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Organization and Basis of Presentation - Narrative (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Apr. 30, 2018 USD ($) subsidiary segment | Apr. 30, 2017 USD ($) | Apr. 30, 2016 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |
Number of operating subsidiaries | subsidiary | 2 |  |
Number of reportable segments | segment | 1 |  |
Net loss | $ 1,476 | $ 6,884 |
Accumulated deficit | 70,826 | 69,350 |
Negative working capital | 2,400 |  |
Cash and cash equivalents | $ 856 | $ 3,295 | $ 2,585

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