Annual report pursuant to section 13 and 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v2.4.0.8
Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 7 Months Ended 12 Months Ended 115 Months Ended
May 31, 2004
May 31, 2013
May 31, 2012
May 31, 2011
May 31, 2010
May 31, 2009
May 31, 2008
May 31, 2007
May 31, 2006
May 31, 2005
May 31, 2013
Class of Stock [Line Items]                      
Net loss $ 345,914 $ 9,568,301 $ 7,474,224 $ 3,719,688 $ 3,359,865 $ 1,306,004 $ 1,193,684 $ 2,610,070 $ 2,053,944 $ 777,083 $ 32,400,907
Accumulated deficit   34,002,819                 34,002,819
Working capital deficit   2,388,138                 2,388,138
Estimated future unvested option forfeitures   0.00%                  
Preferred Stock Shares authorized to be issued   5,000,000                 5,000,000
Deferred offering costs   96,930 677,327               96,930
Common stock options and warrants to purchase   95,100 98,900               95,100
Common stock options and warrants to purchase   18,146,938 10,327,664               18,146,938
Face amount of notes   6,588,250                 6,588,250
Additional common shares if convertible debt is converted to common stock   8,106,282                  
Unrecognized benefits   0 0               0
Minimum
                      
Class of Stock [Line Items]                      
Fixed conversion prices range   $ 0.65                 $ 0.65
Maximum
                      
Class of Stock [Line Items]                      
Fixed conversion prices range   $ 0.75                 $ 0.75
Convertible Debt
                      
Class of Stock [Line Items]                      
Face amount of notes   $ 6,021,250                 $ 6,021,250
Series B convertible preferred stock
                      
Class of Stock [Line Items]                      
Common stock options and warrants to purchase   95,100                 95,100
Common shares issued upon conversion of preferred stock   951,000                  
Series B Convertible Preferred Stock
                      
Class of Stock [Line Items]                      
Preferred Stock Shares authorized to be issued   400,000 400,000               400,000