Condensed financial information of the parent company - Additional Information (Details) - Subsidiaries $ in Thousands	12 Months Ended
Dec. 31, 2025 USD ($)
Condensed Financial Statements Captions [Line Items]
Restricted net assets as percentage of consolidated and unconsolidated subsidiaries	25.00%
Restricted net assets	$ 115,937

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
-Number 210
-Section 12
-Subsection 04
-Paragraph a
-Publisher SEC

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
-Number 210
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-X (SX)
-Number 210
-Section 9
-Subsection 06
-Publisher SEC

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 235
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477314/942-235-S99-2

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-4

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
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-Subparagraph (SX 210.12-04(a))
-Publisher FASB
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Reference 8: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Topic 810
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-Name Accounting Standards Codification
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481231/810-10-45-11

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 205
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 205
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481003/205-10-S50-2

+ Details