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Selected Balance Sheet Data (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Sep. 30, 2016
Accounts receivable, net:
Accounts receivable	$ 31,195	$ 30,885
Less allowance for doubtful accounts	257	209
Less reserve for future returns and pricing adjustments	2,218	1,991
Accounts receivable, net	28,720	28,685
Inventories:
Raw materials	23,922	21,116
Work in process	591	802
Finished goods	6,006	4,358
Inventories	$ 30,519	$ 26,276

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