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Stock-based compensation (Tables)
9 Months Ended
Sep. 30, 2013
Summary of Stock-Based Compensation Expense

Stock-based compensation expense

Stock-based compensation by award type is as follows:

 

     Three months ended September 30,      Nine months ended September 30,  
     2013      2012      2013      2012  

Stock options

   $ 2,495       $ 167       $ 4,757       $ 516   

Restricted stock awards

     21         18         76         54   
  

 

 

    

 

 

    

 

 

    

 

 

 
   $ 2,516       $ 185       $ 4,833       $ 570   
  

 

 

    

 

 

    

 

 

    

 

 

 
Total Compensation Cost Recognized for Stock-Based Compensation Awards

Total compensation cost recognized for all stock-based compensation awards in the consolidated statements of operations and comprehensive loss is as follows:

 

     Three months ended September 30,      Nine months ended September 30,  
     2013      2012      2013      2012  

Research and development

   $ 1,683       $ 85       $ 2,942       $ 308   

General and administrative

     833         100         1,891         262   
  

 

 

    

 

 

    

 

 

    

 

 

 
   $ 2,516       $ 185       $ 4,833       $ 570   
  

 

 

    

 

 

    

 

 

    

 

 

 
Summary of Restricted Common Stock

Restricted Common Stock

 

     Shares     Weighted-
average
grant date

fair value
 

Unvested balance at December 31, 2012

     155      $ 0.95   

Granted

     —          —     

Vested

     (66     1.01   

Forfeited

     —          —     
  

 

 

   

 

 

 

Unvested balance at September 30, 2013

     89      $ 0.95   
  

 

 

   

 

 

 
Summary of Stock Option Activity Under Plan

The following table summarizes the stock option activity under the Company’s equity award plans:

 

     Shares     Weighted-
average
exercise
price

per share
 

Outstanding at December 31, 2012

     2,201      $ 2.09   

Granted

     1,855      $ 7.12   

Exercised

     (37   $ 2.46   

Canceled or forfeited

     (42   $ 3.79   
  

 

 

   

Outstanding at September 30, 2013

     3,977      $ 4.41   

Exercisable at September 30, 2013

     1,336      $ 2.06   

Vested and expected to vest at September 30, 2013

     3,977      $ 4.41