CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2024	Jul. 31, 2023
Cash flows from operating activities:
Net loss	$ (5,534)	$ (2,122)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	2,824	2,649
Stock-based compensation	2,665	2,343
Amortization of debt issuance costs	305	339
Deferred income taxes	0	(620)
Loss on disposal of property and equipment	0	46
Changes in operating assets and liabilities:
Accounts receivable, net	(4,318)	2,089
Contract assets	(1,845)	(4,845)
Inventory	1,179	3,042
Prepaid expenses and other assets	830	(131)
Accounts payable	(451)	4,684
Accrued compensation and benefits	171	(4,113)
Contract liabilities	(2,228)	(4,333)
Other accrued expenses and liabilities	2,722	736
Net cash used in operating activities	(3,680)	(236)
Cash flows from investing activities:
Purchase of property and equipment	(1,311)	(14,156)
Net cash used in investing activities	(1,311)	(14,156)
Cash flows from financing activities:
Proceeds from issuance of common stock under equity compensation plans	616	878
Principal payments on finance leases	(350)	(130)
Net cash provided by financing activities	266	748
Net decrease in cash and cash equivalents	(4,725)	(13,644)
Cash and cash equivalents, beginning of period	38,106	38,892
Cash and cash equivalents, end of period	33,381	25,248
Supplemental disclosures of cash flow information:
Cash paid for interest	173	27
Cash paid for income taxes	31	12
Supplemental disclosures of non-cash activities:
Unpaid purchases of property and equipment	1,807	7,636
Unpaid interest capitalized as construction-in-progress	$ 1,281	$ 93