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, 2018
May 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities fair value [1] $ 1,323,732 $ 3,014,667
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets fair value 0 0
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Liabilities fair value $ 0 $ 0
[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, 2018 and May 31, 2017.