Annual report [Section 13 and 15(d), not S-K Item 405]

Consolidated Statements of Stockholders' Deficit

v3.26.1
Consolidated Statements of Stockholders' Deficit - USD ($)
shares in Thousands, $ in Thousands
Total
Preferred stock
Common stock
Treasury stock
Additional paid-in capital
Accumulated deficit
Beginning balance at May. 31, 2024 $ (116,758)   $ 1,059   $ 773,714 $ (891,531)
Beginning balance (shares) at May. 31, 2024   34 1,059,002      
Beginning balance treasury stock (shares) at May. 31, 2024       443    
Issuance of stock for convertible note repayment 4,093   $ 25   4,068  
Issuance of stock for convertible note repayment (in shares)     25,431      
Loss on induced conversion 1,180       1,180  
Stock option exercises 106   $ 1   105  
Stock option exercises (in shares)     500      
Stock issued for compensation 100       100  
Stock issued for compensation (in shares)     435      
Stock issued for tender offer 14,026   $ 153   13,873  
Stock issued for tender offer (in shares)     152,505      
Offering costs related to stock issuance (3,649)       (3,649)  
Stock adjustment     $ (1)   1  
Stock adjustment (in shares)     (651) (157)    
Warrant exercises 1,081   $ 12   1,069  
Warrant exercises (in shares)     12,238      
Preferred stock dividends accrued and paid in common stock upon conversion (1,478)       (1,478)  
Stock-based compensation 1,512       1,512  
Net Income (Loss) 3,745         3,745
Ending balance at May. 31, 2025 $ (96,042)   $ 1,249   790,495 (887,786)
Ending balance (shares) at May. 31, 2025   34 1,249,460      
Ending balance treasury stock (shares) at May. 31, 2025 286     286    
Issuance of stock for convertible note repayment $ 9,500   $ 33   9,467  
Issuance of stock for convertible note repayment (in shares)     32,566      
Conversion of Series C preferred stock to common stock (in shares)     280      
Stock issued for tender offer (in shares) 3,200   85,693      
Stock option exercises $ 149   $ 1   148  
Stock option exercises (in shares)     714      
Standby equity purchase agreement commitment fee 300   $ 1   299  
Standby equity purchase agreement commitment fee ( In Shares)     1,270      
Standby equity purchase agreement advance notices 874   $ 3   871  
Standby equity purchase agreement advance notices (in shares)     3,200      
Stock issued for tender offer 21,355   $ 86   21,269  
Warrant exercises     $ 1   (1)  
Warrant exercises (in shares)     422      
Issuance costs related to stock to be issued for private offerings (3,407)       (3,407)  
Dividends accrued and paid in common stock upon conversion (1,378)       (1,378)  
Dividends accrued and paid in common stock upon conversion (in Shares)     198      
Stock-based compensation 1,630       1,630  
Net Income (Loss) (42,699)         (42,699)
Ending balance at May. 31, 2026 $ (109,718)   $ 1,374   $ 819,393 $ (930,485)
Ending balance (shares) at May. 31, 2026   34 1,373,803      
Ending balance treasury stock (shares) at May. 31, 2026 286     286