Stock Plans and Stock Based Compensation (Schedule of Stock Option Activity) (Details) - 2006 Plan [Member]	6 Months Ended
	Jun. 30, 2019 $ / shares shares
Summary of stock options activity
Options Outstanding, Beginning balance | shares	10,008,001
Options Outstanding, Ending balance | shares	10,008,001
Options Outstanding, Weighted Average Exercise Price, Beginning balance	$ 0.08
Options Outstanding, Weighted Average Exercise Price, Ending balance	0.08
Options Outstanding, Weighted Average Fair Value, Beginning balance	0.08
Options Outstanding, Weighted Average Fair Value, Ending balance	$ 0.08
Options Outstanding, Weighted Average Remaining Contractual Life, Beginning balance	4 years 9 months 28 days
Options Outstanding, Weighted Average Remaining Contractual Life, Ending balance	4 years 3 months 22 days
Options Exercisable, Beginning balance | shares	8,847,351
Options Exercisable, Ending balance | shares	8,847,351
Options Exercisable, Weighted Average Exercise Price, Beginning balance	$ 0.08
Options Exercisable, Weighted Average Exercise Price, Ending balance	0.08
Options Exercisable, Weighted Average Fair Value, Beginning balance	0.08
Options Exercisable, Weighted Average Fair Value, Ending balance	$ 0.08
Options Exercisable, Weighted Average Remaining Contractual Life, Beginning balance	4 years 3 months 22 days
Options Exercisable, Weighted Average Remaining Contractual Life, Ending balance	3 years 10 months 28 days