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Share based compensation - Activities of options (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2024 $ / shares shares | Dec. 31, 2023 USD ($) $ / shares shares | Jul. 31, 2021 $ / shares | Dec. 31, 2024 $ / shares shares | Dec. 31, 2024 CNY (¥) shares | Dec. 31, 2022 CNY (¥)
Weighted remaining contractual years |  |  |  |  |  |
Oustanding |  |  |  | 7 years 6 months 18 days |  |
PSU |  |  |  |  |  |
Number of options |  |  |  |  |  |
Outstanding at the beginning (in shares) | shares |  |  |  |  |  |
Granted (in shares) | shares |  |  |  | 2,000,000 |  |
Vested (in shares) | shares |  |  |  | 0 |  |
Forfeited (in shares) | shares |  |  |  | 0 |  |
Outstanding at the end (in shares) | shares | 2,000,000 |  |  | 2,000,000 |  |
Vested and expected to vest (in shares) | shares |  |  |  |  | 2,000,000 |
Weighted Average Fair value at grant date |  |  |  |  |  |
Outstanding at the beginning (in USD per share) |  |  |  |  |  |
Granted (in USD per share) |  |  |  | 1.69 |  |
Vested (in USD per Share) |  |  |  | 0 |  |
Forfeited (in USD per share) |  |  |  | 0 |  |
Outstanding at the end (in USD per share) | $ 1.69 |  |  | 1.69 |  |
Vested and expected to vest (in USD per share) | $ 1.69 |  |  | $ 1.69 |  |
2021 Option Plan |  |  |  |  |  |
Number of options |  |  |  |  |  |
Outstanding at the beginning (in shares) | shares |  |  |  | 11,260,718 |  |
Granted (in shares) | shares | 246,724 | 93,904 |  | 5,821,580 |  |
Forfeited (in shares) | shares |  |  |  | (950,819) |  |
Exercised (in shares) | shares |  |  |  | (196,423) |  |
Outstanding at the end (in shares) | shares | 15,935,056 | 11,260,718 |  | 15,935,056 |  |
Exercisable (in shares) | shares |  |  |  |  | 11,638,041,000 |
Weighted Average Exercise Price |  |  |  |  |  |
Outstanding at the beginning (in USD per share) |  |  |  | $ 9.62 |  |
Granted (in dollars per share) |  |  | $ 9.70 | 0.50 |  |
Forfeited (in USD per share) |  |  |  | 5.40 |  |
Exercised (in USD per share) |  |  |  | 0.50 |  |
Outstanding at the end (in USD per share) | $ 6.65 | $ 9.62 |  | 6.65 |  |
Exercisable (in USD per share) | 8.26 |  |  | 8.26 |  |
Weighted Average Fair value at grant date |  |  |  |  |  |
Outstanding at the beginning (in USD per share) |  |  |  | 3.11 |  |
Granted (in USD per share) |  |  |  | 1.24 |  |
Forfeited (in USD per share) |  |  |  | 1.35 |  |
Exercised ( in USD per share) |  |  |  | 1.19 |  |
Outstanding at the end (in USD per share) | 2.57 | $ 3.11 |  | 2.57 |  |
Exercisable (in USD per share) | $ 2.70 |  |  | $ 2.70 |  |
Weighted remaining contractual years |  |  |  |  |  |
Exercisable |  |  |  | 7 years 1 month 17 days |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value |  | $ 0 |  |  | ¥ 982 | ¥ 0

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- Definition Weighted average grant-date fair value of options exercisable. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of options vested and expected to vest. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(02) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(03) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Gross number of share options (or share units) granted during 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 (c)(1)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(02) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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