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Unaudited Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Income Statement [Abstract]    
Revenue $ 5,734 $ 6,305
Cost of goods sold 2,896 3,601
Gross profit 2,838 2,704
Operating expenses:    
Sales and marketing 1,739 1,953
Research and product development 1,344 1,587
General and administrative 1,506 1,555
Total operating expenses 4,589 5,095
Operating loss (1,751) (2,391)
Interest expense (108)
Other income, net 35 42
Loss before income taxes (1,824) (2,349)
Provision for (benefit from) income taxes 23
Net loss $ (1,847) $ (2,349)
Basic weighted average shares outstanding (in shares) 16,650,725 16,630,597
Diluted weighted average shares outstanding (in shares) 16,650,725 16,630,597
Basic loss per share (in dollars per share) $ (0.11) $ (0.14)
Diluted loss per share (in dollars per share) $ (0.11) $ (0.14)
Comprehensive loss:    
Net loss $ (1,847) $ (2,349)
Unrealized gain (loss) on available-for-sale securities, net of tax (23) 70
Change in foreign currency translation adjustment (34) (27)
Comprehensive loss $ (1,904) $ (2,306)