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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Oct. 31, 2024
Oct. 31, 2023
Cash flows from operating activities:    
Net loss $ (8,365,000) $ (14,252,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation of fixed assets 456,000 172,000
Foreign exchange (loss)/gain (1,000) 1,000
Loss on disposal of property and equipment 111,000
Amortization of intangible assets 66,000 80,000
Noncash lease expense 418,000 201,000
Accretion of discount on investments (211,000)
Change in contingent consideration liability (86,000)
Share-based compensation 551,000 673,000
Changes in operating assets and liabilities:    
Accounts receivable (989,000) 229,000
Contract assets (68,000) (174,000)
Inventory (231,000) (1,502,000)
Other assets 1,064,000 (511,000)
Accounts payable (3,015,000) 802,000
Earnout payable (100,000) (500,000)
Accrued expenses (359,000) (2,000)
Right-of-use liabilities (245,000) (201,000)
Contract liabilities (183,000) (214,000)
Net cash used in operating activities (10,890,000) (15,495,000)
Cash flows from investing activities:    
Redemptions of short-term investments 20,600,000
Purchases of short-term investments (8,026,000)
Purchases of property and equipment (128,000) (698,000)
Net cash (used in)/provided by investing activities (128,000) 11,876,000
Cash flows from financing activities:    
Cash paid for tax withholding related to shares withheld (2,000)
Proceeds from issuance of common stock - At The Market offering, net of issuance costs 7,508,000 29,000
Proceeds from issuance of common stock - Capital Raise, net of issuance costs 2,451,000  
Net cash provided by financing activities 9,959,000 27,000
Net decrease in cash, cash equivalents and restricted cash (1,059,000) (3,592,000)
Cash, cash equivalents and restricted cash, beginning of period 3,305,000 7,103,000
Cash, cash equivalents and restricted cash, end of period 2,246,000 3,511,000
Supplemental disclosure of noncash investing and financing activities:    
Common stock issued related to bonus and earnout payments $ 630,000 $ 1,250,000