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Income Taxes - Composition of income tax (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Composition of income tax
Current income tax expense/(credit)	¥ 64	¥ (42)	¥ 361
Total	¥ 64	¥ (42)	¥ 361

X

- Definition

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

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- Definition

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

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