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Stock-based Compensation (Details 3) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 144 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Non-cash, share-based compensation expense      
Total expenses $ 283 $ 306 $ 2,871
Research and Development
      
Non-cash, share-based compensation expense      
Total expenses 77 94 667
Selling, General and Administrative
      
Non-cash, share-based compensation expense      
Total expenses 206 212 1,817
Restructuring Expense
      
Non-cash, share-based compensation expense      
Total expenses     $ 387