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Stock-Based Compensation - Stock-Based Incentive Plans (Details)
Jun. 26, 2013
shares
Dec. 31, 2019
numberOfPlans
Stock-Based Incentive Plans    
Number of stock-based incentive plans   5
ScanScout    
Stock-Based Incentive Plans    
Number of stock-based incentive plans assumed as part of acquisition   2
2013 Plan    
Stock-Based Incentive Plans    
Common stock initial reserve (shares) | shares 1,333,333  
Period for automatic increase in reserve (years) 10 years  
Term of equity incentive plan (years) 10 years  
2013 Plan | Maximum    
Stock-Based Incentive Plans    
Percent of common stock shares by which the reserve automatically increases (percent) 4.00%  
Stock option awards | 2013 Plan | Maximum    
Stock-Based Incentive Plans    
Expiration period of options (years) 10 years