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Stock-based Compensation - Weighted-average Assumptions (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Black-Scholes-Merton option valuation model based on weighted-average assumptions [Abstract]
Expected term	5 years 9 months 18 days	7 years
Risk-free interest rate	0.58%	2.41%
Expected volatility	128.60%	96.50%
Dividends	0.00%	0.00%
Resulting fair value	$ 1.87	$ 0.26

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- 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.

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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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