Leases - Supplemental lease cash flow (Details) |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2025
CNY (¥)
|
Dec. 31, 2025
USD ($)
|
Dec. 31, 2024
CNY (¥)
|
|
| Leases | |||
| Cash payments for operating leases | ¥ 13,668,558 | $ 1,954,578 | ¥ 30,645,878 |
| Operating ROU assets released in exchange for operating lease liabilities | 51,317,359 | 7,338,285 | 24,904,133 |
| Operating ROU assets obtained in exchange for new operating lease liabilities | ¥ 2,054,335 | $ 293,766 | ¥ 51,284,880 |