Stock Based Compensation (Tables)

3 Months Ended

12 Months Ended

Mar. 31, 2019

Dec. 31, 2018

STOCK-BASED COMPENSATION

Summary of Stock Options Outstanding

The following table summarizes stock options outstanding and changes for the three-month periods ending March 31, 2019 and 2018:

	March 31, 2019			March 31, 2018
		Weighted			Weighted
	Number of	Average		Number of	Average
	Stock	Exercise		Stock	Exercise
	Options	Price		Options	Price
Stock options outstanding at beginning of period	19,170	$	79.78	5,723	$	276.50
Granted	—		—	—		—
Expired	(280)		179.68	(112)		624.00
Stock options outstanding at end of period	18,890	$	78.21	5,611	$	269.50
Stock options exercisable at end of period	18,890	$	78.21	1,828	$	682.50

The following table summarizes stock options outstanding and changes during the years ended December 31, 2018 and 2017:

	December 31,					December 31,
	2018					2017
	Number of Stock Options			Weighted Average Exercise Price		Number of Stock Options			Weighted Average Exercise Price
Stock options outstanding at beginning of period		286,174		$	5.53		110,828		$	18.24
Granted		812,689			0.98		189,164			1.40
Expired		(140,374	)		5.97		(13,818	)		50.88
Canceled or forfeited		-			-		-			-
Stock options outstanding at end of period		958,489		$	1.60		286,174		$	5.53
Stock options exercisable at end of period		958,489		$	1.60		97,010		$	13.59

Summary of Stock Options Outstanding and Exercisable by Stock Option Plan

The following table summarizes stock options outstanding and exercisable by stock option plan at March 31, 2019:

	Outstanding Stock Options			Exercisable Stock Options
	Number of	Weighted		Number of	Weighted
	Outstanding	Average		Exercisable	Average
Stock Option Plan	Stock Options	Exercise  Price		Stock Options	Exercise Price
2004 Plan	96	$	1,752.25	96	$	1,752.25
2004 Directors’ Plan	11		9,332.73	11		9,332.73
2013 Plan	12,766		35.41	12,766		35.41
Replacement Stock Options-Alabama Graphite	5,568		80.96	5,568		80.96
Replacement Stock Options-Anatolia Energy	449		676.22	449		676.22
	18,890	$	78.21	18,890	$	78.21

The following table summarizes stock options outstanding and exercisable by stock option plan at December 31, 2018:

	Outstanding Stock Options				Exercisable Stock Options
Stock Option Plan	Number of Stock Options Outstanding		Weighted Average Exercise Price		Number of Stock Options Exercisable		Weighted Average Exercise Price
2004 Plan		4,792	$	35.14		4,792	$	35.14
2004 Directors' Plan		556		186.00		556		186.00
2013 Plan		638,270		0.71		638,270		0.71
Replacement Options - AGC		289,600		1.61		289,600		1.61
Replacement Options-AEK		25,271		13.41		25,271		13.41
		958,489	$	1.60		958,489	$	1.60

Summary of Status of Non-vested Restricted Shares

The following table summarizes RSU activity for the three-month periods ended March 31, 2019 and 2018:

	March 31,			March 31,
	2019			2018
		Weighted-			Weighted-
		Average			Average
	Number of	Grant Date		Number of	Grant Date
	RSUs	Fair Value		RSUs	Fair Value
Unvested RSUs at beginning of period	2,260	$	70.00	3,578	$	70.00
Granted	—		—	—		—
Forfeited	(565)		70.00	(189)		70.00
Vested	—		—	—		—
Unvested RSUs at end of period	1,695	$	70.00	3,389	$	70.00

The following table summarizes RSU activity for the years ending December 31, 2018 and 2017:

	December 31,					December 31,
	2018					2017
	Number of RSUs			Weighted-Average Grant Date Fair Value		Number of RSUs			Weighted-Average Grant Date Fair Value
Unvested RSUs at beginning of period		178,897		$	1.40		8,649		$	43.71
Granted		-			-		304,064			1.40
Forfeited		(37,674	)		1.40		(34,845	)		5.72
Vested		(28,245	)		1.40		(98,971	)		2.50
Unvested RSUs at end of period		112,978		$	1.40		178,897		$	1.40