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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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