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Equity-Based Compensation - Compensation expense (Details) - Class B Units - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Equity-Based Compensation |  |  |  |
Compensation expense | $ 8,165 | $ 1,181 | $ 20,846 | $ 2,286
Cost of revenues |  |  |  |
Equity-Based Compensation |  |  |  |
Compensation expense | 1,442 | 53 | 3,738 | 151
Sales and marketing |  |  |  |
Equity-Based Compensation |  |  |  |
Compensation expense | 602 | 34 | 1,636 | 99
Research and development |  |  |  |
Equity-Based Compensation |  |  |  |
Compensation expense | 514 | 34 | 1,528 | 97
General and administrative expenses |  |  |  |
Equity-Based Compensation |  |  |  |
Compensation expense | $ 5,607 | $ 1,060 | $ 13,944 | $ 1,939

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