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Stock-Based Compensation - Assumptions (Details)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Fair value assumptions
Expected term	6 years 1 month 6 days	6 years 1 month 6 days
Expected volatility	79.70%	69.70%
Expected dividend yield	0.00%	0.00%
Minimum
Fair value assumptions
Risk free interest rate	0.80%	0.60%
Maximum
Fair value assumptions
Risk free interest rate	1.40%	1.00%

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- References

No definition available.

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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

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-Publisher FASB
-Name Accounting Standards Codification
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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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Rate of weighted-average expected volatility for award under share-based payment arrangement.

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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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