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Warrant Liability (Details Textual) (USD $)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 31, 2012
May 02, 2012
Nov. 30, 2009
Nov. 30, 2008
Jun. 30, 2012
Jun. 30, 2012
Dec. 31, 2011
Warrant Liability (Textual) [Abstract]              
Gross proceeds $ 861,000 $ 5,300,000     $ 3,375,000 $ 3,194,202  
Exercise price     15.00 23.00   1.40  
Warrant Liability (Additional Textual) [Abstract]              
Units sold to institutional investors     1,000,000 1,379,310      
Price per unit sold to institutional investors     $ 12.50 $ 14.50      
Total proceeds, net of offering expenses and placement agency fees     11,985,000 18,637,000      
Date of issuance warrant             90th trading day
Series A Warrant [Member]
              
Warrant Liability (Textual) [Abstract]              
Number of shares of common stock           2,700,000  
Exercise price of common stock             1.40
Number of warrants exercised           615,000  
Warrants issued           2,700,000  
Series B Warrant [Member]
              
Warrant Liability (Textual) [Abstract]              
Gross proceeds   $ 5,300,000 $ 12,500,000 $ 20,000,000   $ 2,250,000 10,000,000
Number of shares of common stock     0.40 0.75   1,800,000  
Warrants issued     400,000 1,034,483      
Warrants sold at public offering price             1.25
Exercise price of warrant           1.40 1.25
Number of warrants exercised         1,800,000 2,700,000  
Number of units raised through public offering             8,000,000
Warrants issued           1,800,000