DETAIL OF SELECTED BALANCE SHEET ACCOUNTS - Activity in Allowance for Doubtful Accounts Receivable (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of period	$ 139	$ 158	$ 157	$ 179
Bad debt expense	74	112	101	92
Uncollectible accounts written off, net of recoveries	(2)	(7)	(44)	(8)
Change due to foreign currency translation	3	1	0	1
Balance at end of period	$ 214	$ 264	$ 214	$ 264