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Summary of Significant Accounting Policies - Additional Information 1 (Details) |  |  |  |  | 12 Months Ended |  |
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Nov. 30, 2023 shares | Jan. 01, 2023 | Jan. 14, 2021 USD ($) $ / shares shares | Dec. 09, 2020 shares | Dec. 31, 2023 USD ($) Days $ / shares shares | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) shares | Dec. 31, 2024 USD ($) | Sep. 26, 2022 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Payment of revenue, performance obligation, description of payment terms |  |  |  |  | 30 to 60 days |  |  |  |
Costs to obtain a contract |  |  |  |  | $ 24,093,000 | $ 17,394,000 |  |  |
Amortization of deferred contract costs |  |  |  |  | 11,817,000 | 11,067,000 | $ 12,653,000 |  |
Guarantee income |  |  |  |  | 1,890,000 | 10,026,000 | 5,537,000 |  |
Maximum potential amount of future payments required to make under guarantees |  |  |  |  | 10,158,000 | 31,056,000 | 76,075,000 |  |
Tax expense related to stock-based compensation |  |  |  |  | 5,500,000 | 4,181,000 | 1,179,000 |  |
Income tax benefit from stock-based compensation expense |  |  |  |  | 5,353,000 | 5,441,000 | 5,301,000 |  |
Advertising expense |  |  |  |  | 138,782,000 | 156,128,000 | 151,457,000 |  |
Deferred financing costs |  |  |  |  | 1,927,000 | 2,442,000 | 0 |  |
Amortization of deferred financing costs |  |  |  |  | 515,000 | 136,000 | 0 |  |
Exercise of guarantee net loss |  |  |  |  | 417,000 | 4,568,000 |  |  |
Business acquisition, stock consideration |  |  |  |  |  |  | $ 103,645,000 |  |
Stock repurchases excise tax percentage |  | 1.00% |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Letter of credit facility |  |  |  |  | 0 | 0 |  |  |
Line of credit facility maximum borrowing amount |  |  |  |  | 390,373,000 |  |  |  | $ 400,000,000
Deferred financing costs |  |  |  |  | 1,927,000 | 2,442,000 |  |  |
Amortization of deferred financing costs |  |  |  |  | 515,000 | 136,000 |  |  |
Revolving Credit Facility | Letter of Credit Facility |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Letter of credit facility |  |  |  |  | $ 9,627,000 | $ 0 |  |  | $ 50,000,000
Restricted Stock Units |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Other than option outstanding | shares |  |  |  |  | 5,687,711 | 4,484,291 |  |  |
Employee Stock Option |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Options granted during period | shares |  |  |  |  | 0 | 30,266 | 619,618 |  |
Requisite service period |  |  |  |  | 4 years |  |  |  |
Vesting period |  |  |  |  | 10 years |  |  |  |
Market-based RSU |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Other than option outstanding | shares |  |  |  |  | 0 |  |  |  |
CarOffer |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Business acquisition, percentage of equity interest acquired |  |  | 51.00% |  |  |  | 51.00% |  |
Number of days guarantee period | Days |  |  |  |  | 45 |  |  |  |
Maximum potential amount of future payments required to make under guarantees |  |  |  |  | $ 10,158,000 | $ 31,056,000 | $ 76,075,000 |  |
Contingent loss liabilities |  |  |  |  | $ 0 | $ 0 | $ 0 |  |
Business acquisition date |  |  | Jan. 14, 2021 |  |  |  |  |  |
Business acquisition, aggregate consideration |  |  | $ 173,155,000 |  |  |  |  |  |
Aggregate consideration amount |  |  | 69,510,000 |  |  |  |  |  |
Retention pool aggregate amount |  |  | 8,000,000 |  |  |  |  |  |
Retention pool amount granted to employees |  |  | 6,000,000 |  |  |  |  |  |
Retention pool amount available for issuance to future employees |  |  | 2,000,000 |  |  |  |  |  |
CarOffer | 2022 Call Right |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Business acquisition, option to acquire remaining percentage of interest |  |  |  |  |  | 25.00% |  |  |
CarOffer | Scenario Forecast | 2022 Call Right |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Business acquisition, option to acquire remaining value of interest |  |  |  |  |  |  |  | $ 100,000,000 |
CarOffer | Restricted Stock Units |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Requisite service period |  |  |  |  | 4 years |  |  |  |
Class A Common Stock |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Common stock, par value | $ / shares |  |  |  |  | $ 0.001 | $ 0.001 |  |  |
Class A Common Stock | CarOffer |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Business acquisition, stock consideration |  |  | $ 103,645,000 |  |  |  |  |  |
Business acquisition, stock consideration shares issued | shares |  |  | 3,115,282 |  |  |  |  |  |
Business acquisition, share price | $ / shares |  |  | $ 22.51 |  |  |  |  |  |
2020 CO Plan |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Vesting description | with one-third having vested on each of January 14, 2022, and January 14, 2023, and one-third vesting on January 14, 2024, provided that a grantee’s continuous service to CarOffer has not terminated on the applicable vesting date. |  |  |  |  |  |  |  |
Vesting Agreement | CarOffer |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Business acquisition, percentage of equity interest acquired |  |  |  | 51.00% |  |  |  |  |
Vesting number of shares | shares |  |  |  | 432,592 |  |  |  |  |
Vesting description |  |  |  |  | with one-third having vested on each of January 14, 2022, and January 14, 2023, and one third vesting on January 14, 2024, subject to the terms of the Vesting Agreement. |  |  |  |
2021 CO Plan |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |
Number of shares authorized for issuances | shares | 228,571 |  |  |  |  |  |  |  |

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