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Business Segment Information - Operating Results by Business Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Apr. 30, 2017 | Apr. 30, 2016
Segment Reporting Information [Line Items] |  |
Net revenue | $ 15,411 | $ 11,182
Sales and marketing costs | (3,261) | (3,445)
Stock compensation expense | (2,662) | (2,599)
Consolidated |  |
Segment Reporting Information [Line Items] |  |
Net revenue | 15,411 | 11,182
Direct cost of services | (9,649) | (8,628)
Sales and marketing costs | (3,060) | (3,247)
Other operating expenses | (6,849) | (7,024)
Stock compensation expense | (2,662) | (2,599)
Segment loss | (6,809) | (10,316)
Operating Segments | Personalized Oncology Solutions (POS) |  |
Segment Reporting Information [Line Items] |  |
Net revenue | 1,720 | 1,972
Direct cost of services | (1,431) | (2,075)
Sales and marketing costs | (540) | (833)
Other operating expenses | 0 | 0
Stock compensation expense | 0 | 0
Segment loss | (251) | (936)
Operating Segments | Translational Oncology Solutions (TOS) |  |
Segment Reporting Information [Line Items] |  |
Net revenue | 13,691 | 9,210
Direct cost of services | (8,218) | (6,553)
Sales and marketing costs | (2,520) | (2,414)
Other operating expenses | (4,077) | (3,886)
Stock compensation expense | 0 | 0
Segment loss | (1,124) | (3,643)
Unallocated Corporate Overhead |  |
Segment Reporting Information [Line Items] |  |
Net revenue | 0 | 0
Direct cost of services | 0 | 0
Sales and marketing costs | 0 | 0
Other operating expenses | (2,772) | (3,138)
Stock compensation expense | (2,662) | (2,599)
Segment loss | $ (5,434) | $ (5,737)

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