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Stock-Based Compensation - Fair value of each option grant was estimated on the date of grant using Black-Scholes (Details)	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Stock-Based Compensation
Risk-free interest rate, minimum	3.50%	2.10%
Risk-free interest rate, maximum	4.40%	3.70%
Volatility, minimum	69.90%	67.50%
Volatility, maximum	80.00%	76.80%
Dividend yield	0.00%	0.00%
Minimum
Stock-Based Compensation
Expected life (years)	3 years 9 months 18 days	3 years 9 months 18 days
Maximum
Stock-Based Compensation
Expected life (years)	5 years 2 months 12 days	5 years 2 months 12 days

X

- 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.

+ References

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- Definition

The estimated measure of the maximum 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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The estimated measure of the minimum 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 maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

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

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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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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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