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Related Party Transactions (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 31, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Aug. 31, 2019
Related Party Transaction [Line Items]
Related party revenue		$ 245	$ 1,041	$ 864	$ 2,479
Related party payables, net		1,238		1,238		$ 2,515
Related party receivables		503		503		874
Operating cash flows from operating leases				1,317	2,389
Operating lease right-of-use assets		11,360		11,360		12,337
Notes receivable		1,155		1,155
Related Party Owner
Related Party Transaction [Line Items]
Operating cash flows from operating leases		383	376	1,150	1,128
Operating lease, expense		556	556	1,668	1,668
Operating lease right-of-use assets		10,738		10,738		11,957
Total lease liabilities		7,789		7,789		8,490
One-Time Bonus Payment | Founder
Related Party Transaction [Line Items]
Expenses from transactions with related party	$ 10,000
Revenue Share Expenses | Related Party Owner And Affiliates
Related Party Transaction [Line Items]
Expenses from transactions with related party		1,337	1,255	8,921	2,884
Call Center Support And Other Services Expense | Related Party Owner And Affiliates
Related Party Transaction [Line Items]
Expenses from transactions with related party		347	98	960	941
Corporate Functions | Related Party Owner
Related Party Transaction [Line Items]
Related party payables, net		1,338		1,338		3,288
Fees And Accounting And Marketing Services Revenue | Class B Unitholders
Related Party Transaction [Line Items]
Related party revenue		93	86	235	280
Related party receivables		582		$ 582		$ 689
Lead Generation Marketing Expense | Related Party Vendor
Related Party Transaction [Line Items]
Expenses from transactions with related party			4,292		12,336
Class B Unitholder Note, Issued August 2019 | Class B Unitholders
Related Party Transaction [Line Items]
Interest income					25
Notes receivable							$ 3,000
Class A Unitholder Note Issued April 2020 | Class A Unitholders
Related Party Transaction [Line Items]
Interest rate				0.86%
Interest income		$ 2	$ 2	$ 7	$ 3
Repayment period following IPO				30 days

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