Annual report pursuant to Section 13 and 15(d)

Activity Related to Notes (Detail)

v3.5.0.2
Activity Related to Notes (Detail) - USD ($)
12 Months Ended
May 31, 2016
May 31, 2015
2013 Convertible Notes    
Debt Instrument [Line Items]    
Face amount of Notes $ 50,000 $ 4,271,250
Unamortized discount   (6,529)
Conversions (50,000) (4,221,250)
Total carrying value of Notes   43,471
Short-Term Convertible Notes    
Debt Instrument [Line Items]    
Face amount of Notes 3,981,050 3,981,050
Unamortized discount   (2,390,063)
Conversions (525,000)  
Payments upon maturity (762,250)  
Total carrying value of Notes   $ 1,590,987
Short-Term Convertible Notes | Tender Offer    
Debt Instrument [Line Items]    
Conversions $ (2,693,800)