Leases - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Lessee, Lease, Description [Line Items]
Right-of-use lease assets	$ 2,730	$ 3,758
Operating lease, liability	3,339	4,585
Finance lease, right-of-use asset	2,136	1,070
Finance lease, liability	2,011	1,076
Impairment of right-of-use asset	0	$ 660
Accounting Standards Update 2016-02
Lessee, Lease, Description [Line Items]
Right-of-use lease assets	4,600
Operating lease, liability	4,600
Finance lease, right-of-use asset	1,400
Finance lease, liability	$ 1,400
Minimum
Lessee, Lease, Description [Line Items]
Lessee, operating lease, remaining lease term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Lessee, operating lease, remaining lease term	5 years