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Fair Value (Details 2) (Warrants, USD $)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Feb. 28, 2007
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Warrants
               
Fair value measurements                
Fair value of the warrants $ 6,800,000           $ 51,000 $ 700,000  
Warrants Liability                
Exercise price (in dollars per share)           $ 59.08 $ 59.08  
Expected term       1 year 4 months 17 days   2 years 1 month 17 days 3 years 1 month 17 days  
Risk free interest rate (as a percent) 4.68%         0.25% 1.02%  
Expected volatility (as a percent) 85.00%         106.00% 121.00%  
Expected dividend yield over expected term (as a percent) 0.00%         0.00%    
Contractual life 7 years              
Change in valuation of liability   $ 1,000 $ 400,000 $ 51,000 $ 600,000 $ 629,000 $ (300,000) $ (300,000)