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FAIR VALUE MEASUREMENTS (Tables)
3 Months Ended
Mar. 31, 2017
Fair Value Disclosures [Abstract]  
Reconciliation of changes in fair value of warrants
The following represents a reconciliation of the changes in fair value of warrants measured at fair value using Level 3 inputs during the three months ended March 31, 2017
(in thousands)
2013
Placement Agent Warrants
Balance, Balance, December 31, 2016
$
203

Change in fair value
(88
)
March 31, 2017 (1)
$
115

(1)
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, 2017 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 2.5 years, estimated based on a review of our historical volatility of 68.020% and risk-free rates of return of 1.500% 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.