Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2018

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The Company utilized the Black-Scholes valuation model for estimating the fair value of the stock options granted, with the following weighted-average assumptions for options granted in the three months ended March 31, 2018 and 2017:

	2018			2017
Risk-free interest rate		2.59	%		2.09	%
Expected volatility		95	%		100	%
Expected term in years		6.1			6.1
Dividend yield		-	%		-	%

Schedule of Share-based Compensation, Stock Options, Activity

The following summary represents option activity under the Company’s stock-based compensation plan for the three months ended March 31, 2018:

			Weighted-
			Average
			Exercise
	Options		Price
	(in thousands)
Outstanding at December 31, 2017		642	$	11.60
Granted		3		2.08
Cancelled		(4)		11.88
Outstanding at March 31, 2018		641		11.58
Exercisable at March 31, 2018		573	$	10.82