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Stock-Based Compensation - Narrative (Details) - USD ($) $ in Millions				6 Months Ended
	May 12, 2021	May 12, 2020	May 15, 2018	Jun. 30, 2021	May 16, 2019
Stock-Based Compensation
Inducement stock options granted to new employees (in shares)				444,070
Common stock options
Stock-Based Compensation
Unrecognized compensation expense related to unvested stock options				$ 98.9
Performance options
Stock-Based Compensation
Options outstanding (in shares)				114,780
Unvested restricted stock and RSUs
Stock-Based Compensation
Unrecognized compensation expense related to unvested RSU awards				$ 26.9
2019 Incentive Plan
Stock-Based Compensation
Shares of common stock, maximum authorized for issuance (in shares)					3,500,000
Number of additional shares authorized (in shares)	2,750,000	4,500,000
Shares available for grant (in shares)				4,679,956
2018 ESPP
Stock-Based Compensation
Shares of common stock, maximum authorized for issuance (in shares)			1,000,000
Number of additional shares authorized (in shares)			1,200,000
Percentage of outstanding shares			2.00%

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Gross number of inducement share options (or share units) granted during the period.

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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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