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Income taxes - Additional Information (Detail)
£ in Millions
12 Months Ended
Jun. 30, 2024
USD ($)
Jun. 30, 2024
GBP (£)
Jun. 30, 2023
USD ($)
Income Tax Disclosure [Line Items]      
Unrecognised tax benefits $ 0   $ 0
Deferred tax assets increase decrease in valuation allowance $ 9,800,000   $ 14,500,000
Net operating loss description In general, an ownership change, as defined by Section 382, results from transactions increasing the ownership of 5-percent shareholders in the stock of a corporation by more than 50 percentage points over a three-year period. In general, an ownership change, as defined by Section 382, results from transactions increasing the ownership of 5-percent shareholders in the stock of a corporation by more than 50 percentage points over a three-year period.  
Research and development expenses amortization period 5 years    
Threshold percentage set off of annual profits by operating loss carry forward 80.00% 80.00%  
United Kingdom      
Income Tax Disclosure [Line Items]      
Research and development expenses amortization period 15 years    
Threshold percentage set off of annual profits by operating loss carry forward 50.00% 50.00%  
Threshold operating loss carry forward can be set off | £   £ 5  
State and Local Jurisdiction [Member]      
Income Tax Disclosure [Line Items]      
Operating carry forwards description of the expiry period Certain state net operating loss carryforwards begin to expire in 2038. Certain state net operating loss carryforwards begin to expire in 2038. Certain state net operating loss carryforwards begin to expire in 2038.
Domestic And Foreign [Member]      
Income Tax Disclosure [Line Items]      
Operating carry forwards description of the expiry period The UK and federal net operating loss carryforwards have no expiration dates. The UK and federal net operating loss carryforwards have no expiration dates. The UK and federal net operating loss carryforwards have no expiration dates.