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Condensed Consolidated Statements of Income and Comprehensive Income - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Income Statement [Abstract] |  |  |  |
Net sales | $ 111,547 | $ 108,942 | $ 220,256 | $ 211,680
Cost of sales | 22,835 | 23,177 | 46,982 | 45,758
Gross profit | 88,712 | 85,765 | 173,274 | 165,922
Sales and marketing | 51,529 | 50,471 | 101,797 | 99,003
General and administrative | 22,268 | 20,409 | 41,752 | 38,691
Research and development | 7,891 | 6,887 | 14,828 | 14,311
Operating income | 7,024 | 7,998 | 14,897 | 13,917
Interest income (expense), net | (251) | 76 | (434) | 121
Other income (expense), net | (4,752) | 585 | (1,840) | (3,763)
Income before income taxes | 2,021 | 8,659 | 12,623 | 10,275
Income tax expense | (1,088) | (3,924) | (6,461) | (7,848)
Net income from continuing operations | 933 | 4,735 | 6,162 | 2,427
Discontinued operations (Note 6) |  |  |  |
Loss from discontinued operations |  | (1,300) | (3) | (1,827)
Income tax benefit (expense) | (8) | 418 | (8) | 599
Net loss from discontinued operations | (8) | (882) | (11) | (1,228)
Net income | $ 925 | $ 3,853 | $ 6,151 | $ 1,199
Net income (loss) per common share—basic |  |  |  |
Net income from continuing operations | $ 0.05 | $ 0.26 | $ 0.33 | $ 0.13
Net loss from discontinued operations |  | (0.05) |  | (0.06)
Net income per common share—basic | 0.05 | 0.21 | 0.33 | 0.07
Net income (loss) per common share—diluted |  |  |  |
Net income from continuing operations | 0.05 | 0.26 | 0.32 | 0.13
Net loss from discontinued operations |  | (0.05) |  | (0.06)
Net income per common share—diluted | $ 0.05 | $ 0.21 | $ 0.32 | $ 0.07
Weighted average number of common shares: |  |  |  |
Basic | 18,413,756 | 18,050,551 | 18,409,331 | 18,015,308
Diluted | 18,835,560 | 18,343,038 | 18,811,356 | 18,288,050
Other comprehensive income, before tax |  |  |  |
Unrealized gain (loss) on debt securities | $ 1,960 |  | $ 1,960 | $ (3,220)
Reclassification adjustment for loss on debt securities in net income |  |  |  | 5,585
Currency translation adjustment | (1,175) | $ 2,648 | (478) | 2,882
Other comprehensive income before tax | 785 | 2,648 | 1,482 | 5,247
Income tax related to items of other comprehensive income | (432) |  | (432) | (900)
Other comprehensive income, net of tax | 353 | 2,648 | 1,050 | 4,347
Comprehensive income | $ 1,278 | $ 6,501 | $ 7,201 | $ 5,546

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