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CONVERTIBLE SENIOR NOTES AND CAPPED CALL OPTIONS (Details)
$ / shares in Units, $ in Millions
1 Months Ended 6 Months Ended 12 Months Ended
May 17, 2011
USD ($)
$ / shares
Jun. 30, 2017
CNY (¥)
Jun. 30, 2016
CNY (¥)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
USD ($)
Dec. 31, 2011
USD ($)
Jun. 30, 2017
USD ($)
$ / shares
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]                
Aggregate principal amount       ¥ 800,000,000        
Foreign exchange gain (loss)   ¥ 842,669 ¥ 17,748,875          
Call Option [Member]                
Debt Instrument [Line Items]                
Convertible debt, conversion price | $ / shares $ 48.21              
Premium paid for derivative | $ $ 18.0              
Change in fair value of convertible senior notes and capped call option     18,226,535          
2016 Notes [Member]                
Debt Instrument [Line Items]                
Aggregate principal amount | $ $ 125.0              
Debt issuance date           May 17, 2011    
Debt maturity date           May 15, 2016    
Stated interest rate 4.00%              
Convertible debt, conversion rate 29.6307              
Convertible debt, conversion price | $ / shares $ 33.75              
Debt covenant, ownership interest threshold 50.00%              
Call feature, percentage 100.00%              
Face value of notes repurchased | $         $ 22.5 $ 2.0 $ 22.5 $ 100.5
Percentage of notes repurchased       80.40% 18.00% 1.60%    
Percentage of price redeemed at       99.00% 96.00% 41.00%    
Foreign exchange gain (loss)     392,924          
Gain (loss) from change in fair value of convertible senior notes     5,533,892          
2019 Notes [Member]                
Debt Instrument [Line Items]                
Aggregate principal amount | $             $ 150.0  
Debt issuance date   Jan. 22, 2014            
Stated interest rate   4.00%         4.00%  
Convertible debt, conversion rate   21.8221            
Convertible debt, conversion price | $ / shares             $ 45.83  
Call feature, percentage 100.00%              
Face value of notes repurchased | $             $ 61.1 $ 88.9
Percentage of notes repurchased   40.70%   59.30%        
Percentage of price redeemed at   100.00%   96.00%        
Fair value of convertible notes   ¥ 67,744   ¥ 423,739,708        
Gain (loss) from change in fair value of convertible senior notes     ¥ 56,086,621