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Income Taxes - Additional information (Details) ¥ in Thousands, $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Apr. 01, 2018 HKD ($) | Dec. 31, 2024 CNY (¥) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 CNY (¥)
Income Taxes |  |  |  |
Net operating loss carry forward |  | ¥ 2,147,186 | ¥ 2,264,010 |
Withholding income tax |  | 10.00% |  |
Unrecognized tax benefits |  | ¥ 0 | ¥ 0 | ¥ 0
Unrecognized tax benefits, interest on income taxes expense |  | 0 |  |
Unrecognized tax benefits, income tax penalties expense |  | ¥ 0 |  |
Investor holds at least 25% in the FIE |  |  |  |
Income Taxes |  |  |  |
Statutory income tax rate |  | 5.00% |  |
Investor holds less than 25% in the FIE |  |  |  |
Income Taxes |  |  |  |
Statutory income tax rate |  | 10.00% |  |
HONG KONG |  |  |  |
Income Taxes |  |  |  |
Profits earned, under which the tax rate is 8.25% | $ | $ 2 |  |  |
Tax rate on assessable profits on first HK$2 million | 8.25% |  |  |
Statutory income tax rate |  | 16.50% |  |
Preferential tax rate |  | 15 |  |
CHINA |  |  |  |
Income Taxes |  |  |  |
Statutory income tax rate |  | 25.00% |  |
CHINA | High and new technology enterprises |  |  |  |
Income Taxes |  |  |  |
Statutory income tax rate |  | 15.00% | 15.00% |
Preferential tax rate |  | 15 |  |
CHINA | Small enterprises with low profits |  |  |  |
Income Taxes |  |  |  |
Preferential tax rate |  | 20 | 20 |
CHINA | VIE |  |  |  |
Income Taxes |  |  |  |
Statutory income tax rate |  | 25.00% |  |

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-12 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 231 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-231 + Details
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-3 + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 217 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-217 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-15A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10B -Publisher FASB -URI https://asc.fasb.org/1943274/2147482525/740-10-45-10B + Details
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- Definition Amount of expense for penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-15 + Details
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