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Share-based Compensation (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 129 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Non-cash, share-based compensation expense          
Total expenses $ 74 $ 79 $ 243 $ 232 $ 2,525
Research and Development [Member]
         
Non-cash, share-based compensation expense          
Total expenses 25 30 76 90 572
Selling, General and Administrative [Member]
         
Non-cash, share-based compensation expense          
Total expenses 49 49 167 142 1,566
Restructuring [Member]
         
Non-cash, share-based compensation expense          
Total expenses             $ 387