FAIR VALUE MEASUREMENTS (Tables)

6 Months Ended

Jun. 30, 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 six months ended June 30, 2017: 

(in thousands)	2013 Placement Agent Warrants
Balance, December 31, 2016	$	203
Change in fair value	(126		)
Balance, June 30, 2017 (1)	$	77

(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 June 30, 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 2.0 years, estimated based on a review of our historical volatility of 55.720% and risk-free rates of return of 1.380% 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.