Stock-Based Compensation - Stock Options and Appreciation Rights, Assumptions (Details) - $ / shares	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Fair Value
Weighted average Black-Scholes fair value of stop options and SARs granted (in usd per share)	$ 65.78	$ 116.26
Stock options
Fair Value
Risk-free interest rate, minimum	1.40%	0.50%
Risk-free interest rate, maximum	2.00%	0.90%
Dividend yield	0.00%	0.00%
Volatility, minimum	120.50%	124.70%
Volatility, maximum	130.60%	140.30%
Stock options \| Minimum
Fair Value
Expected term (in years)	4 years 1 month 6 days	4 years 1 month 6 days
Stock options \| Maximum
Fair Value
Expected term (in years)	5 years 3 months 18 days	5 years 3 months 18 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.

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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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No definition available.

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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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No definition available.

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- Definition

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

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No definition available.

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- Definition

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

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- Definition

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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- 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.

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