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Share based compensation - Additional Information (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands |  |  |  |  |  | 1 Months Ended | 5 Months Ended | 9 Months Ended | 11 Months Ended | 12 Months Ended |
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Oct. 31, 2022 USD ($) shares | Oct. 31, 2022 CNY (¥) shares | Aug. 20, 2022 USD ($) shares | Aug. 20, 2022 CNY (¥) shares | Jan. 30, 2022 | Jan. 20, 2022 $ / shares | Mar. 31, 2021 | Jan. 31, 2022 | Jul. 31, 2021 $ / shares | Mar. 31, 2021 $ / shares | Dec. 31, 2021 shares | Dec. 31, 2020 $ / shares shares | Sep. 30, 2022 $ / shares shares | Nov. 30, 2021 $ / shares shares | Nov. 30, 2022 shares | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2022 CNY (¥) shares | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2021 CNY (¥) shares | Dec. 31, 2020 CNY (¥) shares | Dec. 31, 2019 shares | Dec. 31, 2022 CNY (¥) shares
Share based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of unvested awards |  |  |  |  |  |  |  |  |  |  | 18,995,595 | 16,224,217 |  |  |  | 24,431,761 |  | 18,995,595 | 18,995,595 | 16,224,217 |  | 24,431,761
RSU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total compensation expense recognized | ¥ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 524,553 |  | ¥ 163,481 | ¥ 11,410 |  |
Expected dividend yield |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% |  |
Share-based expenses due to redesignation | ¥ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 0 |  | ¥ 16,452 | ¥ 0 |  |
Total unrecognized compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 31,628 |  |  |  |  |  | ¥ 209,898
Weighted-average period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year 10 months 24 days | 1 year 10 months 24 days |  |  |  |  |
RSU | Tranche one |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% | 50.00% |  |  |  |  |
Service period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years | 5 years |  |  |  |  |
RSU | Tranche one | Upon a qualified IPO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% | 50.00% |  |  |  |  |
RSU | Tranche two | Upon a qualified IPO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% | 20.00% |  |  |  |  |
Service period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 months | 12 months |  |  |  |  |
RSU | Tranche two | Before a qualified IPO is achieved |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% | 50.00% |  |  |  |  |
Service period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years | 5 years |  |  |  |  |
RSU | Tranche two | After the completion of a qualified IPO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% | 20.00% |  |  |  |  |
Service period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 months | 12 months |  |  |  |  |
RSU | Tranche three |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 60 months | 60 months |  |  |  |  |
RSU | Vesting upon the completion of Merger with COVA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total compensation expense recognized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 19,505 | ¥ 129,444 |  |  |  |  |
2019 RSU Plan | RSU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares transferred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,859,142 |
Percent of total outstanding shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |
Aggregate number of shares granted |  |  |  |  |  |  |  |  |  |  |  |  | 6,680,560 |  |  |  |  |  |  |  |  |
Weighted average exercise price | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.56 |  |  |  |  |  |  |  |  |
2019 RSU Plan | RSU | Employee and non employee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate number of shares granted |  |  |  |  |  |  |  |  |  |  |  | 16,224,217 |  |  |  |  |  |  |  |  |  |
Weighted average exercise price | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 0.34 |  |  |  |  |  |  |  |  |  |
2019 RSU Plan | RSU | Share-based payment arrangement employee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate number of shares granted | 4,771,828 | 4,771,828 |  |  |  |  |  |  |  |  |  |  |  | 2,890,674 |  |  |  |  |  |  |  |
Weighted average exercise price | $ / shares |  |  |  |  |  | $ 0.32 |  |  |  | $ 2.96 |  |  |  | $ 1.23 |  |  |  |  |  |  |  |
Service period |  |  |  |  |  |  |  | 12 months |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of awards modified |  |  | 1,431,549 | 1,431,549 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental compensation cost to be recorded |  |  | $ 2,999 | ¥ 19,904 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period to record incremental compensation cost |  |  |  |  | 3 years 6 months |  | 3 years 3 months 18 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of unvested awards | 1,988,262 | 1,988,262 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period | 30 months | 30 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Incremental compensation cost recognized immediately for the vested RSUs | $ 17,993 | ¥ 119,408 | $ 750 | ¥ 4,976 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 RSU Plan | RSU | Share-based payment arrangement employee | Vest every twelve-month service period since the service commencement of the employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 RSU Plan | RSU | Share-based payment arrangement employee | Vest on April 1, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
2019 RSU Plan | RSU | Share-based payment arrangement employee | Vest on a monthly basis over thirty-six (36) months from May 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
2021 Option Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total compensation expense recognized | ¥ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 201,098 |  |  |  |  |
Aggregate number of share options granted |  |  |  |  |  |  |  |  |  |  | 13,575,733 |  |  |  |  | 2,354,744 | 2,354,744 | 13,575,733 | 13,575,733 |  |  |
Expected dividend yield |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00% | 0.00% | 0.00% | 0.00% |  |  |
Weighted-average period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years 9 months | 2 years 9 months |  |  |  |  |
Exercise price per share | $ / shares |  |  |  |  |  |  |  |  | $ 9.70 |  |  |  |  |  |  | $ 9.70 |  | $ 9.70 |  |  |  |
2021 Option Plan | Upon a qualified IPO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |
Service period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 months |  |  |  |  |  |  |
2021 Option Plan | After the completion of a qualified IPO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |
Service period |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 months |  |  |  |  |  |  |
2021 Option Plan | Vesting upon the completion of Merger with COVA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares vested |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,818,048 | 6,818,048 |  |  |  |  |
Total compensation expense recognized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30,384 | ¥ 201,645 |  |  |  |  |
2021 Option Plan | Share-based payment arrangement employee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate number of share options granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,354,744 |  |  |  |  |  |  |
2021 Option Plan | RSU |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares vested |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,101,085 | 5,101,085 |  |  |
Total compensation expense recognized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 16,311 | ¥ 105,211 |  |  |
Remaining portion of awards to be vested over the service period following the modified vesting schedule |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,607,277 | 2,607,277 |  |  |

X
- Definition The number of equity-based payment instruments, excluding stock (or unit) options, to be vested over the service period following the modified vesting schedule. + References No definition available. + Details
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- Definition Number of shares transferred under share-based payment arrangement. + References No definition available. + Details
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- Definition An excess of the fair value of the modified award over the fair value of the award immediately before the modification, to be recorded. + References No definition available. + Details
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- Definition Number of awards affected by plan modifications under share-based payment arrangement. + References No definition available. + Details
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- Definition Period to record incremental compensation cost on awards modified under share-based payment arrangement. + References No definition available. + Details
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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Amount of additional cost recognized for award under share-based payment arrangement from occurrence of event accelerating recognition of cost. + References No definition available. + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(02) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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