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Business Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2014 | Jan. 31, 2013 | Jan. 31, 2014 | Jan. 31, 2013
Net revenue | $ 3,690 |  | $ 2,917 |  | $ 9,092 |  | $ 6,481 |
Sales and marketing costs | (821) |  | (658) |  | (2,160) |  | (2,047) |
Stock- based compensation expense | (941) |  | (570) |  | (1,968) |  | (1,934) |
Personalized Oncology Solutions [Member] |  |  |  |  |  |  |  |
Net revenue | 590 |  | 473 |  | 1,834 |  | 1,850 |
Direct cost of services | (608) |  | (661) |  | (2,078) |  | (2,030) |
Sales and marketing costs | (405) |  | (361) |  | (1,159) |  | (495) |
Other operating expenses | 0 |  | 0 |  | 0 |  | 0 |
Stock- based compensation expense | 0 | [1] | 0 | [1] | 0 | [1] | 0 | [1]
Segment profit (loss) | (423) |  | (549) |  | (1,403) |  | (675) |
Translational Oncology Solutions [Member] |  |  |  |  |  |  |  |
Net revenue | 3,100 |  | 2,444 |  | 7,258 |  | 4,631 |
Direct cost of services | (1,007) |  | (561) |  | (2,572) |  | (1,740) |
Sales and marketing costs | (352) |  | (220) |  | (812) |  | (636) |
Other operating expenses | (531) |  | (627) |  | (1,595) |  | (1,463) |
Stock- based compensation expense | 0 | [1] | 0 | [1] | 0 | [1] | 0 | [1]
Segment profit (loss) | 1,210 |  | 1,036 |  | 2,279 |  | 792 |
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 | (1,254) |  | (637) |  | (2,790) |  | (2,418) |
Stock- based compensation expense | (941) | [1] | (570) | [1] | (1,968) | [1] | (1,934) | [1]
Segment profit (loss) | (2,195) |  | (1,207) |  | (4,758) |  | (4,352) |
Consolidated [Member] |  |  |  |  |  |  |  |
Net revenue | 3,690 |  | 2,917 |  | 9,092 |  | 6,481 |
Direct cost of services | (1,615) |  | (1,222) |  | (4,650) |  | (3,770) |
Sales and marketing costs | (757) |  | (581) |  | (1,971) |  | (1,131) |
Other operating expenses | (1,785) |  | (1,264) |  | (4,385) |  | (3,881) |
Stock- based compensation expense | (941) | [1] | (570) | [1] | (1,968) | [1] | (1,934) | [1]
Segment profit (loss) | $ (1,408) |  | $ (720) |  | $ (3,882) |  | $ (4,235) |
[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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