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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated membership upgrade contract term	20 years
Cash and cash equivalents, restricted cash	$ 31.7	$ 24.1
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lessor operating lease term	1 month
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Lessor operating lease term	6 months

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- Definition

Estimated Membership Upgrade Contract Term

+ References

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Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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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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Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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