XML 43 R33.htm IDEA: XBRL DOCUMENT v3.22.2.2
Background, Basis of Presentation and Liquidity (Details Narrative) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 8 Months Ended
Jan. 10, 2022
Dec. 23, 2020
Dec. 04, 2020
Sep. 18, 2020
Apr. 08, 2019
Jul. 31, 2022
Jul. 31, 2021
Jul. 31, 2021
Apr. 30, 2022
Nov. 20, 2020
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                    
Net loss           $ 5,852 $ 3,079      
Cash in operations           5,092 $ 5,287      
Accumulated deficit           259,622     $ 253,770  
Cash           9,400        
Short-term investments           $ 42,700        
Number of common stock shares sold         1,542,000          
2020 ATM Facility [Member]                    
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                    
Proceeds from initial public offering $ 25,000                  
Proceeds from issuance or sale of equity, net of issuance costs $ 75,000                  
2020 ATM Facility [Member] | Alliance Global Partners [Member]                    
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                    
Offering amount capacity                   $ 100,000
Proceeds from initial public offering     $ 50,000              
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    
Payment of sales commission               $ 1,600    
Stock Purchase Agreement [Member] | Aspire Capital Fund, LLC [Member]                    
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]                    
Number of common stock shares sold           3,722,251        
Proceeds from issuance or sale of equity, net of issuance costs           $ 11,800        
Combined purchase price per share           $ 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                
Proceeds from issuance or sale of equity, net of issuance costs           $ 1,000