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FAIR VALUE MEASUREMENTS (Tables)
12 Months Ended
Dec. 31, 2018
Fair Value Disclosures [Abstract]  
Schedule of fair value measurements for each class of assets on nonrecurring basis
 
Fair Value Measurement at the End of the Reporting Period Using
   
   
Quoted Prices
in Active
 
Significance
     
 
As of
 
Markets for
Identical
 
Other 
Observable
 
Significant
Unobservable
   
 
December 31,
2018
 
Assets 
(Level 1)
 
Inputs
(Level 2)
 
Inputs
(Level 3)
 
Total 
loss
 
 
RMB
 
US$
 
RMB
 
RMB
 
RMB
 
RMB
 
Description
                  
Fair value measurements on a recurring basis:
                  
Available-for-sale debt investments 50,000  7,272  50,000          -      -      - 
                   
Nonrecurring fair value measurements:
                  
Long-lived assets held and used 117  17  -  -  117  (7,768)
 
 
Fair Value Measurement at the End of the Reporting Period Using
   
   
Quoted Prices
in Active
 
Significance
     
 
As of
 
Markets for
Identical
 
Other 
Observable
 
Significant
Unobservable
   
 
December 31,
2017
 
Assets 
(Level 1)
 
Inputs 
(Level 2)
 
Inputs
(Level 3)
 
Total 
loss
 
 
RMB
 
US$
 
RMB
 
RMB
   
RMB
 
Description
                  
Nonrecurring fair value measurements:
                  
Long-lived assets held and used 632  97        -         -  632  (1,507)