Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Income tax expense (benefit), intraperiod tax allocation	$ (1,249)	$ (5)
Deferred tax assets, valuation allowance	6,377	$ 3,247
Unrecognized tax benefits	$ 0