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Revenue from Contracts with Customers (Tables) | 9 Months Ended
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Jan. 31, 2021
Revenue from Contract with Customer [Abstract] |
Summary of disaggregation of revenue | The following tables represents disaggregated revenue for the three and nine months ended January 31, 2021 and 2020:
| Three Months Ended January 31, |  | Nine Months Ended January 31,
| 2021 |  | 2020 |  | 2021 |  | 2020
Pharmacology services | $ | 10,745 |  |  | $ | 8,843 |  |  | $ | 30,199 |  |  | $ | 22,732 |
Personalized oncology services | 5 |  |  | 169 |  |  | 155 |  |  | 581 |
Other | 62 |  |  | — |  |  | 122 |  |  | 62 |
Total oncology services revenue | $ | 10,812 |  |  | $ | 9,012 |  |  | $ | 30,476 |  |  | $ | 23,375 |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130545-203045 + Details
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