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CASH AND CASH EQUIVALENTS (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash and cash equivalents          
Cash and cash equivalents including restricted cash and cash equivalents $ 9,818 $ 18,705   $ 9,882  
Less: restricted cash equivalents (78) (302)      
Cash and cash equivalents 9,740 18,403 8,051 9,882 7,401
Cash at bank and on hand
         
Cash and cash equivalents          
Cash and cash equivalents including restricted cash and cash equivalents 2,333 2,823   1,287  
Bankers' acceptances
         
Cash and cash equivalents          
Cash and cash equivalents including restricted cash and cash equivalents 78 1,369   5,501  
Treasury bills
         
Cash and cash equivalents          
Cash and cash equivalents including restricted cash and cash equivalents 949 5,026   492  
Promissory notes
         
Cash and cash equivalents          
Cash and cash equivalents including restricted cash and cash equivalents 2,372 6,020   639  
Commercial papers
         
Cash and cash equivalents          
Cash and cash equivalents including restricted cash and cash equivalents 2,184 753   1,963  
Term deposit notes
         
Cash and cash equivalents          
Cash and cash equivalents including restricted cash and cash equivalents $ 1,902 $ 2,714