Detail of Selected Balance Sheet Accounts - Activity in Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 493	$ 346	$ 510	$ 301
Bad debt expense (recovery), net	(113)	9	(132)	51
Uncollectible accounts written off, net of recoveries	0	(45)	(10)	(55)
Change due to foreign currency translation	2	(10)	14	3
Balance at end of period	$ 382	$ 300	$ 382	$ 300