Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

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

Summary of Stock Option Activity and Related Information

A summary of our stock option activity and related information is as follows:

	Number of Options		Weighted Average Exercise Price
Outstanding January 1, 2017	9,236,228		$	2.76
Granted	2,596,480		1.47
Exercised	(136,056	)	1.50
Forfeited / Expired	(2,777,539	)	4.76
Outstanding December 31, 2017	8,919,113		1.78
Granted	2,434,732		2.26
Exercised	(112,484	)	1.57
Forfeited / Expired	(285,853	)	2.62
Outstanding December 31, 2018	10,955,508		1.87
Granted	3,402,608		1.55
Exercised	(48,152	)	1.40
Forfeited / Expired	(334,293	)	2.71
Outstanding December 31, 2019	13,975,671		$	1.77
Vested during 2019	2,508,333		$	1.88
Vested and exercisable at December 31, 2019	8,919,741		$	1.81

Summarizes Information Concerning Options Outstanding and Options Vested and Exercisable

	December 31, 2019
	Options Outstanding				Options Vested and Exercisable
Exercise Price	Number of Options	Weighted Average Remaining Contractual Life	Weighted Average Exercise Price		Number of Options	Weighted Average Remaining Contractual Life	Weighted Average Exercise Price
$1.01 – $1.55	6,832,730	8.0 years	$	1.47	3,223,605	3.2 years	$	1.42
$1.56 – $1.98	2,685,058	4.7 years	$	1.72	2,499,294	4.1 years	$	1.72
$2.06 – $3.84	4,457,883	7.2 years	$	2.26	3,196,842	5.0 years	$	2.26
	13,975,671				8,919,741

Summary of Restricted Stock Unit Activity and Related Information

A summary of our restricted stock unit activity and related information is as follows:

	Number of Restricted Stock Units		Weighted Average Fair Value
Outstanding January 1, 2017	1,201,159		$	1.92
Granted	1,054,720		1.46
Vested-common stock issued	(571,118	)	1.75
Forfeited / Expired	(35,775	)	1.82
Outstanding December 31, 2017	1,648,986		1.69
Granted	787,968		2.31
Vested-common stock issued	(741,424	)	1.81
Forfeited / Expired	(38,842	)	1.74
Outstanding December 31, 2018	1,656,688		1.93
Granted	1,350,150		1.55
Vested-common stock issued	(938,311	)	1.87
Forfeited / Expired	(36,347	)	1.69
Outstanding December 31, 2019	2,032,180		$	1.71
Vested/Issued cumulative at December 31, 2019	5,508,176		$	1.75