Income Taxes (Tables)

12 Months Ended

Apr. 30, 2022

Income Tax Disclosure [Abstract]

Schedule of Components of the Company's Loss Before Income Taxes

The components of the Company’s loss before income taxes for the years ended April 30 consisted of the following (in thousands):

	2022			2021			2020
Domestic	$	(21,145	)	$	(10,909	)	$	(6,337	)
Foreign		(61,194	)		(35,335	)		(22,903	)
	$	(82,339	)	$	(46,244	)	$	(29,240	)

Schedule of Reconciliation between Effective Tax Rates and Statutory Rates

A reconciliation between the effective tax rates and statutory rates for the years ended April 30 is as follows:

	2022			2021			2020
Income tax benefit at U.S. federal statutory    rate		21.0	%		21.0	%		21.0	%
Foreign rate differential		(1.5	)%		(1.6	)%		(1.6	)%
Nondeductible expenses - UK R&D credit		(10.6	)%		(8.3	)%		(12.1	)%
Other		(0.8	)%		0.4	%		(0.5	)%
Valuation allowance		(8.1	)%		(11.5	)%		(6.6	)%
		—			—			0.2	%

Schedule of Tax Effect of Significant Temporary Differences Representing Deferred Tax Assets and Liabilities

The tax effect of significant temporary differences representing deferred tax assets and liabilities as of April 30 is as follows (in thousands):

	2022			2021
Deferred tax assets:
Net operating loss (“NOL”) carryforwards	$	23,219		$	14,410
Operating lease liabilities		1,634			1,183
Other		4,936			2,615
Subtotal		29,789			18,208
Less: valuation allowance		(28,212	)		(17,030	)
Deferred tax assets, net of valuation allowance		1,577			1,178
Deferred tax liabilities:
Operating lease - Right-of-use assets		(1,570	)		(1,158	)
Other		(7	)		(20	)
Net deferred tax asset	$	—		$	—