Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Deficit (Details)

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Stockholders' Deficit (Details) (USD $)
1 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 1 Months Ended 2 Months Ended 1 Months Ended
Sep. 30, 2012
Mar. 31, 2013
Apr. 30, 2013
Dec. 31, 2012
Apr. 09, 2012
Mar. 15, 2011
Dec. 31, 2012
Accrued Liabilities [Member]
Mar. 31, 2013
Series A Warrants [Member]
Apr. 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]
Apr. 30, 2013
Series B Warrants [Member]
Apr. 09, 2012
Series B Warrants [Member]
Mar. 31, 2013
Deerfield Warrant [Member]
Apr. 30, 2013
Deerfield Warrant [Member]
Mar. 15, 2011
Deerfield Warrant [Member]
Apr. 30, 2012
Institutional Investor [Member]
Stockholders' Deficit (Textual) [Abstract]                                    
Number of common stock issued upon exercise of warrants               1,109,010     4,627,941 1,133,824            
Gross proceeds   $ 1,275,000           $ 1,275,000     $ 3,934,000 $ 964,000            
Class of warrant or right exercised                             6,000,000      
Deerfield exercise reduction of our outstanding indebtedness                             7,500,000      
Premium allocated to fair value option agreement             1,700,000                      
Purchase and sale of warrants of common stock under subscription agreement                 6,517,678       6,517,678          
Gross proceeds from sale of institutional investor                                   5,540,000
Exercise price of warrant per share           1.57       1.15       0.85   1.25 1.25  
Stockholders' Deficit (Additional Textual) [Abstract]                                    
Number of common stock sold 3,400,000                                  
Purchase price of sold common stock 4,250,000                                  
Per share price of sold common stock $ 1.25                                  
Allocated to fair value option agreement       $ 0.50                            
Purchase and sale of shares of common stock under subscription agreements     6,517,678   6,517,648                          
Payment of stock issuance costs   500,000                                
Fair value of warrants   $ 2,900,000