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LEASES - Right-of-use lease assets and lease liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Sep. 30, 2021
--- | --- | ---
Right-of-use lease assets and lease liabilities |  |
Operating right-of-use assets, net | $ 24,469 | $ 8,358
Current portion of operating lease liabilities | 5,674 | 1,959
Long-term operating lease liabilities | 18,705 | 6,554
Total operating lease liabilities | 24,379 | 8,513
Finance lease right-of-use assets, net | 54 | 60
Current portion of finance lease liabilities | 22 | 24
Long-term finance lease liabilities | 35 | 39
Total finance lease liabilities | $ 57 | $ 63

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