Quarterly report pursuant to Section 13 or 15(d)

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

v3.21.2
Stockholders’ Equity (Details) - Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range - $ / shares
 3 Months Ended 12 Months Ended
May 31, 2020
Aug. 31, 2021
May 31, 2021
Jul. 17, 2021
May 30, 2020
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]          
Exercise Price       $ 1.10  
Number of warrants outstanding (in Shares)   40,090,978 53,997,645   54,835,145
Weighted average remaining contractual life   2 months 15 days      
Weighted average exercise price of outstanding warrants $ 0.53 $ 0.50 $ 0.50    
Number of warrants exercisable (in Shares)   40,090,978      
Weighted average exercise price of exercisable warrants   $ 0.50      
Warrants Exercisable at $0.41 [Member]          
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]          
Exercise Price   $ 0.41      
Number of warrants outstanding (in Shares)   468,333      
Weighted average remaining contractual life   1 year 2 months 1 day      
Weighted average exercise price of outstanding warrants   $ 0.41      
Number of warrants exercisable (in Shares)   468,333      
Weighted average exercise price of exercisable warrants   $ 0.41      
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   1 month 13 days      
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 months 26 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)   3,125,000      
Weighted average remaining contractual life   1 year 7 days      
Weighted average exercise price of outstanding warrants   $ 0.60      
Number of warrants exercisable (in Shares)   3,125,000      
Weighted average exercise price of exercisable warrants   $ 0.60      
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)   296,035      
Weighted average remaining contractual life   4 months 2 days      
Weighted average exercise price of outstanding warrants   $ 1.10      
Number of warrants exercisable (in Shares)   296,035      
Weighted average exercise price of exercisable warrants   $ 1.10