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Selected Balance Sheet Data (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Sep. 30, 2017
Accounts receivable, net:    
Accounts receivable $ 51,241 $ 31,365
Less allowance for doubtful accounts 563 341
Less reserve for future returns and pricing adjustments 2,432 2,169
Accounts receivable, net 48,246 28,855
Inventories:    
Raw materials 25,734 24,050
Work in process 375 484
Finished goods 15,673 5,704
Inventories $ 41,782 $ 30,238