Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.1
Liability Measured at Fair Value on Recurring Basis by Level within Fair Value Hierarchy (Detail) - USD ($)
Feb. 29, 2020
May 31, 2019
Liability:    
Total liability [1] $ 2,108,398 $ 2,407,269
warrants    
Liability:    
Derivative liability [1] 2,108,398 402,132
convertible note redemption provision    
Liability:    
Derivative liability [1]   2,005,137
Level 3    
Liability:    
Total liability [1] 2,108,398 2,407,269
Level 3 | warrants    
Liability:    
Derivative liability [1] $ 2,108,398 402,132
Level 3 | convertible note redemption provision    
Liability:    
Derivative liability [1]   $ 2,005,137
[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 February 29, 2020 and May 31, 2019.