Quarterly report pursuant to Section 13 or 15(d)

Warrant Liability (Details Textual)

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Warrant Liability (Details Textual) (USD $)
 3 Months Ended 3 Months Ended 1 Months Ended 2 Months Ended 3 Months Ended 1 Months Ended 2 Months Ended 3 Months Ended
Mar. 31, 2013
Apr. 30, 2013
Apr. 09, 2012
Mar. 15, 2011
Mar. 31, 2013
Series A Warrants [Member]
Apr. 09, 2012
Series A Warrants [Member]
Oct. 31, 2012
Series B Warrants [Member]
Sep. 30, 2012
Series B Warrants [Member]
Oct. 31, 2012
Series B Warrants [Member]
Mar. 31, 2013
Series B Warrants [Member]
Apr. 09, 2012
Series B Warrants [Member]
Mar. 15, 2011
Deerfield Warrant [Member]
Mar. 31, 2013
Deerfield Warrant [Member]
Mar. 31, 2013
Deerfield Warrant [Member]
Apr. 30, 2013
Deerfield Warrant [Member]
Warrant Liability (Textual) [Abstract]                              
Deerfield six-year warrants to purchase common stock shares                       6,000,000      
Initial Exercise price of common stock shares                       $ 1.57      
Exercisable and expiration date of Deerfield warrant                           Mar. 15, 2017  
Class of warrant or right exercised                         6,000,000    
Deerfield exercise reduction of our outstanding indebtedness                         $ 7,500,000    
Six-year warrants to purchase shares of common stock           6,517,648                  
Six month warrants to purchase shares of common stock                     6,517,648        
Number of common stock         1,109,010   5,761,765   5,761,765            
Gross proceeds $ 1,275,000       $ 1,275,000   $ 3,934,000 $ 964,000              
Exercise price of warrant per share       1.57   1.15         0.85 1.25     1.25
Stock exercised price                 $ 0.85            
Series B Warrants, Expired         5,408,638   755,883   755,883            
Common stock expiration period         2018-04         2012-10          
Warrant Liability (Additional Textual) [Abstract]                              
Purchase and sale of shares of common stock under subscription agreements   6,517,678 6,517,648