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Selected Balance Sheet Data (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Sep. 30, 2020
Accounts receivable, net:    
Accounts receivable $ 50,529 $ 65,027
Less allowance for credit losses 2,907 3,778
Less reserve for future credit returns and pricing adjustments 3,514 2,022
Accounts receivable, net 44,108 59,227
Inventories:    
Raw materials 14,478 14,009
Finished goods 36,929 37,559
Inventories $ 51,407 $ 51,568