Stock-based Compensation - Unrecognized Compensation Cost (Details) $ in Millions	3 Months Ended
Mar. 31, 2020 USD ($)
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized [Abstract]
Unrecognized compensation cost, options	$ 1.9
Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized [Abstract]
Expected to be recognized over a weighted-average period	1 year 10 months 24 days
Restricted Stock Units (RSUs) [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized [Abstract]
Unrecognized compensation cost, excluding options	$ 12.1
Expected to be recognized over a weighted-average period	2 years 6 months
Employee Stock [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized [Abstract]
Unrecognized compensation cost, excluding options	$ 0.2
Expected to be recognized over a weighted-average period	3 months 18 days

No definition available.

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- Definition

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

+ Details

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- Definition

Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

+ References

+ Details

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- Definition

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

+ References

+ Details

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