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Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2018	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Valuation allowance	$ 2,186		$ 4,372
Income tax provision for Tax Cuts & Jobs Act of 2017		$ 3,000
Tax Credit Carryforward [Line Items]
U.S. capital loss carryforward	$ 500
Latest Tax Year
Tax Credit Carryforward [Line Items]
Open Tax Year	2018
United States Federal Tax Jurisdiction
Tax Credit Carryforward [Line Items]
Federal and state research and development tax credits	$ 2,500
U.S. capital loss carryforward	200
Deferred Tax Assets, Other Tax Carryforwards	100
Foreign Tax Authority
Tax Credit Carryforward [Line Items]
Non-U.S. operating losses	$ 200