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CONVERTIBLE SENIOR NOTES AND CALL OPTIONS (Details)
12 Months Ended
Feb. 01, 2017
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
USD ($)
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2019
CNY (¥)
May 17, 2019
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CNY (¥)
Jul. 17, 2017
CNY (¥)
Jan. 24, 2014
USD ($)
Debt Instrument [Line Items]                        
Aggregate principal amount             ¥ 300,000,000       ¥ 300,000,000  
Debt Instrument, Interest Rate, Stated Percentage                     7.37%  
2019 Notes                        
Debt Instrument [Line Items]                        
Aggregate principal amount | $           $ 1,000           $ 150,000,000
Debt Instrument, Interest Rate, Stated Percentage                       4.00%
Convertible debt, conversion rate   21.8221                    
Convertible debt, conversion price | $ / shares           $ 45.83            
Debt covenant, ownership interest threshold           50.00% 50.00%          
Face value of notes repurchased | $         $ 88,900,000 $ 10,200     $ 61,100,000      
Percentage of notes repurchased 100.00% 0.00%   40.70% 59.30%              
Percentage of price redeemed at   100.00%   100.00% 96.00%              
Foreign exchange gain (loss)   ¥ 0 ¥ 68,632 ¥ 65,342                
Gain (loss) from change in fair value of convertible senior notes   0 0 845,071                
Unrealized Gain (Loss) on Derivatives   ¥ 0 0 ¥ 0                
Percentage Of principal Amount   100.00%                    
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 100.00% 0.00%   40.70% 59.30%              
2024 Convertible Notes                        
Debt Instrument [Line Items]                        
Aggregate principal amount | $           $ 1,000   $ 85,000,000        
Debt Instrument, Interest Rate, Stated Percentage               4.50%        
Convertible debt, conversion rate   52.0833                    
Convertible debt, conversion price | $ / shares           $ 19.20            
Debt covenant, ownership interest threshold           50.00% 50.00%          
Percentage of notes repurchased   100.00%                    
Fair value of convertible notes     7,675,500       ¥ 566,617     ¥ 728,215,869    
Foreign exchange gain (loss)     ¥ 21,089,777 ¥ 114,149,092                
Percentage Of principal Amount   100.00%                    
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed   100.00%