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Leases - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2022 | Jul. 31, 2021 | Jul. 31, 2020 | Apr. 30, 2022 | Apr. 01, 2021 | Jun. 01, 2020 | Mar. 30, 2020
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Operating leases, rent expense | $ 467 | $ 452 |  |  |  |  |
Extension term |  |  |  |  |  |  | 6 months
Operating lease right-of-use assets, net | 7,971 |  |  | $ 8,230 |  |  |
Present value of minimum lease payments | $ 9,226 |  |  |  |  |  |
Weighted average remaining lease term (in years) | 6 years 5 months 1 day |  |  |  |  |  |
Weighted average discount rate, percent | 5.73% |  |  |  |  |  |
Corporate Headquarters |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Operating leases, rent expense | $ 21 | 24 |  |  |  |  |
Rockville, MD |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Operating leases, rent expense | 422 | 422 |  |  |  |  |
Operating lease right-of-use assets, net |  |  | $ 118 |  |  | $ 3,800 |
Present value of minimum lease payments |  |  | 125 |  |  | $ 3,800 |
Incremental rent expense |  |  | $ 8 |  |  |  |
Additional Expansion Premises |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Operating lease right-of-use assets, net |  |  |  |  | $ 3,300 |  |
Present value of minimum lease payments |  |  |  |  | $ 3,300 |  |
Milan Italy |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |
Operating leases, rent expense | 23 | $ 0 |  |  |  |  |
Operating lease right-of-use assets, net | 205 |  |  |  |  |  |
Present value of minimum lease payments | $ 205 |  |  |  |  |  |

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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 No definition available. + Details
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- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI https://asc.fasb.org/extlink&oid=128292326&loc=SL77918673-209980 + Details
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- Definition Amount of operating lease expense. Excludes sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918638-209977 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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