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Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2015
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
 

Balances at December 31, 2014

     11,323       $ 4.13   

Granted

     3,151         4.54   

Forfeited

     (74      4.51   

Expired

     (3      5.87   

Exercised

     (261      2.90   
  

 

 

    

Balances at June 30, 2015

     14,136         4.24   
  

 

 

    
Recognition of Stock-Based Compensation Expense

Stock-based compensation recognized on the Company’s unaudited condensed consolidated statements of operations for the three and six months ended June 30, 2015 and 2014, was as follows (in thousands):

 

     Three Months Ended
June 30,
     Six Months Ended
June 30,
 
     2015      2014      2015      2014  

Stock-based compensation expense by caption:

           

Research and development

   $ 340       $ 276       $ 623       $ 459   

Selling, general and administrative

     1,364         1,065         2,556         1,827   
  

 

 

    

 

 

    

 

 

    

 

 

 

Total stock-based compensation expense

   $ 1,704       $ 1,341       $ 3,179       $ 2,286