CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 560	$ 127,672	$ 11,212
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Stock-based compensation	10,978	7,380	3,854
Depreciation and amortization	7,210	4,480	3,453
Amortization of debt discount and issuance costs	1,046	1,030	916
Deferred income taxes	1,443	(115,082)	0
Loss on disposal and/or impairment of property and equipment	139	381	0
Changes in operating assets and liabilities:
Accounts receivable, net	2,249	(1,705)	(10,236)
Contract assets	(4,240)	743	(2,812)
Inventory	(17,846)	(14,191)	(988)
Prepaid expenses and other assets	(61)	(4,232)	(1,260)
Accounts payable	964	(943)	(608)
Accrued compensation and benefits	362	(376)	5,775
Contract liabilities	(16,446)	3,029	21,649
Other accrued expenses and liabilities	755	1,279	227
Net cash (used in) provided by operating activities	(12,887)	9,465	31,182
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of property and equipment	(77,638)	(56,411)	(9,864)
Net cash used in investing activities	(77,638)	(56,411)	(9,864)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock under equity compensation plans	3,406	3,359	3,984
Proceeds from issuance of common stock, net of issuance costs	0	0	32,141
Proceeds from issuance of convertible senior notes, net of issuance costs	0	0	138,464
Purchases of capped calls related to convertible senior notes	0	0	(12,837)
Repayment of note payable	0	0	(4,379)
Dividends paid on preferred stock	0	0	(4,455)
Redemption of preferred stock	0	0	(37,051)
Impact of preferred stock redemption	0	0	(3,439)
Principal payments on finance leases	(505)	(162)	(93)
Net cash provided by financing activities	2,901	3,197	112,335
Net (decrease) increase  in cash, cash equivalents and restricted cash	(87,624)	(43,749)	133,653
Cash, cash equivalents and restricted cash, beginning of period	126,516	170,265	36,612
Cash, cash equivalents and restricted cash, end of period	38,892	126,516	170,265
Supplemental disclosures of cash flow information:
Cash paid for interest	1,118	1,670	5
Cash paid for income taxes	260	64	0
Supplemental disclosures of non-cash activities:
Unpaid purchases of property and equipment in accounts payable	$ 14,125	$ 1,190	$ 3,939