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Condensed Consolidated Statements of Changes in Temporary Equity and Stockholders’ Equity (Unaudited) - USD ($)
$ in Thousands
Total
Series E Preferred Stock
Series F Preferred Stock
Stockholders’ Equity
Common Stock
Treasury Stock
Additional Paid in Capital
Accumulated Deficit
Noncontrolling Interest
Beginning balance, common stock (in shares) at May. 31, 2023         100,927,358        
Beginning balance at May. 31, 2023 $ 69,679     $ 59,517 $ 101 $ (62) $ 160,194 $ (100,716) $ 10,162
Beginning balance, treasury stock (in shares) at May. 31, 2023           (5,001,728)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Shares issued (in shares)         7,908,528        
Shares issued 64,716     64,716 $ 8   64,708    
Issuance of common stock from stock plans (in shares)         530,732        
Issuance of warrants to CIM, at fair value 0                
Stock-based compensation 5,641     5,641     5,641    
Stock issuance costs (234)     (234)     (234)    
Net loss (11,854)     (11,457)       (11,457) (397)
Extinguishment of noncontrolling interest (in shares)         1,484,267        
Extinguishment of noncontrolling interest 0     9,765 $ 1   9,764   (9,765)
Ending balance, common stock (in shares) at Aug. 31, 2023         110,850,885        
Ending balance at Aug. 31, 2023 $ 127,948     $ 127,948 $ 110 $ (62) 240,073 (112,173) $ 0
Ending balance, treasury stock (in shares) at Aug. 31, 2023           (5,001,728)      
Temporary equity outstanding (in shares) at May. 31, 2024   0 0            
Temporary equity , beginning balance at May. 31, 2024   $ 0 $ 0            
Increase (Decrease) in Temporary Equity [Roll Forward]                  
Issuance of Preferred Stock (in shares)   301,673 53,191            
Issuance of Preferred Stock   $ 6,932 $ 48,350            
Temporary equity , ending balance at Aug. 31, 2024   $ 6,932 $ 48,350            
Temporary equity outstanding (in shares) at Aug. 31, 2024   301,673 53,191            
Beginning balance, common stock (in shares) at May. 31, 2024 139,051,142       144,083,944        
Beginning balance at May. 31, 2024 $ 124,830       $ 144 $ (62) 374,738 (249,990)  
Beginning balance, treasury stock (in shares) at May. 31, 2024 (5,032,802)         (5,032,802)      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Shares issued (in shares)         6,124,218        
Shares issued $ 31,071       $ 6   31,065    
Issuance of common stock from stock plans (in shares)         769,908        
Issuance of common stock from stock plans 0       $ 1   (1)    
Conversions of debt (in shares)         11,392,978        
Conversions of debt 56,201       $ 11   56,190    
Issuance of shares (in shares)         100,000        
Issuance of Yorkville amendment shares 519           519    
Issuance of warrants to CIM, at fair value 36,479           36,479    
Preferred Series E Dividends (44)             (44)  
Stock-based compensation (2,919)           (2,919)    
Stock issuance costs (44)           (44)    
Net loss $ (4,247)             (4,247)  
Ending balance, common stock (in shares) at Aug. 31, 2024 157,438,246       162,471,048        
Ending balance at Aug. 31, 2024 $ 241,846       $ 162 $ (62) $ 496,027 $ (254,281)  
Ending balance, treasury stock (in shares) at Aug. 31, 2024 (5,032,802)         (5,032,802)