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Share-based payments - Summary of Activities Under Share Based Payment Arrangement (Detail) | 12 Months Ended
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Dec. 31, 2019 shares $ / shares | Dec. 31, 2018 shares $ / shares
Statements [Line Items] |  |
Weighted average exercise price, Outstanding at January 1, | $ 16.65 | $ 16.65
Weighted average exercise price, Tandem awards forfeited | 16.81 | 16.65
Weighted average exercise price, Outstanding at December 31, | 17.45 | 16.65
Weighted average exercise price, Tandem awards vested | $ 16.76 | $ 16.65
Weighted average remaining contract life (years) | 8 years 6 months 21 days | 9 years 1 month 13 days
Number of share options, outstanding at January 1, | shares | 74,401 | 31,880
Number of share options, Tandem awards forfeited | shares | 2,936 | 1,443
Number of share options, outstanding at December 31, | shares | 103,469 | 74,401
Number of share options, Tandem awards vested | shares | 16,238 | 14,350
Granted On June 2020 [Member] |  |
Statements [Line Items] |  |
Weighted average exercise price, Tandem awards granted | $ 18.30 | $ 16.65
Number of share options, Tandem awards granted | shares | 26,557 | 43,964
Granted On December 2020 [Member] |  |
Statements [Line Items] |  |
Weighted average exercise price, Tandem awards granted | $ 23.82 |
Weighted average fair value of options granted | $ 53.41 |
Number of share options, Tandem awards granted | shares | 5,447 |
Granted On September 2020 [Member] |  |
Statements [Line Items] |  |
Weighted average fair value of options granted | $ 10.27 | $ 4.51

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