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Consolidated Statements of Income and Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenue $ 41,804 $ 48,637 $ 57,796
Cost of goods sold 17,795 19,150 21,077
Gross profit 24,009 29,487 36,719
Operating expenses:      
Sales and marketing 10,996 10,032 10,646
Research and product development 9,342 8,584 8,318
General and administrative 7,161 7,325 7,493
Impairment of an intangible asset 769
Impairment of goodwill 12,724
Legal settlement (790)
Total operating expenses 40,202 25,921 26,457
Operating income/(loss) (16,193) 3,566 10,262
Other income, net 300 312 289
Income/(loss) before income taxes (15,893) 3,878 10,551
Benefit from/(provision for) income taxes 1,721 (1,434) (3,775)
Net income/(loss) $ (14,172) $ 2,444 $ 6,776
Basic earnings/(loss) per common share (in dollars per share) $ (1.65) $ 0.27 $ 0.74
Diluted earnings/(loss) per common share (in dollars per share) $ (1.65) $ 0.26 $ 0.71
Basic weighted average shares outstanding (in shares) 8,576,588 9,021,980 9,127,385
Diluted weighted average shares outstanding (in shares) 8,576,588 9,306,034 9,594,659
Comprehensive income:      
Net income/(loss) $ (14,172) $ 2,444 $ 6,776
Other comprehensive income:      
Unrealized gain (loss) on available-for-sale securities, net of tax 36 (1) (81)
Change in foreign currency translation adjustment 104 (38) (77)
Comprehensive income/(loss) $ (14,032) $ 2,405 $ 6,618