INCOME TAXES - Schedule of Calculation of the Effective Tax Rate (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2019	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income (loss) before income taxes	$ 1,363		$ (5,090)		$ (1,571)	$ (11,823)
Income tax expense (benefit)	405		(1,760)		166	(2,831)
Net income (loss)	$ 958	$ (2,695)	$ (3,330)	$ (5,662)	$ (1,737)	$ (8,992)
Effective tax rate	30.00%		35.00%		(11.00%)	24.00%