Share-Based Payments - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Jul. 31, 2022	Apr. 30, 2022
Total
Outstanding, beginning balance (in shares)	1,658,239
Granted (in shares)	78,000
Forfeited (in shares)	(7,625)
Canceled (in shares)	(1,875)
Expired (in shares)	(4,584)
Outstanding, ending balance (in shares)	1,722,155	1,658,239
Vested and expected to vest (in shares)	1,722,155
Exercisable (in shares)	1,380,775
Weighted Average Exercise Price
Outstanding, beginning balance (in dollars per share)	$ 4.51
Granted (in dollars per share)	7.57
Forfeited (in dollars per share)	7.73
Canceled (in dollars per share)	4.63
Expired (in dollars per share)	5.40
Outstanding, ending balance (in dollars per share)	4.64	$ 4.51
Vested and expected to vest (in dollars per share)	4.64
Exercisable (in dollars per share)	$ 4.06
Weighted Average Remaining Contractual Life (Years)
Outstanding (in years)	4 years 10 months 24 days	4 years 10 months 24 days
Outstanding, granted (in years)	9 years 10 months 24 days
Vested and expected to vest (in years)	4 years 10 months 24 days
Exercisable (in years)	4 years 1 month 6 days
Aggregate Intrinsic Value
Outstanding	$ 7,462	$ 6,131
Vested and expected to vest	7,462
Exercisable	$ 6,846
Directors and Employees
Total
Outstanding, beginning balance (in shares)	1,617,324
Granted (in shares)	78,000
Forfeited (in shares)	(7,625)
Canceled (in shares)	0
Expired (in shares)	(4,584)
Outstanding, ending balance (in shares)	1,683,115	1,617,324
Vested and expected to vest (in shares)	1,683,115
Exercisable (in shares)	1,380,775
Non- Employees
Total
Outstanding, beginning balance (in shares)	40,915
Granted (in shares)	0
Forfeited (in shares)	0
Canceled (in shares)	(1,875)
Expired (in shares)	0
Outstanding, ending balance (in shares)	39,040	40,915
Vested and expected to vest (in shares)	39,040
Exercisable (in shares)	0