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LEASES - Right-of-use lease assets and lease liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Sep. 30, 2020
--- | --- | ---
Right-of-use lease assets and lease liabilities |  |
Operating right-of-use assets, net | $ 8,695 | $ 4,001
Current portion of operating lease liabilities | 1,916 | 866
Long-term operating lease liabilities | 6,884 | 3,344
Total operating lease liabilities | 8,800 | 4,210
Finance right-of-use assets, net | 66 | 4,778
Current portion of finance lease liabilities | 29 | 4,728
Long-term finance lease liabilities | 39 | 44
Total finance lease liabilities | $ 68 | $ 4,772

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