INCOME TAXES - Components of Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Current:
Federal	$ 0	$ 0	$ 0
State	(355)	(392)	(475)
Foreign	0	0	0
Total	(355)	(392)	(475)
Non-current:
Federal	0	0	0
State	0	0	0
Foreign	7,049	(637)	0
Total	7,049	(637)	0
Total income tax provision	$ 6,694	$ (1,029)	$ (475)

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