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Unaudited Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Income Statement [Abstract]        
Revenue $ 8,412 $ 5,992 $ 20,503 $ 18,717
Cost of goods sold 4,892 3,455 11,527 10,537
Gross profit 3,520 2,537 8,976 8,180
Operating expenses:        
Sales and marketing 1,736 1,907 4,932 6,121
Research and product development 1,501 1,428 4,319 4,322
General and administrative 1,443 1,300 4,475 4,330
Total operating expenses 4,680 4,635 13,726 14,773
Operating loss (1,160) (2,098) (4,750) (6,593)
Interest expense (108) (325)
Other income, net 19 142 70 235
Loss before income taxes (1,249) (1,956) (5,005) (6,358)
Provision for income taxes 11 20 39 65
Net loss $ (1,260) $ (1,976) $ (5,044) $ (6,423)
Basic weighted average shares outstanding (in shares) 17,000,215 16,646,323 16,768,088 16,635,954
Diluted weighted average shares outstanding (in shares) 17,000,215 16,646,323 16,768,088 16,635,954
Basic loss per share (in dollars per share) $ (0.07) $ (0.12) $ (0.30) $ (0.39)
Diluted loss per share (in dollars per share) $ (0.07) $ (0.12) $ (0.30) $ (0.39)
Comprehensive loss:        
Net loss $ (1,260) $ (1,976) $ (5,044) $ (6,423)
Unrealized gain/(loss) on available-for-sale securities, net of tax 4 (78) 11 76
Change in foreign currency translation adjustment 17 (50) (25) (67)
Comprehensive loss $ (1,239) $ (2,104) $ (5,058) $ (6,414)