Quarterly report pursuant to Section 13 or 15(d)

Derivative Liability - Additional Information (Detail)

v3.19.1
Derivative Liability - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Feb. 28, 2019
Feb. 28, 2018
Feb. 28, 2019
Feb. 28, 2018
Derivative [Line Items]        
Change in fair value of derivative liability $ 1,347,907 $ (741,066) $ 881,495 $ (274,132)
Percentage Of Outstanding Common Stock To Be Acquired     50.00%  
Warrant [Member]        
Derivative [Line Items]        
Change in fair value of derivative liability     $ 530,000 $ 274,000