Basic and diluted loss per share - Effects of Dilutive Securities Excluded From Computation of Diluted Loss Per Share Due to Anti-Dilutive Effect (Details) - shares	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
RSUs
Basic and diluted loss per share calculation
Weighted-average of shares	551,294,295	569,945,385	146,954,430
Share options
Basic and diluted loss per share calculation
Weighted-average of shares	60,000,000	60,000,000	144,000,000
Convertible Preferred Shares
Basic and diluted loss per share calculation
Weighted-average of shares	0	417,588,975	0

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 260
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482662/260-10-50-1

Name:	us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration