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Leases - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2025 | Jan. 31, 2024 | Jan. 31, 2025 | Jan. 31, 2024
Lessee, Lease, Description [Line Items] |  |  |  |
Operating leases, rent expense | $ 453 | $ 454 | $ 1,400 | $ 1,400
Weighted average remaining lease term (in years) | 4 years | 4 years 11 months 23 days | 4 years | 4 years 11 months 23 days
Weighted average discount rate, percent | 5.88% | 5.88% | 5.88% | 5.88%
Corporate Headquarters |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Operating leases, rent expense | $ 17 | $ 19 | $ 55 | $ 57
Rockville, MD |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Operating leases, rent expense | 422 | 423 | 1,300 | 1,300
Milan Italy |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Operating leases, rent expense | $ 13 | $ 13 | $ 38 | $ 38

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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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