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Share-based compensation - Restricted Share Units (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Restricted shares |  |  |  |
Total share-based compensation expense | $ 9,202 | $ 7,430 | $ 27,748 | $ 24,665
Restricted share units | 2020 Plan |  |  |  |
Number of Shares Underlying RSUs |  |  |  |
Unvested restricted ordinary shares at beginning |  |  | 326,848 |
Granted |  |  | 615,496 |
Vested and settled |  |  | (114,799) |
Vested and deferred |  |  | (31,500) |
Forfeited |  |  | (15,119) |
Unvested restricted ordinary shares at ending | 780,926 |  | 780,926 |
Unvested restricted ordinary shares, Vested but subject to deferred settlement |  |  | 31,500 |
Outstanding ordinary shares at ending | 812,426 |  | 812,426 |
Weighted Average Grant Date Fair Value |  |  |  |
Weighted average grant date fair value unvested, Beginning Balance |  |  | $ 37.40 |
Granted |  |  | 18.25 |
Vested and settled |  |  | 37.31 |
Vested and deferred |  |  | 18.07 |
Forfeited |  |  | 18.89 |
Weighted average grant date fair value unvested, Ending Balance | $ 23.46 |  | 23.46 |
Weighted average grant date fair value, Vested but subject to deferred settlement |  |  | 18.07 |
Weighted average grant date fair value unvested, Ending Balance | $ 23.25 |  | $ 23.25 |
Restricted shares |  |  |  |
Fair value of employee restricted share awards vested | $ 800 | 500 | $ 3,000 | 2,600
Total share-based compensation expense | 1,800 | $ 1,200 | 5,500 | $ 4,200
Unrecognized compensation cost | $ 15,400 |  | $ 15,400 |
Weighted average Period |  |  | 2 years 7 months 6 days |

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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested and deferred during the reporting period. + References No definition available. + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee vested and deferred during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References No definition available. + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee vested and settled during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References No definition available. + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right, subject to deferred settlement during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References No definition available. + Details
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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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