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
Mar. 31, 2013
Mar. 31, 2012
Stock-based compensation expense related to stock-based awards    
Total stock-based compensation expense $ 1,793 $ 3,098
Research and development
   
Stock-based compensation expense related to stock-based awards    
Total stock-based compensation expense 1,023 1,712
General and administrative
   
Stock-based compensation expense related to stock-based awards    
Total stock-based compensation expense $ 770 $ 1,386