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Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Income Statement [Abstract]        
Revenue $ 12,908 $ 15,913 $ 37,907 $ 43,513
Cost of goods sold 5,240 5,725 14,110 15,873
Gross profit 7,668 10,188 23,797 27,640
Operating expenses:        
Sales and marketing 2,389 2,752 7,695 8,126
Research and product development 2,116 2,132 6,481 6,128
General and administrative 1,739 1,796 4,904 5,686
Total operating expenses 6,244 6,680 19,080 19,940
Operating income 1,424 3,508 4,717 7,700
Other income, net 100 54 194 244
Income before income taxes 1,524 3,562 4,911 7,944
Provision for income taxes 315 1,145 1,379 2,740
Net income $ 1,209 $ 2,417 $ 3,532 $ 5,204
Basic earnings per common share $ 0.14 $ 0.26 $ 0.39 $ 0.57
Diluted earnings per common share $ 0.13 $ 0.25 $ 0.37 $ 0.54
Basic weighted average shares outstanding 8,921,480 9,139,329 9,076,305 9,119,925
Diluted weighted average shares outstanding 9,164,165 9,615,684 9,452,616 9,583,951
Comprehensive income:        
Net income $ 1,209 $ 2,417 $ 3,532 $ 5,204
Other comprehensive income:        
Change in unrealized gains (losses) on available-for-sale securities, net of tax (39) 17 179 (5)
Change in foreign currency translation adjustment 7 (8) 19 (59)
Comprehensive income $ 1,177 $ 2,426 $ 3,730 $ 5,140