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FINANCIAL INFORMATION OF PARENT COMPANY - PARENT COMPANY CONDENSED BALANCE SHEETS (Details)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Current assets:            
Cash and cash equivalents ¥ 58,063,733 $ 8,418,450 ¥ 428,420,773      
Prepayments and other current assets, net 272,487,578 39,506,985 528,109,288 $ 82,871,871    
Total current assets 397,674,315 57,657,357 1,050,511,405      
Investments in subsidiaries and VIE 35,297,395 5,117,641 73,915,119      
Total assets 599,106,683 86,862,304 1,310,318,375      
Current liabilities:            
Amounts due to intercompany 21,159,559 3,067,848 23,790,959      
Total current liabilities 564,162,525 81,795,877 544,295,473      
Total liabilities 571,568,330 82,869,618 546,862,815      
SHAREHOLDERS' EQUITY (DEFICIT)            
Additional paid-in capital 4,371,228,191 633,768,513 4,139,122,755      
Statutory reserves 7,326,560 1,062,251 7,326,560      
Accumulated other comprehensive loss (12,527,540) (1,816,323) (12,693,760)      
Accumulated deficit (4,378,321,226) (634,796,906) (3,403,462,176)      
Total shareholders' equity (deficit) 45,309,203 6,569,217 776,470,952      
Total liabilities and shareholders' equity 599,106,683 86,862,304 1,310,318,375      
Parent Company            
Current assets:            
Cash and cash equivalents 18,704,249 2,711,861 12,243,809 $ 1,775,185 ¥ 8,545,918 ¥ 143,896
Prepayments and other current assets, net     56,226      
Amounts due from intercompany 2,378,886,528 344,906,125 2,358,774,226      
Total current assets 2,397,590,777 347,617,986 2,371,074,261      
Investments 8,199,715 1,188,847 44,452,310      
Investments in subsidiaries and VIE (2,150,220,191) (311,752,623) (1,420,365,177)      
Total assets 255,570,301 37,054,210 995,161,394      
Current liabilities:            
Accrued expenses and other current liabilities 18,772,708 2,721,787 61,326,625      
Amounts due to intercompany 78,728,877 11,414,614 12,689,811      
Warrants 51,775,453 7,506,735 51,825,629      
Bond payable 60,984,058 8,841,857 92,848,377      
Total current liabilities 210,261,096 30,484,993 218,690,442      
Total liabilities 210,261,096 30,484,993 218,690,442      
SHAREHOLDERS' EQUITY (DEFICIT)            
Additional paid-in capital 4,371,228,191 633,768,513 4,139,122,755      
Statutory reserves 7,326,560 1,062,251 7,326,560      
Accumulated other comprehensive loss (12,527,539) (1,816,323) (12,693,760)      
Accumulated deficit (4,378,321,225) (634,796,906) (3,403,462,176)      
Total shareholders' equity (deficit) 45,309,205 6,569,217 776,470,952      
Total liabilities and shareholders' equity 255,570,301 37,054,210 995,161,394      
Class A ordinary shares            
SHAREHOLDERS' EQUITY (DEFICIT)            
Ordinary shares 56,659,429 8,214,845 45,233,784      
Class A ordinary shares | Parent Company            
SHAREHOLDERS' EQUITY (DEFICIT)            
Ordinary shares 56,659,429 8,214,845 45,233,784      
Class B ordinary shares            
SHAREHOLDERS' EQUITY (DEFICIT)            
Ordinary shares 943,789 136,837 943,789      
Class B ordinary shares | Parent Company            
SHAREHOLDERS' EQUITY (DEFICIT)            
Ordinary shares ¥ 943,789 $ 136,837 ¥ 943,789