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Income Tax Expense - Additional information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Income Tax Expense    
Net operating loss carryforward - foreign $ 3,855 $ 3,714
Deferred tax assets, operating loss carry forwards, not subject to expiration 11,700  
Deferred tax assets, operating loss carry forwards, subject to expiration 2,100  
Deferred tax assets, operating loss carry forwards, state and local 500  
Deferred tax assets, tax credit carry forwards, research 1,600  
State research and other credit carry forwards with expiration date 100  
State research and other credit carry forwards without expiration date 1,500  
Deferred tax assets, valuation allowance 1,513 1,772
Unrecognized tax benefits 0  
Foreign Valuation Allowance    
Income Tax Expense    
Operating loss carry forwards, valuation allowance 1,000 1,300
State and Local Jurisdiction    
Income Tax Expense    
Net operating loss carryforward - foreign 13,800  
Deferred tax assets, valuation allowance 1,500 1,800
Net change in valuation allowance (300) 600
Foreign Country    
Income Tax Expense    
Deferred tax assets, valuation allowance 500 $ 500
Net change in valuation allowance $ 300