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Selected Balance Sheet Data (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Sep. 30, 2019
Accounts receivable, net:    
Accounts receivable $ 83,748 $ 60,062
Less allowance for doubtful accounts 1,905 968
Less reserve for future returns and pricing adjustments 3,352 2,677
Accounts receivable, net 78,491 56,417
Inventories:    
Raw materials 13,210 12,308
Work in process 14 565
Finished goods 30,056 26,891
Inventories $ 43,280 $ 39,764