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Stock-based Awards (Tables)
 6 Months Ended
Jun. 30, 2014
Stock based Awards  
Summary of stock option activity

 

 

 
  
Number of
Options
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contract Life
(in years)
 

Outstanding at December 31, 2012

     15,418,788   $ 3.51     7.35  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

Granted

     5,193,127   $ 8.44        

Exercised

     (98,878 ) $ 1.73        

Canceled/forfeited

     (2,149,893 ) $ 3.68        
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Outstanding at December 31, 2013

     18,363,144   $ 4.89     7.17  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

Granted (unaudited)

     10,545,647   $ 15.86        

Exercised (unaudited)

     (1,741,058 ) $ 1.01        

Canceled/forfeited (unaudited)

     (502,943 ) $ 9.36        
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Outstanding at June 30, 2014 (unaudited)

     26,664,790   $ 9.40     7.98  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

Vested and expected to vest at December 31, 2013

    
16,947,300		  
$
4.66		    
7.05		  

Exercisable at December 31, 2013

     10,855,844   $ 2.82     5.97  

Vested and expected to vest at June 30, 2014 (unaudited)

     25,236,587   $ 9.32     7.91  

Exercisable at June 30, 2014 (unaudited)

     18,884,427   $ 8.72     7.39  
Schedule of activity in connection with restricted stock

  •  

          Activity in connection with the restricted stock is as follows for the year ended December 31, 2013:

 
  
Number of
Shares
 
Weighted-
Average
Grant Date
Fair Value
 

Non-vested — December 31, 2012

     122,222   $ 3.56  
             
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
             

Granted

     20,873   $ 8.90  

Vested

     (87,540 ) $ 4.83  
             
​ ​ ​ ​ ​ ​ ​ ​

Non-vested — December 31, 2013

     55,555   $ 3.56  
             
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
             

Granted (unaudited)

     —   $ —  

Vested (unaudited)

     27,777   $ 3.56  

Canceled/forfeited (unaudited)

     —   $ —  
             
​ ​ ​ ​ ​ ​ ​ ​

Non-vested — June 30, 2014 (unaudited)

     27,778   $ 3.56  
             
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
             
Schedule of activity in connection with the restricted stock units

  •  

          Activity in connection with the restricted stock units is as follows for the six months ended June 30, 2014 (unaudited):

 
   Number of
Shares		   Weighted-
Average
Grant Date
Fair Value		  

Non-vested — December 31, 2013

     —   $ —  
             
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
             

Granted (unaudited)

     720,146   $ 10.04  

Vested (unaudited)

     —   $ —  

Canceled/forfeited (unaudited)

     (6,607 ) $ 9.63  
             
​ ​ ​ ​ ​ ​ ​ ​

Non-vested — June 30, 2014 (unaudited)

     713,539   $ 10.04  
             
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​
             
Schedule of stock-based compensation cost relating to stock options and restricted stock awards

 

 

 
   Year Ended
December 31,		   Six Months
Ended
June 30,		  
 
  
2011
 
2012
 
2013
 
2013
 
2014
 
 
    
    
    
   (unaudited)
  

Cost of revenue

   $ 47   $ 122   $ 141   $ 53   $ 163  

Sales and marketing

     1,076     1,571     2,561     1,104     2,344  

Technology and development

     1,096     1,428     1,762     783     1,865  

General and administrative

     3,989     7,199     4,882     1,676     7,168  
                       
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total stock-based compensation expense

     6,208     10,320     9,346     3,616     11,540  

Amount capitalized to internal software use

     266     214     540     251     614  
                       
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total stock-based compensation cost

   $ 6,474   $ 10,534   $ 9,886   $ 3,867   $ 12,154  
                       
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​