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FAIR VALUE MEASUREMENTS (Assets and Liabilities Measured Using Unobservable Inputs) (Details) - CNY (¥)
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Call Option [Member]    
Issuance of convertible senior notes ¥ 0 ¥ 206,577,000
Balance at January 1, 294,177,634 0
Issuance of call options 0 206,577,000
Foreign exchange (gain)/loss (4,983,000) 5,610,000
Change in fair value of call options 218,498,321 (663,084)
Balance at December 31, 507,692,955 211,523,916
Convertible Senior Notes [Member]    
Balance at January 1, 728,215,869 68,632
Issuance of convertible senior notes   585,301,500
Foreign exchange (gain)/loss (14,117,988) 10,462,359
Change in fair value of convertible senior notes 516,665,506 (38,525,112)
Change in the instrument-specific credit risk 11,004,379 (56,904)
Repurchase of convertible senior notes   (68,632)
Balance at December 31, ¥ 1,241,767,766 557,181,843
Issuance of call options   ¥ 585,301,500