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Business Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2013 | Oct. 31, 2012 | Oct. 31, 2013 | Oct. 31, 2012
Net revenue | $ 2,383 |  | $ 1,458 |  | $ 5,403 |  | $ 3,564 |
Sales and marketing costs | (698) |  | (680) |  | (1,340) |  | (1,389) |
Stock- based compensation expense | (476) |  | (624) |  | (1,028) |  | (1,364) |
Personalized Oncology Solutions [Member] |  |  |  |  |  |  |  |
Net revenue | 623 |  | 459 |  | 1,245 |  | 1,377 |
Direct cost of services | (726) |  | (576) |  | (1,470) |  | (1,293) |
Sales and marketing costs | (423) |  | (378) |  | (754) |  | (814) |
Other operating expenses | 0 |  | 0 |  | 0 |  | 0 |
Stock- based compensation expense | 0 | [1] | 0 | [1] | 0 | [1] | 0 | [1]
Segment profit (loss) | (526) |  | (495) |  | (979) |  | (730) |
Translational Oncology Solutions [Member] |  |  |  |  |  |  |  |
Net revenue | 1,760 |  | 999 |  | 4,158 |  | 2,187 |
Direct cost of services | (696) |  | (471) |  | (1,566) |  | (1,162) |
Sales and marketing costs | (213) |  | (241) |  | (460) |  | (432) |
Other operating expenses | (673) |  | (433) |  | (1,063) |  | (794) |
Stock- based compensation expense |  |  | 0 | [1] | 0 | [1] | 0 | [1]
Segment profit (loss) | 178 |  | (146) |  | 1,069 |  | (201) |
Unallocated Corporate Overhead [Member] |  |  |  |  |  |  |  |
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 | (877) |  | (651) |  | (1,534) |  | (1,221) |
Stock- based compensation expense | (476) | [1] | (624) | [1] | (1,028) | [1] | (1,364) | [1]
Segment profit (loss) | (1,353) |  | (1,275) |  | (2,562) |  | (2,585) |
Consolidated [Member] |  |  |  |  |  |  |  |
Net revenue | 2,383 |  | 1,458 |  | 5,403 |  | 3,564 |
Direct cost of services | (1,422) |  | (1,047) |  | (3,036) |  | (2,455) |
Sales and marketing costs | (636) |  | (619) |  | (1,214) |  | (1,246) |
Other operating expenses | (1,550) |  | (1,084) |  | (2,597) |  | (2,015) |
Stock- based compensation expense | (476) | [1] | (624) | [1] | (1,028) | [1] | (1,364) | [1]
Segment profit (loss) | $ (1,701) |  | $ (1,916) |  | $ (2,472) |  | $ (3,516) |
[1] | Stock compensation expense is shown separately and is excluded from direct costs of services, sales and marketing costs, and other operating expenses, as it is managed on a consolidated basis and is not used by management to evaluate the performance of its segments.

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