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DETAIL OF SELECTED BALANCE SHEET ACCOUNTS (Tables)
 9 Months Ended
Jun. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Activity in Allowance for Doubtful Accounts Receivable
Activity in our allowance for doubtful accounts receivable consisted of the following (in thousands):
 
Three months ended June 30,
 
Nine months ended June 30,
 
2019
 
2018
 
2019
 
2018
Balance at beginning of period
$
214

 
$
264

 
$
157

 
$
179

Bad debt expense
25

 
18

 
126

 
110

Uncollectible accounts written off, net of recoveries
(31
)
 
(36
)
 
(74
)
 
(44
)
Change due to foreign currency translation
(3
)
 
(7
)
 
(4
)
 
(6
)
Balance at end of period
$
205

 
$
239

 
$
205

 
$
239
Components of Inventories
The components of inventories are summarized below (in thousands):
 
June 30, 2019
 
September 30, 2018
Raw materials, parts and subassemblies, net
$
28,436

 
$
20,272

Work-in-progress
1,048

 
1,080

Total inventories
$
29,484

 
$
21,352
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,
 
2019
 
2018
 
2019
 
2018
Balance at beginning of period
$
2,986

 
$
2,241

 
$
2,604

 
$
3,174

Increase (decrease) in warranty expense
945

 
1,036

 
2,572

 
970

Deduction for warranty charges
(754
)
 
(891
)
 
(1,992
)
 
(1,752
)
Change due to foreign currency translation
3

 
(23
)
 
(4
)
 
(29
)
Balance at end of period
$
3,180

 
$
2,363

 
$
3,180

 
$
2,363