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DETAIL OF SELECTED BALANCE SHEET ACCOUNTS (Tables)
 3 Months Ended
Dec. 31, 2018
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 December 31,
 
2018
 
2017
Balance at beginning of period
$
157

 
$
179

Bad debt expense (recovery)
27

 
(20
)
Uncollectible accounts written off, net of recoveries
(42
)
 
(1
)
Change due to foreign currency translation
(3
)
 
—

Balance at end of period
$
139

 
$
158
Components of Inventories
The components of inventories are summarized below (in thousands):
 
December 31, 2018
 
September 30, 2018
Raw materials, parts and subassemblies, net
$
24,056

 
$
20,272

Work-in-progress
990

 
1,080

Total inventories
$
25,046

 
$
21,352
Activity in Product Warranty Accrual
Activity in our product warranty accrual consisted of the following (in thousands):
 
Three months ended December 31,
 
2018
 
2017
Balance at beginning of period
$
2,604

 
$
3,174

Increase in warranty expense
746

 
195

Deduction for warranty charges
(604
)
 
(478
)
Change due to foreign currency translation
(14
)
 
(1
)
Balance at end of period
$
2,732

 
$
2,890