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Stock-Based Compensation - Schedule of Stock-Based Compensation Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
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