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Leases - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2025 | Apr. 30, 2024
Lessee, Lease, Description [Line Items] |  |
Operating leases, rent expense | $ 1,800 | $ 1,800
Weighted average remaining lease term (in years) | 3 years 9 months | 4 years 8 months 12 days
Weighted average discount rate, percent | 5.89% | 5.88%
Corporate Headquarters |  |
Lessee, Lease, Description [Line Items] |  |
Operating leases, rent expense | $ 75 | $ 77
Rockville, MD |  |
Lessee, Lease, Description [Line Items] |  |
Operating leases, rent expense | 1,700 | 1,700
Milan, Italy |  |
Lessee, Lease, Description [Line Items] |  |
Operating leases, rent expense | $ 50 | $ 50

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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 4 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-4 + Details
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- Definition Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 53 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479589/842-20-55-53 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details
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