Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Parenthetical)

v3.10.0.1
Consolidated Balance Sheets (Parenthetical) - $ / shares
Nov. 30, 2018
May 31, 2018
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 600,000,000 375,000,000
Common stock, shares issued 290,808,960 216,881,790
Common stock, shares outstanding 290,649,949 216,722,779
Treasury stock, shares 159,011 159,011
Treasury Stock    
Common stock, par value $ 0.001 $ 0.001
Series B Convertible Preferred Stock    
Series B Convertible preferred stock, par value $ 0.001 $ 0.001
Series B Convertible preferred stock, shares authorized 400,000 400,000
Series B Convertible preferred stock, shares issued 92,100 92,100
Series B Convertible preferred stock, shares outstanding 92,100 92,100