Segment Information - Summary of Segment Activity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 31, 2015
Segment Reporting Information [Line Items]
Net revenue	$ 4,457	$ 2,971	$ 8,126	$ 5,793
Sales and marketing costs	(717)	(834)	(1,643)	(1,863)
Stock- based compensation expense	(535)	(748)	(1,664)	(1,523)
Consolidated [Member]
Segment Reporting Information [Line Items]
Net revenue	4,457	2,971	8,126	5,793
Direct cost of services	(2,200)	(2,008)	(4,677)	(4,232)
Sales and marketing costs	(699)	(809)	(1,456)	(1,718)
Other operating expenses	(1,516)	(1,899)	(3,346)	(3,710)
Stock- based compensation expense	(535)	(748)	(1,664)	(1,523)
Segment profit (loss)	(493)	(2,493)	(3,017)	(5,390)
Operating Segments [Member] | Personalized Oncology Solutions [Member]
Segment Reporting Information [Line Items]
Net revenue	497	486	1,007	971
Direct cost of services	(374)	(567)	(845)	(1,202)
Sales and marketing costs	(128)	(189)	(269)	(521)
Other operating expenses	0	0	0	0
Stock- based compensation expense	0	0	0	0
Segment profit (loss)	(5)	(270)	(107)	(752)
Operating Segments [Member] | Translational Oncology Solutions [Member]
Segment Reporting Information [Line Items]
Net revenue	3,960	2,485	7,119	4,822
Direct cost of services	(1,826)	(1,441)	(3,832)	(3,030)
Sales and marketing costs	(571)	(620)	(1,187)	(1,197)
Other operating expenses	(964)	(873)	(2,090)	(1,806)
Stock- based compensation expense	0	0	0	0
Segment profit (loss)	599	(449)	10	(1,211)
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Net revenue	0	0	0	0
Direct cost of services	0	0	0	0
Sales and marketing costs	0	0	0	0
Other operating expenses	(552)	(1,026)	(1,256)	(1,904)
Stock- based compensation expense	(535)	(748)	(1,664)	(1,523)
Segment profit (loss)	$ (1,087)	$ (1,774)	$ (2,920)	$ (3,427)