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Selected Balance Sheet Data (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Sep. 30, 2020
Accounts receivable, net:    
Accounts receivable $ 48,596 $ 65,027
Less allowance for credit losses 3,681 3,778
Less reserve for future credit returns and pricing adjustments 3,639 2,022
Accounts receivable, net 41,276 59,227
Inventories:    
Raw materials 15,331 14,009
Finished goods 31,932 37,559
Inventories $ 47,263 $ 51,568