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Selected Balance Sheet Data (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Sep. 30, 2016
Accounts receivable, net:    
Accounts receivable $ 30,464 $ 30,885
Less allowance for doubtful accounts 204 209
Less reserve for future returns and pricing adjustments 2,255 1,991
Accounts receivable, net 28,005 28,685
Inventories:    
Raw materials 19,264 21,116
Work in process 741 802
Finished goods 4,333 4,358
Inventories $ 24,338 $ 26,276