Stock-Based Compensation - Options, Assumptions Under Black-Scholes (Details)	12 Months Ended
Dec. 31, 2020 $ / shares
Board Members
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected Term	3 years
Annual dividend yield	0.00%
Forfeiture rate	0.00%
Board Members \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	85.44%
Risk-free interest rate	0.23%
Market value of common stock	$ 18.20
Board Members \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	90.01%
Risk-free interest rate	1.43%
Market value of common stock	$ 18.41
Executives
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected Term	3 years 6 months
Expected volatility	80.95%
Risk-free interest rate	0.23%
Market value of common stock	$ 17.78
Annual dividend yield	0.00%
Forfeiture rate	0.00%

Represents the forfeiture rate.

No definition available.

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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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- 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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- Definition

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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

Price of a single share of a number of saleable stocks of a company.

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No definition available.

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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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