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Income Tax Expense - Additional information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Income Tax Expense    
Net operating loss carryforward - foreign $ 3,855 $ 3,855
Deferred tax assets, operating loss carry forwards, not subject to expiration 12,100  
Deferred tax assets, operating loss carry forwards, subject to expiration 1,800  
Deferred tax assets, operating loss carry forwards, state and local 500  
Deferred tax assets, tax credit carry forwards, research 1,000  
State research and other credit carry forwards with expiration date 100  
State research and other credit carry forwards without expiration date 900  
Deferred tax assets, valuation allowance 1,347 1,513
Unrecognized tax benefits 0  
State and Local Jurisdiction    
Income Tax Expense    
Net operating loss carryforward - foreign 13,900  
Deferred tax assets, valuation allowance 1,300 1,500
Net change in valuation allowance (200) 300
Foreign Country    
Income Tax Expense    
Deferred tax assets, valuation allowance 400 500
Net change in valuation allowance 100  
Foreign Valuation Allowance    
Income Tax Expense    
Operating loss carry forwards, valuation allowance $ 900 $ 1,000