Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Valuation allowance	$ 3,810	$ 4,372
Income tax provision for Tax Cuts & Jobs Act of 2017	$ 3,000
Tax Credit Carryforward [Line Items]
U.S. capital loss carryforward		2,900
United States Federal Tax Jurisdiction
Tax Credit Carryforward [Line Items]
Federal and state research and development tax credits		3,100
U.S. capital loss carryforward		2,600
Deferred Tax Assets, Other Tax Carryforwards		100
Foreign Tax Authority
Tax Credit Carryforward [Line Items]
Non-U.S. operating losses		$ 200