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Unaudited Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Income Statement [Abstract]        
Revenue $ 7,735 $ 6,357 $ 14,773 $ 12,091
Cost of goods sold 4,311 3,739 8,346 6,635
Gross profit 3,424 2,618 6,427 5,456
Operating expenses:        
Sales and marketing 1,755 1,457 3,328 3,196
Research and product development 1,487 1,474 2,761 2,818
General and administrative 1,668 1,526 3,348 3,032
Total operating expenses 4,910 4,457 9,437 9,046
Operating loss (1,486) (1,839) (3,010) (3,590)
Interest expense (107) (109) (219) (217)
Other income (expense), net 15 16 10 51
Loss before income taxes (1,578) (1,932) (3,219) (3,756)
Provision for income taxes 8 5 22 28
Net loss $ (1,586) $ (1,937) $ (3,241) $ (3,784)
Basic weighted average shares outstanding (in shares) 18,775,817 16,650,774 18,775,795 16,650,750
Diluted weighted average shares outstanding (in shares) 18,775,817 16,650,774 18,775,795 16,650,750
Basic loss per share (in dollars per share) $ (0.08) $ (0.12) $ (0.17) $ (0.23)
Diluted loss per share (in dollars per share) $ (0.08) $ (0.12) $ (0.17) $ (0.23)
Comprehensive loss:        
Net loss $ (1,586) $ (1,937) $ (3,241) $ (3,784)
Unrealized loss on available-for-sale securities, net of tax (3) 30 (5) 7
Change in foreign currency translation adjustment (10) (8) (22) (42)
Comprehensive loss $ (1,599) $ (1,915) $ (3,268) $ (3,819)