Stock-based Compensation - Assumptions Used (Details) - shares	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	286,000	496,000	406,000
Nonemployee Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	9,000	76,000	0
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life (years)	5 years 7 months 6 days	5 years 3 months 18 days	5 years 7 months 6 days
Volatility	52.50%	50.40%	55.30%
Risk-free interest rate	0.80%	1.00%	2.40%
Expected dividend yield	0.00%	0.00%	0.00%
Nonemployee Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life (years)	5 years 7 months 6 days	5 years 4 months 24 days
Volatility	54.10%	51.60%
Risk-free interest rate	0.90%	0.40%
Expected dividend yield	0.00%	0.00%
PBOs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life (years)	5 years 6 months	5 years 3 months 18 days	5 years 7 months 6 days
Volatility	51.90%	49.90%	55.80%
Risk-free interest rate	0.70%	1.30%	2.50%
Expected dividend yield	0.00%	0.00%	0.00%

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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- Definition

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

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- Definition

Rate of weighted-average expected volatility for award under share-based payment arrangement.

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- Definition

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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No definition available.

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- Definition

Gross number of share options (or share units) granted during the period.

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No definition available.

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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://fasb.org/us-gaap/role/ref/legacyRef
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