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Stock-based Compensation - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |  |
Capitalized website development and internal-use software costs excluded from stock-based compensation expense | $ 777 | $ 656 |  | $ 2,212 | $ 1,323
Total payments for employees' tax obligations to taxing authorities due to net share settlements and cashless exercises of options | $ 3,106 | $ 2,922 |  | $ 11,314 | $ 8,708
Class A Common Stock |  |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |  |
Employee tax withholding requirements and option costs due to net share settlement | 114,973 | 111,370 | 119,009 | 404,626 | 337,313
2020 CO Plan |  |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |  |
Number of shares authorized for issuances | 485,714 |  |  | 485,714 |
2021 CO Plan |  |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |  |
Number of shares authorized for issuances | 228,571 |  |  | 228,571 |

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