Stock Compensation (Schedule of Option Activity) (Details) - $ / shares	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Stock Compensation [Abstract]
Number of Shares, Outstanding at December 31, 2018	4,678,420
Number of Shares, Options granted	1,438,695
Number of Shares, Options exercised	(12,500)	(99,937)
Number of Shares, Options forfeited	(9,200)
Number of Shares, Options cancelled or expired	(690,430)
Number of Shares, Outstanding at December 31, 2019	5,404,985	4,678,420
Number of Shares, Vested or expected to vest at December 31, 2019	5,401,528
Number of Shares, Exercisable at December 31, 2019	5,232,179
Weighted Average Exercise Price, Outstanding at December 31, 2018	$ 2.81
Weighted Average Exercise Price, Options granted	0.65
Weighted Average Exercise Price, Options exercised	0.70
Weighted Average Exercise Price, Options forfeited	2.66
Weighted Average Exercise Price, Options cancelled or expired	1.54
Weighted Average Exercise Price, Outstanding at December 31, 2019	2.40	$ 2.81
Weighted Average Exercise Price, Vested or expected to vest at December 31, 2019	2.40
Weighted Average Exercise Price, Exercisable at December 31, 2019	$ 2.40
Weighted Average Remaining Contractual Life (In Years), Outstanding at December 31, 2019	3 years 6 months 7 days
Weighted Average Remaining Contractual Life (In Years), Vested or expected to vest at December 31, 2019	3 years 6 months 7 days
Weighted Average Remaining Contractual Life (In Years), Exercisable at December 31, 2019	3 years 6 months 7 days

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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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Gross 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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Number of fully vested and expected to vest exercisable options that may 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 exercisable or convertible options. 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 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 per share amount at which grantees can acquire shares of common stock by exercise of options.

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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 exercisable or convertible options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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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