Liability Measured At Fair Value on Recurring Basis by Level within Fair Value Hierarchy (Detail) - USD ($)		Feb. 28, 2018	May 31, 2017
Liability:
Derivative liability	[1]	$ 3,288,799	$ 3,014,667
Total liability	[1]	3,288,799	3,014,667
Level 3
Liability:
Derivative liability	[1]	3,288,799	3,014,667
Total liability	[1]	$ 3,288,799	$ 3,014,667

[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 28, 2018 and May 31, 2017.