Stock-based Compensation, Weighted Average Assumptions Used in Black-Scholes Option-pricing Model (Details) - 2018 Equity Incentive Plan [Member] - $ / shares |
12 Months Ended | |
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Dec. 31, 2023 |
Dec. 31, 2022 |
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Weighted-average Assumptions Used in Black-Scholes Option-pricing Model [Abstract] | ||
Expected stock price volatility | 96.00% | 97.40% |
Expected life of options (years) | 6 years 1 month 6 days | 5 years 9 months 18 days |
Expected dividend yield | 0.00% | 0.00% |
Risk free interest rate | 4.20% | 2.30% |
Share-based Compensation Arrangement by Share-based Payment Award [Abstract] | ||
Stock options vested (in shares) | 834,818 | 488,621 |
Weighted average fair value per share of options vesting (in dollars per share) | $ 2.41 | $ 3.29 |
Stock options forfeited (in shares) | 266,433 | 29,788 |
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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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- Definition Weighted average grant-date fair value of options vested. No definition available.
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- Details
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