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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
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