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Detail of Selected Balance Sheet Accounts
 3 Months Ended
Dec. 31, 2020
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 consisted of the following (in thousands):
 Three months ended December 31,
 20202019
Balance at beginning of period$510 $301 
Bad debt expense (recovery)(19)42 
Uncollectible accounts written off, net of recoveries(10)(10)
Change due to foreign currency translation12 13 
Balance at end of period$493 $346 
 
Inventories
The components of inventories are summarized below (in thousands):
December 31, 2020September 30, 2020
Raw materials, parts and sub-assemblies, net$28,261 $27,429 
Work-in-progress758 1,539 
Total inventories$29,019 $28,968 

Accrued Product Warranty
Activity in our product warranty accrual consisted of the following (in thousands):
 Three months ended December 31,
 20202019
Balance at beginning of period$2,771 $2,946 
Increase to warranty expense658 843 
Deduction for warranty charges(779)(645)
Change due to foreign currency translation25 18 
Balance at end of period$2,675 $3,162