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Detail of Selected Balance Sheet Accounts
 9 Months Ended
Jun. 30, 2022
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,
 2022202120222021
Balance at beginning of period$703 $382 $333 $510 
Bad debt expense (recovery), net(170)326 274 194 
Uncollectible accounts written off, net of recoveries6 (168)(64)(178)
Change due to foreign currency translation(22)5 (26)19 
Balance at end of period$517 $545 $517 $545 
 
Inventories
The components of inventories are summarized below (in thousands):
June 30, 2022September 30, 2021
Raw materials, parts and sub-assemblies, net$47,458 $28,688 
Work-in-progress1,281 1,147 
Total inventories$48,739 $29,835 

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,
 2022202120222021
Balance at beginning of period$2,347 $2,467 $2,531 $2,771 
Increase to warranty expense462 515 1,077 1,568 
Deduction for warranty charges(499)(557)(1,303)(1,970)
Change due to foreign currency translation(22)7 (17)63 
Balance at end of period$2,288 $2,432 $2,288 $2,432