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Stock-Based Compensation - Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Stock-based compensation expense, by operating expense category        
Stock-based compensation expense $ 5,893 $ 656 $ 12,406 $ 1,048
Platform operations        
Stock-based compensation expense, by operating expense category        
Stock-based compensation expense 818 75 1,543 114
Sales and marketing        
Stock-based compensation expense, by operating expense category        
Stock-based compensation expense 1,500 200 3,277 318
Technology and development        
Stock-based compensation expense, by operating expense category        
Stock-based compensation expense 1,990 216 3,981 330
General and administrative        
Stock-based compensation expense, by operating expense category        
Stock-based compensation expense $ 1,585 $ 165 $ 3,605 $ 286