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Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2022 | Jan. 31, 2021 | Jan. 31, 2022 | Jan. 31, 2021
Disaggregation of Revenue [Line Items] |  |  |  |
Description of timing |  |  | The majority of the Company's revenue arrangements are service contracts that are complete within a year or less. There are a few contracts that range in duration between 1 and 3 years. |
Oncology services revenue | $ 13,193 | $ 10,812 | $ 36,232 | $ 30,476
Revenue Benchmark | Customer Concentration Risk | Pharmaceutical Services And Other TOS Customer |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Customer revenue (in Percent) | 11.00% | 10.00% | 14.00% | 10.00%
Pharmacology services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Oncology services revenue | $ 12,622 | $ 10,745 | $ 34,468 | $ 30,199
Other TOS revenue |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Oncology services revenue | 546 | 62 | 1,715 | 122
Personalized oncology services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Oncology services revenue | $ 25 | $ 5 | $ 49 | $ 155

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