Segment Information and Major Customers (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2014 customer	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013 customer	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2014 segment customer	Sep. 30, 2013 customer	Sep. 30, 2012 customer
Segment Reporting Information [Line Items]
Number of operating segments									1
Number of reportable segments									1
Total revenue	$ 51,612	$ 47,885	$ 45,882	$ 47,322	$ 51,369	$ 48,824	$ 48,197	$ 46,991	$ 192,701	$ 195,381	$ 190,558
Total property, equipment and improvements	13,231				13,910				13,231	13,910	15,157
Number of customer representing over ten percent of revenue									0	0	0
Number of customer representing over ten percent of consolidated accounts receivable	0				1				0	1	0
Single customer representing over ten percent of consolidated accounts receivable, percent					13.80%					13.80%
North America, primarily United States
Segment Reporting Information [Line Items]
Total revenue									116,421	116,541	112,398
United States
Segment Reporting Information [Line Items]
Total property, equipment and improvements	12,813				13,321				12,813	13,321	14,233
United States | U.S. Export Net Sales
Segment Reporting Information [Line Items]
Percentage of revenue									41.20%	41.70%	39.60%
Europe, Middle East and Africa
Segment Reporting Information [Line Items]
Total revenue									47,729	48,815	47,042
Asia
Segment Reporting Information [Line Items]
Total revenue									22,762	24,507	24,844
Latin America
Segment Reporting Information [Line Items]
Total revenue									5,789	5,518	6,274
International, primarily Europe
Segment Reporting Information [Line Items]
Total property, equipment and improvements	418				589				418	589	924
Growth hardware product and all services
Segment Reporting Information [Line Items]
Total revenue									109,763	110,350	99,257
Mature hardware products
Segment Reporting Information [Line Items]
Total revenue									$ 82,938	$ 85,031	$ 91,301