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FAIR VALUE MEASUREMENTS (Assets and Liabilities Measured Using Unobservable Inputs) (Details) - CNY (¥)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Call Option [Member]      
Issuance of convertible senior notes ¥ 206,577,000 ¥ 0  
Balance at January 1, 0 0 ¥ 0
Issuance of call options 206,577,000 0  
Foreign exchange (gain)/loss 2,709,000 0  
Change in fair value of call options 84,891,634 0  
Balance at December 31, 294,177,634 0 0
Convertible Senior Notes [Member]      
Balance at January 1, 68,632 65,342 423,739,708
Issuance of convertible senior notes 585,301,500    
Foreign exchange (gain)/loss 7,675,500 3,290 (845,071)
Change in fair value of convertible senior notes 114,149,092    
Change in the instrument-specific credit risk 21,089,777    
Repurchase of convertible senior notes (68,632)   (422,829,295)
Balance at December 31, 728,215,869 ¥ 68,632 ¥ 65,342
Issuance of call options ¥ 585,301,500