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Reconciliation of Liability Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3) (Detail) - USD ($)
12 Months Ended
May 31, 2017
May 31, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance   $ 2,008,907
Fair value adjustments $ (2,164,533) (646,505)
Ending Balance 3,014,667  
Conversion Features One    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Note conversion   (521,133)
Conversion Features Two    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Note conversion   $ (841,269)
Investor Warrants Issued with Registered Direct Equity Offering    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Warrants issued 4,360,000  
Placement Agent Warrants Issued with Registered Direct Equity Offering    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Warrants issued $ 819,200