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Unaudited Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income Statement [Abstract]        
Revenue $ 6,992 $ 8,412 $ 21,765 $ 20,503
Cost of goods sold 4,141 4,892 12,487 11,527
Gross profit 2,851 3,520 9,278 8,976
Operating expenses:        
Sales and marketing 1,692 1,736 5,020 4,932
Research and product development 1,492 1,501 4,253 4,319
General and administrative 1,676 1,443 5,024 4,475
Total operating expenses 4,860 4,680 14,297 13,726
Operating loss (2,009) (1,160) (5,019) (4,750)
Interest expense (150) (108) (369) (325)
Other income, net 7 19 17 70
Loss before income taxes (2,152) (1,249) (5,371) (5,005)
Provision for income taxes 17 11 39 39
Net loss $ (2,169) $ (1,260) $ (5,410) $ (5,044)
Basic weighted average shares outstanding (in shares) 19,449,283 17,000,215 19,002,758 16,768,088
Diluted weighted average shares outstanding (in shares) 19,449,283 17,000,215 19,002,758 16,768,088
Basic loss per share (in dollars per share) $ (0.11) $ (0.07) $ (0.28) $ (0.30)
Diluted loss per share (in dollars per share) $ (0.11) $ (0.07) $ (0.28) $ (0.30)
Comprehensive loss:        
Net loss $ (2,169) $ (1,260) $ (5,410) $ (5,044)
Unrealized gain (loss) on available-for-sale securities, net of tax (8) 4 (13) 11
Change in foreign currency translation adjustment (4) 17 (26) (25)
Comprehensive loss $ (2,181) $ (1,239) $ (5,449) $ (5,058)