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Provision for Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Apr. 30, 2020 | Apr. 30, 2019
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Income Tax Disclosure [Abstract] |  |
Accrued liabilities | $ 303 | $ 385
Depreciation and amortization | (175) | (99)
Stock-based compensation expense | 4,109 | 4,207
Net operating loss carry-forward | 11,174 | 10,460
Total deferred tax assets | 15,411 | 14,953
Less: Valuation allowance | (15,411) | (14,953)
Net deferred tax asset | $ 0 | $ 0

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