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Teva Agreement (Details Textual) | 1 Months Ended | 9 Months Ended | 12 Months Ended | 1 Months Ended
--- | --- | --- | --- | ---
Nov. 30, 2012 USD ($) | Mar. 16, 2011 USD ($) | Jan. 31, 2014 USD ($) | Jan. 31, 2013 USD ($) | Apr. 30, 2013 CAD | Mar. 16, 2011 One Compound [Member] USD ($) | Mar. 16, 2011 Second Compound [Member] USD ($)
Potential Milestone Payments |  | $ 27,000,000 |  |  |  |  |
Royalty Expense |  |  |  |  | 10,000 | 460,000 | 880,000
Exercise of Options to One Time Royalty Fee | 880,000 |  | 880,000 |  |  |  |
Deferred Revenue, Revenue Recognized |  |  | 133,000 | 317,000 |  |  |
Increase (Decrease) in Contract Receivables, Net |  |  | $ 277,000 |  |  |  |

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