Quarterly report pursuant to Section 13 or 15(d)

Stock Award Plans (Details)

v2.4.0.6
Stock Award Plans (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Stock-based compensation expense related to stock-based awards        
Total stock-based compensation expense $ 3,011 $ 3,200 $ 6,109 $ 7,037
Research and development
       
Stock-based compensation expense related to stock-based awards        
Total stock-based compensation expense 1,636 2,337 3,348 4,850
General and administrative
       
Stock-based compensation expense related to stock-based awards        
Total stock-based compensation expense $ 1,375 $ 863 $ 2,761 $ 2,187