Quarterly report pursuant to Section 13 or 15(d)

Warrant Liability (Details Textual)

v2.4.0.8
Warrant Liability (Details Textual) (USD $)
 6 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended 2 Months Ended 6 Months Ended 1 Months Ended 2 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Apr. 09, 2012
Mar. 15, 2011
Mar. 31, 2013
Series A Warrants [Member]
Jun. 30, 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]
Jun. 30, 2013
Series B Warrants [Member]
Apr. 09, 2012
Series B Warrants [Member]
Mar. 15, 2011
Deerfield Warrant [Member]
Mar. 31, 2013
Deerfield Warrant [Member]
Jun. 30, 2013
Deerfield Warrant [Member]
Apr. 30, 2012
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      
Exercise price of warrant per share       1.57     1.15         0.85       1.25
Expiration date of Deerfield warrant                             Mar. 15, 2017  
Deerfield warrants 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 shares issued on exercise of warrants         1,109,010     5,761,765   5,761,765            
Gross proceeds $ 1,275,000        $ 1,275,000     $ 3,934,000 $ 964,000              
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     6,517,648