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Summarized Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Operating Results | The following table presents unaudited quarterly operating results for each of our last eight fiscal quarters. This information has been prepared on a basis consistent with our audited financial statements and includes all adjustments, consisting only of normal recurring adjustments, considered necessary for a fair presentation of the data. Unaudited Quarterly Operating Results
|  | Three Months Ended |
(In thousands, except for per share amounts) |  | March 31, 2019 |  |  | June 30, 2019 |  |  | September 30, 2019 |  |  | December 31, 2019 |
Net sales |  | $ | 143,791 |  |  | $ | 156,391 |  |  | $ | 114,092 |  |  | $ | 115,787 |
Gross profit |  | $ | 60,612 |  |  | $ | 65,015 |  |  | $ | 46,331 |  |  | $ | 47,209 |
Operating income (loss) |  | $ | (6,167 | ) |  | $ | 562 |  |  | $ | (20,288 | ) |  | $ | (14,070 | )
Net income (loss) |  | $ | 770 |  |  | $ | 3,995 |  |  | $ | (46,123 | ) |  | $ | (11,624 | )
Earnings (loss) per common share - basic |  | $ | 0.02 |  |  | $ | 0.08 |  |  | $ | (0.96 | ) |  | $ | (0.25 | )
Earnings (loss) per common share - diluted |  | $ | 0.02 |  | (1) | $ | 0.08 |  | (1) | $ | (0.96 | ) |  | $ | (0.25 | )
|  | Three Months Ended |
(In thousands, except for per share amounts) |  | March 31, 2018 |  |  | June 30, 2018 |  |  | September 30, 2018 |  |  | December 31, 2018 |
Net sales |  | $ | 120,806 |  |  | $ | 128,048 |  |  | $ | 140,335 |  |  | $ | 140,088 |
Gross profit |  | $ | 39,733 |  |  | $ | 49,996 |  |  | $ | 58,448 |  |  | $ | 55,388 |
Operating income (loss) |  | $ | (26,647 | ) |  | $ | (12,813 | ) |  | $ | (2,179 | ) |  | $ | (3,783 | )
Net income (loss) |  | $ | (10,814 | ) |  | $ | (7,670 | ) |  | $ | 7,589 |  |  | $ | (8,447 | )
Earnings (loss) per common share - basic |  | $ | (0.22 | ) |  | $ | (0.16 | ) |  | $ | 0.16 |  |  | $ | (0.18 | )
Earnings (loss) per common share - diluted |  | $ | (0.22 | ) |  | $ | (0.16 | ) |  | $ | 0.16 |  | (1) | $ | (0.18 | )
| (1) | Assumes exercise of dilutive securities calculated under the treasury stock method.

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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=118952077&loc=d3e1280-108306 + Details
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