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Selected Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2017
Selected Quarterly Financial Data (Unaudited) | Note 20—Selected Quarterly Financial Data (Unaudited) Selected unaudited quarterly financial data for the years 2016 and 2017 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.
|  | 2016 |  |  | 2017 |
|  | First |  |  | Second |  |  | Third |  |  | Fourth |  |  | First |  |  | Second |  |  | Third |  |  | Fourth |
|  | Quarter |  |  | Quarter |  |  | Quarter |  |  | Quarter |  |  | Quarter |  |  | Quarter |  |  | Quarter |  |  | Quarter |
|  | (in thousands, except per share data) |
Net sales |  | $ | 95,809 |  |  | $ | 140,977 |  |  | $ | 302,791 |  |  | $ | 167,026 |  |  | $ | 94,505 |  |  | $ | 119,565 |  |  | $ | 262,413 |  |  | $ | 136,628 |
Gross profit |  | $ | 31,183 |  |  | $ | 44,800 |  |  | $ | 94,933 |  |  | $ | 52,105 |  |  | $ | 30,021 |  |  | $ | 33,719 |  |  | $ | 61,781 |  |  | $ | 30,160 |
Income (loss) from operations |  | $ | (13,816 | ) |  | $ | (1,100 | ) |  | $ | 34,413 |  |  | $ | (2,391 | ) |  | $ | (15,724 | ) |  | $ | (14,108 | ) |  | $ | (7,746 | ) |  | $ | (26,580 | )
Income (loss) before provision (benefit) for income taxes |  | $ | (16,951 | ) |  | $ | (3,441 | ) |  | $ | 31,612 |  |  | $ | (5,844 | ) |  | $ | (18,629 | ) |  | $ | (16,371 | ) |  | $ | (16,651 | ) |  | $ | (29,771 | )
Net income (loss) |  | $ | (17,383 | ) |  | $ | (4,145 | ) |  | $ | 30,529 |  |  | $ | (7,752 | ) |  | $ | (18,825 | ) |  | $ | (16,687 | ) |  | $ | (17,569 | ) |  | $ | (30,487 | )
Basic earnings (loss) per share |  | $ | (1.01 | ) |  | $ | (0.27 | ) |  | $ | 1.91 |  |  | $ | (0.47 | ) |  | $ | (1.01 | ) |  | $ | (.77 | ) |  | $ | (.77 | ) |  | $ | (1.33 | )
Weighted average shares outstanding |  |  | 17,218 |  |  |  | 16,402 |  |  |  | 16,044 |  |  |  | 16,098 |  |  |  | 18,104 |  |  |  | 21,616 |  |  |  | 22,772 |  |  |  | 22,799 |
Diluted earnings (loss) per share |  | $ | (1.01 | ) |  | $ | (0.27 | ) |  | $ | 0.82 |  |  | $ | (0.47 | ) |  | $ | (1.01 | ) |  | $ | (.77 | ) |  | $ | (.77 | ) |  | $ | (1.33 | )
Weighted average shares and equivalents outstanding |  |  | 17,218 |  |  |  | 16,402 |  |  |  | 39,504 |  |  |  | 16,098 |  |  |  | 18,104 |  |  |  | 21,616 |  |  |  | 22,772 |  |  |  | 22,799 |
Quarterly and year-to-date computations of income (loss) per share amounts are made independently. Therefore, the sum of the per-share amounts for the quarters may not agree with the per share amounts for the year.

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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 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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