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Detail of Selected Balance Sheet Accounts
 9 Months Ended
Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Detail of Selected Balance Sheet Accounts Detail of Selected Balance Sheet Accounts
Allowance for Credit Losses
Activity in our allowance for credit losses consisted of the following (in thousands):
 Three months ended June 30,Nine months ended June 30,
 2021202020212020
Balance at beginning of period$382 $300 $510 $301 
Bad debt expense, net326 136 194 187 
Uncollectible accounts written off, net of recoveries(168)(2)(178)(57)
Change due to foreign currency translation5 — 19 3 
Balance at end of period$545 $434 $545 $434 
 
Inventories
The components of inventories are summarized below (in thousands):
June 30, 2021September 30, 2020
Raw materials, parts and sub-assemblies, net$27,325 $27,429 
Work-in-progress1,072 1,539 
Total inventories$28,397 $28,968 

Accrued Product Warranty
Activity in our product warranty accrual consisted of the following (in thousands):
 Three months ended June 30,Nine months ended June 30,
 2021202020212020
Balance at beginning of period$2,467 $3,276 $2,771 $2,946 
Increase to warranty expense515 276 1,568 1,904 
Deduction for warranty charges(557)(555)(1,970)(1,826)
Change due to foreign currency translation7 14 63 (13)
Balance at end of period$2,432 $3,011 $2,432 $3,011