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Acquisitions - Additional Information (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 14, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2024 | Dec. 31, 2022
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Issuance of stock for acquisition |  |  |  |  |  |  |  | $ 103,645,000 |  |  |
Revenue |  | $ 222,915,000 |  |  | $ 147,472,000 |  |  | 612,031,000 | $ 399,898,000 |  |
Net income (loss) |  | $ 29,199,000 | $ 28,052,000 | $ 22,361,000 | $ 32,563,000 | $ 7,131,000 | $ 12,696,000 | $ 79,612,000 | $ 52,390,000 |  |
Car Offer |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business acquisition date | Jan. 14, 2021 |  |  |  |  |  |  |  |  |  |
Business acquisition, percentage of interest acquired | 51.00% | 51.00% |  | 51.00% |  |  |  | 51.00% |  |  |
Business acquisition, total consideration | $ 173,155,000 |  |  |  |  |  |  |  |  |  |
Issuance of stock for acquisition | 103,645,000 |  |  |  |  |  |  |  |  |  |
Payments to acquire business | 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 |  |  |  |  |  |  |  |  |  |
Acquisition-related costs incurred |  | $ 2,647,000 |  |  |  |  |  | $ 2,647,000 |  |  |
Revenue |  | 62,992,000 |  |  |  |  |  | 135,847,000 |  |  |
Net income (loss) |  | 178,000 |  |  |  |  |  | (8,912,000) |  |  |
Car Offer | 2022 Call Right | Forecast |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business acquisition, option to acquire remaining percentage of interest |  |  |  |  |  |  |  |  |  |  | 25.00%
Business acquisition, option to acquire remaining value of interest |  |  |  |  |  |  |  |  |  | $ 100,000,000 |
Car Offer | General and Administrative |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Acquisition-related costs incurred |  | $ 0 |  |  |  |  |  | $ 709,000 |  |  |
Car Offer | Class A Common Stock |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Issuance of stock for acquisition | $ 103,645,000 |  |  |  |  |  |  |  |  |  |
Business acquisition, stock consideration shares issued | 3,115,282 |  |  |  |  |  |  |  |  |  |
Business acquisition, share price | $ 22.51 |  |  |  |  |  |  |  |  |  |

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