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Share-based compensation - Assumptions used to value the fair value of each option granted (Details)	12 Months Ended
	Dec. 31, 2023 ¥ / shares	Dec. 31, 2022 ¥ / shares	Dec. 31, 2021 ¥ / shares	Dec. 31, 2023 $ / shares	Dec. 31, 2022 $ / shares	Dec. 31, 2021 $ / shares
Assumptions used to value the fair value of each option granted
Exercise price | (per share)			¥ 0.70			$ 0.11
Fair value of the ordinary shares on the date of option grant | (per share)			¥ 1.31			$ 0.20
Risk-free interest rate			3.09%
Risk-free interest rate, minimum	2.64%	2.70%
Risk-free interest rate, maximum	3.84%	2.88%
Contractual life	10 years	10 years	10 years
Expected forfeiture rate (post-vesting)	16.00%	16.00%	16.00%
Exercise multiples	2.8	2.8	2.8
Expected volatility			32.00%
Expected volatility, minimum	30.09%	29.77%
Expected volatility, maximum	30.41%	30.16%
Minimum
Assumptions used to value the fair value of each option granted
Exercise price | (per share)	¥ 0.00	¥ 0.00		$ 0.00	$ 0.00
Fair value of the ordinary shares on the date of option grant | (per share)	2.04	1.35		0.30	0.19
Maximum
Assumptions used to value the fair value of each option granted
Exercise price | (per share)	1.80	1.80		0.25	0.26
Fair value of the ordinary shares on the date of option grant | (per share)	¥ 3.10	¥ 1.40		$ 0.43	$ 0.21

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Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(ii)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iv)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

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The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.

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Price of a single share of a number of saleable stocks of a company.

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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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The exercise multiples assumption that is used in valuing an option.

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Expected forfeiture rate (post-vesting).

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