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Leases (Details) - USD ($) |  |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 | May 01, 2018 | Jul. 31, 2020 | Apr. 30, 2020 | Apr. 30, 2019 | Jun. 01, 2020 | Jul. 31, 2019 | May 01, 2019
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |
Operating lease right-of-use assets, net |  |  |  | $ 2,798,000 |  |  |  | $ 3,201,000
Discount rate |  |  |  |  |  |  |  | 7.25%
Weighted average remaining lease term |  |  |  |  |  |  | 6 years 10 months 21 days |
Weighted average discount rate |  |  |  |  |  |  | 7.25% |
Operating leases, rent expense |  |  |  | 955,000 |  |  |  |
Operating leases, rent expense |  |  |  |  | $ 822,000 |  |  |
Gaithersburg, MD |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |
Termination period |  | 7 days |  |  |  |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |
Operating lease right-of-use assets, net |  |  |  |  |  |  |  | $ 3,200,000
Advance rent |  |  |  |  |  |  |  | 900,000
Operating lease, liability |  |  |  |  |  |  |  | $ 4,100,000
Weighted average remaining lease term |  |  |  |  |  |  |  | 7 years 8 months 5 days
Weighted average discount rate |  |  |  |  |  |  |  | 7.25%
Corporate Headquarters |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |
Operating leases, rent expense |  |  |  | 94,000 |  |  |  |
Operating leases, rent expense |  |  |  |  | 91,000 |  |  |
Rockville, MD |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |
Operating leases, rent expense |  |  |  | 604,000 |  |  |  |
Operating leases, rent expense |  |  |  |  | 604,000 |  |  |
Gaithersburg, MD |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |
Operating leases, rent expense |  |  |  | 0 |  |  |  |
Operating leases, rent expense |  |  |  |  | 41,000 |  |  |
Rockville, MD New Location |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |
Operating leases, rent expense |  |  |  | $ 257,000 |  |  |  |
Operating leases, rent expense |  |  |  |  | $ 86,000 |  |  |
Subsequent Event | Rockville, MD |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |
Operating lease right-of-use assets, net |  |  | $ 118,000 |  |  | $ 3,800,000 |  |
Operating lease, liability |  |  | 125,000 |  |  | $ 3,800,000 |  |
Operating lease, cost |  |  | $ 7,000 |  |  |  |  |
Subsequent Event | Rockville, MD New Location |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |
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 at the balance sheet date that has been received by the entity that represents rents paid in advance. + References No definition available. + Details
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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=77888415&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=77888426&loc=SL77918673-209980 + Details
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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + 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=77888399&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 (b) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + 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=77888399&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=77888426&loc=SL77918686-209980 + Details
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