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Commitment and Contingencies (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2023 | Jan. 31, 2022 | Jan. 31, 2023 | Jan. 31, 2022
Commitments and Contingencies [Line Items] |  |  |  |
Royalty expense | $ 21,000 | $ 87,000 | $ 129,000 | $ 286,000
Minimum |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Royalty fee per tumor sample |  |  | $ 0 |
Royalty payment, as percent of contract price |  |  | 2.00% |
Maximum |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |
Royalty fee per tumor sample |  |  | $ 30,000 |
Royalty payment, as percent of contract price |  |  | 20.00% |

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- Definition Amount of expense related to royalty payments under a contractual arrangement such as payment for mineral and drilling rights and use of technology or intellectual property. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 + Details
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