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Subsequent Event
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12 Months Ended |
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Dec. 31, 2011
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| Subsequent Event [Abstract] | |
| Subsequent Event | 13. Subsequent Event In January 2012, the Company sold 13,333,334 shares of its common stock in a public offering at a price to the public of $3.75 per share. Net proceeds from the offering, after deducting underwriting discounts and commissions and other offering expenses payable by the Company, totaled $46.6 million. In February 2012, the Company sold an additional 576,358 shares pursuant to a partial exercise of the underwriters' overallotment option at a price to the public of $3.75 per share. Net proceeds from the overallotment option exercise, after deducting underwriting discounts and commissions and other offering expenses payable by the Company, totaled approximately $2.0 million. All of the shares of common stock were offered pursuant to two effective shelf registration statements. |

