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Unaudited Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Income Statement [Abstract]    
Revenue $ 7,038 $ 5,734
Cost of goods sold 4,035 2,896
Gross profit 3,003 2,838
Operating expenses:    
Sales and marketing 1,573 1,739
Research and product development 1,274 1,344
General and administrative 1,680 1,506
Total operating expenses 4,527 4,589
Operating loss (1,524) (1,751)
Interest expense (112) (108)
Other income (expense), net (5) 35
Loss before income taxes (1,641) (1,824)
Provision for income taxes 14 23
Net loss $ (1,655) $ (1,847)
Basic weighted average shares outstanding (in shares) 18,775,773 16,650,725
Diluted weighted average shares outstanding (in shares) 18,775,773 16,650,725
Basic loss per share (in dollars per share) $ (0.09) $ (0.11)
Diluted loss per share (in dollars per share) $ (0.09) $ (0.11)
Comprehensive loss:    
Net loss $ (1,655) $ (1,847)
Unrealized loss on available-for-sale securities, net of tax (2) (23)
Change in foreign currency translation adjustment (12) (34)
Comprehensive loss $ (1,669) $ (1,904)