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Warrant Liability (Details Textual) (USD $)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended
Nov. 30, 2009
Nov. 30, 2008
Mar. 31, 2013
Mar. 31, 2012
Jun. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Mar. 31, 2013
Series A Warrants [Member]
Dec. 31, 2011
Series A Warrants [Member]
Nov. 30, 2009
Series B Warrant [Member]
Nov. 30, 2008
Series B Warrant [Member]
Mar. 31, 2013
Series B Warrant [Member]
Dec. 31, 2011
Series B Warrant [Member]
May 02, 2012
Series B Warrant [Member]
Warrant Liability (Textual) [Abstract]                            
Gross proceeds     $ 447,715 $ 728,623 $ 3,375,000     $ 468,000   $ 12,500,000 $ 20,000,000   $ 10,000,000  
Number of shares of common stock               2,198,571   0.40 0.75 334,534    
Exercise price 15.00 23.00                        
Warrants issued                   400,000 1,034,483      
Series A Warrants expiration               December 2016            
Warrants sold at public offering price                         1.25  
Exercise price of warrant                         1.25  
Exercise price of common stock                 $ 1.40          
Number of warrants issued                       2,700,000    
Number of units raised through public offering                         8,000,000  
Warrants issued     2,700,000         334,534            
Unissued warrant at the period end                           5,300,000
Warrant Liability (Additional Textual) [Abstract]                            
Number of shares of common stock in each unit sold to institutional investors   1                        
Number of warrants in each unit sold to institutional investors 1                          
Number of shares of common stock in each unit issued in public offering             1              
Number of series A warrants in each unit issued in public offering             1              
Number of common stock shares under one series A warrant issued in public offering             1              
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              
Number of units sold through public offering             8,000,000              
Number of Series A Warrants Issued           2,700,000                
Number of Series A Warrants Exercised           2,198,571