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Unaudited Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Revenue $ 5,992 $ 6,683 $ 18,717 $ 20,943
Cost of goods sold 3,455 3,703 10,537 10,614
Gross profit 2,537 2,980 8,180 10,329
Operating expenses:        
Sales and marketing 1,907 2,168 6,121 7,796
Research and product development 1,428 1,781 4,322 5,757
General and administrative 1,300 1,341 4,330 4,500
Total operating expenses 4,635 5,290 14,773 18,053
Operating loss (2,098) (2,310) (6,593) (7,724)
Other income, net 142 5 235 78
Loss before income taxes (1,956) (2,305) (6,358) (7,646)
Provision for (benefit from) income taxes 20 7,837 65 6,505
Net loss $ (1,976) $ (10,142) $ (6,423) $ (14,151)
Basic weighted average shares outstanding (in shares) 16,646,323 8,306,707 16,635,954 8,304,974
Diluted weighted average shares outstanding (in shares) 16,646,323 8,306,707 16,635,954 8,304,974
Basic loss per share (in dollars per share) $ (0.12) $ (1.22) $ (0.39) $ (1.70)
Diluted loss per share (in dollars per share) $ (0.12) $ (1.22) $ (0.39) $ (1.70)
Comprehensive loss:        
Net loss $ (1,976) $ (10,142) $ (6,423) $ (14,151)
Unrealized gain (loss) on available-for-sale securities, net of tax (78) (22) 76 (93)
Change in foreign currency translation adjustment (50) (13) (67) (51)
Comprehensive loss $ (2,104) $ (10,177) $ (6,414) $ (14,295)