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Share-based compensation (Tables) | 12 Months Ended
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Dec. 31, 2024
Share-based compensation |
Summary of share option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ | ​ |  | ​ |  | Weighted |  | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | average | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | remaining | ​ | Aggregated
​ | ​ | ​ |  | Weighted average | ​ | Weighted average | ​ | contractual | ​ | intrinsic
​ | ​ | Number of options | ​ | exercise price | ​ | grant date fair value | ​ | term | ​ | value
​ | ​ | ​ | ​ | RMB | ​ | RMB | ​ | Years | ​ | RMB
Balance, December 31, 2022 | ​ | 9,461,786 | ​ | — | ​ | 17.26 | ​ | 5.31 | ​ | 61,990,313
Exercised | ​ | (274,925) | ​ | — | ​ | 11.12 | ​ | — | ​ | 3,601,562
Forfeited | ​ | (12,500) | ​ | — | ​ | 19.86 | ​ | — | ​ | —
Balance, December 31, 2023 |  | 9,174,361 |  | — |  | 17.44 |  | 4.32 |  | 132,873,059
Exercised |  | (254,326) |  | — |  | 28.02 |  | 2.93 |  | 3,938,396
Forfeited |  | — |  | — |  | — |  | — |  | —
Balance, December 31, 2024 |  | 8,920,035 |  | — |  | 33.17 |  | 3.42 |  | 183,603,721
Vested and Exercisable as of December 31, 2024 |  | 8,920,035 |  | — |  | 33.17 |  | 3.42 |  | 183,603,721
Summary of allocated share-based compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the years ended December 31,
​ | ​ | 2022 | ​ | 2023 | ​ | 2024
​ |  | RMB |  | RMB |  | RMB |  | US$
Sales and marketing | ​ | 527,537 | ​ | 265,862 | ​ | 299,806 | ​ | 41,073
General and administrative | ​ | 21,102,104 | ​ | 4,649,664 | ​ | 1,754,168 | ​ | 240,320
Research and development | ​ | 2,424,119 | ​ | 20,256 | ​ | 203,821 | ​ | 27,924
​ | ​ | 24,053,760 | ​ | 4,935,782 | ​ | 2,257,795 | ​ | 309,317
​

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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