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Revenue from Contracts with Customers (Tables)
 9 Months Ended
Jan. 31, 2020
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue
The following tables represents disaggregated revenue for the three and nine months ended January 31, 2020 and 2019:

 
Three Months Ended
January 31,
 
Nine Months Ended January 31,
 
2020

2019
 
2020
 
2019
Pharmacology services
$
8,843

 
$
5,988

 
$
22,732

 
$
18,037

Personalized oncology services
169

 
416

 
581

 
1,024

Other
—

 
26

 
62

 
287

Total oncology services revenue
$
9,012

 
$
6,430

 
$
23,375

 
$
19,348