Stock-based Compensation, Weighted Average Assumptions Used in Black-Scholes Option-pricing Model (Details) - 2018 Equity Incentive Plan [Member] - $ / shares |
3 Months Ended | |
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Mar. 31, 2024 |
Mar. 31, 2023 |
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| Weighted Average Assumptions Used in Black-Scholes Option-pricing Model [Abstract] | ||
| Expected stock price volatility | 97.50% | 95.40% |
| Expected life of options | 6 years 1 month 6 days | 6 years 1 month 6 days |
| Expected dividend yield | 0.00% | 0.00% |
| Risk free interest rate | 4.10% | 3.70% |
| Share-based Compensation Arrangement by Share-based Payment Award [Abstract] | ||
| Stock options vested (in shares) | 164,555 | 246,068 |
| Weighted average fair value per share of options vesting (in dollars per share) | $ 2.82 | $ 2.44 |
| Stock option exercised (in shares) | 0 | 0 |
| Stock options forfeited (in shares) | 344,905 | 0 |
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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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- Definition Number of share options (or share units) exercised during the current period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Details
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