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Share-based compensation - Assumptions used to value the fair value of each option granted (Details) | 12 Months Ended |  |  |
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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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- Definition Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award. + References No definition available. + Details
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- Definition 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 + Details
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- Definition 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. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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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 + Details
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- Definition The maximum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition The minimum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition Price of a single share of a number of saleable stocks of a company. + References No definition available. + Details
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- Definition 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 + Details
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- Definition The exercise multiples assumption that is used in valuing an option. + References No definition available. + Details
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- Definition Expected forfeiture rate (post-vesting). + References No definition available. + Details
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