Liabilities Measured At Fair Value on Recurring Basis by Level within Fair Value Hierarchy (Detail) - USD ($)		Nov. 30, 2018	May 31, 2018
Liabilities:
Derivative liability		$ 2,826,919
Total liabilities	[1]	3,075,142	$ 1,323,732
Convertible Note Redemption Provision
Liabilities:
Derivative liability	[1]	1,286,076
Warrants
Liabilities:
Derivative liability	[1]	1,789,066	1,323,732
Level 3
Liabilities:
Total liabilities	[1]	3,075,142	1,323,732
Level 3 | Convertible Note Redemption Provision
Liabilities:
Derivative liability	[1]	1,286,076
Level 3 | Warrants
Liabilities:
Derivative liability	[1]	$ 1,789,066	$ 1,323,732

[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 November 30, 2018 and May 31, 2018.