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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 300	$ 214	$ 301	$ 157
Bad debt expense	136	25	187	126
Uncollectible accounts written off, net of recoveries	(2)	(31)	(57)	(74)
Change due to foreign currency translation	0	(3)	3	(4)
Balance at end of period	$ 434	$ 205	$ 434	$ 205