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Basis of Presentation and Summary of Significant Accounting Policies (Details)		3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 08, 2020 agreement	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) reporting_unit	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Accounting Policies [Line Items]
Commissions payable		$ 28,900,000		$ 28,900,000		$ 34,100,000
Advertising expenses		6,600,000	$ 7,100,000	$ 21,700,000	$ 15,700,000
Number of reporting units (segment) | reporting_unit				1
Impairment of goodwill		0	$ 0	$ 0	0
Impairment charges				$ 0	$ 2,700,000
Number of tax receivable agreements | agreement	2
Payment provided as percent of net cash savings	85.00%
Benefit retained as percent of net cash savings	15.00%
Award vesting period				4 years
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2019-12
Accounting Policies [Line Items]
Total deferred tax assets						6,300,000
Waltham office relocation
Accounting Policies [Line Items]
Impairment charges						2,700,000
Internal use developed software
Accounting Policies [Line Items]
Amortization period				4 years
Operating lease, right-of-use asset | Waltham office relocation
Accounting Policies [Line Items]
Impairment charges						1,500,000
Leasehold improvements | Waltham office relocation
Accounting Policies [Line Items]
Impairment charges						1,200,000
Accrued expenses and other current liabilities
Accounting Policies [Line Items]
Commissions payable, current		26,700,000		$ 26,700,000		31,400,000
Other noncurrent liabilities
Accounting Policies [Line Items]
Commissions payable, non-current		$ 2,200,000		$ 2,200,000		$ 2,700,000
Minimum
Accounting Policies [Line Items]
Subscription contract, term				1 year
Estimated useful life				3 years
Deferred commissions, amortization period		1 year		1 year
Amortization period				2 years
Maximum
Accounting Policies [Line Items]
Subscription contract, term				3 years
Estimated useful life				10 years
Deferred commissions, amortization period		3 years		3 years
Amortization period				15 years

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