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Detail of Selected Balance Sheet Accounts (Tables)
 6 Months Ended
Mar. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Activity in Allowance for Doubtful Accounts Receivable
Activity in our allowance for doubtful accounts consisted of the following (in thousands):
 
Three months ended March 31,
 
Six months ended March 31,
 
2020
 
2019
 
2020
 
2019
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

 
—

Balance at end of period
$
300

 
$
214

 
$
300

 
$
214
Components of Inventories
The components of inventories are summarized below (in thousands):
 
March 31, 2020
 
September 30, 2019
Raw materials, parts and sub-assemblies, net
$
30,512

 
$
28,102

Work-in-progress
624

 
1,100

Total inventories
$
31,136

 
$
29,202
Activity in Product Warranty Accrual
Activity in our product warranty accrual consisted of the following (in thousands):
 
Three months ended March 31,
 
Six months ended March 31,
 
2020
 
2019
 
2020
 
2019
Balance at beginning of period
$
3,162

 
$
2,732

 
$
2,946

 
$
2,604

Increase in warranty expense
784

 
881

 
1,627

 
1,627

Deduction for warranty charges
(670
)
 
(634
)
 
(1,315
)
 
(1,238
)
Change due to foreign currency translation
—

 
7

 
18

 
(7
)
Balance at end of period
$
3,276

 
$
2,986

 
$
3,276

 
$
2,986