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Leases - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Oct. 31, 2021 | Oct. 31, 2020 | Jul. 31, 2020 | Oct. 31, 2021 | Oct. 31, 2020 | Oct. 01, 2021 | Apr. 30, 2021 | Apr. 01, 2021 | Jun. 01, 2020 | Mar. 30, 2020
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating leases, rent expense |  | $ 467 | $ 314 |  | $ 932 | $ 629 |  |  |  |  |
Extension term |  |  |  |  |  |  |  |  |  |  | 6 months
Operating lease right-of-use assets, net |  | $ 8,261 |  |  | 8,261 |  |  | $ 8,521 |  |  |
Gain (loss) on termination of lease |  |  |  |  | $ 0 | 75 |  |  |  |  |
Weighted average remaining lease term (in years) |  | 7 years 2 months 23 days |  |  | 7 years 2 months 23 days |  |  |  |  |  |
Weighted average discount rate, percent |  | 5.76% |  |  | 5.76% |  |  |  |  |  |
Corporate Headquarters |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating leases, rent expense |  | $ 24 | 24 |  | $ 47 | 44 |  |  |  |  |
Rockville, MD |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating leases, rent expense |  | 292 | 290 |  | 591 | 534 |  |  |  |  |
Operating lease right-of-use assets, net |  |  |  |  |  |  |  |  |  | $ 3,800 | $ 118
Operating lease liability |  |  |  |  |  |  |  |  |  | $ 3,800 | $ 125
Incremental rent expense |  |  |  | $ 8 |  |  |  |  |  |  |
Additional Expansion Premises |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating leases, rent expense |  | 130 | 0 |  | 260 | 0 |  |  |  |  |
Operating lease right-of-use assets, net |  |  |  |  |  |  |  |  | $ 3,300 |  |
Operating lease liability |  |  |  |  |  |  |  |  | $ 3,300 |  |
Rockville, MD New Location |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating leases, rent expense |  | 0 | 0 |  | 0 | 43 |  |  |  |  |
Operating lease right-of-use assets, net | $ 850 |  |  |  |  |  |  |  |  |  |
Operating lease liability | 926 |  |  |  |  |  |  |  |  |  |
Gain (loss) on termination of lease | $ 75 |  |  |  |  |  |  |  |  |  |
Milan, Italy |  |  |  |  |  |  |  |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating leases, rent expense |  | $ 21 | $ 0 |  | $ 34 | $ 0 |  |  |  |  |
Operating lease right-of-use assets, net |  |  |  |  |  |  | $ 205 |  |  |  |

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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=123386189&loc=SL77918607-209975 + Details
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