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Stockholders' Equity - Black Scholes option (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Expected term (years)		5 years 10 months 6 days		5 years 10 months 6 days
Expected volatility	93.00%	99.00%
Expected dividends	0.00%	0.00%	0.00%	0.00%
Minimum
Expected term (years)	5 years 10 months 6 days		5 years 10 months 6 days
Risk free interest rate	0.80%	0.34%	0.45%	0.34%
Expected volatility			93.00%	96.00%
Maximum
Expected term (years)	10 years		10 years
Risk free interest rate	1.58%	0.38%	1.58%	1.32%
Expected volatility			94.00%	99.00%

X

- Definition

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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iii)
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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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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

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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