Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

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, 2018 and 2017:

	2018			2017
Risk-free interest rate		2.70	%		2.06	%
Expected volatility		90	%		99	%
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, 2018:

				Weighted-
				Average
				Exercise
	Options			Price
	(in thousands)
Outstanding at December 31, 2017		642		$	11.60
Granted		398			1.73
Cancelled		(4	)		11.88
Expired		(39	)		10.61
Outstanding at September 30, 2018		997			7.71
Exercisable at September 30, 2018		554		$	11.09