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Selected Balance Sheet Data (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Sep. 30, 2019
Accounts receivable, net:    
Accounts receivable $ 60,106 $ 60,062
Less allowance for doubtful accounts 2,178 968
Less reserve for future returns and pricing adjustments 4,052 2,677
Accounts receivable, net 53,876 56,417
Inventories:    
Raw materials 33,080 12,308
Work in process 0 565
Finished goods 13,470 26,891
Inventories $ 46,550 $ 39,764