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Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Statement [Abstract]        
Revenue $ 10,560 $ 12,908 $ 32,549 $ 37,907
Cost of goods sold 4,051 5,240 13,293 14,110
Gross profit 6,509 7,668 19,256 23,797
Operating expenses:        
Sales and marketing 3,006 2,389 8,393 7,695
Research and product development 2,268 2,116 6,947 6,481
General and administrative 1,281 1,739 5,597 4,904
Impairment of an intangible asset 736 736
Impairment of goodwill 12,724 12,724
Total operating expenses 20,015 6,244 34,397 19,080
Operating income (loss) (13,506) 1,424 (15,141) 4,717
Other income, net 78 100 264 194
Income (loss) before income taxes (13,428) 1,524 (14,877) 4,911
Provision for (benefit from) income taxes (4,152) 315 (4,313) 1,379
Net income (loss) $ (9,276) $ 1,209 $ (10,564) $ 3,532
Basic earnings (loss) per common share $ (1.09) $ 0.14 $ (1.22) $ 0.39
Diluted earnings (loss) per common share $ (1.09) $ 0.13 $ (1.22) $ 0.37
Basic weighted average shares outstanding 8,520,041 8,921,480 8,641,173 9,076,305
Diluted weighted average shares outstanding 8,520,041 9,164,165 8,641,173 9,452,616
Comprehensive income:        
Net income (loss) $ (9,276) $ 1,209 $ (10,564) $ 3,532
Other comprehensive income:        
Change in unrealized gains (losses) on available-for-sale securities, net of tax 10 (39) 68 179
Change in foreign currency translation adjustment 23 7 88 19
Comprehensive income (loss) $ (9,243) $ 1,177 $ (10,408) $ 3,730