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Provision for (Benefit from) Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2024 | Apr. 30, 2023 | Apr. 30, 2022 | Apr. 30, 2013
Income Tax Disclosure [Abstract] |  |  |  |
Deferred tax assets, valuation allowance | $ 18,106 | $ 16,756 |  |
Deferred tax assets, valuation allowance, increase | 1,400 | 1,300 |  |
Operating loss carryforwards | 38,600 | 41,300 |  |
Operating loss, limitations on use | 432 |  |  | $ 12,000
Unrecognized tax benefits | $ 181 | $ 181 | $ 181 |

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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 217 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482663/740-10-55-217 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 15A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-15A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10B -Publisher FASB -URI https://asc.fasb.org/1943274/2147482525/740-10-45-10B + Details
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