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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jul. 31, 2021
Jul. 31, 2020
Apr. 30, 2021
Cash flows from operating activities:      
Net loss $ (3,079) $ (3,385) $ 14,800
Adjustments to reconcile net loss to net cash used in operating activities:      
Foreign exchange gain (8)  
Depreciation of fixed assets 40 37  
Amortization of intangible assets 6  
Amortization of right of use asset 69 52  
Gain on extinguishment of PPP Loan (891)  
Stock-based compensation 390 116  
Changes in operating assets and liabilities:      
Accounts receivable (96) 84  
Contract assets (114) (115)  
Other assets (20) 181  
Accounts payable (233) 8  
Accrued expenses (60) 381  
Change in lease liability (75) (54)  
Contract liabilities (34)  
Litigation Payable (1,224)  
Net cash used in operating activities (5,287) (2,737) 11,700
Cash flows from investing activities:      
Purchase of property, plant and equipment (7)  
Net cash used in investing activities (7)  
Cash flows from financing activities:      
Proceeds from Paycheck Protection Program Loan 890  
Proceeds from issuance of common stock- Aspire financing net of issuance costs 2,635  
Proceeds from issuance of common stock- AGP At The Market offering, net of issuance costs 243  
Net cash provided by financing activities 3,768  
Effect of exchange rate changes on cash, cash equivalents and restricted cash (14) 32  
Net (decrease) / increase in cash, cash equivalents and restricted cash (5,308) 1,063  
Cash, cash equivalents and restricted cash, beginning of period 83,634 10,930 10,930
Cash, cash equivalents and restricted cash, end of period 78,326 11,993 $ 83,634
Supplemental disclosure of noncash operating activities:      
Prepaid financing costs reported in accrued expenses $ 40