Selected Balance Sheet Data (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Accounts receivable, net:
Accounts receivable	$ 30,885	$ 29,890
Less allowance for doubtful accounts	209	285
Less reserve for future returns and pricing adjustments	1,991	1,817
Total accounts receivable, net	28,685	27,788
Inventories:
Raw materials	21,116	26,037
Work in process	802	598
Finished goods	4,358	5,242
Total Inventories	26,276	31,877
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	37,519	37,519
Less accumulated depreciation and amortization	23,478	23,180
Total property, equipment and improvements, net	14,041	14,339	$ 13,109
Land
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	1,800	1,800
Buildings
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	10,522	10,522
Improvements
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	3,239	3,328
Equipment
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	15,778	15,691
Purchased Software
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	3,377	3,458
Furniture and Fixtures
Property, Plant and Equipment, Net
Total property, equipment and improvements, gross	$ 2,803	$ 2,720