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Stock-Based Compensation - Schedule of Stock-Based Compensation Expense by Operating Expense Category (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Stock-based compensation expense, by operating expense category |  |  |  |
Stock-based compensation expense | $ 11,417 | $ 5,893 | $ 27,958 | $ 12,406
Platform operations |  |  |  |
Stock-based compensation expense, by operating expense category |  |  |  |
Stock-based compensation expense | 1,234 | 818 | 3,137 | 1,543
Sales and marketing |  |  |  |
Stock-based compensation expense, by operating expense category |  |  |  |
Stock-based compensation expense | 3,033 | 1,500 | 7,757 | 3,277
Technology and development |  |  |  |
Stock-based compensation expense, by operating expense category |  |  |  |
Stock-based compensation expense | 4,013 | 1,990 | 8,905 | 3,981
General and administrative |  |  |  |
Stock-based compensation expense, by operating expense category |  |  |  |
Stock-based compensation expense | $ 3,137 | $ 1,585 | $ 8,159 | $ 3,605

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