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Revenue from Contracts with Customers (Tables)
3 Months Ended
Jul. 31, 2021
Revenue from Contract with Customer [Abstract]  
Summary of disaggregation of revenue
The following tables represents disaggregated revenue for the three months ended July 31, 2021 and 2020:
Three Months Ended
July 31,
 20212020
Pharmacology services$10,703 $9,412 
Other TOS revenue526 21 
Personalized oncology services24 113 
Total oncology services revenue$11,253 $9,547