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LEASES - Right-of-use lease assets and lease liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Sep. 30, 2020
Right-of-use lease assets and lease liabilities    
Operating right-of-use assets, net $ 4,105 $ 4,001
Current portion of operating lease liabilities 1,004 866
Long-term operating lease liabilities 3,278 3,344
Total operating lease liabilities 4,282 4,210
Finance right-of-use assets, net 4,710 4,778
Current portion of finance lease liabilities 4,664 4,728
Long-term finance lease liabilities 42 44
Total finance lease liabilities $ 4,706 $ 4,772