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Subsequent Events (Details) (USD $) | 1 Months Ended | 12 Months Ended |  |  | 0 Months Ended | 2 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
May 31, 2012 | Jul. 31, 2011 | Jun. 30, 2009 | Dec. 31, 2008 | Dec. 31, 2013 | Dec. 31, 2012 | Feb. 24, 2014 Minimum [Member] | Feb. 24, 2014 Maximum [Member] | Feb. 28, 2013 Subsequent Event [Member] Sales Agreement [Member] | Mar. 11, 2013 Subsequent Event [Member] Sales Agreement [Member]
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock sold through the program (in shares) | 15,300,000 | 5,000,000 | 900,000 | 3,900,000 |  |  |  |  | 16,000,000 |
Proceeds from issuance of common stock |  | $ 23,500,000 |  |  |  |  |  |  | $ 4,400,000 |
Remaining value of common stock |  |  |  |  | $ 1,343,000 | $ 768,000 |  |  |  | $ 40,400,000
Reverse stock split ratio |  |  |  |  |  |  | 0.0625 | 0.125 |  |

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