Liability Measured At Fair Value on Recurring Basis by Level within Fair Value Hierarchy (Detail) - USD ($)	Aug. 31, 2017	[1]	May 31, 2017
Liability:
Derivative liability	$ 3,377,333		$ 3,014,667
Total liability	3,377,333		3,014,667
Level 3
Liability:
Derivative liability	3,377,333		3,014,667
Total liability	$ 3,377,333		$ 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 August 31, 2017, and May 31, 2017.