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Leases (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Oct. 31, 2020 | Jul. 31, 2020 | Oct. 31, 2019 | Oct. 31, 2020 | Oct. 31, 2019 | Jun. 01, 2020 | Apr. 30, 2020
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |
Operating leases, rent expense |  | $ 314,000 |  | $ 239,000 | $ 629,000 | $ 477,000 |  |
Operating lease right-of-use assets, net |  | $ 5,527,000 |  |  | 5,527,000 |  |  | $ 2,798,000
Gain (loss) on termination of lease |  |  |  |  | $ 75,000 | 0 |  |
Weighted average remaining lease term (in years) |  | 8 years 2 months 12 days |  |  | 8 years 2 months 12 days |  |  |
Discount rate (in percent) |  | 6.08% |  |  | 6.08% |  |  |
Corporate Headquarters |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |
Operating leases, rent expense |  | $ 24,000 |  | 24,000 | $ 44,000 | 47,000 |  |
Rockville, MD |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |
Operating leases, rent expense |  | 290,000 |  | 151,000 | 534,000 | 302,000 |  |
Operating lease right-of-use assets, net |  |  | $ 118,000 |  |  |  | $ 3,800,000 |
Operating lease liability |  |  | 125,000 |  |  |  | $ 3,800,000 |
Incremental rent expense |  |  | $ 8,000 |  |  |  |  |
Rockville, MD New Location |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |
Operating leases, rent expense |  | $ 0 |  | $ 64,000 | $ 43,000 | $ 128,000 |  |
Operating lease right-of-use assets, net | $ 850,000 |  |  |  |  |  |  |
Operating lease liability | 926,000 |  |  |  |  |  |  |
Gain (loss) on termination of lease | $ 76,000 |  |  |  |  |  |  |

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- Definition Amount of gain (loss) on termination of lease before expiration of lease term. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 40 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121604053&loc=SL77918607-209975 + 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 No definition available. + Details
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- Definition Discount rate used by lessee to determine present value of operating lease payments. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=121609121&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 http://asc.fasb.org/extlink&oid=121603541&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 http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(3) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 + Details
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