Annual report pursuant to Section 13 and 15(d)

Consolidated Statement of Changes in Stockholders' (Deficit) Equity

v3.19.2
Consolidated Statement of Changes in Stockholders' (Deficit) Equity - USD ($)
Total
Exercise Price 1
Exercise Price 2
Preferred Stock [Member]
Preferred Stock [Member]
Exercise Price 1
Preferred Stock [Member]
Exercise Price 2
Common Stock [Member]
Common Stock [Member]
Exercise Price 1
Common Stock [Member]
Exercise Price 2
Treasury Stock [Member]
Treasury Stock [Member]
Exercise Price 1
Treasury Stock [Member]
Exercise Price 2
Additional Paid-in Capital [Member]
Additional Paid-in Capital [Member]
Exercise Price 1
Additional Paid-in Capital [Member]
Exercise Price 2
Accumulated Deficit [Member]
Beginning balance at May. 31, 2016 $ 10,205,450     $ 95     $ 123,336     $ 0     $ 107,307,933     $ (97,225,914)
Beginning balance, shares at May. 31, 2016       95,100     123,335,634     0            
Proceeds from registered direct offering 14,044,252           $ 24,539           14,019,713      
Proceeds from registered direct offering, shares             24,538,994                  
Proceeds from private equity offering 729,500     $ 0     $ 730     $ 0     728,770      
Proceeds from private equity offering, shares       0     729,500     0            
Offering costs related to equity offering (1,804,249)     $ 0     $ 0     $ 0     (1,804,249)      
Stock-based compensation 1,204,791     0     0     0     1,204,791      
Legal fees in connection with registered offerings (280,883)     0     0     0     (280,883)      
Debt discount related to convertible notes payable 91,389     0     0     0     91,389      
Conversion of Series B Convertible Preferred       $ (3)     $ 3     $ 0            
Conversion of Series B Convertible Preferred, shares       (3,000)     40,602     0            
Interest expense related to warrant extension 72,434     $ 0     $ 36     $ 0     72,398      
Proceeds from warrant exercise   $ 365,383 $ 32,500   $ 0 $ 0   $ 730 $ 44   $ 0 $ 0   $ 364,653 $ 32,456  
Proceeds from warrant exercise, shares         0 0   730,765 43,332   0 0        
Cashless exercise of warrants       $ 0     $ 50     $ 0     (50)      
Cashless exercise of warrants, shares       0     49,417     0            
Net loss (25,763,801)                             (25,763,801)
Ending balance at May. 31, 2017 (1,103,234)     $ 92     $ 149,468     $ 0     121,736,921     (122,989,715)
Ending balance, shares at May. 31, 2017       92,100     149,468,244     0            
Proceeds from registered direct offering 13,611,419     $ 0     $ 25,494     $ 0     13,585,925      
Proceeds from registered direct offering, shares       0     25,493,853     0            
Offering costs related to registered direct offering, value (85,381)     $ 0     $ 0     $ 0     (857,149)      
Offering costs related to registered direct offering, shares       0     0     0            
Proceeds from private equity offering 17,643,451     $ 0     $ 35,286     $ 0     17,608,165      
Proceeds from private equity offering, shares       0     35,286,904     0            
Offering costs related to private equity offering (1,717,597)     $ 0     $ 0     $ 0     (1,717,597)      
Legal fees in connection with equity offerings (533,436)     0     0     0     (533,436)      
Offering costs related to warrant tender offer (85,381)     0     0     0     (85,381)      
Stock-based compensation 1,290,777     0     0     0     1,290,777      
Stock issued for board compensation 260,190     0     0     0     260,190      
Stock issued for bonuses and tendered for income tax, value 104,546     $ 0     $ 311     $ (159)     104,394      
Stock issued for bonuses and tendered for income tax, shares       0     310,526     159,011            
Debt discount related to convertible notes payable 1,645,011     $ 0     $ 0     $ 0     1,645,011      
Interest expense related to warrant extension 826,252     0     0     0     826,252      
Interest expense related to warrant tender offer 393,685     0     0     0     393,685      
Interest expense related to conversion of notes payable 2,352,045     0     0     0     2,352,045      
Proceeds from warrant exercise 3,161,131     $ 0     $ 6,322     $ 0     3,154,809      
Proceeds from warrant exercise, shares       0     6,322,263     0            
Net loss (50,149,681)                             (50,149,681)
Ending balance at May. 31, 2018 (13,157,971)     $ 92     $ 216,881     $ (159)     159,764,611     (173,139,396)
Ending balance, shares at May. 31, 2018       92,100     216,881,790     159,011            
Acquisition 11,558,000     $ 0     $ 18,658     $ 0     11,539,342      
Acquisition, share       0     18,658,000     0            
Issuance of stock payment shares 0           $ 8,342           (8,342)      
Issuance of stock payment shares, shares             8,342,000                  
Issuance of stock for note payable redemption 1,455,000           $ 3,757           1,451,243      
Issuance of stock for note payable redemption ,shares             3,756,406                  
Proceeds from registered direct offering 11,814,739           $ 23,629           11,791,110      
Proceeds from registered direct offering, shares             23,629,480                  
Offering costs related to registered direct offering, value (1,129,516)     $ 0     $ 0     $ 0     (1,129,516)      
Offering costs related to registered direct offering, shares       0     0     0            
Proceeds from private equity offering 23,487,584           $ 46,976           23,440,608      
Proceeds from private equity offering, shares             46,975,170                  
Offering costs related to private equity offering (2,697,149)     $ 0     $ 0     $ 0     (2,697,149)      
Offering costs related to debt offering 260,636     0     0     0     260,636      
Debt discount and issuance costs related to offering 3,059,159     0     0     0     3,059,159      
Beneficial conversion feature on note payable and relative fair value associated with warrants 3,534,992     0     0     0     3,534,992      
Proceeds from private warrant exchange 2,966,512     $ 0     $ 11,312     $ 0     2,955,200      
Proceeds from private warrant exchange, shares       0     11,311,917     0            
Offering costs related to private warrant exchange (266,986)     $ 0     $ 0     $ 0     (266,986)      
Inducement interest expense on private warrant exchange 195,927     0     0     0     195,927      
Proceeds from Series C Convertible Preferred offering 3,083,700     $ 3     $ 0     $ 0     3,083,697      
Proceeds from Series C Convertible Preferred offering, shares       3,246     0     0            
Dividends on Series C Convertible Preferred shares (37,351)     $ 0     $ 0     $ 0           (37,351)
Legal fees in connection with equity offerings (242,771)     0     0     0     (242,771)      
Stock-based compensation $ 3,388,095     0     0     0     3,388,095      
Conversion of Series B Convertible Preferred, shares 3,756,406                              
Net loss $ (56,186,660)                             (56,186,660)
Ending balance at May. 31, 2019 $ (8,914,060)     $ 95     $ 329,555     $ (159)     $ 220,119,856     $ (229,363,407)
Ending balance, shares at May. 31, 2019       95,346     329,554,763     159,011