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Selected Balance Sheet Data (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Sep. 30, 2020
Accounts receivable, net:    
Accounts receivable $ 57,782 $ 65,027
Less allowance for doubtful accounts 2,987 3,778
Less reserve for future returns and pricing adjustments 2,295 2,022
Accounts receivable, net 52,500 59,227
Inventories:    
Raw materials 14,695 14,009
Finished goods 40,062 37,559
Inventories $ 54,757 $ 51,568