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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 3 Months Ended 12 Months Ended
May 31, 2012
Jun. 30, 2009
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
2012 Warrants [Member]
Mar. 31, 2013
Cowen and Company, LLC [Member]
Mar. 13, 2013
Cowen and Company, LLC [Member]
Mar. 31, 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           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