Quarterly report pursuant to Section 13 or 15(d)

Summary of Fair Value of Convertible Note Redemption Provision Derivative Liability (Detail)

v3.20.1
Summary of Fair Value of Convertible Note Redemption Provision Derivative Liability (Detail) - USD ($)
9 Months Ended
Feb. 29, 2020
Feb. 28, 2019
May 31, 2019
Net Proceeds $ 0 $ 15,460,000  
Convertible Note Redemption Provision Derivative Liability [Member]      
Derivative Liability     $ 2,005,137
Convertible Note Redemption Provision Derivative Liability [Member] | Inception date June 2018 Note, November 15, 2018 [Member]      
Net Proceeds 5,000,000    
Inception Date 1,284,988    
Derivative Liability     847,103
Convertible Note Redemption Provision Derivative Liability [Member] | Inception date January 2019 Note, January 30, 2019 [Member]      
Net Proceeds 5,000,000    
Inception Date $ 1,465,008    
Derivative Liability     $ 1,158,034