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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, 2013
Mar. 31, 2012
Mar. 31, 2013
Mar. 31, 2012
Income Statement [Abstract]        
Net sales $ 48,197 $ 49,016 $ 95,188 $ 95,678
Cost of sales 23,236 23,233 45,748 45,465
Gross profit 24,961 25,783 49,440 50,213
Operating expenses:        
Sales and marketing 10,414 10,340 20,688 20,439
Research and development 7,775 7,753 15,192 15,985
General and administrative 6,390 4,201 11,506 9,248
Restructuring (37) 60 (37) 296
Total operating expenses 24,542 22,354 47,349 45,968
Operating income 419 3,429 2,091 4,245
Other income (expense), net:        
Interest income 50 74 102 146
Interest Expense (37) (15) (37) (15)
Other income, net 438 8 562 155
Total other income, net 451 67 627 286
Income before income taxes 870 3,496 2,718 4,531
Income tax (benefit) provision (130) 1,374 488 1,685
Net income $ 1,000 $ 2,122 $ 2,230 $ 2,846
Net income per common share:        
Basic $ 0.04 $ 0.08 $ 0.09 $ 0.11
Diluted $ 0.04 $ 0.08 $ 0.08 $ 0.11
Weighted average common shares:        
Basic 26,138 25,709 26,163 25,674
Diluted 26,476 26,205 26,474 26,172