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The following table illustrates the various assumptions used to calculate the Black-Scholes option pricing model for stock options granted during the three-month and nine-month periods presented: (Details) - $ / shares	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Sep. 30, 2020
Share-based Payment Arrangement [Abstract]
Weighted-average risk-free interest rates	1.00%	1.00%	0.50%
Dividend yield	0.00%	0.00%	0.00%
Weighted-average expected life of the option	7 years	7 years	7 years
Weighted-average expected stock price volatility	65.00%	65.00%	94.00%
Weighted-average fair value of the options granted	$ 2.45	$ 2.45	$ 0.36

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

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

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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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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.

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