Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation (Details)

v2.4.0.8
Stock-based Compensation (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Stock-based compensation expense related to share-based payments    
Total stock-based compensation expense $ 2,364 $ 1,793
Research and development
   
Stock-based compensation expense related to share-based payments    
Total stock-based compensation expense 1,314 1,023
General and administrative
   
Stock-based compensation expense related to share-based payments    
Total stock-based compensation expense $ 1,050 $ 770