Quarterly report pursuant to Section 13 or 15(d)

Consolidated Statements of Stockholders' (Deficit)

v3.22.2.2
Consolidated Statements of Stockholders' (Deficit) - USD ($)
shares in Thousands, $ in Thousands
Preferred Stock
Series C Convertible Preferred Stock
Preferred Stock
Common Stock
Series C Convertible Preferred Stock
Common Stock
Private Warrant Exchange [Member]
Common Stock
Private Equity Offering
Common Stock
Treasury Stock
Additional Paid-in Capital
Series C Convertible Preferred Stock
Additional Paid-in Capital
Private Warrant Exchange [Member]
 [1]
Additional Paid-in Capital
Private Equity Offering
Additional Paid-in Capital
Accumulated Deficit
Private Warrant Exchange [Member]
 [1]
Private Equity Offering
Total
Beginning balance at May. 31, 2021           $ 626         $ 532,031 [1] $ (553,675) [1]     $ (21,018) [1]
Beginning balance (shares) at May. 31, 2021   96       626,123 443                
Issuance of stock for convertible note repayment           $ 12         13,832 [1]       13,844 [1]
Issuance of stock for convertible note repayment (in shares)           11,816                  
Loss on induced conversion                     18,530 [1]       18,530 [2]
Issuance of legal settlement, warrants [1]                     1,744       1,744
Stock option exercises [1]                     189       189
Stock option exercises (in shares)           300                  
Stock issued for bonuses and tendered for income tax           $ 1         (1) [1]        
Stock issued for bonuses and tendered for income tax (in shares)           1,014                  
Stock issued for private offerings         $ 3         $ 2,869 [1]       $ 2,872 [1]  
Stock issued for private offerings (in shares)         2,872                    
Warrant exercises       $ 1   $ 1     $ 774   502 [1]   $ 775   503 [1]
Warrant exercises (in shares)       1,327   668                  
Inducement interest expense related to private warrant exchange [1]                     528       528
Accrued preferred stock dividends [1]                       (420)     (420)
Stock-based compensation [1]                     2,597       2,597
Net loss                       (45,337) [1]     (45,337) [2]
Ending balance at Aug. 31, 2021           $ 644         573,595 [1] (599,432) [1]     (25,193) [1]
Ending balance (shares) at Aug. 31, 2021   96       644,120 443                
Beginning balance at May. 31, 2021           $ 626         532,031 [1] (553,675) [1]     (21,018) [1]
Beginning balance (shares) at May. 31, 2021   96       626,123 443                
Ending balance at May. 31, 2022           $ 720         671,013 (766,131)     (94,398)
Ending balance (shares) at May. 31, 2022   35       720,028 443                
Stock issued for compensation           $ 1         344       $ 345
Stock issued for compensation (in shares)           879                  
Stock issued for private offerings         $ 85         $ 17,459       $ 17,544  
Stock issued for private offerings (in shares)         85,378                   4,600
Issuance costs related to stock issued for private offerings                     (6,289)       $ (6,289)
Conversion of Series C convertible preferred stock to common stock     $ 1         $ (1)              
Conversion of Series C convertible preferred stock to common stock (in shares) (1)   1,136                        
Warrant exercises           $ 1         263       $ 264
Warrant exercises (in shares)           657                 500
Deemed dividend paid in common stock due to down round provision, recorded in additional paid-in capital           $ 5         (5)        
Deemed dividend paid in common stock due to down round provision recorded in additional paid-in capital (in share)           4,620                  
Accrued preferred stock dividends                     (384)       $ (384)
Change of fair value of liability-classified equity instrument upon reclassification                     8,601       8,601
Stock-based compensation                     996       996
Reclassification to additional paid-in capital of prior period preferred stock dividends previously charged to accumulated deficit                     (4,265) 4,265      
Net loss                       (20,991)     (20,991)
Ending balance at Aug. 31, 2022           $ 813         $ 687,732 $ (782,857)     $ (94,312)
Ending balance (shares) at Aug. 31, 2022   34       812,698 443                
[1] See Note 2, Summary of Significant Accounting Policies.
[2] See Note 2, Summary of Significant Accounting Policies.