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PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION - Condensed Balance Sheets (Details)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
Current assets          
Cash and cash equivalents ¥ 872,573,460 $ 122,899,401 ¥ 534,286,849    
Total term deposits held 97,555,565   228,589,770    
Restricted cash 107,666,733 15,164,542 186,340,321    
Prepayments and other current assets 195,072,129 27,475,335 205,695,717    
Total current assets 1,760,614,198 247,977,323 2,012,071,029    
Non-current assets          
Other non-current assets 6,730,378 947,954 12,683,090    
Total assets 2,189,331,649 308,360,914 2,536,697,854    
Current liabilities          
Accrued expenses and other current liabilities 165,511,396 23,311,795 192,092,943    
Total liabilities 1,095,715,415 154,328,289 1,226,599,977    
Shareholders' equity:          
Additional paid-in capital 1,964,138,365 276,643,103 1,915,825,641    
Accumulated other comprehensive loss (9,495,674) (1,337,438) (16,536,686)    
Accumulated deficit (861,126,804) (121,287,174) (589,290,822)    
Total shareholders' equity 1,093,616,234 154,032,625 1,310,097,877 ¥ 1,264,554,190 ¥ 993,374,244
Total liabilities and shareholders' equity 2,189,331,649 308,360,914 2,536,697,854    
Class A Ordinary Shares          
Shareholders' equity:          
Ordinary shares 90,031 12,681 89,428    
Class B Ordinary Shares          
Shareholders' equity:          
Ordinary shares 10,316 $ 1,453 10,316    
Parent Company | Reportable Legal Entities          
Current assets          
Cash and cash equivalents 233,958,655   12,375,894    
Total term deposits held 77,555,565   208,589,770    
Restricted cash 107,521,733   176,204,380    
Prepayments and other current assets 12,035,145   12,486,238    
Total current assets 431,071,098   409,656,282    
Non-current assets          
Investment in and amount due from subsidiaries, consolidated VIE and VIE's subsidiaries 671,329,320   906,298,879    
Other non-current assets     1,219    
Total assets 1,102,400,418   1,315,956,380    
Current liabilities          
Amount due to subsidiaries, consolidated VIE and VIE's subsidiaries 4,564,315   4,262,270    
Accrued expenses and other current liabilities 4,219,869   1,596,233    
Total liabilities 8,784,184   5,858,503    
Shareholders' equity:          
Additional paid-in capital 1,964,138,365   1,915,825,641    
Accumulated other comprehensive loss (9,495,674)   (16,536,686)    
Accumulated deficit (861,126,804)   (589,290,822)    
Total shareholders' equity 1,093,616,234   1,310,097,877    
Total liabilities and shareholders' equity 1,102,400,418   1,315,956,380    
Parent Company | Reportable Legal Entities | Class A Ordinary Shares          
Shareholders' equity:          
Ordinary shares 90,031   89,428    
Parent Company | Reportable Legal Entities | Class B Ordinary Shares          
Shareholders' equity:          
Ordinary shares ¥ 10,316   ¥ 10,316