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Stockholders' Equity (Details) (USD $) | 6 Months Ended |  | 6 Months Ended |  | 1 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Jun. 30, 2012 Cantor Agreement | Jan. 31, 2011 Cantor Agreement | Sep. 30, 2012 Cantor Amendment | Jun. 30, 2013 Cantor Amendment
Stockholders' Equity |  |  |  |  |  |  |
Common stock issued (in shares) | 80,977,696 |  | 64,359,513 | 2,450,000 |  |  | 2,433,608
Common stock available for sale (in shares) |  |  |  |  | 5,000,000 |  |
Net proceeds from sale of common stock | $ 114,187,000 | $ 51,957,000 |  | $ 8,500,000 |  |  | $ 17,100,000
Aggregate offering price of additional shares which the entity can issue as per amended agreement |  |  |  |  |  | 44,000,000 | 4,400,000
Fixed commission rate (as a percent) |  |  |  |  |  | 3.00% |
Notice period for termination of agreement |  |  |  |  |  | 10 days |
Common stock in an underwritten public offering issued (in shares) | 13,800,000 | 12,075,000 |  |  |  |  |
Shares issued on exercise of over-allotment option by underwriters (in shares) | 1,800,000 | 1,575,000 |  |  |  |  |
Net proceeds from sale of stock in an underwritten public offering | $ 97,000,000 | $ 43,400,000 |  |  |  |  |

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