Annual report pursuant to Section 13 and 15(d)

Consolidated Statements of Changes in Stockholders' (Deficit) Equity

v3.10.0.1
Consolidated Statements of Changes in Stockholders' (Deficit) Equity - USD ($)
Total
Private Equity Offering One
Private Equity Offering Two
Conversion Features One
Conversion Features Two
Conversion Features Three
Conversion Features Four
Exercise Price 1
Exercise Price 2
Preferred Stock
Preferred Stock
Series B Convertible Preferred Stock
Common Stock
Common Stock
Series B Convertible Preferred Stock
Common Stock
Private Equity Offering One
Common Stock
Private Equity Offering Two
Common Stock
Conversion Features Two
Common Stock
Conversion Features Three
Common Stock
Conversion Features Four
Common Stock
Exercise Price 1
Common Stock
Exercise Price 2
Treasury Stock
Additional Paid-in Capital
Additional Paid-in Capital
Private Equity Offering One
Additional Paid-in Capital
Private Equity Offering Two
Additional Paid-in Capital
Conversion Features One
Additional Paid-in Capital
Conversion Features Two
Additional Paid-in Capital
Conversion Features Three
Additional Paid-in Capital
Conversion Features Four
Additional Paid-in Capital
Exercise Price 1
Additional Paid-in Capital
Exercise Price 2
Accumulated Deficit
Beginning balance at May. 31, 2015 $ (10,692,516)                 $ 95   $ 63,644                   $ 60,766,047                 $ (71,522,302)
Beginning balance, shares at May. 31, 2015                   95,100   63,644,348                                      
Debt discount due to reduction in note conversion price from ($0.75 to $0.675/share) 329,524                                         329,524                  
Conversion of convertible debt and extinguishment of derivative liability, Value           $ 4,732,514                     $ 5,275                   $ 4,727,239        
Conversion of convertible debt and extinguishment of derivative liability, shares                                 $ 5,274,656                            
Cashless exercise of warrants, shares                       74,490                                      
Cashless exercise of warrants, value                       $ 74                   (74)                  
Stock-based compensation 2,353,194                                         2,353,194                  
Deferred offering costs (3,915,127)                                         (3,915,127)                  
Proceeds from private equity offering, value   $ 33,268,464 $ 4,301,500                     $ 44,358 $ 4,302               $ 33,224,106 $ 4,297,198              
Proceeds from private equity offering, shares                           44,357,838 4,301,500                                
Proceeds from warrant exercise               $ 96,154 $ 452,465                   $ 192 $ 604                 $ 95,962 $ 451,861  
Proceeds from warrant exercise, shares                                     192,307 603,286                      
Interest expense related to warrant extension       $ 757,871                                         $ 757,871            
Modification of warrants to related conversion inducement       $ 866,713                                         $ 866,713            
Common shares issued to extinguish promissory notes payable, convertible debt and related interest, shares                               4,095,008   792,201                          
Common shares issued to extinguish promissory notes payable, convertible debt and related interest, value         $ 2,764,154   $ 594,152                 $ 4,095   $ 792               $ 2,760,059   $ 593,360      
Net (loss) at year ended (25,703,612)                                                           (25,703,612)
Ending balance at May. 31, 2016 10,205,450                 $ 95   $ 123,336                   107,307,933                 (97,225,914)
Ending balance, shares at May. 31, 2016                   95,100   123,335,634                                      
Cashless exercise of warrants, shares                       49,417                                      
Cashless exercise of warrants, value                       $ 50                   (50)                  
Stock-based compensation 1,204,791                                         1,204,791                  
Proceeds from private equity offering, value     $ 729,500                       $ 730                 $ 728,770              
Proceeds from private equity offering, shares                             729,500                                
Offering costs related to equity offering (1,804,249)                                         (1,804,249)                  
Proceeds from registered direct offering 14,044,252                     $ 24,539                   14,019,713                  
Proceeds from registered direct offering, shares                       24,538,994                                      
Proceeds from warrant exercise               $ 365,383 $ 32,500                   $ 730 $ 44                 $ 364,653 $ 32,456  
Proceeds from warrant exercise, shares                                     730,765 43,332                      
Debt discount related to convertible notes payable 91,389                                         91,389                  
Interest expense related to warrant extension 72,434                     $ 36                   72,398                  
Legal fees in connection with registered offerings (280,883)                                         (280,883)                  
Common shares issued to extinguish promissory notes payable, convertible debt and related interest, shares                     (3,000)   40,602                                    
Common shares issued to extinguish promissory notes payable, convertible debt and related interest, value                     $ (3)   $ 3                                    
Net (loss) at year ended (25,763,801)                                                           (25,763,801)
Ending balance at May. 31, 2017 (1,103,234)                 $ 92   $ 149,468                   121,736,921                 (122,989,715)
Ending balance, shares at May. 31, 2017                   92,100   149,468,244                                      
Stock-based compensation 1,290,777                                         1,290,777                  
Stock issued for board compensation 260,190                                         260,190                  
Stock issued for bonuses and tendered for income tax, value 104,546                     $ 311                 $ (159) 104,394                  
Stock issued for bonuses and tendered for income tax, shares                       310,526                 159,011                    
Proceeds from private equity offering, value 17,643,451                     $ 35,286                   17,608,165                  
Proceeds from private equity offering, shares                       35,286,904                                      
Offering costs related to private equity offering, value (1,717,597)                                         (1,717,597)                  
Proceeds from registered direct offering 13,611,419                     $ 25,494                   13,585,925                  
Proceeds from registered direct offering, shares                       25,493,853                                      
Offering costs related to registered direct offering (857,149)                                         (857,149)                  
Offering costs related to registered direct offering, value                   $ 0   $ 0                                      
Offering costs related to registered direct offering, shares                   0   0                                      
Legal fees in connection with equity offerings (533,436)                                         (533,436)                  
Proceeds from warrant exercise 3,161,132                     $ 6,322                   3,154,810                  
Proceeds from warrant exercise, shares                       6,322,263                                      
Offering costs related to warrant tender offer (85,382)                                         (85,382)                  
Debt discount related to convertible notes payable 1,645,011                                         1,645,011                  
Interest expense related to warrant extension 826,252                                         826,252                  
Interest expense related to warrant tender offer 393,685                                         393,685                  
Interest expense related to conversion of notes payable 2,352,045                                         2,352,045                  
Net (loss) at year ended (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