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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

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