Detail of Selected Balance Sheet Accounts (Tables)

3 Months Ended

Dec. 31, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Activity in Allowance for Doubtful Accounts Receivable

Activity in our allowance for credit losses consisted of the following (in thousands):

	Three months ended December 31,
	2021		2020
Balance at beginning of period	$	333	$	510
Bad debt expense (recovery), net	91		(19)
Uncollectible accounts written off, net of recoveries	(14)		(10)
Change due to foreign currency translation	1		12
Balance at end of period	$	411	$	493

Components of Inventories

The components of inventories are summarized below (in thousands):

	December 31, 2021		September 30, 2021
Raw materials, parts and sub-assemblies, net	$	35,295	$	28,688
Work-in-progress	862		1,147
Total inventories	$	36,157	$	29,835

Activity in Product Warranty Accrual

Activity in our product warranty accrual consisted of the following (in thousands):

	Three months ended December 31,
	2021		2020
Balance at beginning of period	$	2,531	$	2,771
Increase to warranty expense	293		658
Deduction for warranty charges	(382)		(779)
Change due to foreign currency translation	1		25
Balance at end of period	$	2,443	$	2,675