Stock Based Compensation - 2019 Stock Incentive Plan - Additional Information (Details) - 2019 Stock Incentive Plan - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 8.7	$ 2.1
Unrecognized compensation cost related to unvested stock option grants	$ 46.4
Period for recognized compensation cost	2 years 9 months 18 days
Restricted Stock Unit (RSU)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation cost related to unvested stock option grants	$ 20.2
Period for recognized compensation cost	4 years

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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