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OPERATING LEASES - Supplemental information related to operating leases (Details)
 12 Months Ended
Dec. 31, 2023
CNY (¥)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2023
USD ($)
OPERATING LEASES        
Operating lease right-of-use assets ¥ 76,821,285 ¥ 86,597,121   $ 10,820,052
Operating lease liabilities-current (Note 12) ¥ 5,094,066 ¥ 7,743,648    
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 RMB175,352,229 and RMB151,286,008 as of December 31, 2022 and 2023, respectively) Accrued expenses and other current liabilities (including accrued expenses and other current liabilities of VIE without recourse to the Company of RMB175,352,229 and RMB151,286,008 as of December 31, 2022 and 2023, respectively)   Accrued expenses and other current liabilities (including accrued expenses and other current liabilities of VIE without recourse to the Company of RMB175,352,229 and RMB151,286,008 as of December 31, 2022 and 2023, respectively)
Operating lease liabilities-non-current ¥ 280,421 ¥ 7,569,128   $ 39,496
Total operating lease liabilities 5,374,487 15,312,776    
Cash paid for amounts included in the measurement of operating lease liabilities 7,711,479 8,046,828 ¥ 9,569,023  
Right-of-use assets obtained in exchange for new operating lease liabilities 3,744,607 ¥ 921,405 10,201,553  
Right-of-use assets obtained in exchange for prepayment for land use right     26,550,000  
Modification to right-of-use assets ¥ (5,217,099)   ¥ (11,469,923)  
Weighted average remaining lease term 1 year 1 month 6 days     1 year 1 month 6 days
Weighted average discount rate 3.92%     3.92%