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FAIR VALUE OF FINANCIAL INSTRUMENTS - Level 3 and Unobservable Inputs (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Level 3      
Reconciliation of the beginning and ending balances of the fair value measurements using significant unobservable inputs (Level 3)      
Marketability discount due to lapses of restriction period $ 0    
Warrant      
Reconciliation of the beginning and ending balances of the fair value measurements using significant unobservable inputs (Level 3)      
Balance at the beginning of the period 366,080 $ 305,560 $ 305,560
Warrant liability loss 66,190 163,810  
Balance at the end of the period $ 432,270 $ 469,370 $ 366,080
Warrant | Level 3      
Reconciliation of the beginning and ending balances of the fair value measurements using significant unobservable inputs (Level 3)      
Expected Volatility (as a percent) 24.10%    
Warrant | Minimum | Level 3      
Reconciliation of the beginning and ending balances of the fair value measurements using significant unobservable inputs (Level 3)      
Discount for lack of marketability (as a percent) 14.00%   18.00%
Warrant | Maximum | Level 3      
Reconciliation of the beginning and ending balances of the fair value measurements using significant unobservable inputs (Level 3)      
Discount for lack of marketability (as a percent) 16.00%   20.00%