Detail of Selected Balance Sheet Accounts - Activity in Allowance for Doubtful Accounts Receivable (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 301	$ 157
Bad debt expense	42	27
Uncollectible accounts written off, net of recoveries	(10)	(42)
Change due to foreign currency translation	13	(3)
Balance at end of period	$ 346	$ 139