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Teva Agreement (Details Textual) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Jan. 31, 2015 | Jan. 31, 2014 | Jan. 31, 2015 | Jan. 31, 2014 | Apr. 30, 2014
Teva Agreement [Line Items] |  |  |  |  |
Deferred Revenue, Revenue Recognized | $ 94,000us-gaap_DeferredRevenueRevenueRecognized | $ 0us-gaap_DeferredRevenueRevenueRecognized | $ 574,000us-gaap_DeferredRevenueRevenueRecognized | $ 194,000us-gaap_DeferredRevenueRevenueRecognized | $ 194,000us-gaap_DeferredRevenueRevenueRecognized

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- Definition Amount of previously reported deferred or unearned revenue that was recognized as revenue during the period. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.4(a).Q1) -URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 13 -Section A + Details
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