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, 2022	$ 62	$ 605,841	$ (431,377)	$ 174,526
Beginning balance, shares at Apr. 30, 2022	61,807
Common stock issued under equity compensation plans		1,578		1,578
Common stock issued under equity compensation plans, shares	501
Stock-based compensation expense		4,683		4,683
Net income (as restated)			841	841
Ending balance, value at Oct. 31, 2022	$ 62	612,102	(430,536)	181,628
Ending balance, shares at Oct. 31, 2022	62,308
Beginning balance, value at Jul. 31, 2022	$ 62	608,750	(430,016)	178,796
Beginning balance, shares at Jul. 31, 2022	62,165
Common stock issued under equity compensation plans		566		566
Common stock issued under equity compensation plans, shares	143
Stock-based compensation expense		2,786		2,786
Net income (as restated)			(520)	(520)
Ending balance, value at Oct. 31, 2022	$ 62	612,102	(430,536)	181,628
Ending balance, shares at Oct. 31, 2022	62,308
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 income (as restated)			(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 income (as restated)			(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