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Income Taxes - Additional Information (Details) - USD ($)
12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Operating Loss Carryforwards [Line Items]      
Increase (decrease) in valuation allowance $ 122,000,000    
Unrecognized tax benefits that would impact effective tax rate 0    
Increase in unrecognized tax benefits 0    
Decrease in unrecognized tax benefits 0    
Accrued interest and penalties related to unrecognized tax benefits 0 $ 0 $ 0
Domestic Tax Authority      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards 3,393,300,000    
NOL carryforwards subject to annual utilization limitation 42,000,000    
Domestic Tax Authority | Research Tax Credit Carryforward      
Operating Loss Carryforwards [Line Items]      
Tax credit carryforwards 87,800,000    
Foreign Tax Authority | Canada      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards 77,400,000    
Foreign Tax Authority | U.K.      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards 9,600,000    
State and Local Jurisdiction      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards 4,706,700,000    
Tax credit carryforwards 2,600,000    
NOL carryforwards subject to annual utilization limitation 36,400,000    
State and Local Jurisdiction | Research Tax Credit Carryforward      
Operating Loss Carryforwards [Line Items]      
Tax credit carryforwards $ 41,900,000