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Stock Options and Restricted Stock Units - Weighted Average Fair Values and Assumptions (Details) - $ / shares	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Stock Options and Restricted Stock Units
Weighted average fair value of options granted (in dollars per share)	$ 1.79	$ 3.10
Risk-free interest rate	3.88%
Expected term (years)	3 years
Expected volatility factor	79.95%
Minimum
Stock Options and Restricted Stock Units
Risk-free interest rate		1.94%
Expected term (years)		3 years
Expected volatility factor		62.00%
Maximum
Stock Options and Restricted Stock Units
Risk-free interest rate		2.75%
Expected term (years)		6 years 5 months 1 day
Expected volatility factor		76.48%

X

- 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.

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

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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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