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Stockholders' Equity (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 9 Months Ended |  | 1 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 31, 2008 | Sep. 30, 2013 | Dec. 31, 2012 | Sep. 30, 2013 Second Public Offering [Member] | Sep. 30, 2013 Minimum [Member] | Sep. 30, 2013 Maximum [Member]
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Common stock authorized for issuance under prior shelf registration statement with SEC, dollar amount |  |  |  |  |  | $ 50,000
Common stock, shares authorized |  | 300,000,000 | 200,000,000 |  |  |
Sales per share price range |  |  |  | $ 3.14 |  |
Shares sold | 6,686,650 | 12,600,000 |  | 31,846,950 |  |
Proceeds from shares sold |  | $ 34,000 |  | $ 94,700 |  |
Common stock issued upon exercise in full over-allotment granted |  |  |  | 4,153,950 |  |
Sales per share price range | $ 2.68 |  |  |  | $ 2.06 | $ 3.38

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