Leases - Summary of Operating Lease Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Sep. 30, 2021
Assets:
Operating lease assets, net	$ 3,526	$ 3,453
Liabilities:
Current operating lease liabilities	1,966	1,415
Long-term operating lease liabilities	1,866	2,413
Total lease liabilities	$ 3,832	$ 3,828