Quarterly report pursuant to Section 13 or 15(d)

Stock Plans (Details)

v2.4.0.8
Stock 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
Summary of share-based compensation expense recorded for awards under the stock option plans        
Total stock-based compensation expenses $ 130 $ 316 $ 635 $ 1,868
Research and development [Member]
       
Summary of share-based compensation expense recorded for awards under the stock option plans        
Total stock-based compensation expenses 52 114 356 730
General and administrative [Member]
       
Summary of share-based compensation expense recorded for awards under the stock option plans        
Total stock-based compensation expenses $ 78 $ 202 $ 279 $ 1,138