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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 9 Months Ended
Jan. 31, 2025
Jan. 31, 2024
Cash flows from operating activities:    
Net loss $ (15,085,000) $ (20,761,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation of fixed assets 610,000 286,000
Foreign exchange (loss)/gain (1,000) 2,000
Loss on disposal of property and equipment 111,000
Amortization of intangible assets 99,000 114,000
Noncash lease expense 633,000 388,000
Accretion of discount on investments (277,000)
Change in contingent consideration liability (117,000)
Share-based compensation 1,331,000 803,000
Loss on extinguishment of debt 838,000
Loss on disposition of assets 210,000
Changes in operating assets and liabilities:    
Accounts receivable (830,000) 120,000
Contract assets (460,000) (129,000)
Inventory 366,000 (2,416,000)
Other assets 996,000 (2,933,000)
Accounts payable (2,731,000) 512,000
Earnout payable (150,000) (500,000)
Accrued expenses 453,000 894,000
Right-of-use liabilities (506,000) (397,000)
Contract liabilities (302,000) (510,000)
Net cash used in operating activities (14,628,000) (24,711,000)
Cash flows from investing activities:    
Redemptions of short-term investments 31,625,000
Purchases of short-term investments (7,935,000)
Purchases of property and equipment (350,000) (1,224,000)
Net cash (used in)/provided by investing activities (350,000) 22,466,000
Cash flows from financing activities:    
Cash paid for tax withholding related to shares withheld (649,000) (13,000)
Proceeds from on convertible notes 3,171,000
Proceeds from issuance of common stock - At The Market offering, net of issuance costs 16,880,000 29,000
Proceeds from issuance of common stock - Capital Raise, net of issuance costs 2,451,000  
Net cash provided by financing activities 21,853,000 16,000
Net increase (decrease) in cash, cash equivalents and restricted cash 6,875,000 (2,229,000)
Cash, cash equivalents and restricted cash, beginning of period 3,305,000 7,103,000
Cash, cash equivalents and restricted cash, end of period 10,180,000 4,874,000
Supplemental disclosure of noncash investing and financing activities:    
Common stock issued related to bonus and earnout payments 630,000 1,250,000
Common stock issued related to conversion of convertible debt 15,000
Operating right of use asset obtained in exchange for operating lease liability $ 1,247,000