Quarterly report pursuant to Section 13 or 15(d)

Consolidated Statement of Changes in Stockholders' (Deficit) Equity

v3.19.3
Consolidated Statement of Changes in Stockholders' (Deficit) Equity - USD ($)
Total
Preferred Stock [Member]
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Beginning balance at May. 31, 2018 $ (13,157,971) $ 92 $ 216,881 $ (159) $ 159,764,611 $ (173,139,396)
Beginning balance, shares at May. 31, 2018   92,100 216,881,790 159,011    
Proceeds from registered direct offering 985,000 $ 0 $ 1,970 $ 0 983,030 0
Proceeds from registered direct offering, shares   0 1,970,000 0    
Offering costs related to registered direct offering, value 0          
Proceeds from private equity offering 7,514,300 $ 0 $ 15,029 $ 0 7,499,271 0
Proceeds from private equity offering, shares   0 15,028,600 0    
Offering costs related to private equity offering (882,716) $ 0 $ 0 $ 0 (882,716)  
Offering costs related to equity offering (75,151)       (75,151)  
Legal fees in connection with equity offerings (50,544) 0 0 0 (50,544)  
Stock-based compensation 283,346 0 0 0 283,346  
Net loss (14,413,569) 0 0 0   (14,413,569)
Ending balance at Aug. 31, 2018 (19,797,305) $ 92 $ 233,880 $ (159) 167,521,847 (187,552,965)
Ending balance, shares at Aug. 31, 2018   92,100 233,880,390 159,011    
Beginning balance at May. 31, 2019 (8,914,060) $ 95 $ 329,555 $ (159) 220,119,856 (229,363,407)
Beginning balance, shares at May. 31, 2019   95,346 329,554,763 159,011    
Issuance of stock payment shares   $ 0 $ 3,015 $ 0    
Issuance of stock payment shares, shares   0 3,014,181 0    
Issuance of stock for note payable redemption 1,005,000       1,001,985 0
Proceeds from registered direct offering 2,255,800 $ 0 $ 5,640 $ 0 2,250,160 0
Proceeds from registered direct offering, shares   0 5,639,500 0    
Offering costs related to registered direct offering, value (260,208) $ 0 $ 0 $ 0 (260,208) 0
Offering costs related to registered direct offering, shares   0 0 0    
Proceeds from public warrant tender offers 11,900,260 $ 0 $ 45,376 $ 0 11,854,884 0
Proceeds from public warrant tender offers (shares)   0 45,375,923 0    
Inducement interest expense - public warrant tender offers 2,430,514 $ 0 $ 0 $ 0 2,430,514 0
Proceeds from Series C Convertible Preferred offering 1,754,000 $ 2 0 0 1,753,998 0
Proceeds from Series C Convertible Preferred offering, shares   1,754        
Offering costs related to Series C Preffered offering (197,460) $ 0 0 0 (197,460) 0
Dividends on Series C Convertible Preferred shares (110,826) 0 0 0 0 (110,826)
Legal fees in connection with equity offerings (15,877) 0 0 0 (15,877) 0
Offering costs related to public warrant tender offers (1,058,466) 0     (1,058,466) 0
Stock-based compensation 580,727 0 0 0 580,727 0
Net loss (16,163,999) 0 0 0 0 (16,163,999)
Ending balance at Aug. 31, 2019 $ (6,794,595) $ 97 $ 383,586 $ (159) $ 238,460,113 $ (245,638,232)
Ending balance, shares at Aug. 31, 2019   97,100 383,584,367 159,011