Annual report pursuant to Section 13 and 15(d)

Consolidated Statement of Changes in Stockholders' (Deficit) Equity

v3.20.2
Consolidated Statement of Changes in Stockholders' (Deficit) Equity - USD ($)
Total
Exercise Price 1
Preferred Stock [Member]
Preferred Stock [Member]
Exercise Price 1
Common Stock [Member]
Common Stock [Member]
Exercise Price 1
Treasury Stock [Member]
Treasury Stock [Member]
Exercise Price 1
Additional Paid-in Capital [Member]
Additional Paid-in Capital [Member]
Exercise Price 1
Accumulated Deficit [Member]
Beginning balance at May. 31, 2017 $ (1,103,234)   $ 92   $ 149,468   $ 0   $ 121,736,921   $ (122,989,715)
Beginning 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 (857,149)   $ 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     $ 0   $ 0   $ 0        
Offering costs related to equity offering (1,717,597)               (1,717,597)    
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        
Legal fees in connection with registered offerings (533,436)               (533,436)    
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   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 $ 0 $ 0 $ 6,322 $ 0 $ 0   $ 3,154,809  
Proceeds from warrant exercise, shares     0 0 0 6,322,263 0 0      
Offering costs related to public warrant tender offers (85,381)   $ 0   $ 0   $ 0   (85,381)    
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   $ 0   $ 8,342   $ 0   (8,342)    
Issuance of stock payment shares, shares     0   8,342,000   0        
Issuance of stock for note payable redemptions and conversions 1,455,000   $ 0   $ 3,757   $ 0   1,451,243    
Issuance of stock for note payable redemptions and conversions , shares     0   3,756,406   0        
Proceeds from registered direct offering 11,814,739   $ 0   $ 23,629   $ 0   11,791,110    
Proceeds from registered direct offering, shares     0   23,629,480   0        
Offering costs related to registered direct offering, value (1,129,516)   $ 0       $ 0   (1,129,516)    
Offering costs related to registered direct offering, shares     0       0        
Proceeds from private equity offering 23,487,584   $ 0   $ 46,976   $ 0   23,440,608    
Proceeds from private equity offering, shares     0   46,975,170   0        
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    
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        
Issuance of stock for note payable redemptions and conversions 10,822,188   $ 0   $ 22,967   $ 0   $ 10,799,221    
Issuance of stock for note payable redemptions and conversions , shares     0   22,967,227       0    
Proceeds from registered direct offering 12,665,799   $ 0   $ 38,857   $ 0   $ 12,626,942    
Proceeds from registered direct offering, shares     0   38,856,094   0        
Offering costs related to registered direct offering, value (377,859)   $ 0       $ 0   (377,859)    
Offering costs related to registered direct offering, shares     0       0        
Proceeds from private warrant exchange 6,021,093   $ 0   $ 20,527   $ 0   6,000,566    
Proceeds from private warrant exchange, shares     0   20,528,745   0        
Offering costs related to private warrant exchange (197,253)   $ 0   $ 0   $ 0   (197,253)    
Inducement interest expense on private warrant exchange 5,191,338   0   0   0   $ 5,191,338    
Proceeds from Series C Convertible Preferred offering     $ 5   $ 0   0        
Proceeds from Series C Convertible Preferred offering, shares     4,957   0       0    
Legal fees in connection with equity offerings (15,877)   $ 0   $ 0   0   $ (15,877)    
Offering costs related to warrant tender offer (1,058,466)               (1,058,466)    
Stock-based compensation 6,547,803   $ 0   0   0   6,547,803    
Stock issued for bonuses and tendered for income tax, value $ 154,552       $ 380   $ (127)   $ 154,299    
Stock issued for bonuses and tendered for income tax, shares         379,880   126,997        
Proceeds from warrant exercise   $ 20,500,115   $ 0   $ 42,024   $ 0   $ 20,458,091  
Proceeds from warrant exercise, shares       0   42,023,872   0      
Note conversion and extension fees 3,899,205   0   8,232   0   3,890,973    
Note conversion and extension fees, Shares         8,232,006            
Relative fair market value associated with warrants exercised $ 11,948,972   $ 0   $ 0   $ 0   $ 11,948,972    
Proceeds from public warrant tender offers 11,900,260       $ 45,376       11,854,884    
Proceeds from public warrant tender offers (shares)         45,375,923            
Offering costs related to public warrant tender offers (1,058,466)               (1,058,466)    
Proceeds from Series C Preferred offering 4,957,000               4,956,995    
Offering costs related to Series C Preferred offering (432,368)   0   $ 0   0   (432,368)    
Dividends on Series C Preferred shares (671,971)   0   0   0   0   (671,971)
Proceeds from Series D Preferred offering 8,452,000   $ 8   $ 0   0   $ 8,451,992    
Proceeds from Series D Preferred offering , shares     8,452   0       0    
Offering costs related to Series D Preferred offering (4,645)   $ 0   $ 0   0   $ (4,645)    
Dividends on Series D Preferred shares (272,115)   0   0   0       (272,115)
Exercise of option to repurchase common stock (8,342)   0   0   0   (8,342)    
Exercise of stock options 5,602,541       $ 8,724       5,593,817    
Exercise of stock options, shares         8,723,070            
Stock issued for services         $ 2,620       (2,620)    
Stock issued for services, shares         2,620,000            
Inducement interest expense - tender offers and debt conversions 2,713,014               2,713,014    
Legal settlement (22,500,000)               22,500,000    
Net loss (124,403,402)                   (124,403,402)
Ending balance at May. 31, 2020 $ (2,480,478)   $ 108   $ 519,262   $ (286)   $ 351,711,333   $ (354,710,895)
Ending balance, shares at May. 31, 2020     108,755   519,261,580   286,008