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Stock-Based Compensation - Expense (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Stock-based compensation expense, by operating expense category |  |
Stock-based compensation expense | $ 2,322 | $ 159
Platform operations |  |
Stock-based compensation expense, by operating expense category |  |
Stock-based compensation expense | 229 | 15
Sales and marketing |  |
Stock-based compensation expense, by operating expense category |  |
Stock-based compensation expense | 539 | 50
Technology and development |  |
Stock-based compensation expense, by operating expense category |  |
Stock-based compensation expense | 665 | 40
General and administrative |  |
Stock-based compensation expense, by operating expense category |  |
Stock-based compensation expense | $ 889 | $ 54

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