Stockholders' Equity (Valuation Assumptions) (Details) |
6 Months Ended | ||||||||
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May 02, 2021 |
Mar. 26, 2021 |
Dec. 17, 2020 |
Dec. 07, 2020 |
Nov. 05, 2020 |
Apr. 06, 2020 |
Mar. 24, 2020 |
Jun. 30, 2021 |
Jun. 30, 2020 |
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| Stockholders' Equity [Abstract] | |||||||||
| Risk-free interest rate | 1.01% | 0.58% | |||||||
| Expected life (years) | 6 years | 6 years | |||||||
| Expected volatility | 74.79% | 73.97% | 77.41% | 77.35% | 77.36% | 78.21% | 77.56% | 74.16% | 77.57% |
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- References No definition available.
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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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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