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Background, Basis of Presentation and Liquidity (Details Narrative) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 31, 2022
Jul. 31, 2021
Dec. 23, 2020
Nov. 20, 2020
Sep. 18, 2020
Oct. 24, 2019
Apr. 08, 2019
Jan. 07, 2019
Jan. 31, 2022
Jan. 31, 2021
Jan. 31, 2022
Jan. 31, 2021
Apr. 30, 2021
Oct. 31, 2021
Jul. 01, 2019
Net loss                 $ 5,471 $ 3,151 $ 13,721 $ 9,560 $ 14,800    
Net cash in operating activities                     15,787 8,525 $ 11,700    
Cash $ 63,500               $ 63,500   63,500        
Proceeds from initial public offering                     $ 66,166      
Number of common stock shares sold             1,542,000                
Deferred Offering Costs       $ 100,000                      
A.G.P Alliance Global Partners [Member]                              
Number of common stock shares sold               12,342,506              
Proceeds from issuance or sale of equity, net of issuance costs               $ 18,700              
Combined purchase price per share                             $ 1.51
2019 ATM Facility [Member] | A.G.P Alliance Global Partners [Member]                              
Proceeds from initial public offering               $ 25,000              
Number of common stock shares sold               17,595,472              
Proceeds from issuance or sale of equity, net of issuance costs               $ 23,400              
Combined purchase price per share               $ 1.33              
Payment of sales commission               $ 800              
2020 ATM Facility [Member]                              
Proceeds from issuance or sale of equity, net of issuance costs                     75,000        
Payment of sales commission                     $ 25,000        
2020 ATM Facility [Member] | A.G.P Alliance Global Partners [Member]                              
Number of common stock shares sold                     17,179,883        
Proceeds from issuance or sale of equity, net of issuance costs                     $ 50,000        
Combined purchase price per share $ 2.91               $ 2.91   $ 2.91        
Payment of sales commission                     $ 1,600        
Proceeds from initial public offering       $ 50,000                      
Stock Purchase Agreement [Member] | Aspire Capital Fund, LLC [Member]                              
Number of common stock shares sold   3,722,251     6,424,205                    
Proceeds from issuance or sale of equity, net of issuance costs $ 1,000 $ 11,800     $ 4,000                    
Combined purchase price per share         $ 0.63                 $ 3.17  
Aggregate purchase of common stock         $ 12,500                    
Percentage of outstanding common stock     19.99%   19.99%                    
Shares can be issued based upon outstanding percentage         3,722,251                    
Additional sales of common stock shares sold     9,864,706                        
Stock Purchase Agreement [Member] | Aspire Capital Fund, LLC [Member] | Maximum [Member]                              
Aggregate purchase of common stock           $ 10,000                  
Stock Purchase Agreement One [Member] | Aspire Capital Fund, LLC [Member]                              
Number of common stock shares sold                         5,025,000    
Proceeds from issuance or sale of equity, net of issuance costs                         $ 2,900    
Combined purchase price per share                         $ 0.57