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Quarterly financial data (unaudited) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Quarterly financial data (unaudited) | 21. Quarterly financial data (unaudited)
|  | 2018 |
(U.S. Dollars, in thousands, except per share data) |  | 1st Quarter |  |  | 2nd Quarter |  |  | 3rd Quarter |  |  | 4th Quarter |  |  | Year |
Net sales |  | $ | 108,709 |  |  | $ | 111,547 |  |  | $ | 111,708 |  |  | $ | 121,078 |  |  | $ | 453,042 |
Cost of sales |  |  | 24,147 |  |  |  | 22,835 |  |  |  | 24,020 |  |  |  | 25,626 |  |  |  | 96,628 |
Gross profit |  |  | 84,562 |  |  |  | 88,712 |  |  |  | 87,688 |  |  |  | 95,452 |  |  |  | 356,414 |
Operating expense1, 2 |  |  | 76,692 |  |  |  | 82,797 |  |  |  | 83,781 |  |  |  | 83,050 |  |  |  | 326,320 |
Operating income1, 2 |  |  | 7,870 |  |  |  | 5,915 |  |  |  | 3,907 |  |  |  | 12,402 |  |  |  | 30,094 |
Net income (loss) from continuing operations2 |  |  | 5,226 |  |  |  | 925 |  |  |  | (1,211 | ) |  |  | 8,871 |  |  |  | 13,811 |
Net income (loss) |  | $ | 5,226 |  |  | $ | 925 |  |  | $ | (1,211 | ) |  | $ | 8,871 |  |  | $ | 13,811 |
Net income (loss) per common share — basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) from continuing operations |  | $ | 0.28 |  |  | $ | 0.05 |  |  | $ | (0.07 | ) |  | $ | 0.47 |  |  | $ | 0.73 |
Net income (loss) |  | $ | 0.28 |  |  | $ | 0.05 |  |  | $ | (0.07 | ) |  | $ | 0.47 |  |  | $ | 0.73 |
Net income (loss) per common share — diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) from continuing operations |  | $ | 0.27 |  |  | $ | 0.05 |  |  | $ | (0.07 | ) |  | $ | 0.46 |  |  | $ | 0.72 |
Net income (loss) |  | $ | 0.27 |  |  | $ | 0.05 |  |  | $ | (0.07 | ) |  | $ | 0.46 |  |  | $ | 0.72 |
1 The Company reclassified $1.1 million of previously reported expense during the second quarter of 2018 related to changes in fair value of contingent consideration in the table above to conform to current period presentation. 2 The Company reclassified less than $10 thousand of previously reported net income (loss) from discontinued operations during the first, second, and third quarters of 2018 to continuing operations to conform to current period presentation.
|  | 2017 |
(U.S. Dollars, in thousands, except per share data) |  | 1st Quarter |  |  | 2nd Quarter |  |  | 3rd Quarter |  |  | 4th Quarter |  |  | Year |
Net sales |  | $ | 102,738 |  |  | $ | 108,942 |  |  | $ | 105,247 |  |  | $ | 116,896 |  |  | $ | 433,823 |
Cost of sales |  |  | 22,581 |  |  |  | 23,177 |  |  |  | 23,717 |  |  |  | 23,562 |  |  |  | 93,037 |
Gross profit |  |  | 80,157 |  |  |  | 85,765 |  |  |  | 81,530 |  |  |  | 93,334 |  |  |  | 340,786 |
Operating expense |  |  | 74,238 |  |  |  | 77,767 |  |  |  | 72,496 |  |  |  | 75,474 |  |  |  | 299,975 |
Operating income |  |  | 5,919 |  |  |  | 7,998 |  |  |  | 9,034 |  |  |  | 17,860 |  |  |  | 40,811 |
Net income (loss) from continuing operations |  |  | (2,308 | ) |  |  | 4,735 |  |  |  | 3,348 |  |  |  | 1,516 |  |  |  | 7,291 |
Net income (loss) |  | $ | (2,654 | ) |  | $ | 3,853 |  |  | $ | 3,456 |  |  | $ | 1,568 |  |  | $ | 6,223 |
Net income (loss) per common share — basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) from continuing operations |  | $ | (0.13 | ) |  | $ | 0.26 |  |  | $ | 0.18 |  |  | $ | 0.08 |  |  | $ | 0.40 |
Net income (loss) |  | $ | (0.15 | ) |  | $ | 0.21 |  |  | $ | 0.19 |  |  | $ | 0.09 |  |  | $ | 0.34 |
Net income (loss) per common share — diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) from continuing operations |  | $ | (0.13 | ) |  | $ | 0.26 |  |  | $ | 0.18 |  |  | $ | 0.08 |  |  | $ | 0.39 |
Net income (loss) |  | $ | (0.15 | ) |  | $ | 0.21 |  |  | $ | 0.19 |  |  | $ | 0.08 |  |  | $ | 0.34 |

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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