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Background, Basis of Presentation and Liquidity (Details Narrative) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 23, 2020
Nov. 20, 2020
Sep. 18, 2020
Oct. 24, 2019
Apr. 08, 2019
Jan. 07, 2019
Jan. 31, 2021
Jul. 31, 2021
Jul. 31, 2020
Apr. 30, 2021
ScheduleBackgroundBasisOfPresentationAndLiquidityLineItems [Line Items]                    
Net Income (Loss) Attributable to Parent               $ 3,079 $ 3,385 $ (14,800)
Net Cash Provided by (Used in) Operating Activities               5,287 $ 2,737 $ (11,700)
Cash               $ 77,700    
Number of common stock shares sold         1,542,000          
Common Stock, Shares Authorized               100,000,000   100,000,000
2019 ATM Facility [Member] | A.G.P Alliance Global Partners [Member]                    
ScheduleBackgroundBasisOfPresentationAndLiquidityLineItems [Line Items]                    
[custom:ProceedsFromInitialPublicOffering]           $ 25,000        
Number of common stock shares sold           17,595,472       12,342,506
Proceeds from issuance or sale of equity, net of issuance costs           $ 23,400       $ 18,700
Combined purchase price per share           $ 1.33       $ 1.51
[custom:PaymentOfSalesCommission]                   $ 800
Two Thousand Twenty ATM Facility [Member] | A.G.P Alliance Global Partners [Member]                    
ScheduleBackgroundBasisOfPresentationAndLiquidityLineItems [Line Items]                    
[custom:ProceedsFromInitialPublicOffering]   $ 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    
[custom:PaymentOfSalesCommission]               $ 1,600    
Stock Purchase Agreement [Member] | Aspire Capital Fund, LLC [Member]                    
ScheduleBackgroundBasisOfPresentationAndLiquidityLineItems [Line Items]                    
Number of common stock shares sold     6,424,205       3,722,251      
Proceeds from issuance or sale of equity, net of issuance costs     $ 4,000       $ 11,800 $ 1,000    
Combined purchase price per share     $ 0.63       $ 3.17      
Aggregate purchase of common stock     $ 12,500              
[custom:PercentageOfOutstandingCommonStockLimitForShareholderApproval] 19.99%   19.99%              
[custom:StockIssuedDuringPeriodSharesCanBeIssuedBasedUponOutstandingPercentage]     3,722,251              
[custom:NumberOfAdditionalSharesThatCanBeIssuedUponShareholderApproval] 9,864,706                  
Stock Purchase Agreement [Member] | Aspire Capital Fund, LLC [Member] | Maximum [Member]                    
ScheduleBackgroundBasisOfPresentationAndLiquidityLineItems [Line Items]                    
Aggregate purchase of common stock       $ 10,000            
Stock Purchase Agreement [Member] | Aspire Capital Fund, LLC [Member]                    
ScheduleBackgroundBasisOfPresentationAndLiquidityLineItems [Line Items]                    
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