Annual report pursuant to Section 13 and 15(d)

Liability Measured at Fair Value on Recurring Basis by Level within Fair Value Hierarchy (Parenthetical) (Detail)

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Liability Measured at Fair Value on Recurring Basis by Level within Fair Value Hierarchy (Parenthetical) (Detail) - USD ($)
May 31, 2020
May 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities fair value [1] $ 0 $ 2,407,269
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets fair value 0 0
Liabilities fair value 0  
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets fair value 0 0
Liabilities fair value 0 0
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets fair value 0 0
Liabilities fair value [1] $ 0 $ 2,407,269
[1] The Company did not have any assets or liabilities measured at fair value using Level 1 or 2 of the fair value hierarchy as of May 31, 2020 and May 31, 2019. As of May 31, 2020, there were no longer any assets or liabilities measured at fair value using Level 3 inputs because all derivative warrants and convertible debt had been converted according to the terms of the agreements.