Annual report pursuant to Section 13 and 15(d)

Consolidated Statements of Changes in Stockholders' (Deficit) Equity (Parenthetical)

v3.10.0.1
Consolidated Statements of Changes in Stockholders' (Deficit) Equity (Parenthetical) - $ / shares
 12 Months Ended
May 31, 2018
May 31, 2017
May 31, 2016
Proceeds from private equity offering, per share $ 0.50    
Proceeds from registered direct offering, per share 0.50 $ 0.75  
Warrants granted per share 0.50    
Private Equity Offering One      
Proceeds from private equity offering, per share     $ 0.75
Private Equity Offering Two      
Proceeds from private equity offering, per share   1.00 1.00
Conversion Features Two      
Common shares issued to extinguish promissory notes payable, convertible debt and related interest, per share     0.675
Conversion Features Four      
Common shares issued to extinguish promissory notes payable, convertible debt and related interest, per share     0.75
Exercise Price 1      
Warrants granted per share   0.50 0.50
Exercise Price 2      
Warrants granted per share   0.75 0.75
Common Stock      
Proceeds from private equity offering, per share 0.50    
Proceeds from registered direct offering, per share 0.50 0.75  
Warrants granted per share $ 0.50    
Common Stock | Private Equity Offering One      
Proceeds from private equity offering, per share     0.75
Common Stock | Private Equity Offering Two      
Proceeds from private equity offering, per share   1.00 1.00
Common Stock | Exercise Price 1      
Warrants granted per share   0.50 0.50
Common Stock | Exercise Price 2      
Warrants granted per share   0.75 0.75
Series B Convertible Preferred Stock      
Proceeds from private equity offering, per share   0.50  
Series B Convertible Preferred Stock | Preferred Stock      
Proceeds from private equity offering, per share   0.50  
Series B Convertible Preferred Stock | Common Stock      
Proceeds from private equity offering, per share   $ 0.50  
Maximum      
Common shares issued to extinguish promissory notes payable, convertible debt and related interest, per share     0.75
Maximum | Additional Paid-in Capital      
Common shares issued to extinguish promissory notes payable, convertible debt and related interest, per share     0.75
Minimum      
Common shares issued to extinguish promissory notes payable, convertible debt and related interest, per share     0.675
Minimum | Additional Paid-in Capital      
Common shares issued to extinguish promissory notes payable, convertible debt and related interest, per share     $ 0.675