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PREFERRED SHARES (Details)
 1 Months Ended 12 Months Ended
Apr. 03, 2014
CNY (¥)
shares
Aug. 11, 2011
CNY (¥)
¥ / shares
shares
Sep. 25, 2008
CNY (¥)
¥ / shares
shares
Jan. 16, 2004
CNY (¥)
¥ / shares
shares
Dec. 31, 2016
$ / shares
Dec. 31, 2014
CNY (¥)
Dec. 31, 2015
$ / shares
Dec. 31, 2014
$ / shares
Jan. 01, 2013
$ / shares
Jan. 16, 2009
$ / shares
Temporary Equity [Line Items]                    
Share price | $ / shares               $ 8.60    
Stock issuance costs           ¥ 24,801,000        
Minimum [Member]                    
Temporary Equity [Line Items]                    
Share price | $ / shares         $ 9.99   $ 9.28   $ 3.75  
Preferred Stock [Member]                    
Temporary Equity [Line Items]                    
Liquidation Basis of Accounting, Liquidation Plan         In the event of any liquidation, dissolution, or winding up of the Company, the proceeds shall be distributed according to the following sequence: (i)first to the holders of the Series C convertible redeemable preferred shares at 150% of the Series C Original Issuance Price, plus declared but unpaid dividends on each share of Series C convertible redeemable preferred shares; (ii)second to the holders of Series B convertible redeemable preferred shares at 150% of the Series B Original Issuance Price, plus declared but unpaid dividends on each share of Series B convertible redeemable preferred shares, (iii)third to the holders of Series A convertible redeemable preferred shares at 100% of the Series A Original Issuance Price, plus declared but unpaid dividends on each share of Series A convertible redeemable preferred shares. The remaining assets of the Company, if any, shall be distributed pro rata to the holders of Series C convertible redeemable preferred shares, Series B convertible redeemable preferred shares, Series A convertible redeemable preferred shares and ordinary shares on an if-converted basis.          
Series A [Member]                    
Temporary Equity [Line Items]                    
Shares issued during period | shares       8,571,430            
Value of shares issued during period       ¥ 4,138,000            
Share price | ¥ / shares       ¥ 0.48            
Series A [Member] | Minimum [Member]                    
Temporary Equity [Line Items]                    
Share price | $ / shares                   $ 0.58
Series B [Member]                    
Temporary Equity [Line Items]                    
Shares issued during period | shares     5,630,630              
Value of shares issued during period     ¥ 34,099,000              
Share price | ¥ / shares     ¥ 6.06              
Conversion of debt     ¥ 10,230              
Shares issued for debt conversion | shares     1,689,190              
Series C [Member]                    
Temporary Equity [Line Items]                    
Shares issued during period | shares   10,914,852                
Value of shares issued during period   ¥ 127,817,000                
Share price | ¥ / shares   ¥ 11.71                
Stock issuance costs   ¥ 1,397,000                
Class B [Member] | Ordinary Shares [Member]                    
Temporary Equity [Line Items]                    
Shares issued for conversion of convertible redeemable preferred shares | shares 25,430,831                  
Conversion of convertible redeemable preferred shares ¥ 157,000                  
Series B convertible redeemable preferred shares [Member]                    
Temporary Equity [Line Items]                    
Preferred Stock, Redemption Terms         an amount equal to 150% of Series B Original Issuance Price; plus, an amount equal to all declared but unpaid dividends on each share of Series B convertible redeemable preferred shares; plus, 10% compound interest per annum on 150% of Series B Original Issuance Price for each Series B convertible redeemable preferred share from the date of issuance to the earliest redemption date of the security.          
Accretion of Convertible Redeemable Preferred Stock           3,530,000        
Series C convertible redeemable preferred shares [Member]                    
Temporary Equity [Line Items]                    
Preferred Stock, Redemption Terms         (i)an amount equal to 137.50% of the Series C Original Issuance Price, plus declared but unpaid dividends on each share of Series C convertible redeemable preferred shares; or (ii)the fair market value of the Series C convertible redeemable preferred shares as of the most recent year end, as determined by an independent appraiser mutually agreeable to the Company and the holder of the Series C convertible redeemable preferred shares.          
Accretion of Convertible Redeemable Preferred Stock           ¥ 0