Annual report pursuant to Section 13 and 15(d)

Summary of Cash Proceeds of Offering (Detail)

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Summary of Cash Proceeds of Offering (Detail)
12 Months Ended
May 31, 2018
USD ($)
Stockholders Equity Note [Line Items]  
Gross proceeds from sale of common stock $ 10,000,000
Placement agent fees and expenses 1,010,000
Total net proceeds $ 8,990,000