LEASES - Right-of-use lease assets and lease liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Right-of-use lease assets and lease liabilities
Operating lease right-of use-assets, net	$ 4,001	$ 0
Current portion of operating lease liabilities	866	0
Long-term operating lease liabilities	3,344	0
Total operating lease liabilities	4,210
Finance lease right-to use assets, net	4,778	0
Current portion of finance lease liabilities	4,728	0
Long-term finance lease liabilities	44	$ 0
Total finance lease liabilities	$ 4,772