Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2017

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 nine months ended September 30, 2017 and 2016:

	2017			2016
Risk-free interest rate		2.06	%		1.37	%
Expected volatility		99	%		109	%
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 nine months ended September 30, 2017:

			Weighted-
			Average
			Exercise
	Options		Price
	(in thousands)
Outstanding at December 31, 2016		7,067	$	1.33
Granted		682		0.75
Forfeited		(828)		1.68
Outstanding at September 30, 2017		6,921		1.23
Exercisable at September 30, 2017		6,022	$	1.14