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FAIR VALUE MEASUREMENTS (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Beginning balance $ 5,749
Issuances   
Repurchase of warrants (1) (421) [1]
Change in fair value 9,599
Ending Balance 14,927 [2]
2013 Investor Warrants [Member]
  
Beginning balance 4,599
Issuances   
Repurchase of warrants (1)    [1]
Change in fair value 7,670
Ending Balance 12,269 [2]
2013 Placement Agent Warrants [Member]
  
Beginning balance 460
Issuances   
Repurchase of warrants (1)    [1]
Change in fair value 767
Ending Balance 1,227 [2]
2010 Investor Warrants [Member]
  
Beginning balance 689
Issuances   
Repurchase of warrants (1) (421) [1]
Change in fair value 1,151
Ending Balance 1,419 [2]
2010 Placement Agent Warrants [Member]
  
Beginning balance 1
Issuances   
Repurchase of warrants (1)    [1]
Change in fair value 11
Ending Balance $ 12 [2]
[1] (1) Represents amount paid to repurchase warrants exercisable into 142,857 shares of common stock, which were initially issued in the April 2010 capital raise transaction.
[2] (2) The warrants are valued using a trinomial lattice valuation methodology because that model embodies all of the relevant assumptions that address the features underlying these instruments. Significant assumptions used in the model at March 31, 2014 included the market price of our common stock, an expected dividend yield of zero, the remaining period to the expiration date of the warrants, expected volatility of our common stock over the remaining life of the warrants of 53%, estimated based on a review of our historical volatility, and risk-free rates of return of 0.6% based on constant maturity rates published by the U.S. Federal Reserve, applicable to the remaining life of the warrants. We also take into consideration a probability assumption for anti-dilution.