Property and Equipment - Narrative (Details) - USD ($)	12 Months Ended
	Apr. 30, 2024	Apr. 30, 2023	Apr. 30, 2022
Property, Plant and Equipment [Line Items]
Depreciation and amortization	$ 1,900,000	$ 2,200,000
Finance lease, depreciation and amortization expenses	1,700,000	2,100,000
Assets under finance lease	1,000,000	1,000,000
Disposed of lab equipment		0
Accumulated depreciation	10,391,000	8,630,000
Loss on disposal of equipment	435,000	0
Servicing asset	1,900,000
Servicing asset at fair value, amount		807,000
Hosting arrangement, amortization expense	0	630,000
Finance lease, depreciation and amortization expense	146,000	135,000
2022 Finance Lease
Property, Plant and Equipment [Line Items]
Finance lease costs	$ 370,000		$ 370,000
Present value of minimum future obligations interest rate	3.25%
Finance lease, depreciation and amortization expense	$ 75,000	72,000
Interest on finance lease liability	6,000	8,000
2023 Finance Lease
Property, Plant and Equipment [Line Items]
Finance lease costs	$ 368,000	368,000
Present value of minimum future obligations interest rate	3.50%
Finance lease, depreciation and amortization expense	$ 71,000	63,000
Interest on finance lease liability	9,000	11,000
Finance Leased Assets
Property, Plant and Equipment [Line Items]
Depreciation	$ 146,000	$ 135,000
Capitalized software development costs
Property, Plant and Equipment [Line Items]
Useful life	3 years
Laboratory Equipment
Property, Plant and Equipment [Line Items]
Disposed of lab equipment	$ 542,000
Accumulated depreciation	107,000
Loss on disposal of equipment	$ 435,000