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Condensed Consolidated Statements of Operations (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Mar. 31, 2013
Revenue:        
Hardware product revenue $ 40,560 $ 43,111 $ 82,549 $ 86,154
Service revenue 5,322 5,086 10,655 9,034
Total revenue 45,882 48,197 93,204 95,188
Cost of sales:        
Cost of hardware product 20,012 20,122 40,275 40,248
Cost of service 4,090 3,114 8,241 5,500
Total cost of sales 24,102 23,236 48,516 45,748
Gross profit 21,780 24,961 44,688 49,440
Operating expenses:        
Sales and marketing 10,399 10,414 20,618 20,688
Research and development 7,411 7,775 14,668 15,192
General and administrative 4,619 6,390 9,342 11,506
Restructuring (reversal) charges, net 0 (37) 81 (37)
Total operating expenses 22,429 24,542 44,709 47,349
Operating (loss) income (649) 419 (21) 2,091
Other income, net:        
Interest income 50 50 93 102
Interest expense (1) (37) (1) (37)
Other income, net 21 438 114 562
Total other income, net 70 451 206 627
(Loss) income before income taxes (579) 870 185 2,718
Income tax (benefit) provision (1,317) (130) (1,241) 488
Net income $ 738 $ 1,000 $ 1,426 $ 2,230
Net income per common share:        
Basic (USD per share) $ 0.03 $ 0.04 $ 0.06 $ 0.09
Diluted (USD per share) $ 0.03 $ 0.04 $ 0.05 $ 0.08
Weighted average common shares:        
Basic (shares) 25,644 26,138 25,680 26,163
Diluted (shares) 26,144 26,476 26,189 26,474