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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2021
Oct. 31, 2020
Apr. 30, 2021
Cash flows from operating activities:          
Net loss $ (5,171) $ (3,024) $ (8,250) $ (6,409) $ (14,800)
Adjustments to reconcile net loss to net cash used in operating activities:          
Foreign exchange loss (gain) 5 (3) 5 (10)  
Depreciation of fixed assets     70 73  
Amortization of intangible assets     12  
Amortization of right of use asset     139 105  
Loss on disposal of property, plant and equipment     2  
Gain on extinguishment of PPP Loan (891)  
Stock-based compensation 157 107 547 223  
Changes in operating assets and liabilities:          
Accounts receivable     170 105  
Contract assets     (135) 154  
Other assets     (73) (499)  
Accounts payable     (410) (72)  
Accrued expenses     (305) 812  
Change in lease liability     (147) (110)  
Contract liabilities     117 (56)  
Litigation payable     (1,224)  
Net cash used in operating activities     (10,375) (5,682) (11,700)
Cash flows from investing activities:          
Purchase of property, plant and equipment     (24)  
Net cash used in investing activities     (24)  
Cash flows from financing activities:          
Proceeds from Paycheck Protection Program Loan     890  
Proceeds from loan payable     467  
Payments of loan payable     (117)  
Proceeds from stock option exercises     21  
Proceeds from issuance of common stock- Aspire financing net of issuance costs     3,241  
Proceeds from issuance of common stock- AGP At The Market offering, net of issuance costs     6,094  
Net cash provided by financing activities     21 10,575  
Effect of exchange rate changes on cash, cash equivalents and restricted cash     (20) 27  
Net (decrease) / increase in cash, cash equivalents and restricted cash     (10,398) 4,920  
Cash, cash equivalents and restricted cash, beginning of period     83,634 10,930 10,930
Cash, cash equivalents and restricted cash, end of period $ 73,236 $ 15,850 73,236 15,850 $ 83,634
Supplemental disclosure of noncash operating activities:          
Prepaid financing costs reported in accrued expenses     $ 49