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, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 346	$ 139	$ 301	$ 157
Bad debt expense	9	74	51	101
Uncollectible accounts written off, net of recoveries	(45)	(2)	(55)	(44)
Change due to foreign currency translation	(10)	3	3	0
Balance at end of period	$ 300	$ 214	$ 300	$ 214