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Consolidated Statements of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Revenue      
Hardware product $ 172,846 $ 173,078 $ 180,434
Service 19,855 22,303 10,124
Total revenue 192,701 195,381 190,558
Cost of sales:      
Cost of hardware product 85,737 82,276 84,714
Cost of service 16,480 12,982 5,507
Total cost of sales 102,217 95,258 90,221
Gross profit 90,484 100,123 100,337
Operating expenses:      
Sales and marketing 40,576 40,513 39,242
Research and development 29,789 30,327 30,767
General and administrative 19,913 21,423 18,188
Restructuring charges, net 81 313 1,259
Total operating expenses 90,359 92,576 89,456
Operating income 125 7,547 10,881
Other income, net:      
Interest income 176 210 289
Interest expense (5) (42) (23)
Other income (expense), net 501 523 (250)
Total other income, net 672 691 16
Income before income taxes 797 8,238 10,897
Income tax (benefit) provision (954) 2,433 3,282
Net income $ 1,751 $ 5,805 $ 7,615
Net income per common share:      
Basic (USD per share) $ 0.07 $ 0.22 $ 0.30
Diluted (USD per share) $ 0.07 $ 0.22 $ 0.29
Weighted average common shares:      
Basic (shares) 25,345 25,956 25,743
Diluted (shares) 25,730 26,237 26,146