Stock-based Compensation, Weighted Average Assumptions Used in Black-Scholes Option-pricing Model (Details) - 2020 Plan Evergreen Provision [Member] - shares |
3 Months Ended | 6 Months Ended | ||
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Jun. 30, 2023 |
Jun. 30, 2022 |
Jun. 30, 2023 |
Jun. 30, 2022 |
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Weighted Average Assumptions Used in Black-Scholes Option-pricing Model [Abstract] | ||||
Expected stock price volatility | 94.40% | 96.20% | 95.30% | 98.80% |
Expected life of options | 5 years 9 months 18 days | 5 years 8 months 12 days | 6 years 1 month 6 days | 5 years 10 months 24 days |
Expected dividend yield | 0.00% | 0.00% | 0.00% | 0.00% |
Risk free interest rate | 3.70% | 3.30% | 3.70% | 2.10% |
Share-based Compensation Arrangement by Share-based Payment Award [Abstract] | ||||
Stock options vested (in shares) | 374,757 | 204,406 | 620,824 | 267,103 |
Stock options forfeited (in shares) | 254,966 | 6,000 | 254,966 | 14,288 |
Former Chief Executive Officer [Member] | ||||
Share-based Compensation Arrangement by Share-based Payment Award [Abstract] | ||||
Stock options vested (in shares) | 145,418 | 145,418 | ||
Stock options forfeited (in shares) | 249,633 | 249,633 |
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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. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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://www.xbrl.org/2003/role/disclosureRef
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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://www.xbrl.org/2003/role/disclosureRef
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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://www.xbrl.org/2003/role/disclosureRef
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- Definition Number of non-vested options forfeited. No definition available.
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- Definition Number of options vested. No definition available.
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