Leases - Summary of Operating Lease Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 30, 2020
Assets:
Operating lease assets, net	$ 4,711	$ 5,217
Liabilities:
Current operating lease liabilities	2,154	2,352
Long-term operating lease liabilities	3,075	3,434
Total lease liabilities	$ 5,229	$ 5,786