Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Apr. 30, 2026	Apr. 30, 2025
Deferred tax assets
Accrued payroll	$ 7,165	$ 7,483
Other accruals & reserves	2,909	3,423
Operating lease liability	13,625	13,696
Deferred revenue	3,368	1,354
Net operating losses	243,715	179,554
R&D tax credit	24,156	20,396
Stock based compensation	15,201	15,710
Capitalized R&D expenditure	105,857	93,759
Other	361	362
Gross deferred tax assets	416,357	335,737
Valuation allowance	(400,447)	(320,939)
Total deferred tax assets	15,910	14,798
Deferred tax liabilities
Prepaid expenses	(4,523)	(1,774)
Depreciation	(7,025)	(8,635)
Operating lease right-of-use assets	(4,362)	(4,389)
Total deferred tax liabilities	(15,910)	(14,798)
Net deferred tax assets (liabilities)	$ 0	$ 0

Deferred Tax Assets, Capitalized Research And Development Expenditure

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Deferred Tax Assets, Operating Lease Liability

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Amount of deferred tax liability attributable to taxable temporary differences.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible research tax credit carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from employee compensation.

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Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences from reserves and accruals, classified as other.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Amount of deferred tax liability attributable to taxable temporary differences from leasing arrangements.

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Amount of deferred tax consequences attributable to taxable temporary differences derived from prepaid expenses.

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Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment.

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