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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Jul. 31, 2022
Jul. 31, 2021
Cash flows from operating activities:    
Net loss $ (5,852) $ (3,079)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation of fixed assets 43 40
Amortization of intangible assets 40 6
Amortization of right of use asset 75 69
Amortization of premium on marketable securities 220
Gain on extinguishment of PPP Loan (891)
Compensation expense related to equity compensation 333 390
Change in contingent liability consideration (131)
Changes in operating assets and liabilities:    
Accounts receivable 363 (96)
Contract assets (280) (114)
Inventory (146)
Other assets (13) (20)
Accounts payable 154 (233)
Accrued expenses 212 (60)
Change in right of use lease liability (82) (75)
Contract liabilities (28)
Litigation payable (1,224)
Net cash used in operating activities (5,092) (5,287)
Cash flows from investing activities:    
Redemptions of marketable securities 17,252
Purchase of marketable securities (10,813)
Purchase of property, plant and equipment (56) (7)
Net cash provided by (used in) investing activities 6,383 (7)
Cash flows from financing activities:    
Net cash provided by financing activities
Effect of exchange rate changes on cash, cash equivalents and restricted cash (14)
Net increase / (decrease) in cash, cash equivalents and restricted cash 1,291 (5,308)
Cash, cash equivalents and restricted cash, beginning of period 8,362 83,634
Cash, cash equivalents and restricted cash, end of period $ 9,653 $ 78,326