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Provision for Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Apr. 30, 2017 | Apr. 30, 2016
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Accrued liabilities | $ 103 | $ 21
State taxes | 22 | 12
Stock-based compensation expense | 6,503 | 5,528
Capitalized research and development costs | 195 | 316
Foreign net operating loss carry-forward | 214 | 224
Net operating loss carry-forward | 14,786 | 12,970
Total deferred tax assets | 21,823 | 19,071
Less: Valuation allowance | (21,779) | (19,071)
Net deferred tax asset | $ 44 | $ 0

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