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ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Tables)
 12 Months Ended
Dec. 31, 2014
ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES [Abstract]  
Summary of Accrued Expenses and Other Current Liabilities
As of
December 31,
2013		   As of
December 31,
2014		     As of
December 31,
2014		  
RMB   RMB     US$  
           
Advance from end users 40,578       66,679       10,747  
Business tax and other taxes payable     4,031       4,360       703  
Deferred government grant     17,925       14,016       2,259  
Professional fees payable     15,442       11,323       1,825  
Promotional events payables     3,752       10,869       1,752  
Advertising and sponsorship payable     902       2,267       365  
Others     5,616       8,478       1,365  
                         
      88,246       117,992       19,016