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CASH AND CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2011
CASH AND CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS        
Short-term investments $ 867 $ 0    
Cash and cash equivalents and short-term investments        
Total cash and cash equivalents 22,826 516 2,721 13,340
Short-term investments (available-for-sale) 867 0    
Total cash and cash equivalents and short-term investments 23,693 516    
Cash
       
Cash and cash equivalents and short-term investments        
Total cash and cash equivalents 14,640 464    
Municipal bonds
       
CASH AND CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS        
Short-term investments 867      
Cash and cash equivalents and short-term investments        
Total cash and cash equivalents 8,186 52    
Short-term investments (available-for-sale) $ 867