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Stock-based Compensation - Schedule of Estimating Fair Value of the Stock Options and Common stock Warrants Granted (Details)	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Employee Service Share Based Compensation Aggregate Disclosures [Abstract]
Volatility	88.78%	83.30%
Expected life (years)	6 years 29 days	6 years 29 days
Risk-free interest rate	0.67%
Risk-free interest rate minimum		0.45%
Risk-free interest rate maximum		1.40%
Dividend rate	0.00%	0.00%

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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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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.

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-Publisher FASB
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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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-Publisher FASB
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-Topic 718
-SubTopic 10
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- Definition

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

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

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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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