Schedule of Stock Option Activity to Employees and Directors (Details) - $ / shares	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Beginning of Period
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Beginning of Period
Exercise price	$ (0.74)	$ (0.82)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, End of Period	4,404,818
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, End of Period	$ 0.69
Employees and directors stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Beginning of Period	2,939,818	2,660,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Beginning of Period	$ 0.65	$ 0.60
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period	1,250,000	659,818
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price	$ 0.74	$ 0.82
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period	(175,000)	(170,000)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price	$ (0.69)	$ (0.63)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period	(100,000)	(75,000)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price	$ (0.52)	$ (0.65)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	(60,000)	(135,000)
Exercise price	$ (0.56)	$ (0.46)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, End of Period	3,854,818	2,939,818
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, End of Period	$ 0.68	$ 0.65

Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Net number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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