Quarterly report pursuant to Section 13 or 15(d)

Consolidated Statement of Changes in Stockholders' (Deficit) Equity

v3.21.1
Consolidated Statement of Changes in Stockholders' (Deficit) Equity - USD ($)
shares in Thousands, $ in Thousands
Preferred Stock [Member]
Series C Convertible Preferred Stock
Preferred Stock [Member]
Series D Convertible Preferred Stock
Preferred Stock [Member]
Common Stock
Registered Direct Offering [Member]
Common Stock
Public Warrant Tender Offering [Member]
Common Stock
Private Warrant Exchange [Member]
Common Stock
Private Placement [Member]
Common Stock
Treasury Stock
Additional Paid-in Capital [Member]
Series C Convertible Preferred Stock
Additional Paid-in Capital [Member]
Series D Convertible Preferred Stock
Additional Paid-in Capital [Member]
Registered Direct Offering [Member]
Additional Paid-in Capital [Member]
Public Warrant Tender Offering [Member]
Additional Paid-in Capital [Member]
Private Warrant Exchange [Member]
Additional Paid-in Capital [Member]
Private Placement [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit
Series B Convertible Preferred Stock
Accumulated Deficit
Series C Convertible Preferred Stock
Accumulated Deficit
Series D Convertible Preferred Stock
Accumulated Deficit
Series B Convertible Preferred Stock
Series C Convertible Preferred Stock
Series D Convertible Preferred Stock
Registered Direct Offering [Member]
Public Warrant Tender Offering [Member]
Private Warrant Exchange [Member]
Private Placement [Member]
Total
Beginning balance at May. 31, 2019     $ 0         $ 330 $ 0             $ 220,120       $ (229,364)               $ (8,914)
Beginning balance, shares at May. 31, 2019     95         329,554 159                                      
Issuance of stock for convertible note repayment, value               $ 3               1,002                       1,005
Issuance of stock for convertible note, shares               3,014                                        
Stock issued via offering, tender or placement, value $ 2     $ 6 $ 45         $ 1,754   $ 2,250 $ 11,855                 $ 1,754   $ 2,256 $ 11,900      
Stock issued via offering, tender or placement, shares       5,640 45,376                                              
Offering costs                   (198)   (260) $ (1,058)                 (198)   (260) $ (1,058)      
Inducement interest expense                               2,430                       2,430
Stock-based compensation                               581                       581
Legal fees in connection with equity offerings                               (16)                       (16)
Dividends paid                                   $ (110)       (110)            
Net loss                                       (16,164)               (16,164)
Ending balance at Aug. 31, 2019     $ 0         $ 384 $ 0             238,460       (245,638)               (6,794)
Ending balance, shares at Aug. 31, 2019     97         383,584 159                                      
Beginning balance at May. 31, 2019     $ 0         $ 330 $ 0             220,120       (229,364)               (8,914)
Beginning balance, shares at May. 31, 2019     95         329,554 159                                      
Stock issued for services, value                                                       3
Stock issued for incentive compensation and tendered for income tax                                                       155
Relative fair market value associated with warrants exercised                                                       2,404
Net loss                                                       (66,792)
Ending balance at Feb. 29, 2020     $ 0         $ 471 $ 0             291,829       (296,683)               (4,383)
Ending balance, shares at Feb. 29, 2020     108         471,092 286                                      
Beginning balance at May. 31, 2019     $ 0         $ 330 $ 0             220,120       (229,364)               (8,914)
Beginning balance, shares at May. 31, 2019     95         329,554 159                                      
Ending balance at May. 31, 2020     $ 0         $ 519 $ 0             351,711       (354,711)               (2,481)
Ending balance, shares at May. 31, 2020     109         519,261 286                                      
Beginning balance at Aug. 31, 2019     $ 0         $ 384 $ 0             238,460       (245,638)               (6,794)
Beginning balance, shares at Aug. 31, 2019     97         383,584 159                                      
Issuance of stock for convertible note repayment, value               $ 2               738                       740
Issuance of stock for convertible note, shares               2,270                                        
Stock issued via offering, tender or placement, value       $ 13           2,788   4,396                   2,788   4,409        
Stock issued via offering, tender or placement, shares 3     13,461                                                
Offering costs                   (182)   (74)                   (182)   (74)        
Inducement interest expense                               283                       283
Stock-based compensation                               434                       434
Note conversion and extension fees                               (217)                       (217)
Exercise of option to repurchase common stock                               (8)                       (8)
Dividends paid                                   (151)       (151)            
Net loss                                       (14,860)               (14,860)
Ending balance at Nov. 30, 2019     $ 0         $ 399 $ 0             246,618       (260,649)               (13,632)
Ending balance, shares at Nov. 30, 2019     100         399,315 159                                      
Issuance of stock for convertible note repayment, value               $ 18               9,059                       9,077
Issuance of stock for convertible note, shares               17,683                                        
Stock issued via offering, tender or placement, value       $ 20   $ 20       415 $ 7,570 5,981   $ 5,965               415 $ 7,570 6,001   $ 5,985    
Stock issued via offering, tender or placement, shares   8   19,756   20,441                                            
Stock issued for services, value               $ 3               (3)                        
Stock issued for services, shares               2,620                                        
Stock issued for incentive compensation and tendered for income tax                               154                       154
Stock issued for incentive compensation and tendered for income tax , shares               380 127                                      
Exercise of stock options, value                               54                       54
Exercise of stock options, shares               181                                        
Exercise of warrants               $ 11               5,417                       5,428
Exercise of warrants, shares               10,716                                        
Offering costs                   $ (53) $ (5) $ (44)   (197)               (53) (5) $ (44)   (197)    
