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Stock-Based Compensation - Schedule of Stock-Based Compensation Expense (Detail) - 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
Stock-based compensation expense, by operating expense category |  |  |  |
Stock-based compensation expense | $ 34,459 | $ 26,852 | $ 132,010 | $ 73,751
Platform operations |  |  |  |
Stock-based compensation expense, by operating expense category |  |  |  |
Stock-based compensation expense | 2,518 | 1,639 | 11,624 | 5,459
Sales and marketing |  |  |  |
Stock-based compensation expense, by operating expense category |  |  |  |
Stock-based compensation expense | 9,099 | 6,916 | 37,362 | 18,549
Technology and development |  |  |  |
Stock-based compensation expense, by operating expense category |  |  |  |
Stock-based compensation expense | 11,269 | 7,911 | 41,337 | 24,345
General and administrative |  |  |  |
Stock-based compensation expense, by operating expense category |  |  |  |
Stock-based compensation expense | $ 11,573 | $ 10,386 | $ 41,687 | $ 25,398

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