Quarterly report pursuant to Section 13 or 15(d)

Convertible Instruments and Accrued Interest - Preferred stock (Details)

v3.24.3
Convertible Instruments and Accrued Interest - Preferred stock (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Aug. 31, 2024
USD ($)
$ / shares
shares
May 31, 2024
USD ($)
$ / shares
shares
Class of Stock    
Accrued dividends | $ $ 7,163 $ 6,791
Preferred stock, par value | $ / shares $ 0.001 $ 0.001
Accumulated deficit | $ $ (872,304) $ (891,531)
Series B Convertible Preferred Stock    
Class of Stock    
Shares of preferred stock 19 19
Common stock conversion rate 10 10
Total shares of common stock if converted 190 190
Undeclared dividend | $ $ 21 $ 19
Total shares of common stock if dividends converted 42 38
Preferred stock, liquidation preference per share ($ per share) | $ / shares $ 5.00  
Preferred stock, par value | $ / shares $ 0.001 $ 0.001
Series C Convertible Preferred Stock    
Class of Stock    
Shares of preferred stock 6 6
Common stock conversion rate 2,000 2,000
Total shares of common stock if converted 12,670 12,670
Accrued dividends | $ $ 3,295 $ 3,135
Total shares of common stock if dividends converted 6,590 6,270
Preferred stock, par value | $ / shares $ 0.001 $ 0.001
Series D Convertible Preferred Stock    
Class of Stock    
Shares of preferred stock 9 9
Common stock conversion rate 1,250 1,250
Total shares of common stock if converted 10,565 10,565
Accrued dividends | $ $ 3,868 $ 3,656
Total shares of common stock if dividends converted 7,736 7,312
Preferred stock, par value | $ / shares $ 0.001 $ 0.001
Series C and Series D Convertible Preferred Stock    
Class of Stock    
Preferred stock, liquidation preference per share ($ per share) | $ / shares $ 1,000