Annual report pursuant to Section 13 and 15(d)

License Agreements - Additional Information (Detail)

v3.20.2
License Agreements - Additional Information (Detail)
May 31, 2020
USD ($)
May 31, 2019
USD ($)
Apr. 15, 2019
USD ($)
Apr. 15, 2019
GBP (£)
Licenses Agreements [Line Items]        
Accrued license fee $ 12,500 $ 208,600 $ 741,000 £ 600,000
prepaid asset $ 100,000      
Accrued liability   $ 160,000    
Minimum        
Licenses Agreements [Line Items]        
Royalty on every net sales 0.75%      
Maximum        
Licenses Agreements [Line Items]        
Royalty on every net sales 2.00%