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Leases - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2023 | Apr. 30, 2022
Lessee, Lease, Description [Line Items] |  |
Operating leases, rent expense | $ 1,900 | $ 1,900
Operating lease right-of-use assets, net | 7,318 | 8,230
Present value of minimum lease payments | 8,599 |
Operating lease right-of-use assets | 952 | 786
Operating lease liabilities | $ (907) | (631)
Weighted average remaining lease term | 5 years 8 months 12 days |
Weighted average discount rate | 5.82% |
Corporate Headquarters |  |
Lessee, Lease, Description [Line Items] |  |
Operating leases, rent expense | $ 83 | 88
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 | 98 | $ 81
Operating lease right-of-use assets, net | 231 |
Present value of minimum lease payments | 231 |
Milan, Italy (Office Space) |  |
Lessee, Lease, Description [Line Items] |  |
Operating lease right-of-use assets | 41 |
Operating lease liabilities | 41 |
Milan, Italy (Laboratory Space) |  |
Lessee, Lease, Description [Line Items] |  |
Operating lease right-of-use assets | 20 |
Operating lease liabilities | $ 20 |

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- Definition Amount of increase (decrease) in obligation for operating lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (g)(1) -SubTopic 20 -Topic 842 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-4 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-3 + Details
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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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