Share-based compensation - Summary of Restricted Share Units Activity (Details) - 2011 Incentive Scheme - Restricted share units - $ / shares	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Number of restricted shares
Outstanding at the beginning of the period (in shares)	16,134,095	14,532,971	17,535,567
Granted (in shares)	15,895,447	10,968,657	7,744,374
Forfeited (in shares)	(2,361,856)	(2,047,879)	(2,688,963)
Vested (in shares)	(7,237,585)	(7,319,654)	(8,058,007)
Outstanding at the end of the period (in shares)	22,430,101	16,134,095	14,532,971
Expected to vest at the end of the period (in shares)	19,160,592
Weighted average grant-date fair value
Outstanding at the beginning of the period (in dollars per share)	$ 1.7834	$ 2.0776	$ 2.5551
Granted (in dollars per share)	2.6261	1.7669	1.7842
Forfeited (in dollars per share)	2.0989	1.9403	2.1666
Vested (in dollars per share)	1.8973	2.3032	2.8052
Outstanding at the end of the period (in dollars per share)	2.3106	$ 1.7834	$ 2.0776
Expected to vest at the end of the period (in dollars per share)	$ 2.2921

As of the balance sheet date, the weighted-average exercise price for awards that are expected to vest.

No definition available.

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- Definition

As of the balance sheet date, the number of shares into which expected to vest stock options outstanding can be converted under the option plan.

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No definition available.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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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.

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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).

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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).

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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 as of the balance sheet date.

+ 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)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(ii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480429/718-10-50-2

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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 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.

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