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Share-Based Payments (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
Stock-based compensation expense | $ 941 | $ 570 | $ 1,968 | $ 1,934
General and Administrative Expense [Member] |  |  |  |
Stock-based compensation expense | 866 | 500 | 1,686 | 1,619
Selling and Marketing Expense [Member] |  |  |  |
Stock-based compensation expense | 63 | 56 | 189 | 199
Research and Development Expense [Member] |  |  |  |
Stock-based compensation expense | 4 | 4 | 19 | 33
Translational Oncology Solutions Cost of Sales [Member] |  |  |  |
Stock-based compensation expense | 2 | 4 | 12 | 16
Personalized Oncology Solutions Cost of Sales [Member] |  |  |  |
Stock-based compensation expense | $ 6 | $ 6 | $ 62 | $ 67

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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