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Stock-Based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | $ 412,565 | $ 73,451 | $ 1,061,085 | $ 172,575
Total Class B stock-based compensation expense |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | 409,922 | 73,451 | 1,058,442 | 172,575
Cost of revenue | Total Class B stock-based compensation expense |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | 45,618 | 13,717 | 170,536 | 31,943
Sales and marketing | Total Class B stock-based compensation expense |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | 31,507 | 943 | 46,417 | 3,168
General and administrative | Total Class B stock-based compensation expense |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | $ 332,797 | $ 58,791 | $ 841,489 | $ 137,464

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