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FAIR VALUE MEASUREMENTS (Details)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
USD ($)
Beginning balance $ 12,613
Issuances
Exchange of warrants $ (10,546) [1]
Exercise of warrants (1,081)
Change in fair value (720)
Ending Balance 266 [2]
2013 Investor Warrants [Member]  
Beginning balance $ 10,546
Issuances
Exchange of warrants $ (10,546) [1]
Exercise of warrants
Change in fair value
Ending Balance [2]
2013 Placement Agent Warrants [Member]  
Beginning balance $ 998
Issuances
Exchange of warrants [1]
Exercise of warrants
Change in fair value $ (732)
Ending Balance 266 [2]
2010 Investor Warrants [Member]  
Beginning balance $ 1,065
Issuances
Exchange of warrants [1]
Exercise of warrants $ (1,081)
Change in fair value $ 16
Ending Balance [2]
2010 Placement Agent Warrants [Member]  
Beginning balance $ 4
Issuances
Exchange of warrants [1]
Exercise of warrants
Change in fair value $ (4)
Ending Balance [2]
[1] Represents the fair value carrying amount of 3,500,000 Series A Preferred shares and 5,250,000 warrants exchanged for 3,588,139 shares of Series B Preferred stock exercisable into 7,176,298 shares of common stock.
[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 September 30, 2015 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 52.5%, estimated based on a review of our historical volatility, and risk-free rates of return of 1.37% for the 2013 warrants 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.