OPERATING LEASES - Supplemental information related to operating leases (Details) |
12 Months Ended | |||
|---|---|---|---|---|
|
Dec. 31, 2025
CNY (¥)
|
Dec. 31, 2024
CNY (¥)
|
Dec. 31, 2023
CNY (¥)
|
Dec. 31, 2025
USD ($)
|
|
| OPERATING LEASES | ||||
| Operating lease right-of-use assets | ¥ 75,954,225 | ¥ 71,223,350 | $ 10,861,310 | |
| Operating lease liabilities-current (Note 10) | ¥ 3,187,599 | ¥ 1,253,020 | ||
| Operating lease liabilities-current, financial statement location | Accrued expenses and other current liabilities (including accrued expenses and other current liabilities of VIE without recourse to the Company of RMB192,470,955 and RMB382,533,451 as of December 31, 2024 and 2025, respectively) | Accrued expenses and other current liabilities (including accrued expenses and other current liabilities of VIE without recourse to the Company of RMB192,470,955 and RMB382,533,451 as of December 31, 2024 and 2025, respectively) | Accrued expenses and other current liabilities (including accrued expenses and other current liabilities of VIE without recourse to the Company of RMB192,470,955 and RMB382,533,451 as of December 31, 2024 and 2025, respectively) | |
| Operating lease liabilities-non-current | ¥ 3,956,501 | ¥ 89,990 | $ 565,772 | |
| Total operating lease liabilities | 7,144,100 | 1,343,010 | ||
| Cash paid for amounts included in the measurement of operating lease liabilities | 4,119,863 | 5,263,335 | ¥ 7,711,479 | |
| Right-of-use assets obtained in exchange for new operating lease liabilities | ¥ 9,706,409 | ¥ 1,144,700 | 3,744,607 | |
| Modification to right-of-use assets | ¥ (5,217,099) | |||
| Weighted average remaining lease term | 2 years 6 months | 2 years 6 months | ||
| Weighted average discount rate | 3.09% | 3.09% | ||