Stock Options (Tables)

12 Months Ended

Dec. 31, 2019

Share-based Payment Arrangement [Abstract]

Summary of Stock Options Activity

Additional information concerning the activity in the four option plans is as follows:

	2019					2018
	Options			Weighted Average Exercise Price		Options			Weighted Average Exercise Price
Outstanding, beginning of year		11,785,000		$	0.05		3,180,000		$	0.20
Granted		5,000			0.03		10,980,000			0.02
Exercised		—			—		—			—
Forfeited		(233,333	)		0.02		(1,408,334	)		0.02
Expired		(404,167	)		0.14		(966,666	)		0.10
Outstanding, end of year		11,152,500			0.05		11,785,000			0.05
Exercisable, end of year		4,987,505			0.08		2,190,000			0.19
Options available for future grant, end of year		10,602,864					2,463,336

Schedule of Unvested Options Activity

Additional information concerning the unvested options is as follows:

	2019					2018
	Options			Weighted Average Exercise Price		Options			Weighted Average Exercise Price
Non-Vested options at beginning of year		9,595,000		$	0.02		270,840		$	0.15
Granted		5,000			0.03		10,980,000			0.02
Vested		(3,201,672	)		0.02		(247,506	)		0.16
Forfeited		(233,333	)		0.02		(1,408,334	)		0.10
Cancelled		—			—		—			—
Non-Vested options end of year		6,164,995		$	0.02		9,595,000		$	0.02

Summary of Options Outstanding by Price Range

Summarized information with respect to options outstanding under the four option plans at December 31, 2019 is as follows:

	Options Outstanding			Options Exercisable
Range of Exercise Price	Number Outstanding	Remaining Average Contractual Life (In Years)	Weighted Average Exercise Price	Number Exercisable	Weighted Average Exercise Price
$0.017 -$.0446	11,152,500	7.38	$0.050	4,987,505	$0.085

Schedule of Fair Value Assumptions

The estimated fair value of each stock option grant on the date of grant was computed using the following weighted-average assumptions:

	December 31,
	2019		2018
Risk-free interest rate	1.02% - 3.68	%	2.64% - 2.70	%
Expected term (life) of options (in years)	7.38		5
Expected dividends	—		—
Expected volatility	138% - 234	%	188% - 217	%