Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.1
Summary of Fair Value Warrant Derivative Liability and Related Common Shares (Detail) - USD ($)
Feb. 28, 2019
May 31, 2018
Sep. 15, 2016
Derivative [Line Items]      
Derivative liability $ 2,826,919    
Registered Direct Equity Offering | Investor Warrants Issued with Registered Direct Equity Offering      
Derivative [Line Items]      
Shares indexed 7,733,334 7,733,334 7,733,334
Derivative liability $ 793,866 $ 1,323,732 $ 5,179,200