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Leases - Future Minimum Lease Payments (Details) - USD ($) $ in Thousands | Apr. 30, 2020 | Apr. 30, 2019
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Lessee, Operating Lease, Liability, Payment, Due [Abstract] |  |
2021 | $ 1,697 |
2022 | 1,851 |
2023 | 1,818 |
2024 | 1,844 |
2025 | 1,867 |
Thereafter | 7,268 |
Total | $ 16,345 |
Future Minimum Lease Payments [Abstract] |  |
2020 |  | $ 1,471
2021 |  | 1,445
2022 |  | 1,404
2023 |  | 1,419
2024 |  | 1,002
Thereafter |  | 3,398
Total |  | $ 10,139

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- Definition Amount of lessee's undiscounted obligation for lease payments for operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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- Definition Amount of lessee's undiscounted obligation for lease payments for operating lease, due after fifth fiscal year following latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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