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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
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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- Definition

Amount before allocation of valuation allowances of deferred tax liability attributable to deductible temporary differences from depreciation and amortization.

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