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Selected Quarterly Financial Information (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2020
Selected Quarterly Financial Information (unaudited) |
Schedule of unaudited quarterly financial data | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fiscal 2020 | ​ | Fiscal 2019
​ |  | Q1 |  | Q2 |  | Q3 |  | Q4 |  | Q1 |  | Q2 |  | Q3 |  | Q4
​ | ​ | (in thousands, except per share amounts)
Net sales | ​ | $ | 104,502 | ​ | $ | 98,637 | ​ | $ | 112,078 | ​ | $ | 138,946 | ​ | $ | 99,371 | ​ | $ | 97,822 | ​ | $ | 108,954 | ​ | $ | 113,202
Gross profit | ​ | ​ | 46,419 | ​ | ​ | 41,894 | ​ | ​ | 49,142 | ​ | ​ | 56,845 | ​ | ​ | 34,716 | ​ | ​ | 36,285 | ​ | ​ | 42,223 | ​ | ​ | 44,970
Net income (loss) | ​ | ​ | (567) | ​ | ​ | (8,302) | ​ | ​ | 580 | ​ | ​ | (102) | ​ | ​ | (18,530) | ​ | ​ | (15,565) | ​ | ​ | (11,767) | ​ | ​ | (32,871)
Basic income (loss) per common share | ​ | ​ | (0.01) | ​ | ​ | (0.17) | ​ | ​ | 0.01 | ​ | ​ | (0.00) | ​ | ​ | (0.40) | ​ | ​ | (0.33) | ​ | ​ | (0.25) | ​ | ​ | (0.69)
Diluted income (loss) per common share | ​ | ​ | (0.01) | ​ | ​ | (0.17) | ​ | ​ | 0.01 | ​ | ​ | (0.00) | ​ | ​ | (0.40) | ​ | ​ | (0.33) | ​ | ​ | (0.25) | ​ | ​ | (0.69)

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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=121640914&loc=d3e1280-108306 + Details
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