average remaining contractual life of outstanding share options | 3 years 5 months 26 days |  |
Exercise price of exercisable Share options | $ / shares | $ 13.47 |  |
Number of share options exercisable in share-based payment arrangement | Share | 1,418 |  |
16.08 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of options outstanding | $ / shares | $ 16.08 |  |
Number of share options outstanding in share-based payment arrangement | Share | 18,409 |  |
Weighted average remaining contractual life of outstanding share options | 3 years 5 months 26 days |  |
Exercise price of exercisable Share options | $ / shares | $ 16.08 |  |
Number of share options exercisable in share-based payment arrangement | Share | 18,409 |  |
17.89 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of options outstanding | $ / shares | $ 17.89 |  |
Number of share options outstanding in share-based payment arrangement | Share | 4,178 |  |
Weighted average remaining contractual life of outstanding share options | 3 years 5 months 26 days |  |
Exercise price of exercisable Share options | $ / shares | $ 17.89 |  |
Number of share options exercisable in share-based payment arrangement | Share | 4,178 |  |
18.09 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of options outstanding | $ / shares | $ 18.09 | $ 18.09 |
Number of share options outstanding in share-based payment arrangement | Share | 37,313 | 42,289 |
Weighted average remaining contractual life of outstanding share options | 3 years 4 months 2 days | 4 years 4 months 6 days |
Exercise price of exercisable Share options | $ / shares | $ 18.09 | $ 18.09 |
Number of share options exercisable in share-based payment arrangement | Share | 37,313 | 42,289 |
20.10 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of options outstanding | $ / shares | $ 20.10 | $ 20.10 |
Number of share options outstanding in share-based payment arrangement | Share | 493,363 | 33,169 |
Weighted average remaining contractual life of outstanding share options | 4 years 8 months 19 days | 4 years 3 months 7 days |
Exercise price of exercisable Share options | $ / shares | $ 20.10 | $ 20.10 |
Number of share options exercisable in share-based payment arrangement | Share | 493,363 | 16,584 |
21.11 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of options outstanding | $ / shares | $ 21.11 |  |
Number of share options outstanding in share-based payment arrangement | Share | 12,438 |  |
Weighted average remaining contractual life of outstanding share options | 4 years 8 months 1 day |  |
Exercise price of exercisable Share options | $ / shares | $ 21.11 |  |
Number of share options exercisable in share-based payment arrangement | Share | 12,438 |  |
24.12 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of options outstanding | $ / shares | $ 24.12 |  |
Number of share options outstanding in share-based payment arrangement | Share | 9,950 |  |
Weighted average remaining contractual life of outstanding share options | 4 years 7 months 2 days |  |
Exercise price of exercisable Share options | $ / shares | $ 24.12 |  |
Number of share options exercisable in share-based payment arrangement | Share | 6,219 |  |
26.13 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of options outstanding | $ / shares | $ 26.13 | $ 26.13 |
Number of share options outstanding in share-based payment arrangement | Share | 14,925 | 14,925 |
Weighted average remaining contractual life of outstanding share options | 3 years 7 months 13 days | 4 years 7 months 13 days |
Exercise price of exercisable Share options | $ / shares | $ 26.13 | $ 26.13 |
Number of share options exercisable in share-based payment arrangement | Share | 14,925 | 14,925 |
40.20 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of options outstanding | $ / shares | $ 40.20 |  |
Number of share options outstanding in share-based payment arrangement | Share | 29,851 |  |
Weighted average remaining contractual life of outstanding share options | 4 years 5 months 12 days |  |
Exercise price of exercisable Share options | $ / shares | $ 40.20 |  |
Number of share options exercisable in share-based payment arrangement | Share | 22,388 |  |
44.22 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of options outstanding | $ / shares | $ 44.22 |  |
Number of share options outstanding in share-based payment arrangement | Share | 2,488 |  |
Weighted average remaining contractual life of outstanding share options | 3 years 4 months 28 days |  |
Exercise price of exercisable Share options | $ / shares | $ 44.22 |  |
Number of share options exercisable in share-based payment arrangement | Share | 2,488 |  |
47.24 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of options outstanding | $ / shares | $ 47.24 |  |
Number of share options outstanding in share-based payment arrangement | Share | 1,493 |  |
Weighted average remaining contractual life of outstanding share options | 4 years 4 months 13 days |  |
Exercise price of exercisable Share options | $ / shares | $ 47.24 |  |
Number of share options exercisable in share-based payment arrangement | Share | 1,493 |  |
50.25 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of options outstanding | $ / shares | $ 50.25 |  |
Number of share options outstanding in share-based payment arrangement | Share | 227,861 |  |
Weighted average remaining contractual life of outstanding share options | 5 years 1 month 2 days |  |
Exercise price of exercisable Share options | $ / shares | $ 50.25 |  |
Number of share options exercisable in share-based payment arrangement | Share | 129,353 |  |
52.26 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of options outstanding | $ / shares | $ 52.26 |  |
Number of share options outstanding in share-based payment arrangement | Share | 498 |  |
Weighted average remaining contractual life of outstanding share options | 4 years 2 months 15 days |  |
Exercise price of exercisable Share options | $ / shares | $ 52.26 |  |
