Annual report pursuant to Section 13 and 15(d)

Net Deferred Tax Assets and Liabilities (Detail)

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Net Deferred Tax Assets and Liabilities (Detail) - USD ($)
May. 31, 2015
May. 31, 2014
Schedule Of Income Taxes [Line Items]    
Accrued expenses $ 219,100 $ 159,300
Debt discount and amortization 0 0
Valuation allowance (219,100) (159,300)
Deferred Tax Assets, Net, Current, Total 0 0
Net operating loss 16,857,600 9,957,400
Debt discount (902,700) (663,700)
Expense on non-qualified stock options 3,073,500 2,893,300
Other 211,700 176,200
Valuation allowance (19,240,100) 12,363,200
Deferred Tax Assets, Net, Noncurrent, Total $ 0 $ 0