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Segment Information - Summary of Segment Activity (Details) - USD ($)
$ in Thousands
3 Months Ended
Jul. 31, 2017
Jul. 31, 2016
Segment Reporting Information [Line Items]    
Net revenue $ 5,033 $ 3,670
Sales and marketing costs (683) (925)
Stock- based compensation expense (564) (1,129)
Consolidated [Member]    
Segment Reporting Information [Line Items]    
Net revenue 5,033 3,670
Direct cost of services (2,615) (2,477)
Sales and marketing costs (649) (757)
Other operating expenses (1,824) (1,830)
Stock- based compensation expense (564) (1,129)
Segment profit (loss) (619) (2,523)
Operating Segments [Member] | Personalized Oncology Solutions [Member]    
Segment Reporting Information [Line Items]    
Net revenue 439 511
Direct cost of services (386) (472)
Sales and marketing costs (86) (141)
Other operating expenses 0 0
Stock- based compensation expense 0 0
Segment profit (loss) (33) (102)
Operating Segments [Member] | Translational Oncology Solutions [Member]    
Segment Reporting Information [Line Items]    
Net revenue 4,594 3,159
Direct cost of services (2,229) (2,005)
Sales and marketing costs (563) (616)
Other operating expenses (1,038) (1,126)
Stock- based compensation expense 0 0
Segment profit (loss) 764 (588)
Corporate, Non-Segment [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 (786) (704)
Stock- based compensation expense (564) (1,129)
Segment profit (loss) $ (1,350) $ (1,833)