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Quarterly financial data (unaudited) | 12 Months Ended
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Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |
Quarterly financial data (unaudited) | 20. Quarterly financial data (unaudited)
|  | 2016 |
(U.S. Dollars, in thousands, except per share data) |  | 1st Quarter |  |  | 2nd Quarter |  |  | 3rd Quarter |  |  | 4th Quarter |  |  | Year |
Net sales |  | $ | 98,679 |  |  | $ | 104,075 |  |  | $ | 98,497 |  |  | $ | 108,537 |  |  | $ | 409,788 |
Cost of sales |  |  | 22,137 |  |  |  | 22,516 |  |  |  | 19,880 |  |  |  | 23,320 |  |  |  | 87,853 |
Gross profit |  |  | 76,542 |  |  |  | 81,559 |  |  |  | 78,617 |  |  |  | 85,217 |  |  |  | 321,935 |
Operating expense |  |  | 69,467 |  |  |  | 84,254 |  |  |  | 69,346 |  |  |  | 77,801 |  |  |  | 300,868 |
Operating income (loss) |  |  | 7,075 |  |  |  | (2,695 | ) |  |  | 9,271 |  |  |  | 7,416 |  |  |  | 21,067 |
Net income (loss) from continuing operations |  |  | 4,576 |  |  |  | (6,346 | ) |  |  | 10,384 |  |  |  | (5,117 | ) |  |  | 3,497 |
Net income (loss) |  | $ | 3,840 |  |  | $ | (7,444 | ) |  | $ | 9,896 |  |  | $ | (3,236 | ) |  | $ | 3,056 |
Net income (loss) per common share — basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) from continuing operations |  | $ | 0.25 |  |  | $ | (0.35 | ) |  | $ | 0.57 |  |  | $ | (0.29 | ) |  | $ | 0.19 |
Net income (loss) |  | $ | 0.21 |  |  | $ | (0.41 | ) |  | $ | 0.55 |  |  | $ | (0.18 | ) |  | $ | 0.17 |
Net income (loss) per common share — diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) from continuing operations |  | $ | 0.24 |  |  | $ | (0.35 | ) |  | $ | 0.56 |  |  | $ | (0.29 | ) |  | $ | 0.19 |
Net income (loss) |  | $ | 0.20 |  |  | $ | (0.41 | ) |  | $ | 0.54 |  |  | $ | (0.18 | ) |  | $ | 0.17 |
|  | 2015 |
(U.S. Dollars, in thousands, except per share data) |  | 1st Quarter |  |  | 2nd Quarter |  |  | 3rd Quarter |  |  | 4th Quarter |  |  | Year |
Net sales |  | $ | 89,762 |  |  | $ | 100,954 |  |  | $ | 101,151 |  |  | $ | 104,622 |  |  | $ | 396,489 |
Cost of sales |  |  | 19,339 |  |  |  | 21,910 |  |  |  | 23,865 |  |  |  | 21,411 |  |  |  | 86,525 |
Gross profit |  |  | 70,423 |  |  |  | 79,044 |  |  |  | 77,286 |  |  |  | 83,211 |  |  |  | 309,964 |
Operating expense |  |  | 77,615 |  |  |  | 74,116 |  |  |  | 73,147 |  |  |  | 75,831 |  |  |  | 300,709 |
Operating income (loss) |  |  | (7,192 | ) |  |  | 4,928 |  |  |  | 4,139 |  |  |  | 7,380 |  |  |  | 9,255 |
Net income (loss) from continuing operations |  |  | (7,737 | ) |  |  | 4,077 |  |  |  | (788 | ) |  |  | 2,106 |  |  |  | (2,342 | )
Net income (loss) |  | $ | (8,379 | ) |  | $ | 3,572 |  |  | $ | (1,371 | ) |  | $ | 3,369 |  |  | $ | (2,809 | )
Net income (loss) per common share — basic: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) from continuing operations |  | $ | (0.41 | ) |  | $ | 0.22 |  |  | $ | (0.04 | ) |  | $ | 0.11 |  |  | $ | (0.12 | )
Net income (loss) |  | $ | (0.45 | ) |  | $ | 0.19 |  |  | $ | (0.07 | ) |  | $ | 0.18 |  |  | $ | (0.15 | )
Net income (loss) per common share — diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) from continuing operations |  | $ | (0.41 | ) |  | $ | 0.21 |  |  | $ | (0.04 | ) |  | $ | 0.11 |  |  | $ | (0.12 | )
Net income (loss) |  | $ | (0.45 | ) |  | $ | 0.19 |  |  | $ | (0.07 | ) |  | $ | 0.18 |  |  | $ | (0.15 | )

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1570-108306 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e765-108305 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e725-108305 + Details
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