Income taxes - Additional Information (Details) ¥ in Thousands, $ in Thousands	6 Months Ended
Jun. 30, 2026 CNY (¥)	Jun. 30, 2026 USD ($)	Jun. 30, 2025 CNY (¥)
Income taxes
Income tax expense (benefit)	¥ 62	$ 9	¥ (546)
Effective tax rate	1.88%	1.88%	32.93%
Interest and penalties related to an uncertain tax position	¥ 0		¥ 0
China
Income taxes
Effective statutory enterprise income tax rate	25.00%	25.00%
Effective preferential income tax rate	15.00%	15.00%
Hong Kong
Income taxes
Effective statutory enterprise income tax rate	16.50%	16.50%
Singapore
Income taxes
Effective statutory enterprise income tax rate	17.00%	17.00%
Malaysia
Income taxes
Effective statutory enterprise income tax rate	24.00%	24.00%

Effective preferential income tax rate.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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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.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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