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Leases - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2023 | Oct. 31, 2022 | Oct. 31, 2023 | Oct. 31, 2022
Lessee, Lease, Description [Line Items] |  |  |  |
Operating leases, rent expense | $ 454 | $ 466 | $ 907 | $ 934
Weighted average remaining lease term (in years) | 5 years 2 months 19 days |  | 5 years 2 months 19 days |
Weighted average discount rate, percent | 5.87% |  | 5.87% |
Corporate Headquarters |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Operating leases, rent expense | $ 19 | 21 | $ 38 | 42
Rockville, MD |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Operating leases, rent expense | 423 | 422 | 846 | 844
Milan Italy |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Operating leases, rent expense | $ 13 | $ 23 | $ 26 | $ 48

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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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