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Leases - Operating Lease Assets and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 30, 2020
Assets:    
Operating lease assets, net $ 3,453 $ 5,217
Liabilities:    
Current operating lease liabilities 1,415 2,352
Long-term operating lease liabilities 2,413 3,434
Total lease liabilities $ 3,828 $ 5,786