Business Segment Information - Operating Results by Business Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2016	Apr. 30, 2015
Segment Reporting Information [Line Items]
Net revenue	$ 11,182	$ 8,863
Sales and marketing costs	(3,445)	(4,283)
Stock compensation expense	(2,599)	(3,162)
Consolidated [Member]
Segment Reporting Information [Line Items]
Net revenue	11,182	8,863
Direct cost of services	(8,628)	(7,588)
Sales and marketing costs	(3,247)	(3,722)
Other operating expenses	(7,024)	(7,629)
Stock compensation expense	(2,599)	(3,162)
Segment profit (loss)	(10,316)	(13,238)
Operating Segments [Member] | Personalized Oncology Solutions [Member]
Segment Reporting Information [Line Items]
Net revenue	1,972	1,663
Direct cost of services	(2,075)	(2,711)
Sales and marketing costs	(833)	(1,514)
Other operating expenses	0	0
Stock compensation expense	0	0
Segment profit (loss)	(936)	(2,562)
Operating Segments [Member] | Translational Oncology Solutions [Member]
Segment Reporting Information [Line Items]
Net revenue	9,210	7,200
Direct cost of services	(6,553)	(4,877)
Sales and marketing costs	(2,414)	(2,208)
Other operating expenses	(3,886)	(4,493)
Stock compensation expense	0	0
Segment profit (loss)	(3,643)	(4,378)
Unallocated Corporate Overhead [Member]
Segment Reporting Information [Line Items]
Net revenue	0	0
Direct cost of services	0	0
Sales and marketing costs	0	0
Other operating expenses	(3,138)	(3,136)
Stock compensation expense	(2,599)	(3,162)
Segment profit (loss)	$ (5,737)	$ (6,298)