Annual report pursuant to Section 13 and 15(d)

STOCKHOLDERS??? EQUITY (Details) - Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range

v3.19.2
STOCKHOLDERS’ EQUITY (Details) - Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range - $ / shares
12 Months Ended
May 31, 2017
May 31, 2019
May 31, 2018
Nov. 14, 2018
Sep. 06, 2018
Aug. 14, 2018
May 30, 2017
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]              
Exercise Price       $ 0.75 $ 0.75 $ 0.75  
Number of warrants outstanding (in Shares)   54,818,985 4,495,750       0
Weighted average remaining contractual life   2 years 6 months          
Weighted average exercise price of outstanding warrants $ 0 $ 0.53 $ 0.61        
Number of warrants exercisable (in Shares)   54,818,985          
Weighted average exercise price of exercisable warrants   $ 0.53          
Warrant Exercisable at $0.49 [Member]              
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]              
Exercise Price   $ 0.49          
Number of warrants outstanding (in Shares)   33,465,110          
Weighted average remaining contractual life   2 years 6 months          
Weighted average exercise price of outstanding warrants   $ 0.49          
Number of warrants exercisable (in Shares)   33,465,110          
Weighted average exercise price of exercisable warrants   $ 0.49          
Warrants Exercisable at $0.50 [Member]              
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]              
Exercise Price   $ 0.50          
Number of warrants outstanding (in Shares)   2,736,500          
Weighted average remaining contractual life   2 years 266 days          
Weighted average exercise price of outstanding warrants   $ 0.50          
Number of warrants exercisable (in Shares)   2,736,500          
Weighted average exercise price of exercisable warrants   $ 0.50          
Warrant Exercisable at $0.60 [Member]              
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]              
Exercise Price   $ 0.60          
Number of warrants outstanding (in Shares)   17,500,000          
Weighted average remaining contractual life   2 years 6 months          
Weighted average exercise price of outstanding warrants   $ 0.60          
Number of warrants exercisable (in Shares)   17,500,000          
Weighted average exercise price of exercisable warrants   $ 0.60          
Warrant Exercisable at $0.75 [Member]              
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]              
Exercise Price   $ 0.75          
Number of warrants outstanding (in Shares)   837,500          
Weighted average remaining contractual life   1 year 266 days          
Weighted average exercise price of outstanding warrants   $ 0.75          
Number of warrants exercisable (in Shares)   837,500          
Weighted average exercise price of exercisable warrants   $ 0.75          
Warrant Exercisable at $1.10 [Member]              
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]              
Exercise Price   $ 1.10          
Number of warrants outstanding (in Shares)   279,875          
Weighted average remaining contractual life   2 years 197 days          
Weighted average exercise price of outstanding warrants   $ 1.10          
Number of warrants exercisable (in Shares)   279,875          
Weighted average exercise price of exercisable warrants   $ 1.10