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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of stock-based compensation expense by operating expense category

Total stock-based compensation expense, by operating expense category, in the condensed consolidated statements of operations was as follows (in thousands):

 

     Three Months
Ended March 31,
 
     2017      2016  

Platform operations

   $ 229      $ 15  

Sales and marketing

     539        50  

Technology and development

     665        40  

General and administrative

     889        54  
  

 

 

    

 

 

 

Total

   $ 2,322      $ 159  
  

 

 

    

 

 

 
Summary of stock option activity

Stock option activity for the three months ended March 31, 2017 was as follows:

 

     Shares
Under Option
(in thousands)
     Weighted-
Average
Exercise Price
 

Outstanding at December 31, 2016(1)

     5,429      $ 4.94  

Granted

     44        29.60  

Exercised

     (680      0.40  

Cancelled

     (126      20.10  
  

 

 

    

Outstanding as of March 31, 2017(2)

     4,667      $ 5.43  
  

 

 

    

 

 

 

Exercisable as of March 31, 2017

     2,710      $ 1.13  
  

 

 

    

 

 

 

 

 

  (1)  Includes options to purchase 389 and 5,040 shares of Class A and Class B common stock, respectively.
  (2)  Includes options to purchase 393 and 4,274 shares of Class A and Class B common stock, respectively.