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Unaudited Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Income Statement [Abstract]        
Revenue $ 6,357 $ 6,420 $ 12,091 $ 12,725
Cost of goods sold 3,739 3,481 6,635 7,082
Gross profit 2,618 2,939 5,456 5,643
Operating expenses:        
Sales and marketing 1,457 2,261 3,196 4,214
Research and product development 1,474 1,307 2,818 2,894
General and administrative 1,526 1,475 3,032 3,030
Total operating expenses 4,457 5,043 9,046 10,138
Operating loss (1,839) (2,104) (3,590) (4,495)
Interest expense (109) (217)
Other income, net 16 51 51 93
Loss before income taxes (1,932) (2,053) (3,756) (4,402)
Provision for income taxes 5 45 28 45
Net loss $ (1,937) $ (2,098) $ (3,784) $ (4,447)
Basic weighted average shares outstanding (in shares) 16,650,774 16,630,770 16,650,750 16,630,684
Diluted weighted average shares outstanding (in shares) 16,650,774 16,630,770 16,650,750 16,630,684
Basic loss per share (in dollars per share) $ (0.12) $ (0.13) $ (0.23) $ (0.27)
Diluted loss per share (in dollars per share) $ (0.12) $ (0.13) $ (0.23) $ (0.27)
Comprehensive loss:        
Net loss $ (1,937) $ (2,098) $ (3,784) $ (4,447)
Unrealized gain on available-for-sale securities, net of tax 30 84 7 154
Change in foreign currency translation adjustment (8) 9 (42) (17)
Comprehensive loss $ (1,915) $ (2,005) $ (3,819) $ (4,310)