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Provision for Income Taxes - Summary of Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Apr. 30, 2023 | Apr. 30, 2022
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Income Tax Disclosure [Abstract] |  |
Accrued liabilities | $ 273 | $ 162
Right of use, net asset/liability | 403 | 316
Depreciation and amortization | (297) | (396)
Stock-based compensation expense | 4,024 | 3,874
Capitalized research and development costs | 2,597 | 0
Net operating loss carry-forward | 9,756 | 11,546
Total deferred tax assets | 16,756 | 15,502
Less: Valuation allowance | (16,756) | (15,502)
Net deferred tax asset | $ 0 | $ 0

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