Quarterly report pursuant to Section 13 or 15(d)

Stock Award Plans (Details)

v2.4.0.8
Stock Award Plans (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Stock-based compensation expense related to stock-based awards        
Total stock-based compensation expense $ 1,747 $ 3,011 $ 3,540 $ 6,109
Research and development
       
Stock-based compensation expense related to stock-based awards        
Total stock-based compensation expense 1,002 1,636 2,025 3,348
General and administrative
       
Stock-based compensation expense related to stock-based awards        
Total stock-based compensation expense $ 745 $ 1,375 $ 1,515 $ 2,761