Number of share options exercisable in share-based payment arrangement | Share | 498 |  |
55.28 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of options outstanding | $ / shares | $ 55.28 |  |
Number of share options outstanding in share-based payment arrangement | Share | 498 |  |
Weighted average remaining contractual life of outstanding share options | 4 years 1 month 13 days |  |
Exercise price of exercisable Share options | $ / shares | $ 55.28 |  |
Number of share options exercisable in share-based payment arrangement | Share | 498 |  |
56.28 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of options outstanding | $ / shares |  | $ 56.28 |
Number of share options outstanding in share-based payment arrangement | Share |  | 12,438 |
Weighted average remaining contractual life of outstanding share options |  | 4 years 10 months 28 days |
Exercise price of exercisable Share options | $ / shares |  | $ 56.28 |
Number of share options exercisable in share-based payment arrangement | Share |  | 0 |
59.30 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of options outstanding | $ / shares | $ 59.30 | $ 59.30 |
Number of share options outstanding in share-based payment arrangement | Share | 498 | 498 |
Weighted average remaining contractual life of outstanding share options | 3 years 11 months 15 days | 4 years 11 months 15 days |
Exercise price of exercisable Share options | $ / shares | $ 59.30 | $ 59.30 |
Number of share options exercisable in share-based payment arrangement | Share | 498 | 498 |
7.17 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of options outstanding | $ / shares | $ 7.17 |  |
Number of share options outstanding in share-based payment arrangement | Share | 199,005 |  |
Weighted average remaining contractual life of outstanding share options | 4 years 9 months 29 days |  |
Exercise price of exercisable Share options | $ / shares | $ 7.17 |  |
Number of share options exercisable in share-based payment arrangement | Share | 199,005 |  |
7.50 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of options outstanding | $ / shares | $ 7.50 |  |
Number of share options outstanding in share-based payment arrangement | Share | 0 |  |
Exercise price of exercisable Share options | $ / shares | $ 7.50 |  |
Number of share options exercisable in share-based payment arrangement | Share | 0 |  |
75.38 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of options outstanding | $ / shares | $ 75.38 |  |
Number of share options outstanding in share-based payment arrangement | Share | 498 |  |
Weighted average remaining contractual life of outstanding share options | 4 years 14 days |  |
Exercise price of exercisable Share options | $ / shares | $ 75.38 |  |
Number of share options exercisable in share-based payment arrangement | Share | 498 |  |
7.63 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of options outstanding | $ / shares | $ 7.63 |  |
Number of share options outstanding in share-based payment arrangement | Share | 203,750 |  |
Weighted average remaining contractual life of outstanding share options | 5 years 4 months 2 days |  |
Exercise price of exercisable Share options | $ / shares | $ 7.63 |  |
Number of share options exercisable in share-based payment arrangement | Share | 58,750 |  |
86.43 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of options outstanding | $ / shares | $ 86.43 | $ 86.43 |
Number of share options outstanding in share-based payment arrangement | Share | 1,244 | 1,244 |
Weighted average remaining contractual life of outstanding share options | 3 years 10 months 17 days | 4 years 10 months 17 days |
Exercise price of exercisable Share options | $ / shares | $ 86.43 | $ 86.43 |
Number of share options exercisable in share-based payment arrangement | Share | 1,244 | 1,244 |
88.44 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of options outstanding | $ / shares | $ 88.44 | $ 88.44 |
Number of share options outstanding in share-based payment arrangement | Share | 14,925 | 14,925 |
Weighted average remaining contractual life of outstanding share options | 3 years 10 months 13 days | 4 years 10 months 13 days |
Exercise price of exercisable Share options | $ / shares | $ 88.44 | $ 88.44 |
Number of share options exercisable in share-based payment arrangement | Share | 14,925 | 14,925 |
120.60 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of options outstanding | $ / shares | $ 120.60 | $ 120.60 |
Number of share options outstanding in share-based payment arrangement | Share | 9,950 | 9,950 |
Weighted average remaining contractual life of outstanding share options | 3 years 8 months 15 days | 4 years 8 months 15 days |
Exercise price of exercisable Share options | $ / shares | $ 120.60 | $ 120.60 |
Number of share options exercisable in share-based payment arrangement | Share | 9,950 | 9,950 |
142.71 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of options outstanding | $ / shares | $ 142.71 | $ 142.71 |
Number of share options outstanding in share-based payment arrangement | Share | 4,974 | 4,975 |
Weighted average remaining contractual life of outstanding share options | 3 years 8 months 26 days | 4 years 8 months 26 days |
Exercise price of exercisable Share options | $ / shares | $ 142.71 | $ 142.71 |
Number of share options exercisable in share-based payment arrangement | Share | 4,975 | 1,658 |
148.74 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Exercise price of options outstanding | $ / shares |  | $ 148.74 |
Number of share options outstanding in share-based payment arrangement | Share |  | 199,004 |
Weighted average remaining contractual life of outstanding share options |  | 4 years 8 months 12 days |
Exercise price of exercisable Share options | $ / shares |  | $ 148.74 |
Number of share options exercisable in share-based payment arrangement | Share |  | 0 |

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