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Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Income Statement [Abstract]        
Revenue $ 10,311 $ 11,966 $ 21,989 $ 24,999
Cost of goods sold 4,242 4,302 9,242 8,870
Gross profit 6,069 7,664 12,747 16,129
Operating expenses:        
Sales and marketing 2,646 2,681 5,387 5,306
Research and product development 2,322 2,096 4,679 4,365
General and administrative 2,210 1,567 4,316 3,165
Total operating expenses 7,178 6,344 14,382 12,836
Operating income (loss) (1,109) 1,320 (1,635) 3,293
Other income, net 84 84 186 94
Income (loss) before income taxes (1,025) 1,404 (1,449) 3,387
Provision for (benefit from) income taxes (205) 449 (161) 1,064
Net income (loss) $ (820) $ 955 $ (1,288) $ 2,323
Basic earnings (loss) per common share $ (0.09) $ 0.10 $ (0.15) $ 0.25
Diluted earnings (loss) per common share $ (0.09) $ 0.10 $ (0.15) $ 0.24
Basic weighted average shares outstanding 8,638,091 9,112,613 8,702,743 9,154,658
Diluted weighted average shares outstanding 8,638,091 9,362,037 8,702,743 9,512,559
Comprehensive income:        
Net income (loss) $ (820) $ 955 $ (1,288) $ 2,323
Other comprehensive income:        
Change in unrealized gains (losses) on available-for-sale securities, net of tax 20 97 58 218
Change in foreign currency translation adjustment 52 (20) 64 13
Comprehensive income (loss) $ (748) $ 1,032 $ (1,166) $ 2,554