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ORGANIZATION AND PRINCIPAL ACTIVITIES (Organizational Information) (Details)
$ / shares in Units, ¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 18, 2015
USD ($)
$ / shares
shares
Dec. 18, 2015
CNY (¥)
shares
Jun. 25, 2015
USD ($)
$ / shares
shares
Jan. 05, 2015
USD ($)
$ / shares
shares
Dec. 31, 2015
CNY (¥)
shares
Dec. 31, 2016
$ / shares
shares
Dec. 31, 2015
$ / shares
shares
Jan. 04, 2015
$ / shares
Dec. 31, 2014
shares
Sep. 24, 2014
$ / shares
shares
Dec. 31, 2013
shares
Ordinary shares:                      
Ordinary shares, authorized (in shares)       500,000,000   500,000,000 500,000,000        
Ordinary shares, issued (in shares)           119,512,300 117,000,000        
Ordinary shares, outstanding (in shares)           119,512,300 117,000,000        
Ordinary shares, par value (in dollars per share) | $ / shares     $ 0.0001 $ 0.0001   $ 0.0001 $ 0.0001 $ 1.00      
Subdivision of shares       10,000              
Authorized capital | $       $ 50              
Share price | $ / shares     $ 0.0001                
Shares issued for stock split transaction     99,990,000 10,000              
Aggregate value for stock issued in stock split transaction     $ 10   ¥ 62            
Pre-Stock Split                      
Ordinary shares:                      
Ordinary shares, authorized (in shares)                   50,000  
Ordinary shares, issued (in shares)                   1  
Ordinary shares, outstanding (in shares)                   1  
Ordinary shares, par value (in dollars per share) | $ / shares                   $ 1.00  
Ordinary shares                      
Ordinary shares:                      
Ordinary shares, issued (in shares)           119,512,300 117,000,000   100,000,000   100,000,000
Aggregate value for stock issued in stock split transaction | ¥         62            
American Depositary Shares | Ordinary shares                      
Ordinary shares:                      
Entity listing depository receipt ratio 2                    
IPO                      
Ordinary shares:                      
Issuance of ordinary shares | ¥         ¥ 419,775            
IPO | Ordinary shares                      
Ordinary shares:                      
Shares issued         15,000,000            
Issuance of ordinary shares | ¥         ¥ 10            
IPO | American Depositary Shares                      
Ordinary shares:                      
Shares issued 7,500,000 7,500,000                  
Share price | $ / shares $ 10.00                    
Issuance of ordinary shares $ 75,000 ¥ 485,500                  
Private Placement                      
Ordinary shares:                      
Issuance of ordinary shares | ¥         ¥ 58,257            
Private Placement | Ordinary shares                      
Ordinary shares:                      
Shares issued 2,000,000 2,000,000     2,000,000            
Share price | $ / shares $ 5                    
Issuance of ordinary shares | ¥         ¥ 1            
Aggregated cash consideration $ 10,000 ¥ 64,700