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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2014
Activity Under Equity Incentive Plans Related to Stock Options

Activity under the Company’s equity incentive plans related to stock options is set forth below (in thousands except per share amounts):

 

     Number
of
Options
Outstanding
    Weighted
Average
Exercise
Price per
Share
 

Balance at December 31, 2013

     10,405      $ 3.46   

Granted

     2,641        6.00   

Forfeited

     (98     4.53   

Expired

     (30     9.78   

Exercised

     (900     2.49   
  

 

 

   

Balance at June 30, 2014

     12,018      $ 4.07   
  

 

 

   
Recognition of Stock-Based Compensation Expense

Stock-based compensation recognized on the Company’s condensed consolidated statements of operations for the three and six months ended June 30, 2014 and 2013, was as follows (in thousands):

 

     Three Months Ended      Six Months Ended  
     June 30,      June 30,  
     2014      2013      2014      2013  

Stock-based compensation expense by caption:

           

Research and development

   $ 276       $ 122       $ 459       $ 209   

Selling, general and administrative

     1,065         719         1,827         1,345   
  

 

 

    

 

 

    

 

 

    

 

 

 

Total stock-based compensation expense

   $ 1,341       $ 841       $ 2,286       $ 1,554