Quarterly report pursuant to Section 13 or 15(d)

Consolidated Statement of Changes in Stockholders' (Deficit) Equity

v3.20.4
Consolidated Statement of Changes in Stockholders' (Deficit) Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Private Placement [Member]
Fiscal Year To Date
Fiscal Year To Date
Private Placement [Member]
Preferred Stock [Member]
Common Stock [Member]
Common Stock [Member]
Private Placement [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Additional Paid-in Capital [Member]
Private Placement [Member]
Accumulated Deficit [Member]
Beginning balance at May. 31, 2019 $ (8,914)   $ (8,914)     $ 330     $ 220,120   $ (229,364)
Beginning balance, shares at May. 31, 2019         95 329,554   159      
Issuance of stock for convertible note repayment 1,005   1,005     $ 3     1,002    
Issuance of stock for convertible note repayment, shares           3,014          
Dividends on Series C preferred shares (110)                   (110)
Stock-based compensation 581   581           581    
Net loss (16,164)   (16,164)               (16,164)
Proceeds from registered direct offering 2,256   2,256     $ 6     2,250    
Proceeds from registered direct offering, shares           5,640          
Offering costs related to registered direct offering, value (260)   (260)           (260)    
Inducement interest expense—public warrant tender offers 2,430   2,430           2,430    
Dividends on Series C preferred stock     (110)                
Legal fees in connection with equity offerings (16)   (16)           (16)    
Proceeds from public warrant tender offers 11,900   11,900     $ 45     11,855    
Proceeds from public warrant tender offers (shares)           45,376          
Offering costs related to public warrant tender offers (1,058)   (1,058)           (1,058)    
Proceeds from Series C preferred stock offering 1,754   1,754   $ 2       1,754    
Offering costs related to Series C preferred stock offering (198)   (198)           (198)    
Ending balance at Aug. 31, 2019 (6,794)   (6,794)     $ 384     238,460   (245,638)
Ending balance, shares at Aug. 31, 2019         97 383,584   159      
Beginning balance at May. 31, 2019 (8,914)   (8,914)     $ 330     220,120   (229,364)
Beginning balance, shares at May. 31, 2019         95 329,554   159      
Net loss (31,024)                    
Ending balance at Nov. 30, 2019 (13,632)   (13,632)     $ 399     246,618   (260,649)
Ending balance, shares at Nov. 30, 2019         100 399,315   159      
Beginning balance at May. 31, 2019 (8,914)   (8,914)     $ 330     220,120   (229,364)
Beginning balance, shares at May. 31, 2019         95 329,554   159      
Ending balance at May. 31, 2020 (2,481)   (2,481)     $ 519     351,711   (354,711)
Ending balance, shares at May. 31, 2020         109 519,261   286      
Beginning balance at Aug. 31, 2019 (6,794)   (6,794)     $ 384     238,460   (245,638)
Beginning balance, shares at Aug. 31, 2019         97 383,584   159      
Issuance of stock for convertible note repayment 740   1,745     $ 2     738    
Issuance of stock for convertible note repayment, shares           2,270          
Note conversion and extension fees (217)   (217)           (217)    
Inducement interest expense related to private warrant exchange     2,713                
Dividends on Series C preferred shares (151)   (261)               (151)
Stock-based compensation 434   1,015           434    
Net loss (14,860)   (31,024)               (14,860)
Proceeds from registered direct offering 4,409   6,665     $ 13     4,396    
Proceeds from registered direct offering, shares           13,461          
Offering costs related to registered direct offering, value (74)   (334)           (74)    
Inducement interest expense—public warrant tender offers 283               283    
Proceeds from Series C Convertible Preferred offering     4,542                
Legal fees in connection with equity offerings     (16)                
Proceeds from public warrant tender offers     11,900     $ 0          
Proceeds from public warrant tender offers (shares)           0          
Offering costs related to public warrant tender offers     (1,058)                
Proceeds from Series C preferred stock offering 2,788       $ 3       2,788    
Offering costs related to Series C preferred stock offering (182)   (380)           (182)    
Exercise of option to repurchase common stock (8)   (8)           (8)    
Ending balance at Nov. 30, 2019 (13,632)   (13,632)     $ 399     246,618   (260,649)
Ending balance, shares at Nov. 30, 2019         100 399,315   159      
Beginning balance at May. 31, 2020 (2,481)   (2,481)     $ 519     351,711   (354,711)
Beginning balance, shares at May. 31, 2020         109 519,261   286      
Issuance of stock for convertible note repayment 9,537   9,537     $ 2     9,535    
Issuance of stock for convertible note repayment, shares           2,119          
Issuance of legal settlement shares           $ 4     (4)    
Issuance of legal settlement shares , shares           4,000          
Exercise of stock options 39   39           39    
Exercise of stock options, shares           100          
Stock issued for incentive compensation and tendered for income tax 828   828           828    
Stock issued for incentive compensation and tendered for income tax , shares           323   156      
Conversion of Series B preferred stock to common stock, shares         (5) 50          
Private warrant exchange 7,804   7,804     $ 17     7,787    
Private warrant exchange , shares           16,544          
Exercise of warrants 13,469   13,469     $ 28     13,441    
Exercise of warrants , shares           27,928          
Inducement interest expense related to private warrant exchange 3,345   3,345           3,345    
Offering costs related to private warrant exchange (364)   (364)           (364)    
Dividend declared and paid on Series B preferred stock (243)   (243)               (243)
Dividends accrued on preferred stock (420)   (420)               (420)
Stock-based compensation 2,086   2,086           2,086    
Net loss (30,832)   (30,832)               (30,832)
Ending balance at Aug. 31, 2020 2,768   2,768     $ 570     388,404   (386,206)
Ending balance, shares at Aug. 31, 2020         104 570,325   442      
Beginning balance at May. 31, 2020 (2,481)   (2,481)     $ 519     351,711   (354,711)
Beginning balance, shares at May. 31, 2020         109 519,261   286      
Dividend declared and paid on Series B preferred stock     (243)                
Net loss (65,798)                    
Ending balance at Nov. 30, 2020 (6,534)   (6,534)     $ 590     414,463   (421,587)
Ending balance, shares at Nov. 30, 2020         104 590,279   442      
Beginning balance at Aug. 31, 2020 2,768   2,768     $ 570     388,404   (386,206)
Beginning balance, shares at Aug. 31, 2020         104 570,325   442      
Issuance of stock for convertible note repayment 11,553   21,090     $ 4     11,549    
Issuance of stock for convertible note repayment, shares           4,293          
Exercise of stock options 10   49           10    
Exercise of stock options, shares           10          
Stock issued for incentive compensation and tendered for income tax     828                
Stock issued for private offering   $ 1,000   $ 1,000     $ 1     $ 999  
Stock issued for private offering , Shares             667        
Private warrant exchange 4,596   12,400     $ 13     4,583    
Private warrant exchange , shares           12,480          
Exercise of warrants 1,739   15,208     $ 2     1,737    
Exercise of warrants , shares           2,504          
Inducement interest expense related to private warrant exchange     7,103                
Offering costs related to private warrant exchange     (364)                
Dividends accrued on preferred stock (415)   (835)               (415)
Stock-based compensation 3,423   5,509           3,423    
Net loss (34,966)   (65,798)               (34,966)
Offering costs related to registered direct offering, value 0               0    
Inducement interest expense—public warrant tender offers 3,758               3,758    
Ending balance at Nov. 30, 2020 $ (6,534)   $ (6,534)     $ 590     $ 414,463   $ (421,587)
Ending balance, shares at Nov. 30, 2020         104 590,279   442