Leases - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2025	Oct. 31, 2024	Oct. 31, 2025	Oct. 31, 2024
Lessee, Lease, Description [Line Items]
Operating leases, rent expense	$ 454	$ 454	$ 907	$ 907
Gain (loss) on termination of lease			$ 9	$ 0
Weighted average remaining lease term (in years)	3 years 3 months 3 days	4 years 2 months 26 days	3 years 3 months 3 days	4 years 2 months 26 days
Weighted average discount rate, percent	5.83%	5.88%	5.83%	5.88%
Corporate Headquarters
Lessee, Lease, Description [Line Items]
Operating leases, rent expense	$ 19	$ 19	$ 38	$ 38
Rockville, MD
Lessee, Lease, Description [Line Items]
Operating leases, rent expense	422	422	843	843
Milan Italy
Lessee, Lease, Description [Line Items]
Operating leases, rent expense	13	$ 13	$ 25	$ 25
Right-of-use asset, decrease for lease termination	108
Current lease liability, decrease for lease termination	16
Non-current lease liability, decrease for lease termination	101
Gain (loss) on termination of lease	$ 9