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Summary of Significant Accounting Policies (Details 3) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Net loss per common share      
Total shares excluded from calculation 2,989,949 2,587,516 2,901,948
Taxes recorded on items of other comprehensive income $ 0    
Stock options
      
Net loss per common share      
Total shares excluded from calculation 463,023 502,249 498,562
Restricted Stock and Restricted Stock Units
      
Net loss per common share      
Total shares excluded from calculation 39,377 38,089 8,555
Convertible preferred stock
      
Net loss per common share      
Total shares excluded from calculation 73,747 73,747 73,747
Contingently issuable common stock and common stock warrants associated with Economic Rights
      
Net loss per common share      
Total shares excluded from calculation 440,375    
Options issued in connection with the October 2010 financing
      
Net loss per common share      
Total shares excluded from calculation     891,771
Common stock warrants
      
Net loss per common share      
Total shares excluded from calculation 1,973,427 1,973,431 1,429,313