Inducement interest expense                           5,163                       5,163    
Stock-based compensation                               3,331                       3,331
Relative fair market value associated with warrants exercised                               2,404                       2,404
Dividends paid                                   $ (204) $ (62)     $ (204) $ (62)          
Net loss                                       (35,768)               (35,768)
Ending balance at Feb. 29, 2020     $ 0         $ 471 $ 0             291,829       (296,683)               (4,383)
Ending balance, shares at Feb. 29, 2020     108         471,092 286                                      
Beginning balance at May. 31, 2020     $ 0         $ 519 $ 0             351,711       (354,711)               (2,481)
Beginning balance, shares at May. 31, 2020     109         519,261 286                                      
Issuance of stock for convertible note repayment, value               $ 2               9,535                       9,537
Issuance of stock for convertible note, shares               2,119                                        
Stock issued via offering, tender or placement, value           $ 17               7,787                       7,804    
Stock issued via offering, tender or placement, shares           16,544                                            
Stock issued in legal settlement, value               $ 4               (4)                        
Stock issued in legal settlement, shares               4,000                                        
Stock issued for incentive compensation and tendered for income tax                               828                       828
Stock issued for incentive compensation and tendered for income tax , shares               323 156                                      
Exercise of stock options, value                               39                       39
Exercise of stock options, shares               100                                        
Exercise of warrants               $ 28               13,441                       13,469
Exercise of warrants, shares               27,928                                        
Conversion of Series B preferred stock to common stock, shares     (5)         50                                        
Offering costs                           (364)                       $ (364)    
Inducement interest expense                               3,345                       3,345
Stock-based compensation                               2,086                       2,086
Dividends paid                                 $ (243)       $ (243)              
Dividends accrued                                       (420)               (420)
Net loss                                       (30,832)               (30,832)
Ending balance at Aug. 31, 2020     $ 0         $ 570 $ 0             388,404       (386,206)               2,768
Ending balance, shares at Aug. 31, 2020     104         570,325 442                                      
Beginning balance at May. 31, 2020     $ 0         $ 519 $ 0             351,711       (354,711)               (2,481)
Beginning balance, shares at May. 31, 2020     109         519,261 286                                      
Stock issued via offering, tender or placement, shares                                                   29,000    
Ending balance at Nov. 30, 2020     $ 0         $ 590 $ 0             414,463       (421,587)               (6,534)
Ending balance, shares at Nov. 30, 2020     104         590,279 442                                      
Beginning balance at May. 31, 2020     $ 0         $ 519 $ 0             351,711       (354,711)               (2,481)
Beginning balance, shares at May. 31, 2020     109         519,261 286                                      
Net loss                                                       (109,783)
Ending balance at Feb. 28, 2021     $ 0         $ 609 $ 0             449,579       (465,983)               (15,795)
Ending balance, shares at Feb. 28, 2021     96         609,420 442                                      
Beginning balance at Aug. 31, 2020     $ 0         $ 570 $ 0             388,404       (386,206)               2,768
Beginning balance, shares at Aug. 31, 2020     104         570,325 442                                      
Issuance of stock for convertible note repayment, value               $ 4               11,549                       11,553
Issuance of stock for convertible note, shares               4,293                                        
Stock issued via offering, tender or placement, value           $ 13 $ 1             4,583 $ 999                     $ 4,596 $ 1,000  
Stock issued via offering, tender or placement, shares           12,480 667                                          
Exercise of stock options, value                               10                       10
Exercise of stock options, shares               10                                        
Exercise of warrants               $ 2               1,737                       1,739
Exercise of warrants, shares               2,504                                        
Inducement interest expense                               3,758                       3,758
Stock-based compensation                               3,423                       3,423
Dividends accrued                                       (415)               (415)
Net loss                                       (34,966)               (34,966)
Ending balance at Nov. 30, 2020     $ 0         $ 590 $ 0             414,463       (421,587)               (6,534)
Ending balance, shares at Nov. 30, 2020     104         590,279 442                                      
Issuance of stock for convertible note repayment, value               $ 4               20,500                       20,504
Issuance of stock for convertible note, shares               4,013                                        
Stock issued via offering, tender or placement, value           $ 6               3,461                       $ 3,467    
Stock issued via offering, tender or placement, shares           5,939                                       5,900    
Exercise of stock options, value               $ 2               1,778                       1,780
Exercise of stock options, shares               2,471                                        
Exercise of warrants               $ 7               3,432                       3,439
Exercise of warrants, shares               6,638                                        
Conversion of Series B preferred stock to common stock, shares     (8)         80                                        
Offering costs                           $ (131)                       $ (131)    
Inducement interest expense                               4,139                       4,139
Stock-based compensation                               1,937                       1,937
Dividends accrued                                       (411)               (411)
Net loss                                       (43,985)               (43,985)
Ending balance at Feb. 28, 2021     $ 0         $ 609 $ 0             $ 449,579       $ (465,983)               $ (15,795)
Ending balance, shares at Feb. 28, 2021     96         609,420 442