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Provision for Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Apr. 30, 2022 | Apr. 30, 2021
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Income Tax Disclosure [Abstract] |  |
Accrued liabilities | $ 162 | $ 232
Right of use, net asset/liability | 316 | 271
Depreciation and amortization | (396) | (206)
Stock-based compensation expense | 3,874 | 3,640
Net operating loss carry-forward | 11,546 | 11,404
Total deferred tax assets | 15,502 | 15,341
Less: Valuation allowance | (15,502) | (15,341)
Net deferred tax asset | $ 0 | $ 0

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