CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2023	Jul. 31, 2022
Cash flows from operating activities:
Net income (loss)	$ (2,122)	$ 1,361
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Stock-based compensation	2,343	1,897
Depreciation and amortization	2,649	1,590
Amortization of debt issuance costs	339	260
Deferred income taxes	(620)	562
Loss on disposal of property and equipment	46	34
Changes in operating assets and liabilities:
Accounts receivable, net	2,089	(5,398)
Contract assets	(4,845)	(1,709)
Inventory	3,042	(4,292)
Prepaid expenses and other assets	(131)	(355)
Accounts payable	4,684	4,242
Accrued compensation and benefits	(4,113)	(3,118)
Contract liabilities	(4,333)	(1,023)
Other accrued expenses and liabilities	736	860
Net cash used in operating activities	(236)	(5,089)
Cash flows from investing activities:
Purchase of property and equipment	(14,156)	(6,869)
Net cash used in investing activities	(14,156)	(6,869)
Cash flows from financing activities:
Proceeds from issuance of common stock under equity compensation plans	878	1,012
Principal payments on finance lease	(130)	(83)
Net cash provided by financing activities	748	929
Net decrease in cash, cash equivalents and restricted cash	(13,644)	(11,029)
Cash, cash equivalents and restricted cash, beginning of period	38,892	126,516
Cash, cash equivalents and restricted cash, end of period	25,248	115,487
Supplemental disclosures of cash flow information:
Cash paid for interest	27	23
Cash paid for income taxes	12	40
Supplemental disclosures of non-cash activities:
Unpaid purchases of property and equipment	$ 7,729	$ 16,674