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Commitments and Contingencies (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2022 | Jan. 31, 2021 | Jan. 31, 2022 | Apr. 30, 2021
Long-term Purchase Commitment [Line Items] |  |  |  |
Royalty expense | $ 87 | $ 32 | $ 286 | $ 127
Minimum |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
Royalty fee per tumor sample |  |  | $ 0 |
Royalty payment, as percent of contract price |  |  | 2.00% |
Maximum |  |  |  |
Long-term Purchase Commitment [Line Items] |  |  |  |
Royalty fee per tumor sample |  |  | $ 10 |
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 http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 + Details
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