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Income tax - Composition of loss before tax (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income tax
Loss from Mainland China operations	¥ (330,426)	¥ (717,979)	¥ (1,095,499)
Income/(loss) from overseas operations	25,721	(13,613)	1,587
Total loss before income tax	¥ (304,705)	¥ (731,592)	¥ (1,093,912)

X

- Definition

The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

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