Leases - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Lessee, Lease, Description [Line Items]
Total lease obligations	$ 4,585
Total lease obligations	1,075
Right-of-use obligations, current	1,275	$ 0
Impairment of right-of-use asset	660	0
Right-of-use assets	3,758	$ 0
Accounting Standards Update 2016-02
Lessee, Lease, Description [Line Items]
Total lease obligations	1,400
Right-of-use assets	$ 4,600
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