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Consolidated Statements of Operations (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Income Statement [Abstract]    
Revenue $ 49,592 $ 46,417
Cost of goods sold 19,735 19,089
Gross profit 29,857 27,328
Operating expenses:    
Sales and marketing 8,896 8,112
Research and product development 7,562 8,261
General and administrative 6,416 6,934
Proceeds from litigation, net (639) (38,500)
Total operating expenses 22,235 (15,193)
Operating income 7,622 42,521
Other income, net 147 34
Income before income taxes 7,769 42,555
Provision for income taxes (2,590) (15,908)
Net income 5,179 26,647
Basic earnings per common share $ 0.57 $ 2.93
Diluted earnings per common share $ 0.55 $ 2.89
Basic weighted average shares outstanding 9,064,340 9,107,234
Diluted weighted average shares outstanding 9,455,518 9,214,685
Unrealized gain on available-for-sale securities, net of tax of $13 23 0
Comprehensive income $ 5,202 $ 26,647