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Stock-Based Compensation - Schedule of Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Stock-based compensation expense, by operating expense category |  |  |  |
Stock-based compensation expense | $ 23,934 | $ 21,057 | $ 46,899 | $ 36,926
Platform operations |  |  |  |
Stock-based compensation expense, by operating expense category |  |  |  |
Stock-based compensation expense | 2,358 | 1,331 | 3,820 | 2,387
Sales and marketing |  |  |  |
Stock-based compensation expense, by operating expense category |  |  |  |
Stock-based compensation expense | 6,319 | 4,831 | 11,633 | 8,058
Technology and development |  |  |  |
Stock-based compensation expense, by operating expense category |  |  |  |
Stock-based compensation expense | 7,844 | 6,497 | 16,434 | 11,433
General and administrative |  |  |  |
Stock-based compensation expense, by operating expense category |  |  |  |
Stock-based compensation expense | $ 7,413 | $ 8,398 | $ 15,012 | $ 15,048

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