Stock-Based Compensation Plan (Tables)

3 Months Ended

Mar. 31, 2019

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

The following summary represents option activity under the Company’s stock-based compensation plans for the three months ended March 31, 2019:

				Weighted-
				Average
				Exercise
	Options			Price
	(in thousands)
Outstanding at December 31, 2018		37		$	112.60
Granted		35			18.40
Cancelled		(1	)		41.33
Outstanding at March 31, 2019		71			67.26
Exercisable at March 31, 2019		16			186.16

Warrant [Member]

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, 2019 and 2018, respectively:

	2019			2018
Risk-free interest rate		2.23	%		2.59	%
Expected volatility		126	%		95	%
Expected term in years		6.0			6.1
Dividend yield		-%			-%