Provision for Income Taxes - Summary of Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Apr. 30, 2023	Apr. 30, 2022
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