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Common Stock (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 1 Months Ended |  |  | 3 Months Ended |  | 1 Months Ended | 6 Months Ended | 12 Months Ended
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May 31, 2012 | Jun. 30, 2009 | Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2013 2012 Warrants [Member] | Jun. 30, 2013 Cowen and Company, LLC [Member] | Mar. 13, 2013 Cowen and Company, LLC [Member] | Dec. 31, 2012 Terrapin Opportunity, L.P. [Member] | Jun. 30, 2013 Terrapin Opportunity, L.P. [Member] | Dec. 31, 2012 Terrapin Opportunity, L.P. [Member]
Amount to be purchased by party under agreement |  |  |  |  |  |  |  |  |  | $ 35,000,000
Term of purchase agreement |  |  |  |  |  |  |  |  |  | 24 months
Common stock sold through the program (in shares) | 15.3 | 0.9 |  |  |  | 14.2 |  |  | 5.6 |
Gross proceeds from issuance of common stock | 21,500,000 | 3,000,000 |  |  |  |  |  | 2,100,000 | 9,000,000 |
Proceeds from issuance of common stock | 21,100,000 | 2,700,000 |  |  | 200,000 | 20,900,000 |  |  | 8,900,000 |
Amount available under the program, assuming sufficient shares are available to be issued |  |  |  |  |  |  |  |  | 23,900,000 |
Common stock, par value under sales agreement (in dollars per share) |  |  | $ 0.01 | $ 0.01 |  |  | $ 0.01 |  |  |
Aggregate proceeds from sale of common stock under equity offering program, maximum |  |  |  |  |  |  | 50,000,000 |  |  |
Warrants issued (in shares) |  |  |  |  | 0.2 |  |  |  |  |
Proceeds of common stock issued, net of related expenses |  |  |  |  |  | $ 20,800,000 |  |  |  |

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