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CASH AND CASH EQUIVALENTS AND SHORT-TERM INVESTMENTS (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2013
Cash and cash equivalents and short-term investments        
Total cash and cash equivalents $ 509 $ 12,149 $ 10,799 $ 24,936
Short-term investments (available-for-sale) 0 8,024    
Total cash and cash equivalents and short-term investments 509 20,173    
Cash        
Cash and cash equivalents and short-term investments        
Total cash and cash equivalents $ 509 8,744    
Money market funds        
Cash and cash equivalents and short-term investments        
Total cash and cash equivalents   877    
Municipal bonds        
Cash and cash equivalents and short-term investments        
Total cash and cash equivalents   2,528    
Short-term investments (available-for-sale)   $ 8,024