Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Parenthetical)

v3.22.1
Consolidated Balance Sheets (Parenthetical) - $ / shares
shares in Thousands
Feb. 28, 2022
May 31, 2021
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares authorized 5,000 5,000
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 1,000,000 1,000,000
Common stock, shares issued 713,730 626,123
Common stock, shares outstanding 713,287 625,680
Treasury stock, shares 443 443
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 400 400
Preferred stock, shares issued 19 79
Preferred stock, shares outstanding 19 79
Series C Convertible Preferred Stock    
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares authorized 8 8
Preferred stock, shares issued 7 8
Preferred stock, shares outstanding 7 8
Series D Convertible Preferred Stock    
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares authorized 12 12
Preferred stock, shares issued 9 9
Preferred stock, shares outstanding 9 9