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Stockholders' Equity (Details) (USD $) | 3 Months Ended
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Mar. 31, 2013
Stockholders' Equity |
Common stock issued (in shares) | 13,800,000
Net proceeds from sale of common stock | $ 114,187,000
Net proceeds from sale of stock in an underwritten public offering | 97,000,000
Cantor Amendment |
Stockholders' Equity |
Common stock issued (in shares) | 2,433,608
Net proceeds from sale of common stock | $ 17,100,000

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