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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 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

     2,870         4.49   

Forfeited

     (9      4.62   

Expired

     (2      5.71   

Exercised

     (214      3.11   
  

 

 

    

Balances at March 31, 2015

  13,968      4.22   
  

 

 

    
Recognition of Stock-Based Compensation Expense

Stock-based compensation recognized on the Company’s unaudited condensed consolidated statements of operations for the three months ended March 31, 2015 and 2014, was as follows (in thousands):

 

     Three Months Ended  
     March 31,  
     2015      2014  

Stock-based compensation expense by caption:

     

Research and development

   $ 282       $ 183   

Selling, general and administrative

     1,192         762   
  

 

 

    

 

 

 

Total stock-based compensation expense

$ 1,474    $ 945