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Share-based payments - Summary of Employee Share Options (Detail) |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 17, 2020 $ / shares | Sep. 14, 2020 shares $ / shares | Jul. 01, 2020 $ / shares | Jun. 30, 2020 shares $ / shares | Dec. 31, 2020 shares $ / shares | Dec. 31, 2019 shares $ / shares | Dec. 31, 2018 shares $ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Weighted average exercise price, Outstanding at January 1, |  |  |  |  | $ 17.45 | $ 16.65 | $ 16.65
SARs forfeited |  |  |  |  |  | 16.81 | 16.65
Weighted average exercise price, Outstanding at December 31, |  |  |  |  |  | $ 17.45 | $ 16.65
Number of share options, outstanding at January 1, | shares |  |  |  |  | 103,469 | 74,401 | 31,880
SARs forfeited | shares |  |  |  |  |  | 2,936 | 1,443
Number of share options, outstanding at December 31, | shares |  |  |  |  |  | 103,469 | 74,401
Weighted average remaining contract life (years) |  |  |  |  |  | 8 years 6 months 21 days | 9 years 1 month 13 days
Weighted average fair value of options granted |  |  | $ 13.79 |  |  |  |
Granted On December 2020 [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
SARs granted |  |  |  |  |  | $ 23.82 |
SARs granted | shares |  |  |  |  |  | 5,447 |
Share Appreciation Rights [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
Weighted average exercise price, Outstanding at January 1, |  |  |  |  | $ 1.12 | $ 1.12 | $ 1.12
SARs forfeited |  |  |  |  |  | 1.12 | 1.12
Weighted average exercise price, Outstanding at December 31, |  |  |  |  |  | 1.12 | 1.12
SARs vested |  |  |  |  |  | $ 1.12 | $ 1.12
Number of share options, outstanding at January 1, | shares |  |  |  |  | 43,455 | 43,675 | 43,978
SARs forfeited | shares |  |  |  |  |  | 220 | 303
Number of share options, outstanding at December 31, | shares |  |  |  |  |  | 43,455 | 43,675
SARs vested | shares |  |  |  |  |  | 117 | 169
Performance Based Options [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
SARs forfeited |  |  |  |  | $ 10.00 |  |
Weighted average exercise price, Outstanding at December 31, |  |  |  |  | $ 10.00 |  |
SARs forfeited | shares |  |  |  |  | 255,000 |  |
Number of share options, outstanding at December 31, | shares |  |  |  |  | 3,644,000 |  |
Weighted average remaining contract life (years) |  |  |  |  | 9 years 7 months 6 days |  |
Performance Based Options [Member] | Granted On June 2020 [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
SARs granted |  |  |  |  | $ 10.00 |  |
SARs granted | shares |  |  |  | 3,644,000 | 3,644,000 |  |
Weighted average fair value of options granted |  |  |  | $ 11.10 | $ 11.10 |  |
Performance Based Options [Member] | Granted On September 2020 [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
SARs granted |  |  |  |  | $ 10.00 |  |
SARs granted | shares |  | 255,000 |  |  | 255,000 |  |
Weighted average fair value of options granted |  | $ 6.41 |  |  | $ 6.41 |  |
Additional Grants Under 2020 Plan [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
SARs forfeited |  |  |  |  | 10.00 |  |
Weighted average exercise price, Outstanding at December 31, |  |  |  |  | $ 9.87 |  |
SARs granted | shares |  |  |  |  | 1,963,566 |  |
SARs forfeited | shares |  |  |  |  | 53,384 |  |
Number of share options, outstanding at December 31, | shares |  |  |  |  | 1,910,182 |  |
Weighted average remaining contract life (years) |  |  |  |  | 9 years 8 months 19 days |  |
Additional Grants Under 2020 Plan [Member] | Granted On June 2020 [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
SARs granted |  |  |  |  | $ 10.00 |  |
SARs granted | shares |  |  |  |  | 1,087,417 |  |
Weighted average fair value of options granted |  |  |  | $ 11.29 | $ 11.29 |  |
Additional Grants Under 2020 Plan [Member] | Granted On September 2020 [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
SARs granted |  |  |  |  | $ 9.72 |  |
SARs granted | shares |  |  |  |  | 74,000 |  |
Weighted average fair value of options granted |  | $ 9.25 |  |  | $ 9.25 |  |
Additional Grants Under 2020 Plan [Member] | Granted On December 2020 [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
SARs granted |  |  |  |  | $ 9.70 |  |
SARs granted | shares |  |  |  |  | 802,149 |  |
Weighted average fair value of options granted | $ 6.73 |  |  |  | $ 6.73 |  |
Converted Options [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
SARs forfeited |  |  |  |  | 1.08 |  |
Weighted average exercise price, Outstanding at December 31, |  |  |  |  | 2.58 |  |
SARs vested |  |  |  |  | $ 2.45 |  |
SARs forfeited | shares |  |  |  |  | 37,540 |  |
Number of share options, outstanding at December 31, | shares |  |  |  |  | 594,844 |  |
SARs vested | shares |  |  |  |  | 53,856 |  |
Weighted average remaining contract life (years) |  |  |  |  | 7 years 3 days |  |
Weighted average fair value of options granted |  |  |  |  | $ 4.83 |  |
Converted Options [Member] | Granted On June 2020 [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
SARs granted |  |  |  |  | $ 2.49 |  |
SARs granted | shares |  |  |  |  | 632,384 |  |
Matching Stock Options [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
SARs forfeited |  |  |  |  | $ 10.00 |  |
Weighted average exercise price, Outstanding at December 31, |  |  |  |  | $ 10.00 |  |
SARs forfeited | shares |  |  |  |  | 8,262 |  |
Number of share options, outstanding at December 31, | shares |  |  |  |  | 1,422,556 |  |
Weighted average remaining contract life (years) |  |  |  |  | 9 years 6 months |  |
Matching Stock Options [Member] | Granted On June 2020 [Member] |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |  |  |
SARs granted |  |  |  |  | $ 10.00 |  |
SARs granted | shares |  |  |  |  | 1,430,818 |  |
Weighted average fair value of options granted |  |  |  |  | $ 10.59 |  |

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