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FAIR VALUES OF ASSETS AND LIABILITIES (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Assets and liabilities measured at fair value on a recurring basis      
Derivative warrant liability $ 7,722 $ 7,224 $ 5,721
Recurring basis      
Assets and liabilities measured at fair value on a recurring basis      
Derivative warrant liability 7,722 7,224  
Recurring basis | Level 2      
Assets and liabilities measured at fair value on a recurring basis      
Derivative warrant liability $ 7,722 $ 7,224