Net income per share and net income attributable to common stockholders - Anti-dilutive shares (Details) - shares	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Share options
Anti-dilutive shares
Anti-dilutive shares not included in the computation of diluted income per share	502,014	3,399,998	3,602,998
Restricted stock units
Anti-dilutive shares
Anti-dilutive shares not included in the computation of diluted income per share	864,158	6,585,270	12,613,046

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

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