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

Balances at December 31, 2013

     10,405      $ 3.46   

Granted

     2,347        6.20   

Forfeited

     (36     4.49   

Expired

     (30     9.78   

Exercised

     (478     2.65   
  

 

 

   

Balances at March 31, 2014

     12,208      $ 4.00   
  

 

 

   
Recognition of Stock-Based Compensation Expense

Stock-based compensation recognized on the Company’s condensed consolidated statements of operations for the three months ended March 31, 2014 and 2013, was as follows (in thousands):

 

     Three Months Ended
March 31,
 
     2014      2013  

Stock-based compensation expense by caption:

     

Research and development

   $ 183       $ 87   

Selling, general and administrative

     762         626   
  

 

 

    

 

 

 

Total stock-based compensation expense

   $ 945       $ 713