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Share-Based Payments - Narrative (Details)	9 Months Ended
	Sep. 30, 2020 USD ($) incentive_program	Sep. 30, 2019 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of incentive programs | incentive_program	3
Proceeds from exercise of stock options	$ 0	$ 0
Stock option compensation expense | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Period of stock option expiration from date of grant	10 years
Share-based Payment Arrangement [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation expense related to unvested share-based payments	$ 88,300,000
Share-based Payment Arrangement [Member] | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
General vesting period	3 years
Weighted-average period for unrecognized compensation expense expected to be recognized	2 years 1 month 6 days

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Number of Incentive Programs

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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.

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