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FAIR VALUE MEASUREMENTS (Tables)
3 Months Ended
Mar. 31, 2018
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, 2018
(in thousands)
2013
Placement Agent Warrants
Balance, December 31, 2017
$
20

Change in fair value
26

Balance, March 31, 2018
$
46

The warrants are valued using a trinomial lattice model. Significant assumptions used in the model at March 31, 2018 included the market price of our common stock, an expected dividend yield of zero, the remaining life of 1.2 years, historical volatility of 68.754% and risk-free rates of return of 2.153%.