Stock-based Payments - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Apr. 30, 2024	Apr. 30, 2023	Apr. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, Beginning Balance (in shares)	1,775,667	1,658,239
Granted (in shares)	444,730	186,720
Exercised (in shares)	(155,449)	(36,209)
Canceled (in shares)	(50,535)	(13,874)
Forfeited (in shares)	(40,750)	(14,625)
Expired (in shares)	(54,166)	(4,584)
Outstanding, Ending Balance (in shares)	1,919,497	1,775,667	1,658,239
Vested and expected to vest (in shares)	1,919,497	1,775,667
Exercisable (in shares)	1,484,895	1,438,807
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted Average Exercise Price, Outstanding, Beginning Balance (in usd per share)	$ 4.80	$ 4.51
Weighted Average Exercise Price, Granted (in usd per share)	6.08	7.22
Weighted Average Exercise Price, Exercised (in usd per share)	2.31	3.21
Weighted Average Exercise Price, Canceled (in usd per share)	4.82	3.93
Weighted Average Exercise Price, Forfeited (in usd per share)	6.21	7.94
Weighted Average Exercise Price, Expired (in usd per share)	12.78	5.40
Weighted Average Exercise Price, Outstanding, Ending Balance (in usd per share)	5.04	4.80	$ 4.51
Weighted Average Exercise Price, Vested and Expected to Vest (in usd per share)	5.04	4.80
Weighted Average Exercise Price, Exercisable (in usd per share)	$ 4.65	$ 4.35
Weighted Average Remaining Contractual Term, Outstanding, Beginning Balance (in years)		4 years 7 months 6 days	4 years 10 months 24 days
Weighted Average Remaining Contractual Life, Granted	9 years 6 months	9 years 4 months 24 days
Weighted Average Remaining Contractual Term, Outstanding, Ending Balance (in years)	5 years 2 months 12 days	4 years 7 months 6 days
Weighted Average Remaining Contractual Life (Years), Vested and expected to vest	5 years 2 months 12 days	4 years 7 months 6 days
Weighted Average Remaining Contractual Life (Years), Exercisable	4 years 2 months 12 days	3 years 9 months 18 days
Aggregate Intrinsic Value, Outstanding, Beginning Balance	$ 2,683	$ 6,131
Aggregate Intrinsic Value, Granted	0	0
Aggregate Intrinsic Value, Outstanding, Ending Balance	2,172	2,683	$ 6,131
Aggregate Intrinsic Value, Vested and expected to vest	2,172	2,683
Aggregate Intrinsic Value, Exercisable	$ 2,172	$ 2,681
Directors and Employees
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, Beginning Balance (in shares)	1,739,336	1,617,324
Granted (in shares)	444,730	186,720
Exercised (in shares)	(155,449)	(36,209)
Canceled (in shares)	(50,535)	(13,874)
Forfeited (in shares)	(40,750)	(14,625)
Expired (in shares)	(54,166)	0
Outstanding, Ending Balance (in shares)	1,883,166	1,739,336	1,617,324
Vested and expected to vest (in shares)	1,883,166	1,739,336
Exercisable (in shares)	1,481,145	1,436,932
Non- Employees
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, Beginning Balance (in shares)	36,331	40,915
Granted (in shares)	0	0
Exercised (in shares)	0	0
Canceled (in shares)	0	0
Forfeited (in shares)	0	0
Expired (in shares)	0	(4,584)
Outstanding, Ending Balance (in shares)	36,331	36,331	40,915
Vested and expected to vest (in shares)	36,331	36,331
Exercisable (in shares)	3,750	1,875