Stock Options and Stock Grants (Details) - Stock Options [Member] - $ / shares	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Weighted-average risk-free interest rates:	0.50%	2.30%
Dividend yield:	0.00%	0.00%
Weighted-average expected life of the option:	5 years	6 years
Weighted-average expected stock price volatility	95.00%	94.00%
Weighted-average fair value of the options granted:	$ 0.28	$ 0.41

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

Rate of weighted-average expected volatility for award under share-based payment arrangement.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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- Definition

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 2
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