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Provision for Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Apr. 30, 2016 | Apr. 30, 2015
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Accrued liabilities | $ 21 | $ 21
State taxes | 12 | 1
Stock-based compensation expense | 5,528 | 4,803
Capitalized research and development costs | 316 | 433
Foreign net operating loss carry-forward | 224 | 235
Net operating loss carry-forward | 12,970 | 9,719
Total deferred tax assets | 19,071 | 15,212
Less: Valuation allowance | (19,071) | (15,212)
Net deferred tax asset | $ 0 | $ 0

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