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v3.25.1

Treasury shares (Details) |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 11, 2022 USD ($) $ / shares | Jan. 16, 2020 USD ($) $ / shares | Dec. 31, 2024 CNY (¥) shares | Dec. 31, 2024 USD ($) $ / shares shares | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2020 CNY (¥) shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2024 USD ($) $ / shares | Dec. 31, 2023 $ / shares | Dec. 31, 2023 CNY (¥)
Treasury shares |  |  |  |  |  |  |  |  |  |  |
Treasury stock amount | ¥ |  |  | ¥ 528,393,708 |  | ¥ 420,660,053 | ¥ 145,866,006 |  |  |  |  |
Treasury stock, value |  |  | ¥ 1,419,285,878 |  |  | ¥ 486,954,953 |  |  | $ 194,441,368 |  | ¥ 899,627,520
Cancelled shares |  |  | 71,645,824 | 71,645,824 |  |  |  |  |  |  |
Exercise of stock options |  |  | 1,583,088 | 1,583,088 |  |  |  |  |  |  |
Remaining balance of treasury shares |  |  | ¥ 1,419,285,878 |  |  |  |  |  | $ 194,441,368 |  |
Class A ordinary shares |  |  |  |  |  |  |  |  |  |  |
Treasury shares |  |  |  |  |  |  |  |  |  |  |
Remaining balance of treasury shares |  |  | 96,106,868 | 96,106,868 |  |  |  |  |  |  |
Number of underlying shares represented by one ADS |  |  | 1 |  |  | 1 |  |  | 1 |  | 1
Common stock, par value | $ / shares |  |  |  |  |  |  |  |  | $ 0.0001 | $ 0.0001 |
American Depositary Shares |  |  |  |  |  |  |  |  |  |  |
Treasury shares |  |  |  |  |  |  |  |  |  |  |
Repurchased shares, average price | $ / shares |  |  |  | $ 2.0232 |  |  |  |  |  |  |
Share Repurchase Program 2020 |  |  |  |  |  |  |  |  |  |  |
Treasury shares |  |  |  |  |  |  |  |  |  |  |
Treasury stock amount |  |  |  |  |  |  | ¥ 15,528,092 | $ 2,258,112 |  |  |
Period |  | 24 months |  |  |  |  |  |  |  |  |
Share Repurchase Program 2020 | Class A ordinary shares |  |  |  |  |  |  |  |  |  |  |
Treasury shares |  |  |  |  |  |  |  |  |  |  |
Number of shares repurchased |  |  |  |  |  |  | 1,495,291 | 1,495,291 |  |  |
Number of underlying shares represented by one ADS |  | 1 |  |  |  |  |  |  |  |  |
Common stock, par value | $ / shares |  | $ 0.0001 |  |  |  |  |  |  |  |  |
Share Repurchase Program 2020 | American Depositary Shares |  |  |  |  |  |  |  |  |  |  |
Treasury shares |  |  |  |  |  |  |  |  |  |  |
Authorized share to be repurchased, maximum aggregate value | $ |  | $ 400,000,000 |  |  |  |  |  |  |  |  |
Number of shares repurchased |  |  |  |  |  |  | 1,495,291 | 1,495,291 |  |  |
Repurchased shares, average price | $ / shares |  |  |  |  |  |  |  | $ 1.51 |  |  |
Share Repurchase Program 2022 |  |  |  |  |  |  |  |  |  |  |
Treasury shares |  |  |  |  |  |  |  |  |  |  |
Treasury stock amount |  |  | ¥ 5,311,340,628 | $ 727,650,683 |  |  |  |  |  |  |
Period | 24 months |  |  |  |  |  |  |  |  |  |
Share Repurchase Program 2022 | Class A ordinary shares |  |  |  |  |  |  |  |  |  |  |
Treasury shares |  |  |  |  |  |  |  |  |  |  |
Number of shares repurchased |  |  | 169,335,780 | 169,335,780 |  |  |  |  |  |  |
Number of underlying shares represented by one ADS | 1 |  |  |  |  |  |  |  |  |  |
Common stock, par value | $ / shares | $ 0.0001 |  |  |  |  |  |  |  |  |  |
Share Repurchase Program 2022 | American Depositary Shares |  |  |  |  |  |  |  |  |  |  |
Treasury shares |  |  |  |  |  |  |  |  |  |  |
Authorized share to be repurchased, maximum aggregate value | $ | $ 200,000,000 |  |  |  |  |  |  |  |  |  |
Number of shares repurchased |  |  | 169,335,780 | 169,335,780 |  |  |  |  |  |  |
Repurchased shares, average price | $ / shares |  |  |  | $ 4.2971 |  |  |  |  |  |  |

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- Definition The number of underlying shares represented by one American Depository Receipt (ADR) or Global Depository Receipt (GDR). A value of '3' means that one ADR represents 3 underlying shares. If one underlying share represents 2 ADR's then the value would be represented as '0.5'. + References No definition available. + Details
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- Definition Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 505 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481520/505-30-50-4 + Details
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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Period share may be purchased under authorized share repurchase plan, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, repurchase of stock and unit of ownership. + References No definition available. + Details
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