Equity-Based Compensation - 2017 Omnibus Incentive Plan (Details) - 2017 Omnibus Incentive Plan	9 Months Ended
Sep. 30, 2021 shares
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Service-based vesting period	4 years
Restricted Stock Units Milestone Gift
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Service-based vesting period	7 days
Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Maximum number of awards authorized for grant (in shares)	14,000,000
Number of shares available for grant (in shares)	10,000,000

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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Number of shares authorized for issuance under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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