Annual report pursuant to Section 13 and 15(d)

Summary of ASC 480 Allocation of Proceeds of Offering (Detail)

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Summary of ASC 480 Allocation of Proceeds of Offering (Detail)
 12 Months Ended
May 31, 2018
USD ($)
Stockholders Equity Note [Line Items]  
Proceeds from issuance of common shares $ 8,990,000
Common Stock Including Additional Paid in Capital  
Stockholders Equity Note [Line Items]  
Proceeds from issuance of common shares 6,334,417
Warrants (equity allocation)  
Stockholders Equity Note [Line Items]  
Proceeds from issuance of common shares $ 2,655,583