DETAIL OF SELECTED BALANCE SHEET ACCOUNTS - Activity in Allowance for Doubtful Accounts Receivable (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 214	$ 264	$ 157	$ 179
Bad debt expense	25	18	126	110
Uncollectible accounts written off, net of recoveries	(31)	(36)	(74)	(44)
Change due to foreign currency translation	(3)	(7)	(4)	(6)
Balance at end of period	$ 205	$ 239	$ 205	$ 239