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SHARE BASED COMPENSATION (Narrative) (Details)
1 Months Ended 4 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended
Jul. 31, 2009
May 14, 2010
CNY
Dec. 31, 2012
CNY
Dec. 31, 2011
CNY
Dec. 31, 2010
CNY
Dec. 31, 2012
USD ($)
Sep. 28, 2011
Dec. 21, 2012
Stock Options [Member]
USD ($)
Nov. 03, 2011
Stock Options [Member]
USD ($)
May 03, 2011
Stock Options [Member]
USD ($)
Mar. 11, 2011
Stock Options [Member]
USD ($)
Apr. 26, 2010
Stock Options [Member]
USD ($)
Apr. 12, 2010
Stock Options [Member]
USD ($)
Apr. 06, 2010
Stock Options [Member]
USD ($)
Jan. 25, 2010
Stock Options [Member]
Sep. 15, 2009
Stock Options [Member]
USD ($)
Dec. 31, 2012
Stock Options [Member]
CNY
Oct. 01, 2011
Stock Options [Member]
Employee A [Member]
USD ($)
Dec. 31, 2012
Stock Options [Member]
Employee A [Member]
Oct. 01, 2011
Stock Options [Member]
Employee B [Member]
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                        
Ordinary shares that may be issued 7,325,122           9,325,122                          
Contractual life 7 years                                      
Options granted     160,000         160,000 1,120,000 100,000 300,000 785,480     726,250 3,024,750   4,180,000   32,000
Exercise price of options granted               $ 1.42 $ 1.42 $ 6.50 $ 5.65 $ 2.08 $ 2.08 $ 2.08   $ 3.13   $ 1.42   $ 1.42
Share-based compensation   14,651,329 17,343,110                                  
Incremental charge resulted from the repricing, recognized during period       9,879,124 5,132,052                              
Number of vesting increments               5 24 5 5 5     5   5 5 36 1
Exercise price as a percentage of initial public offering price per share                             85.00%          
Market value of ordinary shares           $ 1.55                            
Intrinsic value of options exercised     14,454    2,938,203                              
Fair value per option at grant date (RMB)     5.60 6.91 16.85                       5.60      
Fair value of options vested     14,784,850 9,558,119 9,363,356                              
Unrecognized share-based compensation expense     14,995,792                                  
Unrecognized share-based compensation expense, weighted-average recognition period     3 years 4 months 24 days                                  
Cash received from the exercise of share options