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Stock-Based Compensation - Narrative (Details) - USD ($) $ in Millions			6 Months Ended
	May 12, 2020	May 15, 2018	Jun. 30, 2020	May 16, 2019
Stock-Based Compensation
Inducement stock options granted to new employees (in shares)			662,410
Common stock options
Stock-Based Compensation
Unrecognized compensation expense related to unvested stock options			$ 66.9
Expected weighted average period for recognized and unrecognized compensation expense			2 years 6 months
Performance options
Stock-Based Compensation
Options outstanding (in shares)			0
Unvested restricted stock and RSUs
Stock-Based Compensation
Expected weighted average period for recognized and unrecognized compensation expense			2 years 9 months 18 days
Unrecognized compensation expense related to unvested RSU awards			$ 19.2
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)	4,500,000
Shares available for grant (in shares)			5,176,799
2018 Employee Stock Purchase Plan
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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