Annual report pursuant to Section 13 and 15(d)

Allocation of Cash Proceeds Derivative Liability at Its Fair Value and Warrant at Its Relative Fair Value, with Residual Allocation of Host AVCP Note Agreement (Detail)

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Allocation of Cash Proceeds Derivative Liability at Its Fair Value and Warrant at Its Relative Fair Value, with Residual Allocation of Host AVCP Note Agreement (Detail) - USD ($)
12 Months Ended
May 31, 2018
May 31, 2017
May 31, 2016
Debt Instrument [Line Items]      
Beginning Balance     $ 4,862,257
Amortization Debt Discount     94,344
Change in Fair Value $ (1,690,935) $ (2,164,533) (646,505)
Warrants (equity allocation)      
Debt Instrument [Line Items]      
Beginning Balance     215,732
Loss On Debt Extinguishment      
Debt Instrument [Line Items]      
Conversion     (584,177)
Compound Embedded Derivative      
Debt Instrument [Line Items]      
Beginning Balance     2,008,907
Change in Fair Value     (646,505)
Conversion     (1,362,402)
Common Stock Issued      
Debt Instrument [Line Items]      
Conversion     4,714,168
AVCP Convertible note payable      
Debt Instrument [Line Items]      
Beginning Balance     2,637,618
Amortization Debt Discount     94,344
Conversion     (2,731,962)
Accrued Unpaid Interest      
Debt Instrument [Line Items]      
Conversion     $ (35,627)