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Income taxes - Summary of reconciliation of effective rate of the company's provision (benefit) for income taxes (Detail)	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Income Tax Disclosure [Abstract]
Statutory rate	21.00%	21.00%
Permanent differences	(0.09%)	(0.76%)
Share-based payments	(0.53%)	(0.80%)
Change in valuation allowance	(11.82%)	7.12%
Foreign tax rate differential	0.02%	0.03%
Section 382 Write-off	0.00%	(26.59%)
Section 162m Write-off	(8.58%)	0.00%
Total	0.00%	0.00%

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Effective income tax reconciliation on tax losses upto permissible limit.

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Effective income tax reconciliation percentage permanent differences.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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