Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Parenthetical)

v3.20.1
Consolidated Balance Sheets (Parenthetical) - $ / shares
Feb. 29, 2020
May 31, 2019
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares authorized 5,000,000 5,000,000
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 700,000,000 700,000,000
Common stock, shares issued 471,092,106 329,554,763
Common stock, shares outstanding 470,806,098 329,395,752
Treasury stock, shares 286,008 159,011
Treasury Stock    
Common stock, par value $ 0.001 $ 0.001
Series B Convertible Preferred Stock    
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares authorized 400,000 400,000
Preferred stock, shares issued 92,100 92,100
Preferred stock, shares outstanding 92,100 92,100
Series C Convertible Preferred Stock    
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares authorized 8,203 8,203
Preferred stock, shares issued 8,203 3,246
Preferred stock, shares outstanding 8.203 3.246
Series D Convertible Preferred Stock    
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares authorized 11,737 11,737
Preferred stock, shares issued 7,570 0
Preferred stock, shares outstanding 7,570 0