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Stockholders' Equity - Stock Options - Fair Value Assumptions (Details) | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Fair value assumptions |  |  |
Dividend yield (as a percent) |  |  | 0.00%
Stock Options |  |  |
Fair value assumptions |  |  |
Risk free rate of return, minimum (as a percent) | 1.69% | 0.57% | 0.32%
Risk free rate of return, maximum (as a percent) | 4.23% | 1.35% | 1.52%
Expected share price volatility, minimum (as a percent) | 39.73% | 26.06% | 18.13%
Expected share price volatility, maximum (as a percent) | 43.03% | 39.41% | 25.67%
Expected life in years | 5 years 10 months 20 days | 5 years 10 months 20 days |
Dividend yield (as a percent) | 0.00% | 0.00% |
Stock Options | Minimum |  |  |
Fair value assumptions |  |  |
Expected life in years |  |  | 5 years 7 months 17 days
Stock Options | Maximum |  |  |
Fair value assumptions |  |  |
Expected life in years |  |  | 6 years 29 days

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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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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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. + References No definition available. + Details
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- Definition 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. + References No definition available. + Details
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- Definition The maximum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition The minimum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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