7. Stock Option Plans and Agreements (Details 1)	6 Months Ended
Jun. 30, 2018 USD ($) $ / shares shares
Share-based Payment Arrangement [Abstract]
Number of options outstanding, beginning \| shares	8,031,000
Number of options expired \| shares	(306,000)
Number of options outstanding, ending \| shares	7,725,000
Number of options vested or expected to vest \| shares	6,787,000
Number of options exercisable \| shares	6,787,000
Weighted average exercise price outstanding, beginning \| $ / shares	$ 0.1
Weighted average exercise price expired \| $ / shares	0.23
Weighted average exercise price outstanding, ending \| $ / shares	0.09
Weighted average exercise price vested or expected to vest \| $ / shares	0.07
Weighted average exercise price exercisable \| $ / shares	$ 0.07
Weighted-average remaining contractual term outstanding	3 years 8 months 12 days
Weighted-average remaining contractual term vested or expected to vest	4 years 2 months 12 days
Weighted-average remaining contractual term exercisable	4 years 2 months 12 days
Aggregate intrinsic value outstanding \| $	$ 0
Aggregate intrinsic value vested or expected to vest \| $	0
Aggregate intrinsic value exercisable \| $	$ 0

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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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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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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

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