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Consolidated Statements of Income and Comprehensive Income - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Statement [Abstract] |  |  |
Net sales | $ 453,042 | $ 433,823 | $ 409,788
Cost of sales | 96,628 | 93,037 | 87,853
Gross profit | 356,414 | 340,786 | 321,935
Sales and marketing | 205,527 | 198,370 | 181,287
General and administrative | 84,506 | 71,905 | 76,409
Research and development | 33,218 | 29,700 | 28,803
Changes in fair value of contingent consideration | 3,069 |  |
Charges related to U.S. Government resolutions (Note 13) |  |  | 14,369
Operating income | 30,094 | 40,811 | 21,067
Interest income (expense), net | (828) | (416) | 763
Other expense, net | (6,381) | (4,004) | (2,806)
Income before income taxes | 22,885 | 36,391 | 19,024
Income tax expense | (9,074) | (29,100) | (15,527)
Net income from continuing operations | 13,811 | 7,291 | 3,497
Discontinued operations (Note 13) |  |  |
Loss from discontinued operations |  | (1,759) | (638)
Income tax benefit |  | 691 | 197
Net loss from discontinued operations |  | (1,068) | (441)
Net income | $ 13,811 | $ 6,223 | $ 3,056
Net income per common share—basic |  |  |
Net income from continuing operations | $ 0.73 | $ 0.40 | $ 0.19
Net loss from discontinued operations |  | (0.06) | (0.02)
Net income per common share—basic | 0.73 | 0.34 | 0.17
Net income per common share—diluted |  |  |
Net income from continuing operations | 0.72 | 0.39 | 0.19
Net loss from discontinued operations |  | (0.05) | (0.02)
Net income per common share—diluted | $ 0.72 | $ 0.34 | $ 0.17
Weighted average number of common shares: |  |  |
Basic | 18,494,002 | 18,117,405 | 18,144,019
Diluted | 18,911,610 | 18,498,745 | 18,463,161
Other comprehensive income (loss), before tax |  |  |
Unrealized gain (loss) on derivative instrument |  |  | $ (360)
Unrealized gain (loss) on debt security | $ 1,770 | $ 3,830 | (1,744)
Reclassification adjustment for loss on debt security in net income |  | 5,585 | 2,727
Currency translation adjustment | (1,823) | 4,552 | (726)
Other comprehensive income (loss) before tax | (53) | 13,967 | (103)
Income tax expense related to items of other comprehensive income (loss) | (438) | (3,600) | (245)
Other comprehensive income (loss), net of tax | (491) | 10,367 | (348)
Comprehensive income | $ 13,320 | $ 16,590 | $ 2,708

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