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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2022
Apr. 30, 2021
Cash flows from operating activities:    
Net loss $ (18,874) $ (14,760)
Adjustments to reconcile net loss to net cash used in operating activities:    
Foreign exchange (gain) / loss 1 (15)
Depreciation of fixed assets 144 143
Amortization of intangibles 86 6
Amortization of right of use asset 285 223
Amortization of premium on investments 58
Gain on forgiveness of PPP loan (890)
Loss on liquidation of subsidiary  157
Compensation expense related to equity compensation 1,169 721
Deferred tax liabilities (377)
Performance obligation shares compensation (60) 60
Net effect from disposal of property, plant and equipment 2
Accounts receivable (133) (245)
Contract assets (195) 61
Inventory (292)
Other assets 19 106
Accounts payable 217 441
Accrued expenses (1,004) 761
Litigation payable (1,224) 1,224
Change in right of use lease liability (309) (237)
Contract liabilities (74) (165)
Net cash used in operating activities (21,296) (11,674)
Cash flows from investing activities:    
Cash acquired in acquisition 100
Purchase of short-term investments (49,442)
Purchase of property, plant and equipment (145) (26)
Payment for MAR acquisition, net of cash acquired (4,444)  
Net cash (used in) provided by investing activities (54,031) 74
Cash flows from financing activities:    
Proceeds from Paycheck Protection Program Loan 890
Proceeds from loan payable 467
Payment of loan payable (467)
Proceeds from stock option exercises 90 184
Payment of payroll taxes related to stock option exercises (245)
Proceeds from issuance of common stock- Aspire financing net of issuance costs 14,393
Proceeds from issuance of common stock- AGP At The Market offering, net of issuance costs 66,166
Proceeds associated with exercise of common stock warrants 2,818
Acquisition of treasury stock (3) (36)
Net cash provided by financing activities 87 84,170
Effect of exchange rate changes on cash, cash equivalents and restricted cash (32) 134
Net (decrease) / increase in cash, cash equivalents and restricted cash (75,272) 72,704
Cash, cash equivalents and restricted cash, beginning of year 83,634 10,930
Cash, cash equivalents and restricted cash, end of year 8,362 83,634
Supplemental disclosure of noncash investing and financing activities:    
Acquisition of property, plant and equipment through accounts payable 6
Issuance of stock for acquisition 5,855 477
Contingent liability - MAR $ 1,591