Quarterly report pursuant to Section 13 or 15(d)

Summary of Fair Value Warrant Derivative Liability and Related Common Shares (Detail)

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Summary of Fair Value Warrant Derivative Liability and Related Common Shares (Detail) - Registered Direct Equity Offering - Investor Warrants Issued with Registered Direct Equity Offering - USD ($)
Aug. 31, 2019
May 31, 2019
Sep. 15, 2016
Derivative [Line Items]      
Shares indexed 7,733,334 7,733,334 7,733,334
Derivative liability $ 339,172 $ 402,132 $ 5,179,200