Annual report pursuant to Section 13 and 15(d)

Stock Plans (Details 3)

v2.4.0.6
Stock Plans (Details 3) (USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summary of share-based compensation expense recorded for awards under the stock option plans      
Total stock-based compensation expenses $ 2,581 $ 1,177 $ 733
Increase in basic and diluted net loss per share $ (0.04) $ (0.02) $ (0.01)
Research and development [Member]
     
Summary of share-based compensation expense recorded for awards under the stock option plans      
Total stock-based compensation expenses 1,560 371 202
General and administrative [Member]
     
Summary of share-based compensation expense recorded for awards under the stock option plans      
Total stock-based compensation expenses $ 1,021 $ 806 $ 531