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Reconciliation of Federal Statutory Income Tax Rate of 34 Percent to Effective Income Tax Rate (Detail)

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Reconciliation of Federal Statutory Income Tax Rate of 34 Percent to Effective Income Tax Rate (Detail)
12 Months Ended
May. 31, 2015
May. 31, 2014
Schedule Of Income Taxes [Line Items]    
Income tax provision at statutory rate 34.00% 34.00%
State income taxes, net 0.00% 0.40%
Rate change (0.60%) (9.60%)
Derivative gain/loss (1.20%)  
Valuation allowance (32.20%) (24.80%)
Total 0.00% 0.00%