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Entity wide accounts receivable major distribution partner.

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Entity wide accounts receivable or revenue major customer.

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Minimum threshold percentage of income tax benefit for settlement with tax authority.

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Revenue From Contract With Customer Estimated Average User Life.

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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Additions made to capitalized computer software costs during the period.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Specific incremental costs directly attributable to a proposed or actual offering of securities which are deferred at the end of the reporting period.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2020	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($) $ / DisstributionPartner Day	Dec. 31, 2019 USD ($) Day $ / DisstributionPartner	Dec. 31, 2018 USD ($) $ / DisstributionPartner	Jan. 01, 2019 USD ($)
Accounting Policies [Line Items]
Accounts Receivable, Allowance for Credit Loss			$ 0	$ 0	$ 0
Deferred Offering Costs			3,600		0
Capitalized Computer Software, Additions			0	0	0
Goodwill, Impairment Loss			0	0	0
Impairment, Long-Lived Asset, Held-for-Use			0	0
Advertising Expense			550,900	436,100	$ 143,900
Operating Lease, Right-of-Use Asset		$ 77,435	84,336	14,895
Operating Lease, Liability			93,961
Operating Lease, Liability, Current		21,278	22,206	2,510
Operating Lease, Liability, Noncurrent		$ 65,705	$ 71,755	$ 12,745
Minimum Threshold Percentage of Income Tax Benefit for Settlement with Tax Authority			50.00%
Accounting Standards Update 2018-11 [Member]
Accounting Policies [Line Items]
Operating Lease, Right-of-Use Asset						$ 10,100
Operating Lease, Liability						10,100
Operating Lease, Liability, Current						2,200
Operating Lease, Liability, Noncurrent						$ 7,900
Maximum [Member]
Accounting Policies [Line Items]
Finite-Lived Intangible Asset, Useful Life			7 years
Estimated average user life		9 months
Minimum [Member]
Accounting Policies [Line Items]
Finite-Lived Intangible Asset, Useful Life	2 years
Estimated average user life		6 months
Accounts Receivable [Member] \| Major Distribution Partners [Member]
Accounting Policies [Line Items]
Number of Major distribution partner \| Day			2	1
Accounts Receivable [Member] \| Major Distribution Partners [Member] \| Major Distrubutor Partner one [Member]
Accounting Policies [Line Items]
Concentration Risk, Percentage			20.00%	12.00%
Accounts Receivable [Member] \| Major Distribution Partners [Member] \| Major Distrubutor Partner Two [Member]
Accounting Policies [Line Items]
Concentration Risk, Percentage			13.00%
Revenue from Contract with Customer Benchmark [Member] \| Customer Concentration Risk [Member]
Accounting Policies [Line Items]
Number of major customers \| $ / DisstributionPartner			0	0	0