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Provision for Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Apr. 30, 2018 | Apr. 30, 2017
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Accrued liabilities | $ 71 | $ 103
Depreciation and amortization | (58) | 0
State taxes | 1 | 22
Stock-based compensation expense | 4,466 | 6,503
Capitalized research and development costs | 43 | 195
Foreign net operating loss carry-forward | 208 | 214
Net operating loss carry-forward | 9,678 | 14,786
Total deferred tax assets | 14,409 | 21,823
Less: Valuation allowance | (14,409) | (21,779)
Net deferred tax asset | $ 0 | $ 44

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