CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Beginning balance, value at Apr. 30, 2023	$ 63	$ 620,224	$ (431,118)	$ 189,169
Beginning balance, shares at Apr. 30, 2023	62,692
Common stock issued under equity compensation plans		998		998
Common stock issued under equity compensation plans, shares	542
Stock-based compensation expense		4,809		4,809
Net loss			(11,643)	(11,643)
Ending balance, value at Oct. 31, 2023	$ 63	626,031	(442,761)	183,333
Ending balance, shares at Oct. 31, 2023	63,234
Beginning balance, value at Jul. 31, 2023	$ 63	623,445	(433,240)	190,268
Beginning balance, shares at Jul. 31, 2023	63,111
Common stock issued under equity compensation plans		120		120
Common stock issued under equity compensation plans, shares	123
Stock-based compensation expense		2,466		2,466
Net loss			(9,521)	(9,521)
Ending balance, value at Oct. 31, 2023	$ 63	626,031	(442,761)	183,333
Ending balance, shares at Oct. 31, 2023	63,234
Beginning balance, value at Apr. 30, 2024	$ 64	632,696	(571,871)	60,889
Beginning balance, shares at Apr. 30, 2024	63,568
Common stock issued under equity compensation plans		725		725
Common stock issued under equity compensation plans, shares	388
Stock-based compensation expense		6,134		6,134
Net loss			(22,940)	(22,940)
Ending balance, value at Oct. 31, 2024	$ 64	639,555	(594,811)	44,808
Ending balance, shares at Oct. 31, 2024	63,956
Beginning balance, value at Jul. 31, 2024	$ 64	635,977	(577,405)	58,636
Beginning balance, shares at Jul. 31, 2024	63,790
Common stock issued under equity compensation plans		109		109
Common stock issued under equity compensation plans, shares	166
Stock-based compensation expense		3,469		3,469
Net loss			(17,406)	(17,406)
Ending balance, value at Oct. 31, 2024	$ 64	$ 639,555	$ (594,811)	$ 44,808
Ending balance, shares at Oct. 31, 2024	63,956