Revenue from Contracts with Customers (Tables)

3 Months Ended

Jul. 31, 2018

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The following tables represents disaggregated revenue for the three months ended July 31, 2018 and 2017:

	Three Months Ended July 31,
	2018		2017
Pharmacology services	$	5,777	$	4,480
Personalized oncology services	359		439
Other	89		114
Total Oncology services revenue	$	6,225	$	5,033