INCOME TAXES - Components of Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Current:
Federal	$ 0	$ 0
State	392	475
Foreign	0	0
Total	392	475
Deferred:
Federal	0	0
State	0	0
Foreign	637	0
Total	637	0
Total income tax provision	$ 1,029	$ 475	$ 0