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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Income Statement [Abstract]        
Revenue $ 6,264 $ 6,992 $ 21,184 $ 21,765
Cost of goods sold 3,694 4,141 12,991 12,487
Gross profit 2,570 2,851 8,193 9,278
Operating expenses:        
Sales and marketing 1,151 1,692 4,273 5,020
Research and product development 876 1,492 3,406 4,253
General and administrative 1,673 1,676 5,146 5,024
Total operating expenses 3,700 4,860 12,825 14,297
Operating loss (1,130) (2,009) (4,632) (5,019)
Interest expense (90) (150) (285) (369)
Other income (loss), net (3) 7 1,505 17
Loss before income taxes (1,223) (2,152) (3,412) (5,371)
Provision for income taxes 25 17 60 39
Net loss $ (1,248) $ (2,169) $ (3,472) $ (5,410)
Basic weighted average shares outstanding (in shares) 23,952,555 19,449,283 23,933,033 19,002,758
Diluted weighted average shares outstanding (in shares) 23,952,555 19,449,283 23,933,033 19,002,758
Basic loss per share (in dollars per share) $ (0.05) $ (0.11) $ (0.15) $ (0.28)
Diluted loss per share (in dollars per share) $ (0.05) $ (0.11) $ (0.15) $ (0.28)
Comprehensive loss:        
Net loss $ (1,248) $ (2,169) $ (3,472) $ (5,410)
Unrealized loss on available-for-sale securities, net of tax 0 (8) (2) (13)
Change in foreign currency translation adjustment (22) (4) (45) (26)
Comprehensive loss $ (1,270) $ (2,181) $ (3,519) $ (5,449)