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INCOME TAXES - INCOME TAXES COMPUTED USING FEDERAL INCOME TAX RATE (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Amount computed using statutory rate													$ 2,122	$ (1,078)	$ (666)
Net change in valuation allowance for net deferred tax assets													(367)	10,058	1,889
AMT and other													(191)	20	(148)
Foreign rate differential													22	(169)	(70)
Non-deductible items													(276)	(370)	(1,136)
State income tax													50	(34)	(15)
Foreign net operating loss													0	0	147
Impact of tax reform on deferred taxes													(4,901)	0	0
Research and development credits													475	2,494	0
Income tax benefit (provision)	$ (783)	$ 1,430	$ (99)	$ (3,614)	$ 11,012	$ (17)	$ (74)	$ 0	$ 96	$ 0	$ (79)	$ (16)	$ (3,066)	$ 10,921	$ 1

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