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Fair Value on Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Fair value of financial assets and liabilities    
Total financial assets $ 9,214 $ 8,970
Total financial liabilities 8,749 7,979
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
   
Fair value of financial assets and liabilities    
Total financial assets 9,214 8,683
Total financial liabilities 0 0
Significant Other Observable Inputs (Level 2) [Member]
   
Fair value of financial assets and liabilities    
Total financial assets 0 287
Total financial liabilities 0 0
Significant Unobservable Inputs (Level 3) [Member]
   
Fair value of financial assets and liabilities    
Total financial assets 0 0
Total financial liabilities 8,749 7,979
Money market funds [Member]
   
Fair value of financial assets and liabilities    
Total financial assets 9,214 8,683
Money market funds [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
   
Fair value of financial assets and liabilities    
Total financial assets 9,214 8,683
Money market funds [Member] | Significant Other Observable Inputs (Level 2) [Member]
   
Fair value of financial assets and liabilities    
Total financial assets 0 0
Money market funds [Member] | Significant Unobservable Inputs (Level 3) [Member]
   
Fair value of financial assets and liabilities    
Total financial assets 0 0
United States government agency securities [Member]
   
Fair value of financial assets and liabilities    
Total financial assets 0 287
United States government agency securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
   
Fair value of financial assets and liabilities    
Total financial assets 0 0
United States government agency securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
   
Fair value of financial assets and liabilities    
Total financial assets 0 287
United States government agency securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
   
Fair value of financial assets and liabilities    
Total financial assets 0 0
Warrant liability [Member]
   
Fair value of financial assets and liabilities    
Total financial liabilities 8,749 7,979
Warrant liability [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
   
Fair value of financial assets and liabilities    
Total financial liabilities 0 0
Warrant liability [Member] | Significant Other Observable Inputs (Level 2) [Member]
   
Fair value of financial assets and liabilities    
Total financial liabilities 0 0
Warrant liability [Member] | Significant Unobservable Inputs (Level 3) [Member]
   
Fair value of financial assets and liabilities    
Total financial liabilities $ 8,749 $ 7,979