Quarterly report pursuant to Section 13 or 15(d)

Stock Plans (Details)

v2.4.0.6
Stock Plans (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Summary of share-based compensation expense recorded for awards under the stock option plans        
Total stock-based compensation expenses $ 365 $ 239 $ 2,233 $ 808
Research and development [Member]
       
Summary of share-based compensation expense recorded for awards under the stock option plans        
Total stock-based compensation expenses 148 70 878 229
General and administrative [Member]
       
Summary of share-based compensation expense recorded for awards under the stock option plans        
Total stock-based compensation expenses $ 217 $ 169 $ 1,355 $ 579