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Stockholders' Equity - Unrecognized Compensation (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized [Abstract]
Compensation cost not yet recognized, options	$ 26.2
Stock Options
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized [Abstract]
Weighted-average remaining recognition period	2 years 9 months 18 days
Restricted Stock Units
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized [Abstract]
Compensation cost not yet recognized, other than options	$ 11.1
Weighted-average remaining recognition period	3 years 1 month 6 days

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of cost to be recognized for option under share-based payment arrangement.

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