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Unaudited Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenue $ 6,971 $ 10,311 $ 14,260 $ 21,989
Cost of goods sold 3,721 4,242 6,911 9,242
Gross profit 3,250 6,069 7,349 12,747
Operating expenses:        
Sales and marketing 2,760 2,646 5,628 5,387
Research and product development 1,920 2,322 3,976 4,679
General and administrative 1,542 2,210 3,159 4,316
Total operating expenses 6,222 7,178 12,763 14,382
Operating loss (2,972) (1,109) (5,414) (1,635)
Other income, net 49 84 73 186
Loss before income taxes (2,923) (1,025) (5,341) (1,449)
Benefit from income taxes (760) (205) (1,332) (161)
Net loss $ (2,163) $ (820) $ (4,009) $ (1,288)
Basic weighted average shares outstanding (in shares) 8,301,094 8,638,091 8,304,093 8,702,743
Diluted weighted average shares outstanding (in shares) 8,301,094 8,638,091 8,304,093 8,702,743
Basic loss per share (in dollars per share) $ (0.26) $ (0.09) $ (0.48) $ (0.15)
Diluted loss per share (in dollars per share) $ (0.26) $ (0.09) $ (0.48) $ (0.15)
Comprehensive loss:        
Net loss $ (2,163) $ (820) $ (4,009) $ (1,288)
Unrealized gain (loss) on available-for-sale securities, net of tax (1) 20 (71) 58
Change in foreign currency translation adjustment (60) 52 (38) 64
Comprehensive loss $ (2,224) $ (748) $ (4,118) $ (1,166)