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Detail of Selected Balance Sheet Accounts (Tables)
 9 Months Ended
Jun. 30, 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 June 30,
 
Nine months ended June 30,
 
2020
 
2019
 
2020
 
2019
Balance at beginning of period
$
300

 
$
214

 
$
301

 
$
157

Bad debt expense
136

 
25

 
187

 
126

Uncollectible accounts written off, net of recoveries
(2
)
 
(31
)
 
(57
)
 
(74
)
Change due to foreign currency translation
—

 
(3
)
 
3

 
(4
)
Balance at end of period
$
434

 
$
205

 
$
434

 
$
205
Components of Inventories
The components of inventories are summarized below (in thousands):
 
June 30, 2020
 
September 30, 2019
Raw materials, parts and sub-assemblies, net
$
30,481

 
$
28,102

Work-in-progress
1,182

 
1,100

Total inventories
$
31,663

 
$
29,202
Activity in Product Warranty Accrual
Activity in our product warranty accrual consisted of the following (in thousands):
 
Three months ended June 30,
 
Nine months ended June 30,
 
2020
 
2019
 
2020
 
2019
Balance at beginning of period
$
3,276

 
$
2,986

 
$
2,946

 
$
2,604

Increase in warranty expense
276

 
945

 
1,904

 
2,572

Deduction for warranty charges
(555
)
 
(754
)
 
(1,826
)
 
(1,992
)
Change due to foreign currency translation
14

 
3

 
(13
)
 
(4
)
Balance at end of period
$
3,011

 
$
3,180

 
$
3,011

 
$
3,180