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Selected Quarterly Financial Information (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
Selected Quarterly Financial Information (unaudited) |
Schedule of unaudited quarterly financial data |
|  | Fiscal 2018 |  | Fiscal 2017
|  | Q1 |  | Q2 |  | Q3 |  | Q4 |  | Q1 |  | Q2 |  | Q3 |  | Q4
|  | (in thousands, except per share amounts)
Net sales |  | $ | 158,574 |  | $ | 157,779 |  | $ | 126,757 |  | $ | 98,972 |  | $ | 94,499 |  | $ | 112,218 |  | $ | 129,308 |  | $ | 139,661
Gross profit |  |  | 56,680 |  |  | 55,395 |  |  | 46,385 |  |  | 35,259 |  |  | 34,500 |  |  | 35,847 |  |  | 50,529 |  |  | 55,352
Net income (loss) |  |  | (15,827) |  |  | (237,634) |  |  | (8,953) |  |  | (144,674) |  |  | 1,640 |  |  | (20,817) |  |  | (23,740) |  |  | (8,479)
Basic income (loss) per common share |  |  | (0.34) |  |  | (5.02) |  |  | (0.19) |  |  | (3.11) |  |  | 0.04 |  |  | (0.49) |  |  | (0.51) |  |  | (0.18)
Diluted income (loss) per common share |  |  | (0.34) |  |  | (5.02) |  |  | (0.19) |  |  | (3.11) |  |  | 0.04 |  |  | (0.49) |  |  | (0.51) |  |  | (0.18)

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109225645&loc=d3e1280-108306 + Details
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