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Selected Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Data | Selected unaudited quarterly financial data for the years 2017 and 2018 are summarized below. The Company has derived this data from the unaudited consolidated interim financial statements that, in the Company's opinion, have been prepared on substantially the same basis as the audited financial statements contained elsewhere in this report and include all normal recurring adjustments necessary for a fair presentation of the financial information for the periods presented. These unaudited quarterly results should be read in conjunction with the financial statements and notes thereto included elsewhere in this report. The operating results in any quarter are not necessarily indicative of the results that may be expected for any future period.
| 2017 |  | 2018
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
| (in thousands, except per share data)
Net sales | $ | 94,505 |  |  | $ | 119,565 |  |  | $ | 262,413 |  |  | $ | 136,628 |  |  | $ | 93,004 |  |  | $ | 105,781 |  |  | $ | 236,699 |  |  | $ | 132,326 |
Gross profit | $ | 30,021 |  |  | $ | 33,719 |  |  | $ | 61,781 |  |  | $ | 30,160 |  |  | $ | 22,959 |  |  | $ | 27,941 |  |  | $ | 64,330 |  |  | $ | 40,486 |
Income (loss) from operations | $ | (15,724 | ) |  | $ | (14,108 | ) |  | $ | (7,746 | ) |  | $ | (26,580 | ) |  | $ | (35,658 | ) |  | $ | (12,140 | ) |  | $ | 20,043 |  |  | $ | (4,418 | )
Income (loss) before provision (benefit) for income taxes | $ | (18,629 | ) |  | $ | (16,371 | ) |  | $ | (16,651 | ) |  | $ | (29,771 | ) |  | $ | (38,529 | ) |  | $ | (16,497 | ) |  | $ | 17,652 |  |  | $ | (2,100 | )
Net income (loss) | $ | (18,285 | ) |  | $ | (16,687 | ) |  | $ | (17,569 | ) |  | $ | (30,487 | ) |  | $ | (36,193 | ) |  | $ | (18,588 | ) |  | $ | 15,699 |  |  | $ | (3,343 | )
Basic earnings (loss) per share | $ | (1.01 | ) |  | $ | (0.77 | ) |  | $ | (0.77 | ) |  | $ | (1.33 | ) |  | $ | (1.57 | ) |  | $ | (0.80 | ) |  | $ | 0.68 |  |  | $ | (0.14 | )
Weighted average shares outstanding | 18,104 |  |  | 21,616 |  |  | 22,772 |  |  | 22,799 |  |  | 23,100 |  |  | 23,106 |  |  | 23,106 |  |  | 23,106 |
Diluted earnings (loss) per share | $ | (1.01 | ) |  | $ | (0.77 | ) |  | $ | (0.77 | ) |  | $ | (1.33 | ) |  | $ | (1.57 | ) |  | $ | (0.80 | ) |  | $ | 0.38 |  |  | $ | (0.14 | )
Weighted average shares and equivalents outstanding | 18,104 |  |  | 21,616 |  |  | 22,772 |  |  | 22,799 |  |  | 23,100 |  |  | 23,106 |  |  | 45,686 |  |  | 23,106 |

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=84173487&loc=d3e1280-108306 + Details
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