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Share based compensation - Narrative (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands	1 Months Ended		6 Months Ended
	Apr. 30, 2024 shares	Feb. 29, 2024 shares	Jun. 30, 2024 CNY (¥) $ / shares shares	Jun. 30, 2023	Jun. 30, 2024 USD ($)
Share based compensation
Nonvested (in shares) | ¥			¥ 22,449
Weighted-average period			1 year 2 months 12 days
Share Incentive Plan, 2022
Share based compensation
Aggregate number of share options granted (in shares)	4,960,570
Service period	12 months
Share Incentive Plan, 2022 | After the completion of a qualified IPO
Share based compensation
Vesting percentage	25.00%
Share Incentive Plan, 2022 | RSU
Share based compensation
Shares vested (in shares)		117,250
Aggregate number of shares granted (in shares)		117,250
2021 Option Plan
Share based compensation
Aggregate number of share options granted (in shares)			4,960,570,000
Exercise price per share (in USD per share) | $ / shares			¥ 0.50
Expected dividend yield			0.00%	0.00%
Total unrecognized compensation expense			¥ 66,196		$ 9,290

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Gross number of share options (or share units) granted during the period.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Intrinsic value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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