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Subsequent Events (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended | 197 Months Ended |  | 0 Months Ended | 12 Months Ended | 185 Months Ended |  | 12 Months Ended | 0 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2010 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 14, 2012 Aspire Capital Fund, LLC | Dec. 31, 2010 Preferred stock | Dec. 31, 2011 Preferred stock | Dec. 31, 2012 Preferred stock | Dec. 31, 2010 Common stock | Jan. 11, 2013 Subsequent event Preferred stock | Mar. 31, 2013 Subsequent event Preferred stock item | Mar. 31, 2013 Subsequent event Common stock | Mar. 31, 2013 Subsequent event Common stock Aspire Capital Fund, LLC
Subsequent events |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividend declared per share (in dollars per share) |  |  |  |  |  |  |  |  |  | $ 0.15 |  |  |
Number of securities exchange agreements |  |  |  |  |  |  |  |  |  |  | 3 |  |
Number of shares issued upon conversion |  |  |  |  |  |  |  |  | 236,514 |  |  | 1,513,653 |
Preferred shares exchanged (in shares) |  |  |  |  |  | 833,671 | 1,776,858 |  |  |  | 792,460 |  |
Preferred stock, shares outstanding | 1,213,142 |  | 1,213,142 | 1,213,142 |  |  |  | 1,213,142 |  |  | 420,862 |  |
Excess number of shares issued upon conversion |  |  |  |  |  |  |  |  |  |  |  | 1,465,480 |
Deemed dividend |  | $ 3,515 | $ 3,515 |  |  |  |  |  |  |  | $ 8,400 |  |
Number of shares issued under purchase agreement |  |  |  |  | 158,982 |  |  |  |  |  |  |  | 650,000
Purchase price for shares issued under purchase agreement | $ 1,418 |  |  |  | $ 1,000 |  |  |  |  |  |  |  | $ 3,400

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