Stock Plans and Stock-Based Compensation (Details) - Equity Option [Member]	12 Months Ended
	Dec. 31, 2018 $ / shares shares
Summary of stock options activity
Options Outstanding, Beginning balance | shares	15,163,001
Options Outstanding, Exercised | shares	(2,190,000)
Options Outstanding, Forfeited | shares	(83,375)
Options Outstanding, Canceled | shares	(2,881,625)
Options Outstanding, Ending balance | shares	10,008,001
Options Outstanding, Weighted Average Exercise Price, Beginning balance	$ 0.07
Options Outstanding, Weighted Average Exercise Price, Exercised	0.04
Options Outstanding, Weighted Average Exercise Price, Forfeited	0.05
Options Outstanding, Weighted Average Exercise Price, Canceled	0.04
Options Outstanding, Weighted Average Exercise Price, Ending balance	0.08
Options Outstanding, Weighted Average Fair Value, Beginning balance	0.07
Options Outstanding, Weighted Average Fair Value, Exercised	0.04
Options Outstanding, Weighted Average Fair Value, Forfeited	0.05
Options Outstanding, Weighted Average Fair Value, Canceled	0.04
Options Outstanding, Weighted Average Fair Value, Ending balance	$ 0.08
Options Outstanding, Weighted Average Remaining Contractual Life, Beginning balance	4 years 1 month 24 days
Options Outstanding, Weighted Average Remaining Contractual Life, Ending balance	4 years 9 months 22 days
Options Exercisable, Beginning balance | shares	12,561,401
Options Exercisable, Ending balance | shares	8,847,351
Options Exercisable, Weighted Average Exercise Price, Beginning balance	$ 0.07
Options Exercisable, Weighted Average Exercise Price, Ending balance	0.08
Options Exercisable, Weighted Average Fair Value, Beginning balance	0.07
Options Exercisable, Weighted Average Fair Value, Ending balance	$ 0.08
Options Exercisable, Weighted Average Remaining Contractual Life, Beginning balance	3 years 2 months 8 days
Options Exercisable, Weighted Average Remaining Contractual Life, Ending balance	4 years 4 months 28 days