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Commitments and Contingencies - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2016 | Apr. 30, 2017 | Apr. 30, 2016
Commitments and Contingencies [Line Items] |  |  |
Operating leases, rent expense |  | $ 398 | $ 304
Corporate Headquarters |  |  |
Commitments and Contingencies [Line Items] |  |  |
Operating leases, rent expense | $ 85 | 86 |
Laboratories and Office Space |  |  |
Commitments and Contingencies [Line Items] |  |  |
Operating leases, rent expense |  | 105 | 83
New York Laboratory |  |  |
Commitments and Contingencies [Line Items] |  |  |
Operating leases, rent expense |  | $ 207 | $ 136

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- References No definition available. + Details
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- Definition Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References No definition available. + Details
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- Details
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- Details
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- Details
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