Stock-Based Compensation - Assumptions (Details)	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Fair value assumptions
Expected volatility	79.69%
Minimum
Fair value assumptions
Expected term	5 years 3 months 18 days	6 years 1 month 6 days
Expected volatility		69.70%
Risk free interest rate	0.80%	0.30%
Maximum
Fair value assumptions
Expected term	6 years 1 month 6 days
Expected volatility		81.10%
Risk free interest rate	1.40%	1.00%

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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

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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