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Common Stock (Details) (USD $)
 1 Months Ended 9 Months Ended
May 31, 2012
Jun. 30, 2009
Sep. 30, 2007
Sep. 30, 2012
Dec. 31, 2011
Dec. 29, 2011
Common Stock [Abstract]            
Common stock, par value (in dollars per share)       $ 0.01 $ 0.01 $ 0.01
Aggregate proceeds from sale of common stock under equity offering program, maximum           $ 39,750,000
Common stock sold through the program (in shares) 15,333,340 869,565 3,833,108 6,500,000    
Issuance of warrants to purchase common shares (in shares) 4,600,002          
Gross proceeds from issuance of common stock 21,500,000 3,000,000        
Proceeds from issuance of common stock 21,100,000 2,700,000 13,300,000 14,600,000    
Amount available under the program, assuming sufficient shares are available to be issued       $ 24,500,000