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DETAIL OF SELECTED BALANCE SHEET ACCOUNTS
 6 Months Ended
Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
DETAIL OF SELECTED BALANCE SHEET ACCOUNTS
DETAIL OF SELECTED BALANCE SHEET ACCOUNTS
Allowance for Doubtful Accounts
Activity in our allowance for doubtful accounts receivable consisted of the following (in thousands):
 
Three months ended March 31,
 
Six months ended March 31,
 
2019
 
2018
 
2019
 
2018
Balance at beginning of period
$
139

 
$
158

 
$
157

 
$
179

Bad debt expense
74

 
112

 
101

 
92

Uncollectible accounts written off, net of recoveries
(2
)
 
(7
)
 
(44
)
 
(8
)
Change due to foreign currency translation
3

 
1

 
—

 
1

Balance at end of period
$
214

 
$
264

 
$
214

 
$
264


 
Inventories
The components of inventories are summarized below (in thousands):
 
March 31, 2019
 
September 30, 2018
Raw materials, parts and subassemblies, net
$
23,535

 
$
20,272

Work-in-progress
1,189

 
1,080

Total inventories
$
24,724

 
$
21,352



Accrued Product Warranty
Activity in our product warranty accrual consisted of the following (in thousands):
 
Three months ended March 31,
 
Six months ended March 31,
 
2019
 
2018
 
2019
 
2018
Balance at beginning of period
$
2,732

 
$
2,890

 
$
2,604

 
$
3,174

Increase (decrease) in warranty expense
881

 
(261
)
 
1,627

 
(66
)
Deduction for warranty charges
(634
)
 
(383
)
 
(1,238
)
 
(861
)
Change due to foreign currency translation
7

 
(5
)
 
(7
)
 
(6
)
Balance at end of period
$
2,986

 
$
2,241

 
$
2,986

 
$
2,241