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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

Stock-Based Compensation [Abstract]

Information about Stock Options Outstanding

The following tables summarize information about stock options and RSUs outstanding at December 31, 2019:

Options Outstanding													Options Vested and Exercisable
Range of Exercise Prices	Number Outstanding				Weighted Average Remaining Contractual Life (Years)				Weighted Average Exercise Price				Number Exercisable				Weighted Average Remaining Contractual Life (Years)				Weighted Average Exercise Price
$   2.35 -  6.95			4,376,396				7.08			$	4.29				2,826,062				6.48			$	4.31
$ 14.52 - 35.25			1,253,625				2.71			$	23.16				1,253,625				2.71			$	23.16
			5,630,021				6.11			$	8.49				4,079,687				5.32			$	10.10

Stock Option Activity

The following tables summarize activity under the Plan for the indicated periods:

		Options
		Number of Shares				Weighted Average Exercise Price				Weighted Average Remaining Contractual Life (Years)				Aggregate Intrinsic Value
Outstanding at December 31, 2017			5,138,066			$	8.41				—			$	—
Options granted			1,095,000				3.52				—				—
Options exercised			(117,229	)			1.15				—				—
Options cancelled			(117,000	)			5.34				—				—
Outstanding at December 31, 2018			5,998,837			$	7.72				—			$	—
Options granted			345,000				6.06				—				—
Options exercised			(663,816	)			1.23				—				—
Options cancelled			(50,000	)			4.95				—				—
Outstanding at December 31, 2019			5,630,021			$	8.49				6.11			$	516
Options exercisable at December 31, 2019			4,079,687			$	10.10				5.32			$	314

		RSUs
		Number of RSUs				Weighted Average Grant Date Fair Value				Aggregate Intrinsic Value
Outstanding at December 31, 2017			469,661			$	5.19			$	—
RSUs granted			246,663				3.26				—
RSUs vested			(211,330	)			6.19				—
Outstanding at December 31, 2018			504,994			$	3.83			$	—
RSUs granted			229,996				6.06				—
RSUs vested			(207,334	)			4.07				—
RSUs cancelled			(29,167	)			4.65
Outstanding at December 31, 2019			498,489			$	4.71			$	86

Stock-Based Compensation by Type of Award

Stock-based compensation expense is included in general and administrative expense for each period as follows:

Stock-Based Compensation by Type of Award		Year Ended December 31, 2019				Year Ended December 31, 2018
Stock options		$	2,756			$	2,926
RSUs			955				1,129
Total stock-based compensation expense		$	3,711			$	4,055

Fair Value Assumptions

The fair value of each option grant was estimated on the date of grant using the Black-Scholes option pricing model using the following weighted average assumptions:

	Year Ended December 31, 2019				Year Ended December 31, 2018
Expected stock price volatility			92.34	%			85.26	%
Risk-free interest rate			2.09	%			2.73	%
Expected life term	6.14 years				6.02 years
Expected dividends			0	%			0	%

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