Annual report pursuant to Section 13 and 15(d)

Private Placements of Common Stock and Warrants - Warrants Activity (Details)

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Private Placements of Common Stock and Warrants - Warrants Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
May 31, 2024
May 31, 2023
May 31, 2022
Private Placements of Common Stock and Warrants      
Warrants outstanding beginning of period 259,910 73,248  
Granted 115,582 201,771  
Exercised (3,000) (6,207)  
Forfeited, expired, and cancelled (11,047) (8,902)  
Warrants outstanding at end of period 361,445 259,910 73,248
Warrants outstanding and exercisable 361,445    
Outstanding at the beginning of the year (in dollars per share) $ 0.37 $ 0.59  
Granted 0.28 0.33  
Exercised 0.10 0.63  
Forfeited, expired, and cancelled 0.63 0.75  
Outstanding at the end of the year (in dollars per share) 0.34 $ 0.37 $ 0.59
Warrants outstanding and exercisable $ 0.34    
Weighted average remaining contractual life in years 4 years 2 months 15 days 4 years 6 months 25 days 3 years 2 months 4 days
Weighted average remaining contractual life in years exercisable 4 years 2 months 15 days    
Aggregate intrinsic value outstanding of beginning $ 7,276 $ 352  
Aggregate intrinsic value exercised 480 758  
Aggregate intrinsic value outstanding of end period 2,697 $ 7,276 $ 352
Aggregate intrinsic value exercisable $ 2,697