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Unaudited Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Revenue $ 7,289 $ 11,678
Cost of goods sold 3,190 5,000
Gross profit 4,099 6,678
Operating expenses:    
Sales and marketing 2,868 2,741
Research and product development 2,056 2,357
General and administrative 1,617 2,106
Total operating expenses 6,541 7,204
Operating loss (2,442) (526)
Other income, net 24 102
Loss before income taxes (2,418) (424)
Provision for (benefit from) income taxes (572) 44
Net loss $ (1,846) $ (468)
Basic weighted average shares outstanding (in shares) 8,307,125 8,768,112
Diluted weighted average shares outstanding (in shares) 8,307,125 8,768,112
Basic loss per share (in dollars per share) $ (0.22) $ (0.05)
Diluted loss per share (in dollars per share) $ (0.22) $ (0.05)
Comprehensive loss:    
Net loss $ (1,846) $ (468)
Unrealized gain (loss) on available-for-sale securities, net of tax (70) 38
Change in foreign currency translation adjustment 22 12
Comprehensive loss $ (1,894) $ (418)