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Provision for Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Apr. 30, 2019 | Apr. 30, 2018
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Income Tax Disclosure [Abstract] |  |
Accrued liabilities | $ 385 | $ 71
Depreciation and amortization | (99) | (58)
State taxes | 0 | 1
Stock-based compensation expense | 4,207 | 4,466
Capitalized research and development costs | 0 | 43
Foreign net operating loss carry-forward | 0 | 208
Net operating loss carry-forward | 10,460 | 9,678
Total deferred tax assets | 14,953 | 14,409
Less: Valuation allowance | (14,953) | (14,409)
Net deferred tax asset | $ 0 | $ 0

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